Zellweger MINIGAS MK5 Operating Instructions Manual Download Page 83

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MAN0585.P65

Issue 01 - 11/99

2987M5023

6. CALIBRATING THE MINIGAS MK5

(4)

Having set all channels to the appropriate expected test
gas concentration, the final press on the calibration button
returns the Minigas Mk5 to the Put <> GAS screens.

(5)

Continue with span calibration from operation (4) in
Section 6.4.4.

Summary of Contents for MINIGAS MK5

Page 1: ...operating instructions MINIGAS MK5 MULTIPLE DISPLAY 4 IN 1 GAS MONITOR MAN0585 PM6 Issue 01 11 99 2987M5023 ...

Page 2: ... a manufacturer who holds an appropriate EECS licence we BASEEFA can offer no assurance with regard to the quality of the work done The following warning applicable to intrinsically safe instruments was issued by CoGDEM in October 1992 CoGDEM THE COUNCIL OF GAS DETECTION EQUIPMENT MANUFACTURERS WARNING This is a certified product Service repair or calibration other than by the manufacturer or a ma...

Page 3: ...anual must be read and fully understood before servicing the Minigas Mk5 Note Failure to observe and abide by the above Warnings and Cautions may render the intrinsic safety approval void and may remove any right of claim against Zellweger relating to product liability or consequential damage to any third party CAUTION The following gases or substances may contaminate the explosive gas sensor pell...

Page 4: ...dous High off scale readings may indicate an explosive concentration Only the combustible gas detection portion of this instrument has been assessed for performance After a high concentration reading carry out a recalibration check see Chapter 6 HELP US TO HELP YOU Every effort has been made to ensure the accuracy in the contents of our documents however Zellweger Analytics Limited can assume no r...

Page 5: ...nalytics Limited Actioned By Date Response Date I suggest the following corrections changes be made to Section To Marketing Communications Zellweger Analytics Limited Hatch Pond House 4 Stinsford Road Nuffield Estate POOLE Dorset BH17 0RZ United Kingdom Tel 44 0 1202 676161 Fax 44 0 1202 678011 email markcom zellweger analytics co uk From Address Tel Fax email HELP US TO HELP YOU ...

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Page 7: ...2 4 1 Start up sequence 21 2 4 2 Displaying the instrument serial number 23 2 4 3 Datalogging warnings 23 2 4 4 If countdown stopwatch alarm is configured 24 2 5 Switching off 26 2 6 Display backlight 26 2 7 Display mode 27 2 7 1 General 27 2 7 2 Display screens 27 2 7 3 If countdown stopwatch alarm is configured 29 2 7 4 Time of day display 30 2 8 Zero setting 31 2 8 1 Checking zero readings 31 2...

Page 8: ...battery indication 41 2 18 1 Low battery indications 41 2 18 2 Battery voltage indication 42 3 USE AND TRANSFERRING DATA AFTER USE 45 3 1 Introduction 45 3 2 Confined space entry 46 3 2 1 Initial area check 46 3 2 2 Confined space entry checks 46 3 2 3 Adsorption of toxic gases 47 3 3 Normal use of the Minigas Mk5 48 3 4 Area monitoring 49 3 5 Storage of the Minigas Mk5 49 3 6 Data transfer after ...

Page 9: ...roduction 63 5 1 1 General 63 5 1 2 Field settable alarms 63 5 2 Changing alarm levels 64 5 2 1 General 64 5 2 2 Entering field settable alarm mode 64 5 2 3 Oxygen alarms 65 5 2 4 Explosive alarms 66 5 2 5 Toxic alarms 67 5 2 6 Conclusion 70 5 3 Indication of user configuration 70 6 CALIBRATING THE MINIGAS MK5 71 6 1 Introduction 71 6 1 1 General 71 6 1 2 EasyCal calibration method 71 6 2 Tools an...

Page 10: ...ng gas bottle concentrations 82 7 SPECIFICATIONS 85 7 1 Minigas Mk5 specification 85 7 2 Battery charger specification 90 7 3 Toxic sensor cross sensitivity 91 8 OPTIONAL ACCESSORIES AND SPARES 93 APPENDICES A Glossary of Terms and Abbreviations 97 TABLES 1 Minigas Mk5 alarm signal bleep patterns 38 2 Minigas Mk5 warning codes 40 3 Minigas Mk5 fault codes 43 FIGURES 1 Display screen selection sequ...

Page 11: ...nsors for detecting oxygen explosive gases and two toxic gases selected from the five currently available toxic gas sensors If required it can be configured for monitoring only one two or three of these gases Note Throughout this manual it is assumed that the Minigas Mk5 is fully equipped with all four sensors References to sensors not fitted in the user s instrument should be ignored The two toxi...

Page 12: ...ations of the four gases and their associated peak readings The Minigas Mk5 also produces short term STEL and long term LTEL indications of toxic gas exposures an optional STEL reading for explosive gas exposure and an elapsed time since switch on display Data logging facility is available as standard This enables up to approximately 40 hours of exposure data to be stored either as a fixed log whe...

Page 13: ...ompatible with each other for example the AutoZero and Standby mode options are not available with Go NoGo instruments A Minigas Questionnaire part no 006 0386 01 is available to assist Zellweger Analytics distributors and their customers in defining the Minigas Mk5 configuration that is software options alarm levels etc to suit particular user requirements Note Modifying Minigas Mk5 instruments t...

Page 14: ...n 2 15 3 Disable Dual Tone As the Enable Warning Alarm Bleep but also Alarm Bleep with all other gas dual tone alarms changed to single tone see Section 2 15 3 Alarm Jump Under alarm conditions the instrument immediately displays the appropriate measurement If more than one alarm occurs it shows the screen with the highest priority alarm Alarm Cancel Allows the alarm signal on the displayed screen...

Page 15: ...o Low Battery it must be acknowledged This ensures that the user is fully aware that the battery pack is becoming exhausted see Section 2 18 Battery Voltage Additional Display Mode screen for checking Indication the battery pack voltage see Section 2 18 2 Standby Mode Battery preserving facility In particular saves power used by the explosive gas sensor see Section 2 12 Autorotate The display cont...

Page 16: ... the hazardous condition clears Long STEL ART Allows nuisance STEL alarms to be removed by extending the STEL ART after cancelling to equal the STEL period normally 15 minutes However if the STEL level becomes safe and then hazardous again within the cancel period the alarm repeats Non latching Display backlight is switched on for only ten Backlight seconds when the red button is pressed see Secti...

Page 17: ...For example lone workers in confined spaces may be required to establish regular contact with their control centre in order to confirm their safety see Section 2 4 4 Language Displays and front panel label are either in English French or German H2 S Warning Displays a warning message to indicate that the flammable sensor needs re calibrating if the H2 S concentration has exceeded100 ppm Only avail...

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Page 19: ...ed in the working environment are provided in Section 3 References are made in this chapter to optional facilities which may or may not be configured in the user s instrument To avoid confusion these are always referred to as software options further details of which will be found in Section 1 4 Some of the operations described in this section include instructions to apply short medium or long dur...

Page 20: ...xic 1 gas three characters Lower right Toxic 2 gas three characters The particular gas to which the concentration refers is printed as a fixed legend on the front panel label adjacent to the display To the left of the display are four arrows These arrows are used to indicate the information that is being displayed for all sensors by pointing to the appropriate fixed legend on the front panel label...

Page 21: ...iMH battery pack or recharge the battery pack fitted In the case of the dry cell version replace all four of the AA cells Refer to Section 4 for details 2 4 SWITCHING ON 2 4 1 Start up Sequence 1 The start up sequence is initiated by pressing and releasing the I O button on the left hand side of the Minigas Mk5 2 The backlight is illuminated and the Minigas Mk5 displays the first start up screen c...

Page 22: ...ys that for the oldest sensor s 4 After six seconds LOG is displayed in the upper right bank If the instrument log contains details of specific events having occurred on any of the channels then the appropriate characters for example O F C etc are displayed in the lower two banks A dash indicates no event In the case of a fixed log configuration a low arrow is displayed if the log is more than hal...

Page 23: ...display banks and is read in the conventional order upper left upper right lower left lower right The serial number is displayed for eight seconds or for as long as the O button is held depressed 5 Release the O button and the Minigas Mk5 proceeds with the start up and self test sequence 2 4 3 Datalogging Warnings One of the requirements of the datalogging facility is that it should be transparent...

Page 24: ...dates and times To achieve this datalogging instruments contain a clock calendar device which is supported by a small back up battery If this back up power is interrupted a warning is given by SEt rtc appearing in the upper two banks Continuing to use the Minigas Mk5 after overriding this warning will result in incorrect dates and times being recorded in the data log Use the LogView Datalogging So...

Page 25: ...een displayed and the hours field flashing press the I O button to increment the hours setting in 1 hour steps up to 23 maximum After 23 the setting returns to 00 If the I O button is held depressed the setting automatically increases at a rate of eight steps per second If no alterations are made for 10 seconds the Minigas Mk5 changes to Display Mode 2 Press the O button to accept the hours settin...

Page 26: ...repeat the setting procedure Note The Countdown Stopwatch Alarm may be disabled by setting the timer duration to zero hours and zero minutes 2 5 SWITCHING OFF The Minigas Mk5 is switched off as follows 1 Press and hold both buttons the order of pressing the buttons is unimportant 2 Wait for OFF to be displayed and then release both buttons 2 6 DISPLAY BACKLIGHT The display backlight can be turned ...

Page 27: ...ls e Elapsed time since switch on Apply short or medium presses on the I O button to move in sequence from one screen to another see the flow diagram Figure 1 If a particular sensor is not fitted its display bank on the screen remains blank Similarly if the peak value option is not specified the associated screen is not displayed Details of all software options will be found in Section 1 4 2 7 2 D...

Page 28: ...arrow highlighted readings C Explosive toxic STEL short term exposure level Display The STEL arrow is highlighted The time weighted averages for the explosive and toxic gases over a 15 minute reference period are indicated Refer to the Glossary appendix for a description of the term STEL START AUTOZERO Explosive and Toxic AutoSpan Oxygen INST Instantaneous Exposure Display PEAK RESET PEAK P Peak D...

Page 29: ...ours figures in the lower left bank and the minutes figures in the lower right bank Other screens are available in Display Mode as software options a Countdown Stopwatch Alarm see Section 2 7 4 b Time of Day Display see Section 2 7 4 c Battery Voltage Indication see Section 2 18 1 2 7 3 If Countdown Stopwatch Alarm is Configured 2 7 3 1 Countdown Time Remaining If the Countdown Stopwatch Alarm opt...

Page 30: ... Go screen is displayed the hours and minutes fields are both flashing 00 when the alarm sounds 1 Cancel the alarm by pressing the I O button 2 When the alarm is cancelled the countdown timer is automatically reset to the timer duration see Changing the timer duration in Section 2 4 4 and the alarm countdown is restarted 2 7 4 Time of day Display If the Time of Day software option available only w...

Page 31: ...software option are not available on Go NoGo instruments see Section 2 11 2 8 2 AutoZero Facility WARNING As there is an appreciable variable concentration of CO2 in clean air the autozero function must not be used on instruments fitted with carbon dioxide sensors The flow diagram Figure 1 shows an AutoZero Autospan box If the AutoZero software option is enabled the instantaneous gas readings can ...

Page 32: ...ppm Hydrogen sulphide 7 to 4ppm Chlorine 1 0 to 0 5ppm Sulphur dioxide 2 0 to 2 0ppm Carbon dioxide 0 1 to 0 1 VOL If a reading has drifted too far from its zero point then the Minigas Mk5 will not AutoZero that reading but will give an error bleep see Section 2 18 If this occurs first ensure that the instrument is monitoring clean fresh air and try to AutoZero again If it is still not possible to...

Page 33: ...nt Watchdog Facility A software option is available allowing the watchdog signal to be muted that is visible only 1 In the Display Mode apply short or medium presses to the I O button to step through to the elapsed time screen 2 Apply a medium press to the O button to obtain the bLEEP y n prompt screen 3 Press the O button no to mute the watchdog bleep and return to the elapsed time screen To reve...

Page 34: ...LTEL arrow is highlighted Note The AutoZero Autorotate and Standby Mode options are not available with Go NoGo instruments 2 12 STANDBY MODE The Standby Mode is a software option that allows the user to take breaks without losing the peak values or corrupting the accumulation of data for LTEL and STEL calculations It also conserves battery power approximately halving power consumption while in thi...

Page 35: ... screen If an alarm occurs the display jumps to the relevant screen and stays there until the alarm is cancelled Pressing the I O button suspends the Autorotate scrolling action for 10 seconds 2 14 THE DATALOGGING FACILITY The datalogging facility enables typically 40 hours of exposure data to be stored either as a fixed log logging stops when the log store is full or as a rotating log logging con...

Page 36: ...d alarm arrow s are highlighted to indicate a high very high explosive and toxic only or low oxygen only gas concentration The instantaneous screen is able to display four gas concentration alarms simultaneously For STEL and LTEL alarms the explosive or toxic gas reading flashes and the high alarm arrow is highlighted If for any reason an alarm s exposure level is not displayed on the current scre...

Page 37: ...rious Minigas Mk5 bleep patterns are defined in Table 1 as a series of bleep pause phases of specified duration where HiXXXms is a high tone 2560Hz bleep for XXX milliseconds Lo XXXms is a low tone 2104Hz bleep for XXX milliseconds pause XXXms is a silent pause of XXX milliseconds The volume of the various alarm and signal bleeps is specified in Table 1 2 15 4 Alarm Cancelling If the Alarm Cancel ...

Page 38: ...with low Hi 16ms pause 500ms Hi 125ms Half Red battery repeated every 10s Watchdog with low Hi 16ms pause 500ms Hi 16ms Half Red battery and an pause 500ms Hi 125ms alarm cancelled repeated every 10s Timer countdown Hi 63ms pause 1000ms repeat Full Red alarm Danger alarm all Hi 125ms pause 16ms Full Red gases standard Lo 125ms pause 16ms repeat config and software option 1 Explosive and toxic Hi 6...

Page 39: ...Table 1 to indicate that the Minigas Mk5 has registered at least one hazard during the current period of use 2 15 5 Alarm Priority If the Minigas Mk5 detects two or more hazards simultaneously the display jumps to the screen with the greatest priority assuming the Alarm Jump option is configured Similarly alarms are cancelled in the same order of priority Minigas Mk5 priorities are normally config...

Page 40: ...dry cell Replace recharge the batteries FLt bAt Battery exhausted Switch off Replace recharge the batteries Table 2 Minigas Mk5 Warning Codes 2 16 INSTRUMENT WARNINGS AND FAULTS The Minigas Mk5 incorporates a continuous self checking facility to monitor the correct functioning of the instrument The most common fault that is likely to occur is an exhausted battery for which a warning indication is ...

Page 41: ...output voltage first starts to fall the message bAt is displayed and the watchdog signal changes to a double bleep with the red lights flashing see Table 1 After two seconds the Minigas Mk5 display reverts to its previous mode but the warning recurs every 10 seconds until either the instrument is switched off or an alarm fault occurs However if the Forced Response to Low Battery software option is...

Page 42: ... for as long as the I O button is pressed If this happens the battery must be replaced or recharged 2 18 2 Battery Voltage Indication If the Battery Voltage software option is enabled the battery pack on load voltage may be checked in Display Mode by applying short or medium presses to the I O button to step through to the bAt screen The voltage to one decimal place for example 4 9 is then indicat...

Page 43: ...605 indicate a or pellistor faulty toxic sensor 610 or 620 indicate a faulty not for CO2 pellistor Return the instrument to Zellweger Analytics for servicing 800 series EEPROM write error or 800 indicates the datalogging component missing configuration EEPROM and 810 the logging EPROM 820 indicates the logging SRAM not fitted Return the instrument to Zellweger Analytics for servicing Switching on ...

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Page 45: ...ecalibrated if necessary The procedures and cautions detailed in the CSA and SAA Approval Addendum on page vi of this manual must be observed when using the Minigas Mk5 in North America or Australia 3 1 INTRODUCTION The Minigas Mk5 personal multi gas monitor is intended to be carried or worn by the user at all times whilst in an environment with a potentially hazardous atmosphere However there are...

Page 46: ...s and refer to supervisory personnel for instructions 3 2 2 Confined Space Entry Checks After the initial area checks have given safe results the confined space entry checks can be made Remove the entrance cover and take a sample of the atmosphere within the confined space using either of the following methods a Attach a lanyard or rope to the Minigas Mk5 and lower it into the confined space Remov...

Page 47: ...itted and enter the work area ensuring that the Minigas Mk5 is worn with the sensor grill facing outwards towards the breathing zone 3 2 3 Adsorption of Toxic Gases Instead of passing freely along rubber tubing molecules of certain gases can stick onto the tubing wall thereby reducing their concentration at the end of the tubing This effect is known as adsorption and is most noticeable with chlori...

Page 48: ...n and worn as close to the breathing area as possible To this end accessories are available to allow the instrument to be worn in a number of different ways refer to Section 8 for a list of these accessories CAUTION DO NOT remove the protruding harness fixing screws on the back of the Minigas Mk5 In addition to providing locating points for the harness belts they hold together the front and back c...

Page 49: ...Safe T Cube which then monitors the alarm output of the Minigas Mk5 and provides high level audible and visual alarm indications The unit is self powered by an integral rechargeable battery and if no alarms occur is capable of operating for a minimum of 100 hours between charges 3 5 STORAGE OF THE MINIGAS MK5 CAUTION If a dry cell Minigas Mk5 is to be placed in storage for long periods the cells M...

Page 50: ...connected to a suitable Data Transfer Unit WARNING The data transfer equipment including the computer must not be used in a hazardous or potentially dangerous area Note If the computer displays messages or instructions different to those detailed below refer to supervisory personnel or to the LogView Datalogging Software User Manual provided as part of the LogView software interface kit 1 Ensure t...

Page 51: ...on the Minigas Mk5 by pressing and releasing the I O button in the usual manner 5 Press the RETURN key on the computer keyboard to start the transfer operation this key is sometimes marked as ENTER or Alternatively use the mouse to click on the computer display START command button 6 The computer displays the message Trying to Connect With Gas Monitor followed by Log Transfer in Progress While dat...

Page 52: ...s Mk5 is switched off automatically at the end of the data transfer If for any reason this does not happen switch off the Minigas Mk5 by pressing and holding the I O and O buttons until OFF is displayed on the instrument 8 Remove the Minigas Mk5 from the Data Transfer Unit and refit its battery pack ...

Page 53: ...out possibly at prescribed intervals to ensure the continuing correct operation of the instrument In the case of the Minigas Mk5 these actions are as follows 1 Ensure that the exterior is clean dry and free of corrosive contaminants after use If the exterior becomes dirty wipe with a cloth moistened with a mild detergent Allow to dry before using the Minigas Mk5 Taking care not to damage the white...

Page 54: ...nces that are detrimental to the pellistor These checks are also necessary if the Minigas Mk5 has been used in an environment involving extremes of dirt liquid contaminants or higher than normal concentrations of toxic gas A gas response check consists essentially of applying a test gas or gas mixture to the instrumentandensuringthatitrespondswiththeappropriate alarm s and or gives readings of acc...

Page 55: ...d the battery pack in the other Using the thumb and first finger of the hand holding the battery pack depress the two spring loaded studs locking the battery pack to the instrument and then pull the battery pack away from the instrument 3 To fit the battery pack to the Minigas Mk5 ensure that the electrical contacts between the battery pack and the instrument are in line then hold both spring load...

Page 56: ...pt to remove the cells from the pack as this will invalidate the safety certification and the Zellweger Analytics warranty Two types of battery charger see Section 8 are available for recharging the Minigas Mk5 NiMH batteries a fast charger Section 4 3 2 and a trickle charger Section 4 3 3 4 3 2 Fast Charger The fast charger provides two charging levels fast and trickle with an automatic changeove...

Page 57: ...harge and therefore requires a further two hours on trickle charge to reach full capacity for a total of five hours 4 3 3 Trickle Charger When a battery pack is inserted into a trickle charger the charger displays both green lights to show that the battery is being charged A discharged battery is fully charged after a maximum of 19 hours although it is safe to leave it on charge for longer periods...

Page 58: ...nly be located in the charger in one orientation see Figure 2 Normally the weight of the battery pack is sufficient to ensure a good electrical contact between the battery pack and the charger 4 The charging light illuminates as soon as a good contact is made If the light does not illuminate check that the contacts are clean and then try again 5 Remove the battery pack from the charger when the ba...

Page 59: ...only zinc chloride or zinc carbon batteries to be used are as follows Ever Ready R6S Silver Seal Ever Ready 1215 Super Heavy Duty Vidor R6HP Rayovac 5AA Panasonic UM3 or UCAR 1215 The only alkaline batteries to be used with the Minigas Mk5 are as follows Rayovac 815 Duracell MN1500 or Ever Ready LR6 E91 Energiser 1 Ensure that the Minigas Mk5 is switched off and then remove the battery pack Sectio...

Page 60: ...ion 4 2 4 5 SENSOR GRILL FILTER REPLACEMENT Underneath the sensor grill is a Goretex filter for preventing contaminants reaching the sensors refer to Figure 3 This filter should be replaced when it becomes noticeably discoloured from white Refer to Section 8 for ordering details CAUTION A stainless steel filter not Goretex must be used on instruments with a chlorine gas sensor fitted A stainless s...

Page 61: ...o place the sensor grill face downward with the Neoprene seal inside it and the clean filter smooth side against the Neoprene seal on top of the seal Then place the Minigas Mk5 instrument onto the sensor grill not vice versa and turn the two items over together For instruments fitted with a chlorine sensor fit only a stainless steel filter 4 6 SERVICE Zellweger Analytics offers calibration and rep...

Page 62: ... problem including the instrument Serial Number and details of any displayed fault messages 3 Forward the instrument according to the shipping instructions with shipping prepaid 4 The time required for servicing a Minigas Mk5 depends on whether the instrument is returned to a Zellweger Analytics Service Centre or if it can be repaired or replaced locally Note For instrument returns in the UK or No...

Page 63: ...nt alarm trigger levels and allowing adjustments to be made to them by means of the buttons I O O and calibration on the Minigas Mk5 5 1 2 Field Settable Alarms The following alarm trigger levels can be adjusted through this mode a Oxygen instantaneous low and high alarms b Explosive instantaneous high and very high alarms c Toxic 1 and toxic 2 instantaneous high and very high STEL and LTEL alarms...

Page 64: ...2 CHANGING ALARM LEVELS 5 2 1 General Some of the prompt screens in the following procedures present the operator with a yes no option y or n Press the I O button for Yes or the O button for No Having obtained the appropriate screen the alarm levels are adjusted by means of the I O increase and O decrease buttons Pressing both buttons simultaneously disables the selected alarm 5 2 2 Entering Field...

Page 65: ...on depressed while switching on the Minigas Mk5 ie while pressing and releasing the I O button The AdJ AL screen is then displayed 4 Select No to return to the normal start up sequence or Yes to continue with the alarm setting adjustments 5 2 3 Oxygen Alarms 1 Obtain the AdJ AL screen see Section 5 2 2 and select Yes to obtain the AdJ O screen 2 Select Yes to obtain the O Lo screen indicating the ...

Page 66: ... gas screen If no further adjustments are to be made to the alarm settings keep selecting No to step through the subsequent screens until the End screen is displayed 5 Select Yes to exit Field Settable Alarm mode and return to the start up sequence or No to return to the AdJ O screen to allow further adjustments or checks to be made 5 2 4 Explosive Alarms 1 Obtain the AdJ O screen see Section 5 2 ...

Page 67: ...ake the required changes to the explosive very high alarm setting and then press the calibration button to obtain the toxic 1 AdJ screen If no further adjustments are to be made to the alarm settings keep selecting No to step through the subsequent screens until the End screen is displayed 5 Select Yes to exit Field Settable Alarm mode and return to the start up sequence or No to return to the AdJ...

Page 68: ...sting the explosive very high alarm setting It is assumed here as an example that the Toxic 1 alarms are to be adjusted However the procedure is the same for both channels 2 Select Yes to obtain the C Hi screen indicating the current Toxic 1 instantaneous high alarm trigger level 3 Make the required changes to the Toxic 1 high alarm setting and then press the calibration button to step on to the C...

Page 69: ...e the required changes to theToxic 1 LTEL alarm setting and then press the calibration button to obtain the AdJ H Toxic 2 screen If no changes are to be made to the Toxic 2 alarm settings select No to obtain the End screen If changes are to be made to the toxic 2 alarm settings select Yes to obtain the H Hi screen and repeat operations 3 to 6 In this case the End screen appears after the final pre...

Page 70: ...alibration button anti tamper screw and washer 5 3 INDICATION OF USER CONFIGURATION Once the alarm settings have been changed from the factory configuration settings the Minigas Mk5 will display USr as the configuration code at start up This replaces the previous factory code for example A02 5 FIELD SETTABLE ALARM MODE ...

Page 71: ...rument Testing Calibration is the process of applying known concentrations of gas to the Minigas Mk5 and if necessary making adjustments to bring its performance within specification Testing consists of applying a gas or gas mixture to the instrument and ensuring that it responds with the appropriate alarm s and or gives readings of acceptable accuracy Tests of this nature are generally referred t...

Page 72: ...ntained in cylinders fitted with a low flow gas regulator 500ml min for chlorine 300ml min for all other gases Zellweger Analytics can supply suitable calibration gases in disposable cylinders refer to Section 8 for part numbers Methane 1 to 1 5 VOL or 20 to 30 LEL in air NOT in nitrogen Carbon monoxide 350 to 600ppm in air or nitrogen Hydrogen sulphide 65 to 90ppm in nitrogen Chlorine 30ppm in ni...

Page 73: ...ing and the appropriate low flow regulator refer to Section 8 for part numbers 6 3 PREPARATION FOR CALIBRATION WARNING The test gases are vented to atmosphere during the following purging and calibration procedures Ensure adequate ventilation or use a fume cupboard 6 3 1 General Calibration must take place in a clean fresh air environment at an ambient temperature of between 20 and 25 C 68 to 77 F...

Page 74: ...t the adsorption effect on hydrogen sulphide is aggravated and the resulting reduction in concentration could be as high as 5 or 6ppm metre WARNING PTFE tubing MUST be used for chlorine or sulphur dioxide test gas rubber is NOT suitable If it is suspected that the tubing is wet it should be dried by hanging vertically with both ends pointing downwards for at least 24 hours DO NOT attempt to dry it...

Page 75: ...rine and sulphur dioxide allow the test gas to purge the tubing and connections for two minutes For chlorine and sulphur dioxide purge for 10 minutes although a longer purge time may be necessary if the PTFE connecting tubing is more than about 150mm 6in in length 4 Turn off the gas cylinder 6 4 CALIBRATION PROCEDURES 6 4 1 General The following procedures include instructions to apply short mediu...

Page 76: ...t or medium press to the internal calibration button to enter EasyCal mode Applying a long press to the button will cause the Minigas Mk5 to enter Manual Calibration Mode In this event escape by applying another long press to the button to return the instrument to instantaneous display 4 Proceed with zero calibration 6 4 3 Simultaneous Zeroing WARNING For instruments fitted with a carbon dioxide s...

Page 77: ... do GAS screen is displayed This is a prompt to apply a calibration gas or gas mixture for any of the fitted sensor channels If it was necessary only to zero the Minigas Mk5 readings select No to return to the normal instantaneous display Otherwise continue with span calibration 6 4 4 Span Calibration Before proceeding with span calibration ensure that the gas connections have been purged as per t...

Page 78: ...the Put GAS screens and continue with span calibration 4 Having confirmed that the expected gas concentrations agree with the known test gas concentrations fit the calibration hood to the Minigas Mk5 and turn on the test gas cylinder From this point on span calibration of the toxic and explosive channels is fully automatic and requires no adjustments or timing on the part of the operator By monito...

Page 79: ... gas Otherwise select No to return to the SPA gassing in progress screen Note The End GAS screen will time out after 4 seconds and return to the gassing in progress screen 6 When the Minigas Mk5 has been able to set the span for the respective channels the screen indicates the sensor that has been calibrated and the gas concentration that it has been spanned to For example the following illustrati...

Page 80: ...larm condition and with a datalogging instrument record a false alarm report 6 4 5 Calibration Failure In the event of the failure to zero the toxic and explosive channels or span the oxygen channel or span the toxic and explosive channels then after the relevant stage zeroing or spanning the Minigas Mk5 sounds an error bleep and a bAd screen is displayed For example the following illustration sho...

Page 81: ...check for contamination of the atmosphere surrounding the instrument during the calibration procedure If there is a calibration failure and having ensured that there is no obvious external cause the sensor should be replaced Instructions for replacing any sensor will be found in the Minigas Mk5 Service Manual Alternatively the instrument can be returned to Zellweger or an Authorised Distributor fo...

Page 82: ...t GAS screens then the expected values must be reset as follows 1 With the Put GAS screens displayed press the internal calibration button to obtain the first of the GAS bot screens 2 Adjust the expected concentration value appearing in the lower right section of the screen by means of the I O increase and O decrease buttons until the screen reads the same as the value certified on the gas cylinde...

Page 83: ...ING THE MINIGAS MK5 4 Having set all channels to the appropriate expected test gas concentration the final press on the calibration button returns the Minigas Mk5 to the Put GAS screens 5 Continue with span calibration from operation 4 in Section 6 4 4 ...

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Page 85: ...937 g 33 0 oz rechargeable zinc 7 1 2 Power Supplies Power supply Rechargeable NiMH or dry cell 4 x AA battery pack WARNING Never attempt to change dry cell batteries in a hazardous or potentially dangerous area Use only those alkaline batteries listed below The use of any other type of battery will render the intrinsic safety approval of the unit void Although not recommended if zinc chloride or ...

Page 86: ...68 F 50 C 122 F Rechargeable NiMH 19 hours 21 hours 21 hours Dry cell alkaline 7 hours 46 hours 51 hours 7 1 3 Range and Resolution The Minigas Mk5 monitors the atmospheric concentration of oxygen two toxic gases selected from carbon monoxide hydrogen sulphide chlorine sulphur dioxide and carbon dioxide and an explosive gas with the following ranges and resolutions Note 1 Although the Minigas Mk5 ...

Page 87: ... 3 VOLO2 intherange18 to24 VOL Carbon monoxide 5ppm at 100ppm Hydrogen sulphide 5ppm at 50ppm Chlorine 0 5ppm at 5ppm Sulphur dioxide 1ppm at 20ppm Explosive 3 LEL below 50 LEL 5 LEL above 50 LEL Carbon dioxide 0 2 V V 90 Response Rise Times Oxygen 10 seconds typical Carbon monoxide 10 seconds typical Hydrogen sulphide 10 seconds typical Chlorine 180 seconds typical Sulphur dioxide 45 seconds typi...

Page 88: ...ws the user to change certain of the factory set alarm points UK USA Oxygen INST Deficiency 19 Deficiency 19 5 Enrichment 23 Enrichment 23 5 Explosive INST 20 LEL 10 LEL methane in air methane in air Toxic INST CO 400ppm CO 200ppm H2 S 40ppm H2 S 20ppm Cl2 5ppm Cl2 5ppm SO2 10ppm SO2 8ppm CO2 0 5 VOL CO2 2 0 VOL Toxic STEL 15min CO 200ppm CO 100ppm H2 S 15ppm H2 S 15ppm Cl2 2ppm Cl2 2ppm SO2 5ppm ...

Page 89: ...sing Note The use of the Minigas Mk5 in hazardous areas is limited to 40 C Storage of the Minigas Mk5 with its sensors fitted should be limited to the temperature range 0 C to 25 C 7 1 8 Intrinsic Safety Certification Intrinsic safety approval to Ex ias IIC T4 T3 or equivalent has been granted to the Minigas Mk5 Authority Certificate Number Code BASEEFA UK Ex 93Y2379X Ex ias IIC T4 T3 Ex 95C2440X ...

Page 90: ... Declaration of Conformity to the Requirements of EMC Directive 89 336 EEC Equipment covered Neotronics Minigas Mk5 instruments all variants Neotronics Minigas chargers all variants Neotronics Minigas Data Transfer Unit Neotronics Minigas pump battery Neotronics Universal charger Standards applied Emissions EN55 022 1995 Class B Immunity EN55 082 2 1995 EN50 082 1 1992 Minigas Data Transfer Unit o...

Page 91: ...C 32 F to 104 F storage 20 Cto 50 C 4 Fto 122 F Humidity operating and storage 0 to 99 rh 7 3 TOXIC SENSOR CROSS SENSITIVITY Toxic sensors are designed specifically for one gas however they also respond to a greater or lesser extent to other gases This effect known as cross sensitivity is shown in the table below which gives typical Minigas Mk5 readings obtained when a sensor is exposed to an othe...

Page 92: ...ruments are NOT suitable for use in atmospheres having a significant concentration of nitrogen dioxide 7 SPECIFICATIONS Gas Applied Toxic Sensor Response ppm v v 10ppm unless Carbon Hydrogen Chlorine Sulphur Carbon otherwise stated Monoxide Sulphide Dioxide Dioxide Carbon monoxide 10 1 0 0 3 0 Hydrogen sulphide 0 10 20 50 0 Methane 1 VOL 0 0 0 0 0 Hydrogen 3 0 0 0 0 Nitric oxide 0 0 NT NT 0 Nitrog...

Page 93: ...MC F110 00 One way 100V to 120V 60Hz USA plug PMC F110 4W Four way 100V to 120V 60Hz USA plug PMC F012 00 One way 12V to 16V dc b Trickle Charge Battery Charger PMC T240 00 One way 200V to 260V 50Hz UK plug PMC T220 00 One way 200V to 260V 50 60Hz European plug PMC T110 00 One way 100V to 120V 60Hz USA plug PMC T024 00 One way 24V to 32V dc PMC T012 00 One way 12V to 16V dc c Spare Dry cell Batter...

Page 94: ...0717 00 5 metre Clips onto the Minigas Mk5 grill This item is NOT suitable for sampling chlorine gas g Aspirator Hose Extension P300 0727 00 10 metre h Ball Float P088 0341 00 Ball Float Clips onto the end of the aspirator hose see f so that if it is accidentally lowered into water the aspirator hose remains above the surface j Safe T Cube P300 1738 00 Safe T Cube Enables the Minigas Mk5 to be use...

Page 95: ...ITMGAS 00 All gases except chlorine PGAS KITMGAS C Chlorine only m Calibration Gas Cylinders Contact Zellweger Analytics or their local agent for details n Aspirator Plate Calibration Hood P325 9374 00 Aspirator Plate Calibration Hood p Sensor Grill Filters P325 9992 00 Goretex Consumable items supplied in packets of 10 Not suitable for chlorine gas instruments P045 0038 00 Stainless Steel Consuma...

Page 96: ...Accessories Carrying Case r LogView Software Interface Kit For use with datalogging instruments and includes the LogView software discs a User Manual User Card Data Transfer Unit and a cable to connect the Data Transfer Unit to an IBM compatible PC P325 9956 01 Windows version UK P325 9956 00 Windows version USA 8 OPTIONAL ACCESSORIES AND SPARES ...

Page 97: ...mospheres bAt Battery warning Bleep Momentary sound from the audible alarm CAL dUE Date when instrument is due for periodic calibration CCC Pellistor temperature compensation coefficient CENELEC European Committee for Electrotechnical Standardisation CH4 Methane Cl2 Chlorine CO Carbon monoxide CO2 Carbon dioxide CSA Canadian Standards Association Data Transfer Unit Hardware used for downloading lo...

Page 98: ...log any more data until the current data has been downloaded LogView Software package used for downloading logged data Long press Press and keep pressed for three bleeps then release LTEL Long Term Exposure Level a measurement of the mean intake by inhalation over one or more work shifts normally taken over an 8 hour reference period For example exposure to 8ppm for 4 hours followed by 0ppm for 4 ...

Page 99: ... Mk5 internal clock calendar needs to be reset Short press Press and keep pressed for one bleep only then release SIRA IS certification authority SO2 Sulphur dioxide SPA Span measurement Calibration mode SP2 Second higher span reading STEL Short Term Exposure Level a measurement of the mean intake by inhalation after a brief exposure normally taken over a 15 minute reference period For example exp...

Page 100: ... range UL Underwriters Laboratories Inc VOL Percentage of the total volume Watchdog Audible and visual confidence check repeated at 10 second intervals C Toxic sensor carbon monoxide d Toxic sensor carbon dioxide F Explosive sensor pellistor H Toxic sensor hydrogen sulphide L Toxic sensor chlorine O Oxygen sensor S Toxic sensor sulphur dioxide ...

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