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OMG200N1.23

G200 Analyser Range

Page

7.0 Calibration

7.1 User

Calibration

The G200 range of instruments is fully calibrated during manufacture and when returned for

service. However, to improve accuracy between services a user/field calibration can be

performed.

This section sets out the correct procedures to achieve an accurate user calibration.

Note:

If the calibration is completed incorrectly it may decrease the accuracy of the
instrument.

Two important terms that are used within this section are “Zero” and “Span”.

Zero:

The point at which the instrument is calibrated when there is none of the target

gas present.

Span:

The point at which the instrument is calibrated when a known quantity of the

target gas is present.

7.2 Calibration

Gases

User calibration of the instrument will improve the data accuracy in the range of the

calibration gases used. However, it may cause less accurate readings of concentrations

outside this calibrated range. Users should select the correct calibration gas for the

expected gas levels on their particular application. Only use gases with a known certified

gas concentration.

Note:

Certified calibration gases can be supplied by Geotechnical Instruments (UK)
Limited.

Warning

For each gas used the appropriate material safety data sheet

must be read and understood before proceeding. Calibration

gases and the use of pressure regulators can be dangerous.

7.3 Calibration

Set-up

The regulator supplied with the calibration kit has been configured to deliver a fixed flow. It

only requires a few turns to open and no adjustment is necessary.

Warning

Exhaust Port
When the instrument is being calibrated, there are two possible

exits for the gas; via the usual manner out of the exhaust port

of the instrument or in cases of over-pressurisation the 1/16

”

port on the pressure relief valve.
It is recommended that both ports have exhaust tubing

attached. The exhaust tubing must emerge in a well-vented

area. Ensure there are no leaks in the tubing and connections.
The calibration should always be carried out in a safe area with

all necessary precautions taken as all pressurised gases are

potentially dangerous.

Содержание Geotech G200

Страница 1: ...alyser Range Operating Manual G200 N20 0 1 000ppm G210 N20 0 100 Geotechnical Instruments UK Ltd Sovereign House Queensway Leamington Spa Warwickshire CV31 3JR England Tel 44 0 1926 338111 Fax 44 0 1926 338110 Email sales geotech co uk Website www geotech co uk ...

Страница 3: ... 0 INSTRUMENT FEATURES 12 4 1 Physical Characteristics of the Instrument Panel 12 4 2 Panel Key Functions 13 4 3 Instrument Connection Points 14 5 0 GENERAL OPERATIONAL INSTRUCTIONS 15 5 1 Switching the Instrument On 15 5 2 Switching the Instrument Off 15 5 3 Entering Data 15 5 4 Instrument Status Icons 16 5 5 Changing Between Parameters 17 5 6 Memory 17 5 7 Storage 17 5 8 Warning and Error Codes ...

Страница 4: ...6 7 5 2 Span Channels 36 7 5 3 Reset Factory Settings 37 7 6 Last Field Calibration 37 7 7 Calibration Record 37 7 8 Recommended Gases for Calibration 38 7 9 G200 Range Calibration Best Practice 39 8 0 PROBLEM SOLVING 40 8 1 Warnings and Errors 40 8 2 Battery No Charge Reset 40 8 3 Self test Warning Messages 41 8 4 User Calibration Trouble Shooting 43 8 5 Cross Gas Effects 44 8 6 Hardware Reset 45...

Страница 5: ...1 23 New Instructions 1 2 Safety Related Information Information in this manual that may affect the safety of users and others is preceded by the following symbol Warning Failure to follow this information may result in physical injury which in some cases could be fatal 1 3 Notes Important useful information and instructions are shown clearly throughout the manual in a note format For example Note...

Страница 6: ...de the user with a fast simple to use and accurate piece of monitoring instrumentation Note These instruments are sensitive pieces of scientific equipment and should be treated as such 2 1 The G200 Analyser The G200 analyser is specifically designed to safety check background zone levels of N2O 0 1 000ppm in medical applications This instrument measures the long term exposure to N2O gas along with...

Страница 7: ...y designed for highly accurate measurement and verification of the quality of piped N2O and O2 gases in hospitals This instrument enables up to four gases to be measured easy user calibration quick verification of gas quality user maintained site and sample point IDs for monitoring as well as identification of contaminants CO and CO2 The analyser has the following features N2O 0 100 O2 0 100 optio...

Страница 8: ...ht 2010 Geotechnical Instruments UK Limited 2 3 Instrument Components Standard Product G200 Model Reference A Analyser B Mains Battery Charger C Mains Battery Charger Adaptors Europe US Australia D Soda Lime CO2 Filter G200 Only E Operating Manual ...

Страница 9: ... This can be used as an aid to monitoring the use of the instrument It can also be used as a diagnostic tool if there is a problem with the instrument The event log can only be viewed via the optional Analyser Data Manager software It cannot be viewed on the analyser screen Applicable events are stored in the event log automatically No user intervention is required The event log can hold approxima...

Страница 10: ...r should always be fitted when using a G200 instrument as any CO2 will cross contaminate the N2O reading For further information please refer to section 8 5 Cross Gas Effects The life of the filter will vary depending on usage The crystals change colour from pale green blue to white grey The filter element should be discarded when a significant percentage of the crystals start to turn a white grey...

Страница 11: ...eotech co uk for further details on pricing and how to order Ref Description Mfr Order Code A USB Lead USBLEAD2 B Spare Sample Filters pack of 5 068296 S C Sample Tube Kit G1 6 D Hard Carry Case 050227 E Spare Calibration Gas Various gas options available CDA7 6 F Mains Charger including Worldwide Adaptors 073024 G Soft Carry Case G1 11 H Soda Lime Filter Kit G1 10 I Analyser Data Manager Software...

Страница 12: ...rument Features 4 1 Physical Characteristics of the Instrument Panel Front View Reference Back View A Main Read Screen B Soft Keys C On Off Key D Pump Key E Key 4 Scroll Left F Key 8 Scroll Down G Menu Key H Enter Key I Key 2 Scroll Up J Key 6 Scroll Right Reference L Serial Number M Instrument Stand ...

Страница 13: ...briefly to switch the instrument on and off D Pump Key Press the Pump key to start or stop the pump E Scroll Left Key Also Key 4 Enables the operator to scroll left to display more information F Scroll Down Key Also Key 8 Enables the operator to scroll down to display more information G Menu Key Press the Menu key to go to the Main menu Enables the operator to preset values and settings Select opt...

Страница 14: ...used to attach the sample tube and sample filter in order to take the gas reading B Gas Outlet Gas outlet port used to exhaust the gas C Side View USB Cable Attachment Point Used to connect the analyser to a PC via a USB cable on order to download data D Mains Battery Charger Point Used to attach the mains charger to the analyser for charging 5V 0 5V max 1000mA 5V 0 5V max 1000mA ...

Страница 15: ... off the instrument press the On Off key briefly Note If the Auto Off utilities setting is set to Yes the analyser will switch off automatically after ten minutes if not in use 5 3 Entering Data During normal operation the user may be prompted to enter data or information via the keypad i e entering an ID code or setting an alarm level When entering data into the instrument all fields are fixed fo...

Страница 16: ...e entered this should be deleted and re entered 5 4 Instrument Status Icons The following icons may be displayed on the instrument read screens Icon Description Battery charge state flashing 1 hour remaining backlight flashes when power low flashing Battery charging Charged Pump running flashing Pump stalled Backlight turns red Alarm set flashing Alarm active Backlight turns red USB connected to P...

Страница 17: ...equence taking approximately ten seconds During this time many of the instrument s working parameters and settings are checked If any operational parameters are out of specification or if the pre programmed recommended calibration service date has passed errors or warnings may be displayed Note For further information please refer to section 8 0 Problem Solving 5 9 Battery Charging The battery use...

Страница 18: ...ill only display peak values for each of the channels These values can then be stored by pressing the Store key or automatically at the appropriate logging interval if logging is enabled The peak value is reset after a reading is stored or by exiting the peak mode using the appropriate soft key The current mode of operation can be identified by the status of the soft key either Normal or Inverse w...

Страница 19: ...d 5 11 Enter ID Codes ID codes are either created at the time of selection on the analyser or created using the Analyser Data Manager software and uploaded to the instrument for selection prior to readings being taken The Site top level ID and ID second level ID fields refer to the identifier that the operator gives to a reading set before it is stored The G200 and G210 allows the operator to ente...

Страница 20: ... taken or to view data and information stored in the instrument Note Unless otherwise stated the functions and menus are the same for both the G200 and G210 instrument 1 Press the Menu key on the front of the instrument panel and the following screen is displayed Main Menu 2 Press the soft key Exit to exit the Main menu 5 12 1 Information The Information option enables the operator to display info...

Страница 21: ...r to check or set the instrument s internal clock The current time date are appended to every stored reading 1 From the Main Read Screen press the Menu key on the instrument panel 2 Press Key 2 to display the Utilities menu 3 Press Key 1 and the Set Time Date menu is displayed Set Time Date 4 Press Key 1 to change the time or press Key 2 to change the date Type the time or date using the numeric k...

Страница 22: ...the facility to set rising or falling alarms for the main gas channels The alarms for each channel can be enabled or disabled independently via the Alarms menu option Once enabled these alarms become active in the Main Read Screen this is indicated by a bell icon If an alarm is triggered the screen turns red and a flashing bell icon is displayed The beeper is sounded until the gas level has recove...

Страница 23: ...ttings 4 The following instrument settings may be maintained 1 Prompt ID Press Key 1 to prompt for ID code for each sample reading answer Yes or No accordingly Temperature This option is not available on the G200 range of instruments 3 Date Press Key 3 to switch the date format between dd mm yy and mm dd yy formats 4 Auto Off Press Key 4 to auto switch off the instrument when not in use Toggle bet...

Страница 24: ...Main Read Screen press the Menu key on the instrument panel 2 Press Key 2 to display the Utilities menu 3 Press Key 5 to select Flow Fail and the following screen is displayed Adjust Flow Fail 4 Use the scroll keys Key 4 Scroll Left or Key 6 Scroll Right to adjust the value displayed The larger the value the less sensitive the flow fail detection is 5 Press soft key Accept or Reject accordingly Fo...

Страница 25: ... 2010 Geotechnical Instruments UK Limited Page 25 Flow Fail Set up Process Best Practice Make sure that you have carried out the Preliminary Checks Best Practice before commencing the Flow Fail Set up Refer to Section 6 1 for more information ...

Страница 26: ... Press Key 1 to enter the time in minutes for the time frame between sample readings The interval controls the reading frequency in minutes i e every ten minutes 2 Pump 00 secs Press Key 2 to enter the time in seconds for the length of time you wish the pump to run when taking a sample reading The pump run time is the time in seconds for which the pump runs prior to the reading being stored This f...

Страница 27: ...d Note For further information please refer to section 7 0 Calibration of this manual 5 12 4 View Data The View Data option enables the operator to view the stored readings 1 From the Main Read Screen press the Menu key on the instrument panel 2 Press Key 4 View Data to view the stored data readings and the following screens are displayed Press Key 8 Scroll Down View Data Screen 1 View Data Screen...

Страница 28: ... optional parameters not activated for your particular instrument configuration i e oxygen temperature and humidity Once the reading memory is full it is not possible to store any more readings When full and the Store key is pressed or data logging is activated the instrument will show a brief message stating that the memory is full and that no further data will be recorded 1 From the Main Read Sc...

Страница 29: ...12 5 Diagnostics The Diagnostics option enables Geotech Technical Support to identify and resolve issues with the instrument and readings If required the operator may be asked to confirm the diagnostics displayed 1 From the Main Read Screen press the Menu key on the instrument panel 2 Press Key 5 to view diagnostics Note For further information contact Technical Support at Geotechnical Instruments...

Страница 30: ...reen The alternate twa is represented mathematically by the following equation C1 C2 Cn elapsed time in hrs This mode would typically be used to monitor a ventilation system in an operating theatre or similar where N2O is used throughout the day with different people coming and going Primarily for room or area monitoring this mode is intended to give the operator a little more flexibility and can ...

Страница 31: ... has sufficient space available G210 model only Step 7 Verify that the main gases have been auto zeroed without gas concentration present Step 8 Verify the span calibration with a known concentration calibration check gas Step 9 Instrument is ready to take readings Do protect the instrument from strong direct sunlight which will quickly raise the temperature of the instrument beyond its operating ...

Страница 32: ...ary checks as listed in section 6 1 Preliminary Checks Best Practice and that the instrument is ready to take the first reading Always use a sample filter and a soda lime filter with a G200 instrument 3 Connect the sample tube if relevant from the sample point to the inlet port of the instrument ensuring the filter is seated correctly 4 From the Main menu select the mode in which you wish to opera...

Страница 33: ...ise Take another reading YES NO NO YES 1 When the instrument is first switched on it should be purged with fresh air and allowed to stabilise for a few minutes 2 Make sure that you have carried out all the preliminary checks as listed in section 6 1 Preliminary Checks Best Practice and that the instrument is ready to take the first reading Always use a regulator pressure kit with the G210 instrume...

Страница 34: ...range Users should select the correct calibration gas for the expected gas levels on their particular application Only use gases with a known certified gas concentration Note Certified calibration gases can be supplied by Geotechnical Instruments UK Limited Warning For each gas used the appropriate material safety data sheet must be read and understood before proceeding Calibration gases and the u...

Страница 35: ...n The regulator supplied with the calibration kit is recommended as flow and pressure rates are factory set Note Maximum input pressure 250mb maximum flow 300ml 7 5 Calibration Method Before you begin ensure the unit is stabilised at its working temperature before performing any of the calibration operations To achieve the processes set out in this section press Key 3 Calibration from the Main men...

Страница 36: ...alibration 2 Select either Key 1 Zero with N2 recommended or Key 2 Zero with Air from the menu Then either attach the 100 N2 or sample pipe to allow access to fresh air 3 Press the Start key The instrument will now wait a minimum of 60 seconds for the gas reading to stabilise at the correct level If zeroing with air press the Pump key to draw in fresh air This operation will time out after five mi...

Страница 37: ...ctory settings press Key 1 Factory Reset from the Calibration menu User Calibration Reset 2 To prevent the user calibration data being accidentally erased the user must confirm the action by pressing the soft key Accept or soft key Reject to exit without change 7 6 Last Field Calibration This data can be found in the Information screen accessed via the Utilities menu This option displays the date ...

Страница 38: ...e downloaded and viewed via the optional Analyser Data Manager software It cannot be viewed on the analyser screen 7 8 Recommended Gases for Calibration The calibration gas recommended depends on the desired operation and concentration of target gas The following table outlines the recommended gases that can be used for calibrating each of the measurements Instrument G200 G210 Application LEL Leak...

Страница 39: ...bration gas cannister Disconnect gas cannister Select Option 3 Span Gas Zero with N2 or Zero with Air N2 Press start Wait for gas to stabilise Completed OK select Accept WAIT Connect gas for Span Calibration Gas Go on to the Span gas process Select gas to Span Select Option 1 Edit to your certified gas concentration Press Enter Air NOT best practice Press start target value Wait for screen to stab...

Страница 40: ...The most likely reason for these errors is either an incorrect user calibration or they may indicate sensor failure If an incorrect user calibration has caused the warning it should be correctable by way of returning the instrument to factory settings zeroing or carrying out a user calibration as necessary for the relevant function Under and Over Range Codes If a reading is over range i e above th...

Страница 41: ...in the sample tubes Alternatively a small amount of adjustment can be made to the low flow detection point to compensate for minor changes in the performance of the pump fitted to the instrument Check N2O Cal This warning is most commonly caused by an incorrect user calibration Try recalibrating the sensor or press Return to factory settings If the warning persists it may be caused by dirt or dama...

Страница 42: ... Time Date option via the Utilities menu Baro Fault The instrument has detected a fault with the barometric sensor or its calibration This will have an effect on the accuracy of the readings as they are pressure compensated The instrument will need to be returned to the manufacturer for service Sensor n Failed Sensor n is expected but not reading a valid value This is generally a hardware fault or...

Страница 43: ...correct and retry spanning the channel Repeat the entire procedure including zeroing the channel and then calibrate the span Ensure the reading is stable before spanning the channel User Calibration Explained User calibration is a means of optimising the performance of the instrument to the current operating conditions such as ambient temperature and pressure as well as correcting for instrument d...

Страница 44: ... done at the concentration of normal operation Typical Calibration Purge Times Typical zero calibration although displaying zero needs to be given time to settle We recommend commencing the calibration at least five minutes after the display concentration stabilises 8 5 Cross Gas Effects CO2 Cell Carbon dioxide is measured by infrared absorption at a wavelength specific to carbon dioxide There is ...

Страница 45: ... measurement gases but can have cross interference from gases not normally present in medical supply gases and suffers virtually no influence from CO2 H2S NO2 SO2 8 6 Hardware Reset If for any reason the instrument locks up and will not switch off it is possible to force a hardware reset Press and hold the On Off key for ten seconds wait at least 15 seconds and the instrument should restart automa...

Страница 46: ... user serviced Sample Filter This should be regularly inspected for damage or discolouration and changed if needed The instrument should never be operated without the sample filter as this may result in water or dust entering the instrument The filter should be changed immediately if water can be seen Failure to do so can damage the instrument Sample Tubing Always ensure that sample tubes are not ...

Страница 47: ...al Instruments UK Limited will repair or replace defective parts on an exchange basis The decision to repair or replace will be determined by Geotechnical Instruments UK Limited To maintain this warranty the purchaser must perform maintenance and calibration as prescribed in the operating manual Normal wear and tear and parts damaged by abuse misuse negligence or accidents are specifically exclude...

Страница 48: ...m dual wavelength infra red cell with reference channel Range N2O 0 1 000ppm 0 10 000ppm leak detection mode Measurement accuracy Gas N2O Resolution 1ppm Accuracy 1 5 of range 2 of reading at reference conditions1 Temperature dependence 2ppm o C typical at 100ppm N2O Pressure dependence 0 1 of reading hPa typical at 100ppm N2O Response time T90 N2O 40 seconds 1 Conditions during factory calibratio...

Страница 49: ... IP rating IP40 PHYSICAL Weight 500 grams Size L 165mm W100mm D55mm Case material ABS Polypropylene with silicone rubber inserts Keys 17 resin capped silicone rubber keys Display Liquid crystal display 128 x 64 pixel With RGB LED back light Gas sample filters User replaceable PTFE water trap filter G1 10 Soda lime filter CO2 scrubber Note Due to Geotech s continuous programme of improvement this s...

Страница 50: ...al cell Oxygen cell lifetime Approximately 3 years in air CO cell lifetime Approximately 2 years in air Range N2O 0 to 100 CO2 0 to 2000ppm O2 0 to 100 CO 0 to 500ppm Measurement accuracy Gas N2O Resolution 0 1 Accuracy 1 of range 2 of reading at reference conditions1 Temperature dependence 0 2 reading o C typical at 90 N2O Pressure dependence 0 02 of reading hPa typical at 90 N2O CO2 Resolution 5...

Страница 51: ...nd O2 alarm levels Communications USB type B mini connector HID device class Data storage 1000 reading sets 270 events PUMP Flow 100cc min typically 300cc min MAX ENVIRONMENTAL CONDITIONS Operating temperature 5 C to 40 C Operating pressure 500 to 1500mb Relative humidity 5 to 95 non condensing IP rating IP40 PHYSICAL Weight 500 grams Size L 165mm W100mm D55mm Case material ABS Polypropylene with ...

Страница 52: ...ail current limit Before and After RTC date time invalid None Factory calibration invalid or overdue Date Difference Service invalid or overdue Date Difference Field User Calibration invalid or overdue Time Channel Date Age Limit O2 Cell replacement overdue Time Channel Date Age Limit Pump replacement overdue Used Limit Battery replacement overdue Used Limit EEProm settings set to default Which Mi...

Страница 53: ... memory full Max Readings memory nearly full Limit Actual Flow fail current limit exceeded Limit Actual Automatic power off Change logging mode Status Interval Pump time Change logging mode ID ID Changing logging mode ID site Site ID Flow fail current limit exceeded Limit Actual An alarm has changed state Alarm State Actual High Low Change of alarm setting Alarm State High Low Mode of instrument c...

Страница 54: ...yser Range Page 54 Copyright 2010 Geotechnical Instruments UK Limited 13 0 Certificate of Calibration A certificate of calibration is supplied at the time of purchase and updated when the instrument is serviced For example ...

Страница 55: ...e WEEE makes producers responsible from July 1st 2007 in meeting their obligations with the fundamental aim of reducing the environmental impact of electrical and electronic equipment at the end of its life Geotechnical is now registered with the Environmental Agency as a producer and has joined a recycling scheme provider who will manage and report on our electrical waste on our behalf Our Produc...

Страница 56: ...ove is are in compliance with the following standards EMC Directive 2004 108 EC EN 50270 2006 Electromagnetic compatibility Electrical apparatus for the detection and measurement of combustible gases toxic gases or oxygen Low Voltage Directive 2006 95 EC EN 61010 1 2001 Safety requirements for electrical equipment for measurement control and laboratory use General requirements Signed Date 30 Septe...

Страница 57: ...e N2O reading every 15 minutes G200 only Backlight LED illumination of the LCD display turns off after 30 seconds pressing any key relights the display Battery charge A full battery charge will take approximately three hours Calibration The process that an instrument will undergo to enable it to measure and display the various parameters in accordance with the manufacturer s specification Chemical...

Страница 58: ...ime of factory calibration Firmware Firmware is the name given to the analyser s internal software This can be programmed using the re flash command on Analyser Data Manager The latest software release can be downloaded from the Geotech website It is also automatically updated when the analyser is returned for servicing General warnings Displayed throughout the documentation with a warning symbol ...

Страница 59: ... the instrument where that sample is not under pressure Select the Pump key on the analyser to activate Regulator flow The regulator s flow is factory set It only requires a few turns to open no adjustment is available Sample tube Tube used to transfer sample gas from the source to the analyser Soda lime CO2 filter kit Removes CO2 when taking a reading Must be fitted on the G200 model Span The poi...

Страница 60: ...ely 30 40 seconds Warranty The instrument is guaranteed against defect in materials and workmanship for a period of 12 months from the date of shipment to the user and is subject to the recommended service and recalibration requirements Zero The point at which the gas analyser is calibrated when there is none of the target gas present ...

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