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LTH MOD53, Руководство по эксплуатации

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16   OE15 Membrane Replacement 

 

 

 

 

79

 

 

 

 

 

 

 

 

 

 

 

16   OE15 Membrane Replacement 

 

The electrode membrane is very delicate and may be damaged by careless use.  
Inspect the electrode periodically for signs of membrane damage and replace it if 
necessary.  

 

Remove the damaged membrane and 
the two ’O’ rings retaining it and set 
these aside.  Cut a 120mm length of 
membrane and fit to the applicator as 
shown by passing it through the middle 
and evenly stretching the front edge 
back over the outside.  Slide the 
applicator carefully over the electrode 
taking care not to stretch the 
membrane.  Release the membrane at 
the top and withdraw the applicator. 

Содержание MOD53

Страница 1: ...MOD53 DISSOLVED OXYGEN MONITOR OPERATION GUIDE...

Страница 2: ...ng fuses etc within the unit Any attempt to dismantle the instrument will invalidate the warranty Disclaimer LTH Electronics Ltd reserves the right to make changes to this manual or the instrument wit...

Страница 3: ...he European Low Voltage Directive using BS EN 61010 1 1993 Quality This instrument has been manufactured under the following quality standard ISO 9001 2001 Certificate No FM 13843 Note The standards r...

Страница 4: ...Connections 16 Pressure Transmitter Input 17 RC2 Cleaner Connection 17 Digital Inputs 18 4 Installation Surface Mount 19 Pipe Mounting 20 Terminal Connections 21 Supply Voltage Connections 21 Current...

Страница 5: ...alibration 60 Temperature Calibration 61 Pressure Input Calibration 62 Current Output Calibration 63 Resetting The User Calibration 64 11 Save Restore 65 12 Pressure Input 67 13 Configuration 71 14 Se...

Страница 6: ...mmHg Calibration specific 0 9999 mBar pO2 Calibration specific Accuracy 3 A Galvanic Mode 1 0nA Polargraphic Mode Linearity 0 1 of Range Repeatability 0 1 of Range Temperature Sensor 4 wire interface...

Страница 7: ...ers up to 10 mins and hysteresis in On Off mode Adjustable dose alarm timer to 15 mins in all modes Adjustable cycle time and band in Proportioning modes Adjustable duration recovery and interval peri...

Страница 8: ...TRUMENT LOCAL WIRING AND SAFETY REGULATIONS SHOULD BE STRICTLY ADHERED TO WHEN INSTALLING THIS UNIT SHOULD THESE REGULATIONS CONFLICT WITH THE FOLLOWING INSTRUCTIONS CONTACT LTH ELECTRONICS OR AN AUTH...

Страница 9: ...tools High intensity discharge lights Silicon control rectifiers that are phase angle fired The MXD53 series is designed with a high degree of noise rejection built in to minimise the potential for i...

Страница 10: ...dimensions panel mounting MOD53 The panel cut out for mounting the unit should be 92 mm x 92 mm 1 0 0 0 A sealing gasket is supplied with the MOD53 to be fitted around the edge of the cut out Two scr...

Страница 11: ...he unit Top Connector Bottom Connector Expansion Port where fitted Earth Stud Figure 2 Panel mount unit rear view The top connector houses the power input relay and current output terminals The bottom...

Страница 12: ...elay contacts and or other instruments The instrument uses a universal power supply that accepts a wide range of voltage and frequency inputs Refer to the label adjacent to the power supply terminals...

Страница 13: ...ll current loop When either of the outputs is open circuit in a dual output unit the other will indicate a fault by transmitting a 2mA signal This will be accompanied by a flashing error message on th...

Страница 14: ...POINT RELAYS 3 4 CONNECTION When fitted the expansion port connector houses the additional relay output terminals NB The relay contacts are volt free and should be wired in series with a supply and lo...

Страница 15: ...8 Panel mount unit bottom connector wiring SENSOR INPUT CONNECTIONS The MOD53 has been designed with the flexibility to accept a wide variety of both Galvanic and Polargraphic Dissolved Oxygen probes...

Страница 16: ...f the most commonly used LTH cable types Do not use any other type of cable than those recommended by LTH or the sensor manufacturer to extend the sensor instrument distance Figure 10 OE15 Cable The o...

Страница 17: ...ire sensors although for the specified accuracy it is necessary to use the 4 wire configuration for cable lengths over 5 metres Figure 12 Standard RTD Temperature Connection Figure 13 ProcessProbe 22K...

Страница 18: ...n is selected in the software set up Figure 14 Pressure Transmitter Connections NB The negative connection shares the same terminal as the Galvanic sensor anode connection RC2 CLEANER CONNECTION If th...

Страница 19: ...digital inputs are used to externally initiate a clean cycle or take the unit Off Line These inputs are intended to be switched using a volt free link switch or relay Closing the contact will initiate...

Страница 20: ...s are provided for this purpose Note that fasteners are not provided Figure 16 Overall dimensions surface mounting MOD53 LTH recommend using No 10 x 1 inch round head screws or similar for mounting Ca...

Страница 21: ...shown in the exploded view below Figure 17 MOD53 handrail pipe mounting brackets The brackets can be fitted either vertically or horizontally Position the channels to the rear of the mounting plate an...

Страница 22: ...nwanted RF energy from being radiated inside the housing Make sure not to strain the cable within the instrument Tighten the cable gland onto the cable so that it grips sufficiently to seal and to pre...

Страница 23: ...is shipped with links across the relevant current output pins if the option is fitted If a current output is required remove the link and replace with a cable terminated by a load resistance not excee...

Страница 24: ...with a 5 Amp fuse MOD53 Load A Neutral Live Neutral Load B 5A Figure 20 Relay contact connection A contact arc suppressor may be required to prevent excessive electrical noise depending upon the load...

Страница 25: ...It will be necessary to identify the sensor type e g Galvanic or Polargraphic and the temperature sensor type e g PT1000 or thermistor Figure 22 Sensor Connections SENSOR TYPES The following figures...

Страница 26: ...4 Installation Surface Mount 25 Figure 24 ProcessProbeTM Cable...

Страница 27: ...nfigured as 2 or 4 wire sensors although for the specified accuracy it is necessary to use the 4 wire configuration for cable lengths over 5 metres Figure 25 Standard RTD Temperature Connection Figure...

Страница 28: ...on is selected in the software set up Figure 27 Pressure Transmitter Connections NB The negative connection shares the same terminal as the Galvanic sensor anode connection RC2 CLEANER CONNECTION If t...

Страница 29: ...digital inputs are used to externally initiate a clean cycle or take the unit Off Line These inputs are intended to be switched using a volt free link switch or relay Closing the contact will initiat...

Страница 30: ...oring instrument THE FRONT PANEL The MOD53 uses a versatile dot matrix character LCD to display all of the settings and readings The seven segment digits at the top of the display indicate the primary...

Страница 31: ...will flash on the bottom row of the display Pressing the ENTER key when an error message is flashing will scroll a more detailed description of the error along the bottom line Pressing ENTER again wil...

Страница 32: ...ER to begin editing the access code 0 0 0 0 0 0 0 0 0 0 0 0 Access Code Use the UP and DOWN keys to change the first digit 0 0 0 00 0 0 0 0 0 0 0 Access Code Press ENTER to select the next digit 6 6 6...

Страница 33: ...7 5 6 3 7 5 Access Code If the new code is correct the Padlock symbol will now change to a Key symbol Note 6375 is only an example of an access code the correct code will need to be entered to unlock...

Страница 34: ...returning to the main display There are two levels of access to the menu structure refer to the menu structure printed inside the back cover The first level allows access to the basic setup operation...

Страница 35: ...Point Mode is achieved in a similar fashion E g Using the Units menu function in the Parameters menu Press the ENTER key to start the text flashing Press the UP and DOWN keys to cycle through the dis...

Страница 36: ...r UP or DOWN to cancel the function e g Restore Setup B Select the required function and press the ENTER key Are You Sure To continue press the ENTER key again To abort the Restore press any other key...

Страница 37: ...5 User Interface 36 This page intentionally blank...

Страница 38: ...0 0 Conc 15 53 ppm Sensor Saturation Concentration When Display units are Saturation Any combination of Sensor operating units can be displayed here in the same format as the two examples above but a...

Страница 39: ...l not be displayed if has been configured to Cleaning operation 6 0 0 6 0 0 6 0 0 6 0 0 Temp 72 5 C Sensor Temperature Input When Compensation Auto 6 0 0 6 0 0 6 0 0 6 0 0 Man IP 25 0 C Sensor Fixed T...

Страница 40: ...ibration Available when access parameter is set in the Calibration menu 1 0 0 1 0 0 1 0 0 1 0 0 Atm Calib Pressure When Span Calibration is complete the calibration pressure is displayed The Calibrati...

Страница 41: ...6 Main Display 40 This page intentionally blank...

Страница 42: ...menu contains the basic configurations for the sensor inputs Parameters Parameters Menu Header Units Sat ppm pO2 mm Hg Current Display Units Probe Galvanic Polargraphic Sensor Type Temp Units C F Temp...

Страница 43: ...se defaults to Manual 2 5 0 2 5 0 2 5 0 2 5 0 C Manual Temperature input for manual compensation Only present when temperature compensation is set to Manual 1 9 0 1 9 0 1 9 0 1 9 0 ppt Input Salinity...

Страница 44: ...te 12 00mA Simulate sensor input Use the Up and Down keys to scan through the input range to test the Set Point Relays and Current Outputs UNITS The MOD53 primary display can be setup to display in sa...

Страница 45: ...e used The operator can apply automatic or manual temperature compensation to the dissolved oxygen measurement by selecting the mode of operation in the T Comp menu item within the Parameters menu For...

Страница 46: ...UT The facility exists within the MOD53 to simulate the input sensor levels to test the set point and current output operation This function allows the user to cycle up and down through the sensor ran...

Страница 47: ...7 Parameters 46 This page intentionally blank...

Страница 48: ...e a high level of flexibility in the configuration of the relay outputs Set Points 1 2 Set Points Menu Header SP1 Disabled Sensor IP Temp IP Cleaning Set Point Source Control When cleaning is selected...

Страница 49: ...Alarm Y N Set Point 1 Dose Alarm Timer Enable 0 0 3 0 0 0 3 0 0 0 3 0 0 0 3 0 mm ss SP1 Alarm Time Set Point 1 Dose Alarm Time Only visible when Timer Enable Y 0 0 3 0 0 0 3 0 0 0 3 0 0 0 3 0 mm ss SP...

Страница 50: ...basically the same for the sensor and temperature inputs For cleaning operation the menu items are replaced by the cleaning menu SET POINT TRIGGER The set points can be configured to trigger in four...

Страница 51: ...ysteresis level should therefore be set to be a little larger than the input noise level Time Proportional Mode The MOD53 provides two forms of pseudo proportional control which can be used to control...

Страница 52: ...ergised for longer than the Alarm Time the alarm will activate de energising the relay to prevent over dosing and flash the relative set point LED on the front panel The display will also flash a warn...

Страница 53: ...Set Points 3 4 Menu Header The Set Point 3 menu continues from here and is structured in the same manner as for Set Points 1 and 2 Relay 4 will energise only when the selected state occurs and de ene...

Страница 54: ...f the outputs is open circuit in a dual output unit the other will indicate a fault by transmitting a 2mA signal This will be accompanied by a flashing error message on the Display E41 Current Output...

Страница 55: ...r the current output can be set to one of two ranges either 0 20mA or 4 20mA This selection sets the limits of the zero and span output levels The output will continue to provide an extrapolated outpu...

Страница 56: ...setting the point at which the output is 4 mA as the set point e g 7 00 ppm and the point at which the output is 20 mA as the proportional band e g 4 00 ppm a simple form of proportional control is ac...

Страница 57: ...9 Current Output 56 This page intentionally blank...

Страница 58: ...The Off Line LED on the front panel will illuminate Cal Access Y N Setting this to Y enables the sensor calibration menu items on the main display Cal Units Sat ppm pO2 mm Hg The instrument can be cal...

Страница 59: ...turation Calibration 1 0 0 0 1 0 0 0 1 0 0 0 1 0 0 0 Set Span Cal Pt Set Span Calibration Level 0 100 in whichever calibration units have been selected Sensor Span Sensor Span Calibration AutoCal N Y...

Страница 60: ...cted the relays and current output operate normally The middle LED on the front panel indicates when the unit is Off Line In addition the user can set the unit to Off Line by using the digital input t...

Страница 61: ...input current that equates to the 0 Saturation input level Sensor Span Sensor Span Calibration Place sensor in saturated solution Press to begin calibration Are You Sure The instrument will ask for c...

Страница 62: ...ic Are You Sure The instrument will ask for confirmation Press to confirm any of the other 3 buttons abandons the temperature calibration 2 5 0 2 5 0 2 5 0 2 5 0 C The Temperature reading is now displ...

Страница 63: ...f the other 3 buttons will abandon the sensor calibration Set Input to 4mA Set the pressure transmitter output to 4mA Press ENTER to start Sampling The unit will sample the 4mA input current When comp...

Страница 64: ...hey are referred to as A and B respectively Current Output Current Output Calibration 0 4 20mA levels Press to start calibration Are You Sure The unit will request confirmation before beginning the ca...

Страница 65: ...menu item Reset User Cal Reset all User calibrations to default states Press ENTER to initiate reset Are You Sure The unit will ask for confirmation before resetting the user calibrations Press ENTER...

Страница 66: ...nstrument setup into either of two stores or restore a previously saved setup from one of the two stores or two default setups Save Restore Save Restore Menu Header Save As Setup A Save current instru...

Страница 67: ...sing the ENTER key again will initiate the function The unit will then perform the function and then return to the main menu This facility is very useful when testing or fault finding is required The...

Страница 68: ...p The MOD53 has the ability to support both direct 4 20mA input and 24V loop powered systems by setting this parameter NB A User Calibration is essential in the 24V loop mode Units Atm Bar kPa m H2O p...

Страница 69: ...it B Enter To Limit Input Mode The MOD53 is designed to accept either direct 4 20mA input or to interface to a 24V loop powered transmitter Care should be taken when connecting the unit to ensure that...

Страница 70: ...level it was at prior to damping being applied then the damping will be cancelled whether the twenty seconds has expired or not The user may also cancel the pressure damping by pressing the ENTER key...

Страница 71: ...12 Pressure Input 70 This page intentionally blank...

Страница 72: ...t multilingual text messaging this can be selected from this menu Francais Espanol T Input Disabled The temperature sensing input can be configured to accept a variety of resistive sensing elements PT...

Страница 73: ...g error messages on the main display When disabled a flashing Bell character will indicate an error is present IP Filter Out Input Filtering 10 Secs 20 Secs 40 Secs 1 Min 3 Mins 5 Mins Input Filtering...

Страница 74: ...en one or other has been set to cleaning mode 0 0 3 0 0 0 3 0 0 0 3 0 0 0 3 0 mm ss Cleaning Duration The duration of the cleaning operation 5 seconds to 10 minutes 0 1 3 0 0 1 3 0 0 1 3 0 0 1 3 0 hh...

Страница 75: ...sult of cleaning solution being sprayed onto the sensor By selecting the automatic Off Line facility in the menu spurious relay current output changes are prevented during the Duration and Recover per...

Страница 76: ...Any error messages that are displayed 9 The sensor type cable length and type 10 Current output configuration 11 Relay connection configuration It is often worthwhile to check the measurement by an i...

Страница 77: ...ck that the temperature sensor type is correctly selected in the Configuration menu Where practical check the temperature sensor resistance against the table in Appendix F Check the user calibration C...

Страница 78: ...ance The period for this will depend upon the application e g in aeration tanks a weekly check on calibration and fouling would be a reasonable estimate for rivers a longer period and in ditches it ma...

Страница 79: ...15 Fault Finding 78 This page intentionally blank...

Страница 80: ...ace it if necessary Remove the damaged membrane and the two O rings retaining it and set these aside Cut a 120mm length of membrane and fit to the applicator as shown by passing it through the middle...

Страница 81: ...this over the electrode taking care not to touch the membrane covering the silver cathode Push off the first O ring to locate in the top groove without stressing the membrane Fit the second O ring in...

Страница 82: ...d no further guarantee is given although any complaints concerning their operation will be carefully investigated Goods for attention under guarantee unless otherwise agreed must be returned to the fa...

Страница 83: ...17 Guarantee and Service 82 This page intentionally blank...

Страница 84: ...between the cathode an anode of the DO cell to excite an output The equation for converting current input to saturation is as follows Saturation I Io x Pc x M x 100 Where I Measured Input Current Io 1...

Страница 85: ...he Oxygen solubility is easily defined as Saturation X Maximum Theoretical Solubility of Oxygen in water The maximum theoretical solubility is heavily dependant on the temperature pressure and salinit...

Страница 86: ...table gives the necessary configuration data for a number of DO probes Probe Type Temperature Sensor Type Membrane Correction Factor Bias Voltage LTH OE15 1K Thermistor 3965 N A BJ ProcessProbe TM 22...

Страница 87: ...Appendix B Probe Parameters 86 This page intentionally blank...

Страница 88: ...0 C Fixed Salinity Input 0 00 ppt 0 00 ppt Pressure Compensation Manual Manual Pressure Units Atm Atm Fixed Pressure Input 1 00 Atm 1 00 Atm Set Points SP1 Source Sensor Sensor SP1 Trigger Low Low SP1...

Страница 89: ...Time mm ss 00 30 00 30 SP2 Proportional Band 20 0 20 0 SP3 Source Sensor Sensor SP3 Trigger Latch Latch SP3 Level Latch High 50 0 50 0 SP3 Latch Low 20 0 20 0 SP3 Mode On Off On Off SP3 Dose Alarm No...

Страница 90: ...de Input Input Units Atm Atm 4mA Level 0 40 Atm 0 40 Atm 20mA Level 2 00 Atm 2 00 Atm Pressure Damping Disabled Disabled Pressure Limit A From 0 00 Atm 0 00 Atm Pressure Limit B To 0 00 Atm 0 00 Atm C...

Страница 91: ...Appendix C Factory Default Setups 90 This page intentionally blank...

Страница 92: ...e Type Temperature Units Temperature Compensation Fixed Temperature Input Fixed Salinity Input Pressure Compensation Pressure Units Fixed Pressure Input Set Point 1 SP1 Source SP1 Trigger SP1 Level La...

Страница 93: ...m ss SP2 Hysteresis of SP Level SP2 Cycle Time mm ss SP2 Proportional Band of range SP3 Source SP3 Trigger SP3 Level Latch High SP3 Latch Low SP3 Mode SP3 Dose Alarm SP3 Alarm Time mm ss SP3 Delay mm...

Страница 94: ...t A Zero Output A Span Input B Output B Output B Zero Output B Span Pressure Input Mode Units 4mA level 20mA Level Damping Limit A From Limit B To Calibration Mode Calibration Access Configuration Lan...

Страница 95: ...Appendix D Customer Setup 94 This page intentionally blank...

Страница 96: ...tion is done in Saturation even if the required operating mode is concentration Approximate sensor current is 700uA 100 Sat with Galvanic sensor and 60nA 100 Sat with Polargraphic sensor Zero Check in...

Страница 97: ...the process solution and therefore as close to the temperature of that solution as possible Observe the instrument readings and wait until the output stabilises If necessary enable the sensor filter t...

Страница 98: ...vailable on all models Temperature C PT1000 RTD LTH 1K Thermistor BJ 22K Thermistor 0 1000 0 2691 64 88 k 10 1039 0 1779 41 34 k 20 1077 9 1204 26 97 k 25 1097 3 1000 22 00 k 30 1116 7 833 7 18 03 k 4...

Страница 99: ...Appendix F Temperature Sensor Data 98 This page intentionally blank...

Страница 100: ...rsions between all the common pressure units mm Hg 760 750 7 50 73 36 51 72 1 psi 14 696 14 504 0 145 1 422 1 0 0194 m H 2 0 10 33 10 20 0 102 1 0 703 0 0136 kPa 101 33 100 1 9 81 6 895 0 133 Bar 1 01...

Страница 101: ...Appendix G Pressure Conversions 100 This page intentionally blank...

Страница 102: ...1 14 19 22 8 73 2 13 81 23 8 55 3 13 44 24 8 40 4 13 08 25 8 24 5 12 75 26 8 08 6 12 42 27 7 94 7 12 12 28 7 80 8 11 82 29 7 66 9 11 54 30 7 54 10 11 27 31 7 41 11 11 01 32 7 28 12 10 75 33 7 15 13 10...

Страница 103: ...n of oxygen concentration in ppm mg litre across a temperature range of 0 40 C in pure water at equilibrium with water vapour saturated air at 1 Atmosphere standard pressure 760 mm Mercury For other o...

Страница 104: ...the unit off then on again If the message persists consult with your supplier as this unit will require to be returned for repair E04 Setup Checksum Error The instrument configuration has for some re...

Страница 105: ...is less than the 0 saturation current E35 Temperature Sensor Fault The temperature sensor is reading open or closed circuit due in most cases to a damaged sensing element or incorrect wiring When thi...

Страница 106: ...rent output span E44 Sensor Input Current OP B Zero Level Sensor input level is below that set for the current output zero E45 Sensor Input Current OP B Span Level Sensor input level is above that set...

Страница 107: ...Appendix I Error Messages 106 This page intentionally blank...

Страница 108: ...21 Temperature 16 26 Current Output 53 Calibration 59 63 Connections 12 22 Display 39 Input Source 54 Output B 55 Output Range 54 Zero Span 53 54 Customer Setup 91 D Default Galvanic 66 87 Default Po...

Страница 109: ...tion 43 Sensor Connections 14 24 Filtering 72 Simulation 43 Sensor Type 44 Set Point 1 2 47 3 4 52 Cycle Time 49 Delay 48 50 Dose Alarm 48 Hysteresis 48 50 Level 47 Mode 48 52 On Off Mode 50 PP Mode 5...

Страница 110: ...LTH Electronics Ltd Chaul End Lane Luton Bedfordshire LU4 8EZ United Kingdom Telephone 44 0 1582 593693 Fax 44 0 1582 598036 e mail sales lth co uk web www lth co uk...

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