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6. Take a new clean filter and push it onto the sensor. Push and rotate the filter slightly to

make sure it is fully in place.

Figure 14 Changing the silicone plug

6.4 Calibration and adjustment

Calibrate and adjust the CO

measurement of GMP231 as needed. Before starting, read through

this section completely so that you are aware of your options, and the main factors that affect

the result.

Performing an accurate calibration and adjustment takes some time and
preparation. Instead of doing it yourself, contact Vaisala.

Calibration

means comparing GMP231 to a known reference, such as calibration

gas or a reference instrument. Correcting the reading of the GMP231 so that is
measures accurately is referred to as

adjustment

6.4.1 Calibration setup

GMP231 is designed to be calibrated while it remains installed through an incubator wall. If you

calibrate the GMP231 without it being installed, note the following:

Chapter 6 – Maintenance

Содержание CARBOCAP GMP231

Страница 1: ...M211501EN E User Guide Carbon dioxide probe for CO2 incubators GMP231...

Страница 2: ...ange without prior notice Local rules and regulations may vary and they shall take precedence over the information contained in this document Vaisala makes no representations on this document s compli...

Страница 3: ...atory compliances 16 3 Installation 17 3 1 Thermal management 17 3 2 Avoiding condensation 17 3 3 Probe installation depth 17 3 4 Dimensions 18 3 5 Recommended installation 20 3 6 Wiring 22 3 7 Power...

Страница 4: ...anging the filter 69 6 3 Changing the silicone plug 70 6 4 Calibration and adjustment 71 6 4 1 Calibration setup 71 6 4 2 Effect of environmental compensations 73 6 4 3 Limits of adjustment 73 6 4 4 A...

Страница 5: ...Online store 87 Warranty 87 Technical support 87 Recycling 87 Table of contents 3...

Страница 6: ...igure 8 Electronics housing dimensions 19 Figure 9 Attachment bracket dimensions 20 Figure 10 Recommended installation 21 Figure 11 PuTTY terminal application 27 Figure 12 Hardware schematic 50 Figure...

Страница 7: ...3 Table 20 Output commands for FORM command 34 Table 21 Modifiers for FORM command 35 Table 22 Compensation mode commands 35 Table 23 ENV command 36 Table 24 STANDBY command 38 Table 25 SMODE command...

Страница 8: ...ure sequence example 59 Table 59 Get_Parameter_Info invoke message 60 Table 60 Get_Parameter_Info response message 60 Table 61 Parameter data types 60 Table 62 Parameter persistence 61 Table 63 Adjust...

Страница 9: ...1501EN D December 2014 Applicable from software version 1 1 0 onward Updated section Status word page 52 M211501EN C May 2014 Updated description for ENV command in section Changing measurement settin...

Страница 10: ...mentioned in this publication are trade names trademarks or registered trademarks of their respective owners 1 5 Patent notice This product is protected by the following patents and their correspondi...

Страница 11: ...eat the chamber interior to 180 C Special design of the probe enables easy installation through the incubator wall and ensures that the sensor optics and electronics are separated and thermally insula...

Страница 12: ...temperature and background gas Pressure compensation based on integrated pressure sensor Heating to avoid condensation on optical elements Analog output one current output channel 0 20 mA or 4 20 mA D...

Страница 13: ...10649 M4 3 Type label on housing cover not shown 4 8 pin M12 connector 5 Probe body 6 Measurement cuvette with optics and CARBOCAP CO2 sensor 7 PTFE filter 8 Silicone plug for sealing the lead throug...

Страница 14: ...ith a thermopile chip at a wavelength chosen by a micromechanical Fabry P rot interferometer FPI and a band pass filter A hermetically sealed sapphire window is used to protect the sensor chips from m...

Страница 15: ...nvironmental compensation GMP231 improves the CO2 measurement accuracy by applying various environmental compensations GMP231 compensates for the effects of Pressure Temperature Background gas oxygen...

Страница 16: ...ation and is recommended for use unless a dedicated temperature measurement is available and can be regularly updated to the GMP231 If temperature compensation is turned off GMP231 uses the default va...

Страница 17: ...the error state which is 23 mA for the 0 20 mA output This overrange and error state behavior is specific to the analog output and does not affect the readings provided by the digital outputs You can...

Страница 18: ...are unable to take either precaution touch a conductive part of the equipment chassis with your other hand before touching ESD sensitive components Hold component boards by the edges and avoid touchin...

Страница 19: ...stallation tube must be sealed from the chamber side to limit heat conduction and to prevent CO2 in the chamber from entering the probe Vaisala recommends a 44 mm diameter installation tube together w...

Страница 20: ...4 Dimensions 163 118 5 Screw BN 10649 M4 x 8 mm for 1 mm thick sheet metal attachment 11 21 30 2 1 3 19 24 8 Position only the filter inside the heated chamber Figure 6 Probe dimensions without silic...

Страница 21: ...19 2 5 Incubator s inner wall 1 3 Position only the filter inside the heated chamber Recommended diameter for installation tube 44 mm Figure 7 Probe dimensions with silicone plug M12 54 4 87 Reserve s...

Страница 22: ...hment bracket and the two screw holes on the side of the probe As the installation depth of the probe inside the chamber is critical the mounting method must allow the probe to be positioned exactly T...

Страница 23: ...obe housing 6 8 pin M12 connector 7 Cable 8 CARBOCAP sensor under PTFE filter The filter must be inside the chamber completely 9 Silicone plug Insert the plug over the probe from inside the chamber 10...

Страница 24: ...pin 5 is no longer grounded unless its internal measurement shows the temperature is too high Table 4 GMP231 connector pinout Male 8 pin M12 Pin Function 1 5 6 7 3 4 8 2 1 I2C SDA 2 RS 485 D 3 I2C SCL...

Страница 25: ...2C SCL Green 4 Analog output Yellow 5 Standby Gray 6 RS 485 D Pink 7 Power supply Blue 8 Ground Red Shield Black 3 7 Power supply The supply voltage range of GMP231 is 11 30 VDC If the analog output i...

Страница 26: ...terface settings Property Value Bit rate 19200 Parity None Data bits 8 Stop bit 1 Flow control None 4 3 Physical interface The physical interface is a non isolated 3 wire interface The data lines are...

Страница 27: ...es If the device is listed as Vaisala USB Device with a COM port number in brackets the cable is ready for use Note the COM port number you will need it later If the device is listed as Vaisala USB In...

Страница 28: ...or USB line to connect to field If you are using the PuTTY terminal application supplied by Vaisala you can press the USB Finder button to open the Vaisala USB Instrument Finder program 4 Check that t...

Страница 29: ...commands All commands can be issued either in uppercase or lowercase In the command examples the keyboard input by the user is in bold The notation cr refers to pressing the carriage return ENTER key...

Страница 30: ...r set the serial interface settings SMODE mode Show or set startup serial mode RUN STOP or POLL SNUM Show probe serial number STANDBY on off Standby mode on off turn off measurement SYSTEM Show probe...

Страница 31: ...ription cr Show listing of device information cr Show listing of device information even if the device is in POLL mode but its address is unknown Do not use the command if you have more than one devic...

Страница 32: ...scription TIME Show how long the probe has been in operation since the last startup or reset The operation counter is in format hh mm ss Full days and hours are retained in the counter minutes and sec...

Страница 33: ...mand Syntax Description R cr Start the continuous outputting of measurement values as an ASCII text string to the serial line The probe keeps outputting measurement messages at the interval that has b...

Страница 34: ...measurement messages are repeated in the RUN mode or after the R command has been given Set the output interval n interval range 0 255 xxx unit for interval setting s seconds min minutes h hours If yo...

Страница 35: ...urement format to default FORM modifier string cr modifier string String of parameters and modifiers that defines the output format length 1 150 characters Maximum length may be shorter when text stri...

Страница 36: ...example CO2 3563 ppm 9F CO2 3562 ppm 9E CO2 3559 ppm A4 Command to set output format as CO2 ppm with start of text ASCII character 002 and end of text 003 ASCII codes and without line feed and carriag...

Страница 37: ...ASCII code value decimal of a special character for example 027 for ESC ADDR Probe address 0 254 SN Probe serial number TIME Cumulative operating hours of the probe Ux Shows the name of the measureme...

Страница 38: ...rement Available only for pressure and temperature compensations Example check temperature compensation mode pass 1300 tcmode T COMP MODE ON Example change temperature compensation mode to use interna...

Страница 39: ...ation you must write all continuously updated values to RAM to avoid wearing out the EEPROM Example Show current compensation values all compensations are enabled Note that temperature and pressure co...

Страница 40: ...standby mode standby on Standby mode ON 4 9 Configuring serial line operation Table 25 SMODE command Syntax Description SMODE mode cr Set serial line start up operating mode Available modes STOP No a...

Страница 41: ...Com1 Baud rate 19200 Com1 Parity N Com1 Data bits 8 Com1 Stop bits 1 Example set serial line to 9600 baud even 7 data bits and 1 stop bit seri 9600 e 7 1 OK seri Com1 Baud rate 9600 Com1 Parity E Com1...

Страница 42: ...librating GMP231 using serial line commands see Calibration and adjustment page 71 Make sure that the environmental compensation settings of the GMP231 are properly set for your calibration environmen...

Страница 43: ...ts Example show current user adjustment status no adjustment done pass 1300 cco2 1 Ref point low 0 1 Meas point low 0 2 Ref point low 200000 2 Meas point low 200000 Gain 1 0000 Offset 0 0000 Example o...

Страница 44: ...acters If you want to use spaces in the string enclose the text in quotes Example shows the text Calibrated at followed by the currently stored calibration text pass 1300 ctext Calibrated at Vaisala E...

Страница 45: ...orm an offset correction to the internal pressure measurement pressure Correct pressure in hectopascals hPa CP reset cr Clear the offset adjustment from internal pressure measurement Example adjust th...

Страница 46: ...Lower limit of channel scaling in ppm highlimit High limit of channel scaling in ppm Example change channel scaling to 0 5 pass 1300 asel 1 co2 0 50000 Aout 1 quantity CO2 0 50000 Table 36 AMODE comm...

Страница 47: ...w the behavior of the analog output when the measured value is outside the scaled output range channel Analog output channel only 1 can be selected AOVER channel clip valid cr Set the behavior of the...

Страница 48: ...ns scaled to 0 50000 ppm Error limit is 10 which means the output will show the error state 23 mA when the measured value is 10 outside the scaled output range With the settings above this will happen...

Страница 49: ...s advanced serial commands You can use advanced commands until the next reset code Code for enabling advanced commands 1300 Example pass 1300 Table 40 OPEN command Syntax Description OPEN address cr C...

Страница 50: ...of the I2C interface Example showing normal status no active errors errs NO CRITICAL ERRORS NO ERRORS NO WARNINGS STATUS NORMAL Example showing probe in standby mode no active errors errs NO CRITICAL...

Страница 51: ...s factory configuration All user settings are lost After using the FRESTORE command reset the probe using the RESET command Example pass 1300 frestore Parameters restored to factory defaults reset GMP...

Страница 52: ...with power supply There are small pull up resistors for SCL and SDA Connector is 8 pin male M12 Maximum cable length should not exceed 5 m and maximum capacitance between communication lines and grou...

Страница 53: ...GMP231 Device Address 0 0 0 0 1 0 0 1 MSB Device type Sub address Make sure that there are no addressing conflicts if other I2C devices are put on the same bus The GMP231 address can be changed More i...

Страница 54: ...lid the message is rejected and the internal state of the GMP231 is set to Idle When the response message is transmitted the checksum is calculated using bytes from the status byte to the last byte of...

Страница 55: ...am memory corrupted CRC error Fatal error contact Vaisala 1 Critical Error Parameter memory corrupted CRC error Fatal error contact Vaisala 2 Reserved 3 Reserved 4 Error Low supply voltage error Check...

Страница 56: ...e set by user command Set to normal mode when desired 26 Status CO2 adjustment state on Complete the CO2 adjustment 27 Reserved 28 Reserved 29 Reserved 30 Reserved 31 Reserved More information Status...

Страница 57: ...d set version 1 byte Parameter set version Checksum 2 bytes See Checksum page 52 5 2 2 Get_Parameter Get_Parameter command ID 81hex reads parameter values You can use it to read both measurement resul...

Страница 58: ...h 07hex 39hex Data 1 byte ID of parameter 1 50 bytes Value of parameter If requested parameter ID is unknown these data bytes are left out of the response Checksum 2 bytes See Checksum page 52 5 2 2 1...

Страница 59: ...GMP231 may not change immediately The length of the invoke message varies depending on the data length The master must write as many bytes as indicated in the frame length of the invoke message If th...

Страница 60: ...See Table 46 page 51 Frame length 1 byte Always 08hex Data 1 byte Parameter ID 1 byte Return code See the following table Checksum 2 bytes See Checksum page 52 Table 57 Set_Parameter return codes Cod...

Страница 61: ...tion 13 I2C address read 04 GMP231 Status byte error active ACK 82 Set_parameter command 09 Device address 08 Frame length 10 Parameter ID of compensation temperature 00 Return code Ok D1 CRC high CE...

Страница 62: ...age 51 Command ID 1 byte Always 83hex Device address 1 byte See Table 46 page 51 Frame length 1 byte Data 1 byte Parameter ID 1 byte Parameter datatype See the following table 1 byte Parameter length...

Страница 63: ...ddress 1 byte See Table 46 page 51 Frame length 1 byte Varies according to data length 07hex 0Bhex Data 1 byte Adjustment subcommand See Table 65 page 62 1 byte Parameter to be adjusted See Table 66 p...

Страница 64: ...eference value is given in parameter 4 Cancel adjustment previous adjustment is reverted 5 End adjustment is saved and new values are taken in use 6 Revert to factory calibration clear user adjustment...

Страница 65: ...nvironment and wait until the measurement has stabilized 3 Using the Adjust command record the measured point and give the reference value 4 Use the Adjust command to end the adjustment 5 3 2 2 point...

Страница 66: ...e 0 65535 Long integer 4 Value range 2 147 483 648 2 147 483 647 Unsigned long integer 4 Value range 0 4 294 967 295 Float 4 According to IEEE 754 Nan 7FC00000hex is returned if no value is available...

Страница 67: ...e Day ADATED 7 1 Byte R Yes Example 29 General parameters and variables Device status word STATUS 8 4 Str R No See Status word page 52 CO2 measurement mode CO2_MODE 9 1 Byte R W Yes 0 Standby mode Mea...

Страница 68: ...re T_COMP 16 4 Float R W No Celsius Measured temperature internal sensor T 17 4 Float R No Celsius Pressure compensation mode PC_MODE 18 1 Byte R W Yes 0 Compensation off 1 Use pressure setpoint value...

Страница 69: ...O2 point 2 CO2_RP2 27 4 Float R W Yes ppm CO2 Measured CO2 point 2 CO2_MP2 28 4 Float R Yes ppm CO2 Reference temperature point 1 T_RP1 29 4 Float R W Yes Celsius 0 C Measured temperature point 1 T_MP...

Страница 70: ...W Yes ppm CO2 Analog output scale high 20 mA A_HI 38 4 Float R W Yes ppm CO2 Other Persistent compensation values used if volatile values are not given Compensation temperature T_COMP2 39 4 Float R W...

Страница 71: ...he optical surfaces of the sensor in any other manner CAUTION More information Changing the filter page 69 Changing the silicone plug page 70 6 1 1 Chemical tolerance GMP231 tolerates the following st...

Страница 72: ...igns of contamination It is best to replace the filter also 1 Pull the white PTFE filter away from the sensor Rotating the filter slightly makes it easier to detach 2 Lift one edge of the plug and pul...

Страница 73: ...that affect the result Performing an accurate calibration and adjustment takes some time and preparation Instead of doing it yourself contact Vaisala Calibration means comparing GMP231 to a known refe...

Страница 74: ...1 point calibration with the background CO2 level as your reference You need a calibrated reference instrument to compare against for example a GM70 hand held meter with a calibrated GMP222 probe With...

Страница 75: ...en free For example pure nitrogen gas is typically used as a convenient 0 ppm CO2 reference Remember to restore the normal compensation settings after completing calibration and adjustment If you are...

Страница 76: ...using the Get_Parameter and Set_Parameter commands More information Get_Parameter page 55 Set_Parameter page 57 Adjust page 61 6 4 4 2 Vaisala Industrial Protocol Vaisala industrial protocol supports...

Страница 77: ...1 can remain physically connected to the incubator 2 If the MI70 indicator is on turn it off 3 Connect GMP231 to the MI70 indicator using the GMP231 service cable for MI70 4 Turn on the MI70 indicator...

Страница 78: ...ompensation settings from Main menu Settings Measurement settings Figure 18 GMP231 compensation settings on MI70 screen When you turn a compensation off GMP231 still shows a value for the correspondin...

Страница 79: ...1 point adjustment with an MI70 compatible reference probe 1 Connect the GMP231 to Port I of the MI70 indicator 2 Connect the calibrated reference probe to Port II Make sure the reference probe is in...

Страница 80: ...e measured CO2 readings and their difference on the screen Allow the measurement to stabilize To proceed with the adjustment press Adjust 10 Select To same as CO2 II 11 You are prompted if you really...

Страница 81: ...t sequence from Main menu Functions Adjustments 5 MI70 notifies you that automatic power off is disabled during adjustment mode press OK to acknowledge 6 Select the CO2 parameter when prompted 7 You m...

Страница 82: ...the adjustment is successful MI70 shows the text Adjustment Done after which you return to the adjustment mode At this point you can press Back and Exit to leave the adjustment mode The adjustment is...

Страница 83: ...probe on RS 485 line Incorrect wiring Check that the RS 485 connection is wired correctly Power cycle or reset the probe and try again Probe in POLL mode with unknown address Issue the command to make...

Страница 84: ...de the scaled output range The default error level depends on the output type For 4 20 mA output the default error level is 3 6 mA For 0 20 mA output the default error level is 23 mA The probe resumes...

Страница 85: ...O2 12 20 CO2 0 4 CO2 Non linearity at 0 20 CO2 0 1 CO2 Temperature dependence With compensation at 3 12 CO2 20 60 C 0 1 CO2 Without compensation typical 0 4 of reading C Pressure dependence With compe...

Страница 86: ...rage temperature 40 75 C 40 167 F Pressure compensated 500 1100 hPa Pressure operating 1500 hPa Humidity 0 100 non condensing Condensation prevention Sensor head heating when power on Chemical toleran...

Страница 87: ...n diameter 24 8 mm 0 98 in Probe tube length 118 5 mm 4 67 in Sensor filter diameter 19 mm 0 75 in Sensor filter length 12 mm 0 47 in 9 2 Spare parts and accessories Table 75 Spare parts and accessori...

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Страница 89: ...licable supply contract or Conditions of Sale for details of the warranty for each product Technical support Contact Vaisala technical support at helpdesk vaisala com Provide at least the following su...

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Страница 92: ...www vaisala com...

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