Vaisala CARBOCAP GMP231 User manual

USER'S GUIDE
Vaisala CARBOCAP® Carbon Dioxide Probe
GMP231
ZZZYDLVDODQWUWUX

ɉɨɜɨɩɪɨɫɚɦɩɪɨɞɚɠɢɩɨɞɞɟɪɠɤɢɨɛɪɚɳɚɣɬɟɫɶ
ȼɨɥɝɨɝɪɚɞȼɨɪɨɧɟɠȿɤɚɬɟɪɢɧɛɭɪɝɄɚɡɚɧɶ
ɄɪɚɫɧɨɞɚɪɄɪɚɫɧɨɹɪɫɤɆɨɫɤɜɚɇɢɠɧɢɣɇɨɜɝɨɪɨɞ
ɇɨɜɨɫɢɛɢɪɫɤɊɨɫɬɨɜɧɚȾɨɧɭɋɚɦɚɪɚ
ɋɚɧɤɬɉɟɬɟɪɛɭɪɝɋɚɪɚɬɨɜɍɮɚ
ȿɞɢɧɵɣɚɞɪɟɫYVD#QWUWUX
ZZZYDLVDODQWUWUX

_________________________________________________________________________________
VAISALA_________________________________________________________________________ 1
Table of Contents
CHAPTER 1
GENERAL INFORMATION............................................................................7
About This Manual...................................................................7
Contents of This Manual .......................................................7
Version Information...............................................................8
Related Manuals ...................................................................8
Documentation Conventions.................................................8
Safety......................................................................................... 9
ESD Protection......................................................................9
Recycling .................................................................................. 9
Regulatory Compliances .......................................................10
Patent Notice ..........................................................................10
Trademarks.............................................................................10
Software License....................................................................10
Warranty..................................................................................11
CHAPTER 2
PRODUCT OVERVIEW................................................................................12
Introduction to GMP231.........................................................12
Basic Features and Options..................................................13
GMP231 Parts ......................................................................... 14
Operating Principle of CO2Measurement............................15
Environmental Compensation ..............................................17
Pressure Compensation......................................................17
Temperature Compensation ...............................................17
Background Gas Compensations .......................................18
Probe Startup..........................................................................18
Analog Output Overrange Behavior.....................................19
CHAPTER 3
INSTALLATION............................................................................................20
Thermal Management ............................................................20
Avoiding Condensation.........................................................21
Probe Installation Depth........................................................21
Dimensions.............................................................................22
Recommended Installation ...................................................23
Wiring ......................................................................................24
Power Supply..........................................................................24
CHAPTER 4
VAISALA INDUSTRIAL PROTOCOL..........................................................25
Overview .................................................................................25

User's Guide _______________________________________________________________________
2 ____________________________________________________________________ M211501EN-C
Physical Interface...................................................................25
Connecting with a Computer.................................................26
Installing the Driver for the USB Service Cable .............26
Terminal Application Settings.........................................27
Serial Commands ...................................................................28
Showing Device Information .................................................29
Show Probe Information......................................................29
Show Serial Number............................................................30
Show Firmware Version ......................................................30
Show Firmware Information ................................................30
Show Probe Uptime.............................................................30
Show Command List ...........................................................31
Serial Line Output Commands..............................................31
Start Measurement Output..................................................31
Stop Measurement Output ..................................................32
Set Output Interval...............................................................32
Output a Reading Once.......................................................32
Set Measurement Output Format........................................33
FORM Command Examples ..........................................34
Changing Measurement Settings..........................................35
Set Compensation Modes...................................................35
Change Compensation Setpoint Values .............................36
Set Measurement to Standby Mode....................................37
Configuring Serial Line Operation........................................38
Set Serial Line Operating Mode ..........................................38
Set Serial Line Settings.......................................................39
Set Probe Address ..............................................................39
Set Serial Line Response Time...........................................40
Set Serial Line Echo.......................................................40
Calibration Commands ..........................................................41
Adjust CO2Measurement....................................................41
Set Calibration Date ............................................................42
Set Calibration Info Text......................................................43
Adjust Temperature Measurement......................................43
Adjust Pressure Measurement............................................44
Configuring Analog Output ...................................................45
Set Analog Output Scaling ..................................................45
Set Analog Output Mode.....................................................45
Set Analog Output Clipping and Error Limit ........................46
Test Analog Output..............................................................47
Other Commands....................................................................47
Enable Advanced Commands.............................................47
Connecting to Probe in POLL Mode....................................48
Closing the Connection to a Probe in POLL Mode .............48
Show Active Errors..............................................................48
Reset Probe.........................................................................49
Restore Factory Settings.....................................................49
CHAPTER 5
I2C INTERFACE............................................................................................50
Overview..................................................................................50
Physical Interface................................................................50
Communication Parameters................................................51
Addressing...........................................................................51

_________________________________________________________________________________
VAISALA_________________________________________________________________________ 3
Communication Flow.............................................................52
GMP231 State Machine......................................................53
Examples of Communication Flow......................................54
Timing..................................................................................56
Status Byte..........................................................................56
Checksum ...........................................................................56
Status Word.........................................................................57
Commands..............................................................................58
Get_Interface_Version ........................................................58
Get_Parameter....................................................................59
Example: Read CO2Measurement Result ....................60
Set_Parameter....................................................................61
Example: Set Compensation Temperature.........................62
Get_Parameter_Info............................................................63
Adjust ..................................................................................64
Adjusting Measurement.........................................................65
One Point Adjustment.........................................................65
Two Point Adjustment.........................................................66
Data Registers ........................................................................66
Data Formats.......................................................................66
Register Table.....................................................................67
CHAPTER 6
MAINTENANCE ...........................................................................................70
Cleaning ..................................................................................70
Chemical Tolerance ............................................................70
Changing the Filter.................................................................71
Changing the Silicone Plug...................................................72
Calibration and Adjustment ..................................................73
Calibration Setup.................................................................73
Using Ambient Air as Reference....................................74
Using a Calibration Gas as Reference...........................74
Effect of Environmental Compensations.............................74
Limits of Adjustment............................................................75
Adjustment Types ...............................................................75
I2C Interface ...................................................................76
Vaisala Industrial Protocol .............................................76
MI70 Hand-Held Indicator..............................................76
CHAPTER 7
OPERATING WITH MI70 INDICATOR ........................................................77
Overview of MI70 Support.....................................................77
Connecting GMP231 to MI70 Indicator.................................77
Changing Environmental Compensation Settings with MI70
Indicator ..................................................................................78
Calibration and Adjustment with MI70 Indicator.................79
1-Point Adjustment with an MI70-Compatible Reference
Probe...................................................................................79
1-Point Adjustment with a Reference Gas..........................81
CHAPTER 8
TROUBLESHOOTING .................................................................................83
Problem Situations.................................................................83

User's Guide _______________________________________________________________________
4 ____________________________________________________________________ M211501EN-C
Analog Output Error State.....................................................84
Technical Support ..................................................................84
Product Returns......................................................................84
CHAPTER 9
TECHNICAL DATA ......................................................................................85
Specifications .........................................................................85
Spare Parts and Accessories................................................87

_________________________________________________________________________________
VAISALA_________________________________________________________________________ 5
List of Figures
Figure 1 GMP231 Installed Through a Chamber Wall (Example)..........12
Figure 2 GMP231 Parts..........................................................................14
Figure 3 CARBOCAP®Sensor of the GMP231......................................15
Figure 4 CO2Measurement Inside the Incubator...................................16
Figure 5 Probe Installation Depth...........................................................21
Figure 6 Probe Dimensions without Silicone Plug..................................22
Figure 7 Probe Dimensions with Silicone Plug.......................................22
Figure 8 Electronics Housing Dimensions..............................................22
Figure 9 Attachment Bracket Dimensions..............................................22
Figure 10 Recommended Installation.......................................................23
Figure 11 PuTTY Terminal Application.....................................................27
Figure 12 Hardware Schematic................................................................50
Figure 13 GMP231 State Machine...........................................................54
Figure 14 Get_Parameter with ACK.........................................................54
Figure 15 Set_Parameter with ACK .........................................................55
Figure 16 Get_Parameter with NACK ......................................................55
Figure 17 Get_Parameter with Alarm.......................................................55
Figure 18 Changing the Filter...................................................................71
Figure 19 Changing the Silicone Plug......................................................72
Figure 20 Inserting the Calibration Adapter over the Filter ......................73
Figure 21 CO2Reading on MI70 Screen..................................................77
Figure 22 CO2Reading with Tcomp and Pcomp on MI70 Screen...........78
Figure 23 GMP231 Compensation Settings on MI70 Screen ..................78
Figure 24 Functions Menu........................................................................79
Figure 25 Comparing Readings in MI70 Adjustment Mode .....................80
Figure 26 Selecting the Adjustment Mode ...............................................80
Figure 27 Functions Menu........................................................................81
Figure 28 MI70 Adjustment Mode ............................................................81
Figure 29 Selecting the Adjustment Mode ...............................................82
Figure 30 Entering the Reference CO2Concentration.............................82

User's Guide _______________________________________________________________________
6 ____________________________________________________________________ M211501EN-C
List of Tables
Table 1 Manual Revisions .......................................................................8
Table 2 Related Manuals.........................................................................8
Table 3 Applicable Patents....................................................................10
Table 4 GMP231 Connector Pinout.......................................................24
Table 5 Cable DRW240977...................................................................24
Table 6 Default Serial Interface Settings...............................................25
Table 7 Basic Serial Commands...........................................................28
Table 8 Advanced Serial Commands....................................................29
Table 9 FORM Command Parameters..................................................33
Table 10 FORM Command Modifiers......................................................33
Table 11 Selection of Output Modes .......................................................38
Table 12 GMP231 I2C Address ...............................................................51
Table 13 GMP231 Device Address .........................................................51
Table 14 Invoke Message in GMP231 I2C Interface ...............................52
Table 15 Response Message in GMP231 I2C Interface..........................53
Table 16 Timing.......................................................................................56
Table 17 Status Byte ...............................................................................56
Table 18 Status Word Content ................................................................57
Table 19 Get_Interface_Version Invoke Message ..................................58
Table 20 Get_Interface_Version Response Message.............................58
Table 21 Get_Parameter Invoke Message..............................................59
Table 22 Get_Parameter Response Message........................................59
Table 23 Get_Parameter Invoke Message Example...............................60
Table 24 Get_Parameter Response Message Example.........................60
Table 25 Set_Parameter Invoke Message..............................................61
Table 26 Set_Parameter Response Message.........................................61
Table 27 Set_Parameter Return Codes..................................................61
Table 28 Example Set_Parameter Invoke Message...............................62
Table 29 Example Set_Parameter Response Message .........................62
Table 30 Get_Parameter_Info Invoke Message......................................63
Table 31 Get_Parameter_Info Response Message................................63
Table 32 Parameter Data Types .............................................................63
Table 33 Parameter Persistence.............................................................63
Table 34 Adjust Invoke Message ............................................................64
Table 35 Adjust Response Message.......................................................64
Table 36 Adjustment Subcommands.......................................................64
Table 37 Adjustment Parameters............................................................64
Table 38 Adjustment Return Codes ........................................................65
Table 39 Data Formats............................................................................66
Table 40 GMP231 Register Table...........................................................67
Table 41 Possible Problem Situations and Their Remedies...................83
Table 42 Performance.............................................................................85
Table 43 Operating Environment.............................................................86
Table 44 Inputs and Outputs ...................................................................86
Table 45 Mechanics.................................................................................86
Table 46 Spare Parts and Accessories for GMP231...............................87

Chapter 1 _________________________________________________________ General Information
VAISALA_________________________________________________________________________ 7
CHAPTER 1
GENERAL INFORMATION
This chapter provides general notes for the manual and the GMP231
probe.
About This Manual
This manual provides information for installing, operating, and
maintaining the Vaisala CARBOCAP®Carbon Dioxide Probe GMP231.
Contents of This Manual
This manual consists of the following chapters:
- Chapter 1, General Information, provides general notes for the manual
and the GMP231 probe.
- Chapter 2, Product Overview, introduces the GMP231 probe and its
features.
- Chapter 3, Installation, provides you with information that is intended
to help you install the GMP231.
- Chapter 4, Vaisala Industrial Protocol, describes the Vaisala Industrial
Protocol implementation of the GMP231.
- Chapter 5, I2C Interface, describes the I2C interface implementation
of the GMP231.
- Chapter 6, Maintenance, provides information that is needed in the
basic maintenance of the GMP231.
- Chapter 8, Troubleshooting, describes possible problems, their
probable causes and remedies, and provides contact information for
technical support.
- Chapter 9, Technical Data, provides the technical data of the
GMP231.

User's Guide _______________________________________________________________________
8 ____________________________________________________________________ M211501EN-C
Version Information
Table 1 Manual Revisions
Manual Code Description
M211501EN-C May 2014. This manual. Updated description for
ENV command in section Change Compensation
Setpoint Values on page 36.
M211501EN-B Previous version. Applicable from software version
1.1.0 onward. Added instructions for operation with
the MI70 hand-held indicator. Updated description
of I2C interface and Vaisala Industrial Protocol.
Updated description of environmental
compensations. Updated instructions for calibration
and adjustment. Updated technical specification.
M211501EN-A September 2013. First version.
Related Manuals
Table 2 Related Manuals
Manual Code Manual Name
M211603EN GMP231 Quick Guide
Documentation Conventions
Throughout the manual, important safety considerations are highlighted
as follows:
WARNING Warning alerts you to a serious hazard. If you do not read and follow
instructions very carefully at this point, there is a risk of injury or even
death.
CAUTION Caution warns you of a potential hazard. If you do not read and follow
instructions carefully at this point, the product could be damaged or
important data could be lost.
NOTE Note highlights important information on using the product.

Chapter 1 _________________________________________________________ General Information
VAISALA_________________________________________________________________________ 9
Safety
The GMP231 probe delivered to you has been tested for safety and
approved as shipped from the factory. Note the following precautions:
WARNING When returning a product for calibration or repair, make sure it has not
b
een exposed to dangerous contamination, and is safe to handle without
special precautions.
CAUTION Do not modify the unit. Improper modification can damage the product
or lead to malfunction.
CAUTION Do not open the probe housing. There are no user serviceable parts
inside.
ESD Protection
Electrostatic Discharge (ESD) can cause immediate or latent damage to
electronic circuits. Vaisala products are adequately protected against
ESD for their intended use. It is possible to damage the product,
however, by delivering an electrostatic discharge when touching an
exposed contact on the product.
To make sure you are not delivering high static voltages yourself, avoid
touching the pins on the M12 connector.
Recycling
Recycle all applicable material.
Dispose of the unit according to statutory regulations. Do not dispose of
with regular household refuse.

User's Guide _______________________________________________________________________
10 ___________________________________________________________________ M211501EN-C
Regulatory Compliances
GMP231 is in conformity with the provisions of the following
EU directives:
- EMC-Directive
- RoHS-Directive
Conformity is shown by compliance with the following standards:
- EN 61326-1: Electrical equipment for measurement, control, and
laboratory use – EMC requirements – Generic environment.
- EN 550022: Information technology equipment – Radio disturbance
characteristics – Limits and methods of measurement.
Patent Notice
GMP231 is protected by the following patents and their corresponding
national rights:
Table 3 Applicable Patents
Patent Issued By Patent Number
United States Patent and Trademark Office US 5,827,438
US 6,177,673
European Patent Office EP0776023
EP0922972
German Patent and Trade Mark Office 69615635
Japan Patent Office 4263285
Finnish Patent Office 112005
105598
Trademarks
CARBOCAP®is a registered trademark of Vaisala Oyj.
All other trademarks are the property of their respective owners.
Software License
This product contains software developed by Vaisala. Use of the software
is governed by license terms and conditions included in the applicable
supply contract or, in the absence of separate license terms and
conditions, by the General License Conditions of Vaisala Group.

Chapter 1 _________________________________________________________ General Information
VAISALA________________________________________________________________________ 11
Warranty
Visit our Internet pages for standard warranty terms and conditions:
www.vaisala.com/warranty.
Please observe that any such warranty may not be valid in case of
damage due to normal wear and tear, exceptional operating conditions,
negligent handling or installation, or unauthorized modifications. Please
see the applicable supply contract or Conditions of Sale for details of the
warranty for each product.

User's Guide _______________________________________________________________________
12 ___________________________________________________________________ M211501EN-C
CHAPTER 2
PRODUCT OVERVIEW
This chapter introduces the GMP231 probe and its features.
Introduction to GMP231
The Vaisala CARBOCAP® Carbon Dioxide Probe GMP231 is designed
for incubator manufacturers requiring accurate and reliable carbon
dioxide measurements and sterilization durability at high temperatures.
The GMP231 probe is based on Vaisala’s patented CARBOCAP®
technology and a new type of infra-red light source. The probe can
remain in place during high-temperature sterilization cycles that heat 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 insulated.
Sensor performance is optimized at 5 %CO2measurement. GMP231 also
has an internal pressure sensor, which allows compensation of the
measurement according to ambient pressure. Since dust and most
chemicals do not affect the measurement, and the effect of water vapor
can be compensated for, GMP231 is accurate and stable at CO2incubator
conditions.
1403-144
Figure 1 GMP231 Installed Through a Chamber Wall (Example)

Chapter 2 ___________________________________________________________Product Overview
VAISALA________________________________________________________________________ 13
Basic Features and Options
- CO2measurement range 0 ... 20 %CO2.
- Temperature durability in standby mode up to 195 °C (383 °F). See
section Thermal Management on page 20.
- Vaisala CARBOCAP®CO2sensor with excellent long-term stability.
See sections Operating Principle of CO2Measurement on page 15 and
Specifications on page 85.
- Measurement compensated for effects of pressure, temperature, and
background gas. Pressure compensation based on integrated pressure
sensor. See section Environmental Compensation on page 17.
- Heating to avoid condensation on optical elements.
- Analog output: one current output channel (0 ... 20 mA or 4 ... 20 mA).
- Digital output:
- I2C.
- RS-485 (non-isolated) with Vaisala Industrial Protocol.

User's Guide _______________________________________________________________________
14 ___________________________________________________________________ M211501EN-C
GMP231 Parts
1403-153
Figure 2 GMP231 Parts
1 = Electronics housing. Contains the main component board,
including the digital pressure sensor.
2 = Holes for M4 screws on both sides of the housing.
Maximum screw depth 8 mm. Two screws included, type
BN 10649 M4.
3 = Type label on housing cover (not shown).
4 = 8-pin M12 connector. For pinout, see Table 4 on page 24.
5 = Probe body.
6 = Measurement cuvette with optics and CARBOCAP
®
CO2sensor.
7 = PTFE filter.
8 = Silicone plug for sealing the lead-through.
Recommended accessory, suitable for ႇ 44 mm lead-throughs.
CAUTION Do not open the electronics housing; there are no user serviceable parts
inside. All wiring is done through the M12 connector (4).
3
2
4
1
5678

Chapter 2 ___________________________________________________________Product Overview
VAISALA________________________________________________________________________ 15
Operating Principle of CO2Measurement
The Vaisala CARBOCAP®sensor that is used in the GMP231 is a silicon-
based, non-dispersive infrared (NDIR) sensor for the measurement of
gaseous carbon dioxide. It is especially designed to tolerate high
temperatures in standby mode, up to 195 °C (383 °F). This allows it to be
used in applications that utilize high temperature for heat sterilization. The
operating temperature range of the sensor is 0 … +70 °C (+32 ... +158 °F).
1 = Cuvette.
2 = Mirror.
3 = Window.
4 = Sensor chips.
1403-160
Figure 3 CARBOCAP®Sensor of the GMP231
The sensitivity to carbon dioxide is based on absorption of infrared light
at a characteristic wavelength. The light is emitted by a novel, silicon-
based microchip emitter into the cuvette which contains the gas to be
measured. After reflection from the mirror, the light intensity is measured
with a thermopile chip at a wavelength chosen by a micromechanical
Fabry–Pérot interferometer (FPI) and a band pass filter. A hermetically
sealed sapphire window is used to protect the sensor chips from moisture
and contamination. A heater chip is utilized to prevent condensation in
normal operation.
The carbon dioxide measurement consists of two steps: First, the FPI is
electrically tuned so that its pass band coincides with the characteristic
absorption wavelength of carbon dioxide and the signal is recorded.
Second, the pass band is shifted to a wavelength where no absorption
occurs in order to get a reference signal. The ratio of these two signals,
one at the absorption wavelength and the other at the reference
wavelength, gives the fraction of light absorption from which the carbon
dioxide concentration is calculated. The reference signal compensates the
possible effects of sensor aging and signal attenuation due to dirt on
optical surfaces, making the sensor very stable over time.
2
3
4
1

User's Guide _______________________________________________________________________
16 ___________________________________________________________________ M211501EN-C
1403-161
Figure 4 CO2Measurement Inside the Incubator
1 = Chamber wall.
2 = Chamber interior.
3 = Light source.
4 = Band pass filter.
5 = Ambient air (400 ... 1000 ppm CO2).
6 = Light absorbed by CO2in the incubator gas.
7 = Thermopile detector.
8 = Fabry-Perot interferometer.
9 = Sapphire window. Separates the sensor’s active components
from the measured environment.
10 = Gold-plated mirror.
12
34
56
78910

Chapter 2 ___________________________________________________________Product Overview
VAISALA________________________________________________________________________ 17
Environmental Compensation
GMP231 improves the CO2measurement accuracy by applying various
environmental compensations. GMP231 compensates for the effects of:
- Pressure
- Temperature
- Background gas oxygen (O2) content
- Background gas relative humidity (%RH)
Compensation parameters are configured on the order form when
ordering the probe, and can later be updated using serial commands,
MI70 Indicator, or I2C protocol. If the probe is integrated in a system that
measures one or more of the compensation parameters, they can be
updated to the probe continuously.
You can also turn off any of the compensations. In that case, GMP231
uses the default compensation value that is mathematically neutral for the
probe’s internal compensation model.
For the effect of the compensations on measurement accuracy, refer to
Table 42 on page 85.
Pressure Compensation
There is a pressure sensor on the component board of the GMP231 that
provides a live measurement of ambient pressure. GMP231 can
compensate the CO2measurement based on this pressure reading, or it
can use a fixed setpoint. Using the GMP231’s own sensor is
recommended for most applications.
If pressure compensation is turned off, GMP231 uses the default
compensation value of 1013.2 hPa.
Temperature Compensation
GMP231 can measure the approximate temperature of the CARBOCAP®
sensor for compensation, or use a fixed setpoint. The temperature
measurement is accurate enough to be useful for compensation, 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
value of +37 °C (+98.6 °F).

User's Guide _______________________________________________________________________
18 ___________________________________________________________________ M211501EN-C
Background Gas Compensations
Compensation for background gas parameters are based on setpoint
values only, as GMP231 has no internal measurement for oxygen
concentration or humidity. The default setpoint values are as follows:
- Oxygen concentration: 19.7 %O2.
- Relative humidity: 93 %RH.
If background gas compensations are turned off, GMP231 uses the value
0% for both.
Probe Startup
When powered on, GMP231 starts up within 10 seconds. Measurements
from the outputs (digital and analog) become available during this time
but note that they will only reach specified accuracy after a one minute
warm-up period. For this reason, you should design the incubator’s
control system so that it does not rely on measurements from GMP231
during this time.
NOTE Specifically note that the CO2reading will rise to the correct reading as
the sensor’s infrared emitter achieves operation temperature.