USER'S GUIDE Vaisala CARBOCAP® Carbon Dioxide Transmitter Series GMT220 M010022EN-F
PUBLISHED BY Vaisala Oyj P.O. Box 26 FI-00421 Helsinki Finland Phone (int.): +358 9 8949 1 Fax: +358 9 8949 2227 Visit our Internet pages at www.vaisala.com. © Vaisala 2012 No part of this manual may be reproduced, published or publicly displayed in any form or by any means, electronic or mechanical (including photocopying), nor may its contents be modified, translated, adapted, sold or disclosed to a third party without prior written permission of the copyright holder.
________________________________________________________________________________ Table of Contents CHAPTER 1 GENERAL INFORMATION............................................................................ 5 About This Manual ................................................................... 5 Contents of This Manual ....................................................... 5 Version Information ............................................................... 5 Related Manuals ...............................
USER'S GUIDE____________________________________________________________________ CHAPTER 5 MAINTENANCE............................................................................................27 Replacing the Probe...............................................................27 Transmitter with Integrated Probe (Wall Model)..................27 Transmitter with Remote Probe...........................................27 Check and Calibration............................................................
Chapter 1 ________________________________________________________ General Information CHAPTER 1 GENERAL INFORMATION This chapter provides general notes for the manual and the Carbon Dioxide Transmitter Series GMT220. About This Manual This manual provides information for installing, operating, and maintaining Carbon Dioxide Transmitter Series GMT220.
USER'S GUIDE____________________________________________________________________ Related Manuals Table 2 Related Manuals Manual Code M010139EN Manual Name Vaisala CARBOCAP® Hand-Held Carbon Dioxide Meter GM70 User's 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.
Chapter 1 ________________________________________________________ General Information 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 electrostatic discharges when touching, removing, or inserting any objects inside the equipment housing.
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Chapter 2 __________________________________________________________ Product Overview CHAPTER 2 PRODUCT OVERVIEW This chapter introduces the Carbon Dioxide Transmitter Series GMT220. GMT220 Transmitter Parts Vaisala’s GMT220 transmitters are versatile instruments for measuring CO2 in industrial applications. The CARBOCAP® sensor is silicon based and its operation is based on the NDIR Single-Beam Dual-Wavelength principle.
USER'S GUIDE____________________________________________________________________ 0807-033 Figure 2 GMT220 with Probe Installed Remotely The following numbers refer to Figure 2 above: 7 8 9 10 11 12 13 14 = = = = = = = = Remote probe (interchangeable) Probe cable (2m or 10m) Clamping sleeve Cable clamp Pin connector for an optional serial COM adapter Probe mounting clips (optional) Mounting flange (optional) Fixing screws (4 pcs) 10 __________________________________________________________________ M0
Chapter 2 __________________________________________________________ Product Overview LED Indicators and Optional Display The GMT220 series transmitter has, as a standard, three LED light indicators on the cover plate: OPERATION, LEVEL 1 and LEVEL 2 (see Figure 3). - The green OPERATION LED is lit when the power is connected. - The red LEVEL LEDS are lit if the relay setting is reached, for example when CO2 concentration is over the predefined limit.
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Chapter 3 _______________________________________________________________ Installation CHAPTER 3 INSTALLATION This chapter provides you with information that is intended to help you install this product. Wall Mounting Mount the wall model transmitter or the remote probe into a place representing the environment to be measured. 0807-035 Figure 4 Mounting the Transmitter The following numbers refer to Figure 4 above: 1 2 = = Attach the mounting plate to the wall with screws.
USER'S GUIDE____________________________________________________________________ Duct or Channel Mounting When the probe is installed in a duct or channel, it is recommended to use the optional mounting flange (GM45156SP). 1. Drill a hole with minimum diameter of 22 mm in the wall. 2. Attach the flange onto the duct with four screws so that the gasket ring seals the attachment. 3. Place the probe through the flange so deep that the perforated head is completely in the duct (see Figure 5 below).
Chapter 3 _______________________________________________________________ Installation Connections To connect the GMT220: 1. Connect the nominal 24 V supply terminals (+) and (-) on the motherboard (right-hand side, see Figure 6 below). 2.
USER'S GUIDE____________________________________________________________________ The following numbers refer to Figure 6 on page 15: 1 2 3 4 5 6 7 8 = = = = = = = = Current output jumper (4 mA) Relay jumpers L1 and L2 A, B, C and D: Not intended for customer use Relay 2 terminals Relay 1 terminals Serial port Power supply terminals Output terminals Power Supply Requirements The GMT220 series transmitters are designed to operate with a nominal 24 VAC/DC supply.
Chapter 3 _______________________________________________________________ Installation 0807-038 Figure 7 AC Connections Relays The relay output wiring is done at the left-hand side terminals on the motherboard, see Figure 6 on page 15. When the relay trigger point is exceeded, the relay switches ON. This function can be inversed by disconnecting the corresponding relay jumper (L1 or L2). The relay trigger points have been set at the factory as defined in the order form.
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Chapter 4 _______________________________________________________Serial Communication CHAPTER 4 SERIAL COMMUNICATION This chapter contains information that is needed to change the Carbon Dioxide Transmitter Series GMT220 settings and to read the device status. Serial Cable Settings The GMT220 is linked to PC via a serial cable equipped with a COM adapter (optional part 19040GM, can be ordered from Vaisala).
USER'S GUIDE____________________________________________________________________ Set the serial settings according to Table 3 below. Table 3 Serial Settings Baud rate Parity Data bits Stop bits Flow control NOTE 9600 None 8 1 Xon/Xoff (none) Remember to save the settings after each command.
Chapter 4 _______________________________________________________Serial Communication Setting Relay Trigger Points The relays of the transmitter turn ON/OFF when the CO2 content reaches the predefined trigger point. For the ON/OFF selection, see section Relays on page 17. There are two trigger points for both relays. The higher limit activates the relay and the lower deactivates it. The two limits are used to prevent the relay switching back and forth when the measured value is very close to set point.
USER'S GUIDE____________________________________________________________________ Pressure Compensation For achieving the most accurate measurements in high altitudes where the barometric pressure is lower than in the sea level, the actual pressure value can be set to the GMT220's software. The factory setting is 1013 hPa. Pressure values in different altitudes are shown in Table 5 below.
Chapter 4 _______________________________________________________Serial Communication Temperature Setting The ambient temperature value can be set by using the following command: MF_TEMP xxx where: xxx = ambient temperature (C) x 10.
USER'S GUIDE____________________________________________________________________ Error States The GMT220 series transmitter goes through a continuous selfdiagnostic procedure. If any problems occur, it displays a corresponding error message. A transmitter without a display indicates errors by blinking the three LED lights on the cover. Transmitter with a display indicates error by showing an error code in the display.
Chapter 4 _______________________________________________________Serial Communication Error Indication in Transmitters without Display Error codes are cabled by blinking a message with short flashes of the LED lights. LEDs are situated on the cover of the transmitter. The green OPERATION LED is blinking when a non-critical error occurs (no effect on relays). The red LEVEL 1 and LEVEL 2 LEDs are blinking when a fatal error occurs (switches the relays OFF).
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Chapter 5 ______________________________________________________________ Maintenance CHAPTER 5 MAINTENANCE This chapter provides information that is needed in basic maintenance of the Carbon Dioxide Transmitter Series GMT220. Replacing the Probe The probe on the transmitter can be changed and replaced if necessary. Transmitter with Integrated Probe (Wall Model) To replace the integrated probe, do the following: 1. 2. 3.
USER'S GUIDE____________________________________________________________________ Check and Calibration There are three ways to check the transmitter and calibrate it. These are presented in this section. Comparison with Calibrated Probe It is recommended to check the calibration of the GMT220 every second year. A simple field calibration checking can be performed by using a calibrated reference probe.
Chapter 5 ______________________________________________________________ Maintenance On-site Checking and Adjusting with Reference Gas and GM70 Hand-Held Meter A probe to be checked can be flushed in a reference gas by using a field check adapter (optional part, 26150GM). The procedure requires pressurized gas bottle giving a flow rate of 0.4...1.0 l/min through the adapter chamber. If an adjustment is needed, it can be carried out by a user with a Vaisala's hand-held carbon dioxide meter GM70.
USER'S GUIDE____________________________________________________________________ - Flow meter - Field check adapter (Vaisala order code: 26150GM) - Flexible tubing with 3 mm (1/8 inch) inner diameter Two-Point Adjustment Procedure CAUTION Please take special care regarding the following when carrying out the adjustment: - Check that you give the correct reference concentrations in the correct units. - Check that the reading has really stabilized before accepting the reading.
Chapter 5 ______________________________________________________________ Maintenance 0505-236 Figure 11 Location of the GM70 Adjustment Button 6. Press OK to confirm the adjusting. 7. Select CO2, press 8. Press YES to give the ambient pressure and temperature values. To continue adjusting press EXIT. 9. Now the adjustment mode is on. Press GRAPH to confirm that the readings have stabilized. Go back and press ADJUST to select the adjustment method. 10. Select 2-point adjustment, press SELECT.
USER'S GUIDE____________________________________________________________________ 16. Confirm the adjustment, press YES. By pressing NO you return to adjustment mode display. (If the difference between the two references is less than 20% of the measuring range of the probe, adjustment cannot be done). 17. Adjustment is complete. Press BACK-EXIT to return to the basic display. Shut off the gas flow. Replace the screw onto the adjusting button. 18. 19.
Chapter 5 ______________________________________________________________ Maintenance 10. 11. Select 1-point adjustment, press SELECT. Press READY if the value has stabilized. Give the reference concentration value by using the arrow buttons. Examples: For a zero-point adjustment using pure nitrogen (N2) enter value 0 ppm. For other reference gases, the analyzed CO2 concentration is typically printed on the bottle. Use that value.
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Chapter 6 ____________________________________________________________ Technical Data CHAPTER 6 TECHNICAL DATA This chapter provides the technical data of the Product. Technical specifications Measuring range GMT221 GMT222 0 ... 2% CO2 0 ... 3% CO2 0 ... 5% CO2 0 ... 10% CO2 0 ... 20% CO2 0 ... 2000 ppm 0 ... 3000 ppm 0 ... 5000 ppm 0 ... 7000 ppm 0 ... 10 000 ppm Accuracy (including repeatability, non-linearity and calibration uncertainty) at 25 °C and 1013 hPa GMT221 ± (1.
USER'S GUIDE____________________________________________________________________ Inputs and outputs Outputs 0 ... 20 mA or 4 ... 20 mA and 0 ... 10 V Resolution of analog outputs 12 bits Recommended external load current output max. 400 voltage output min. 1 k Two pre-or user-defined relay outputs Relay contacts max. 30 VAC / 60 VDC, 0.5 A Operating voltage nominal 24 VAC/DC Power consumption <4W Connections screw terminals, wire size 0.5 ... 1.
Chapter 6 ____________________________________________________________ Technical Data Electromagnetic compatibility The GMT221 and GMT222 transmitters comply with the following standards: EN 61326-1, Electrical equipment for measurement, control and laboratory use - EMC requirements - Generic environment. [CISPR16/22 Class B, EN/IEC 61000-4-2, EN/IEC 61000-4-3, EN/IEC 61000-4-4, EN/IEC 61000-4-5, EN/IEC 61000-4-6] Accessories Description Spare probe (use the order form to define measurement range etc.
USER'S GUIDE____________________________________________________________________ Dimensions in mm (inches) 0807-040 Figure 12 Transmitter 38 __________________________________________________________________ M010022EN-F
Chapter 6 ____________________________________________________________ Technical Data 0807-041 Figure 13 Mounting Plate 0807-042 Figure 14 Probe GMP221 VAISALA _______________________________________________________________________ 39
USER'S GUIDE____________________________________________________________________ 0807-043 Figure 15 Probe GMP222 0807-044 Figure 16 Mounting Flange GM45156SP 40 __________________________________________________________________ M010022EN-F
Chapter 6 ____________________________________________________________ Technical Data VAISALA _______________________________________________________________________ 41
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