Vaisala CARBOCAP GMT220 SERIES User manual

USER'S GUIDE
Vaisala CARBOCAP® Carbon Dioxide
Transmitter Series
GMT220
M010022EN-E

PUBLISHED BY
Vaisala Oyj Phone (int.): [phone]
P.O. Box 26 Fax: [phone]
FI-00421 Helsinki
Finland
Visit our Internet pages at http://www.vaisala.com/
© Vaisala 2008
No part of this manual may be reproduced in any form or by any means, electronic or
mechanical (including photocopying), nor may its contents be communicated to a third
party without prior written permission of the copyright holder.
The contents are subject to change without prior notice.
Please observe that this manual does not create any legally binding obligations for
Vaisala towards the customer or end user. All legally binding commitments and
agreements are included exclusively in the applicable supply contract or Conditions of
Sale.

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Table of Contents
CHAPTER 1
GENERAL INFORMATION............................................................................3
About This Manual...................................................................3
Version Information...............................................................3
Related Manuals...................................................................3
General Safety Considerations.............................................4
Feedback...............................................................................4
Product Related Safety Precautions......................................4
ESD Protection .........................................................................5
Recycling ..................................................................................5
Warranty....................................................................................5
CHAPTER 2
PRODUCT OVERVIEW..................................................................................7
GMT220 Transmitter Parts ......................................................7
LED Indicators and Optional Display.....................................9
CHAPTER 3
INSTALLATION............................................................................................11
Wall Mounting.........................................................................11
Duct or Channel Mounting ....................................................12
Connections............................................................................13
Power Supply Requirements ................................................14
Connection to a 24 VAC Supply ...........................................14
Relays......................................................................................15
CHAPTER 4
OPERATION.................................................................................................17
Getting Started .......................................................................17
Serial Commands...................................................................18
Setting Relay Trigger Points ...............................................19
Pressure Compensation......................................................20
Temperature Setting ...........................................................20
Display Setting ....................................................................21
Setting Current Output Range.............................................21
Error States.............................................................................22
Non-critical and Fatal Errors ...............................................22
Error Indication in Transmitters without Display..................23
Error Messages ......................................................................23

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CHAPTER 5
MAINTENANCE............................................................................................25
Replacing the Probe...............................................................25
Transmitter with Integrated Probe (Wall Model)..................25
Transmitter with Remote Probe...........................................25
Check and Calibration............................................................26
Comparison with Calibrated Probe......................................26
Calibrator GMK220..............................................................27
On-site Checking and Adjusting with Reference Gas and
GM70 Hand-Held Meter......................................................27
Two-Point Adjustment Procedure........................................28
One-Point Adjustment Procedure........................................30
Technical Support ..................................................................32
Vaisala Service Centers.........................................................33
CHAPTER 6
TECHNICAL DATA ......................................................................................35
Technical specifications........................................................35
Inputs and outputs...............................................................36
Operating conditions............................................................36
Mechanics ...........................................................................36
Electromagnetic compatibility..............................................37
Accessories.........................................................................37
Dimensions in mm (inches)...................................................38

Chapter 1 ________________________________________________________ General Information
VAISALA________________________________________________________________________ 3
CHAPTER 1
GENERAL INFORMATION
This chapter provides general notes for the manual and the product.
About This Manual
This manual provides information for installing, operating, and
maintaining Carbon Dioxide Transmitter Series GMT220.
Version Information
Table 1 Manual Revisions
Manual Code Description
M010022EN-C September 2002
M010022EN-D August 2008
M010022EN-E October 2008 - Updated technical specification
Related Manuals
Table 2 Related Manuals
Manual Code Manual Name
M010139EN-E Vaisala CARBOCAP®Hand-Held Carbon Dioxide
Meter GM70 User's Guide

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General Safety Considerations
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.
Feedback
Vaisala Customer Documentation Team welcomes your comments
and suggestions on the quality and usefulness of this publication. If
you find errors or have other suggestions for improvement, please
indicate the chapter, section, and page number. You can send
comments to us by e-mail: [email protected]
Product Related Safety Precautions
The Carbon Dioxide Transmitter Series GMT220 delivered to you has
been tested for safety and approved as shipped from the factory. Note
the following precautions:
WARNING Ground the product, and verify outdoor installation grounding
periodically to minimize shock hazard.
CAUTION Do not modify the unit. Improper modification can damage the
product or lead to malfunction.

Chapter 1 ________________________________________________________ General Information
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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. However, it is possible to damage
the product by delivering electrostatic discharges when touching,
removing, or inserting any objects inside the equipment housing.
To make sure you are not delivering high static voltages yourself:
- Handle ESD sensitive components on a properly grounded and
protected ESD workbench. When this is not possible, ground
yourself to the equipment chassis before touching the boards.
Ground yourself with a wrist strap and a resistive connection cord.
When neither of the above is possible, touch a conductive part of
the equipment chassis with your other hand before touching the
boards.
- Always hold the boards by the edges and avoid touching the
component contacts.
Recycling
Recycle all applicable material.
Dispose of batteries and the unit according to statutory regulations.
Do not dispose of with regular household refuse.
Warranty
Vaisala issues a guarantee for the material and workmanship of this
product under normal operating conditions for one (1) year from the
date of delivery. Exceptional operating conditions, damage due to
careless handling and misapplication will void the guarantee.

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Chapter 2 __________________________________________________________ Product Overview
VAISALA________________________________________________________________________ 7
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 CO2in industrial applications. The CARBOCAP®sensor is
silicon based and its operation is based on the NDIR Single-Beam
Dual-Wavelength principle.
0807-032
Figure 1 GMT220 with Integrated Probe

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The following numbers refer to Figure 1 on page 7:
1 = Transmitter cover
2 = Transmitter housing
3 = Integrated probe (interchangeable)
4 = Printed protective film
5 = Tightening screw
6 = Cable gland (I.D. 6 mm)
0807-033
Figure 2 GMT220 with Probe Installed Remotely
The following numbers refer to Figure 2 above:
7 = Remote probe (interchangeable)
8 = Probe cable (2m)
9 = Clamping sleeve
10 = Cable clamp
11 = Pin connector for a serial COM adapter
12 = Probe mounting clips (optional)
13 = Mounting flange (optional)
14 = Fixing screws (4 pcs)

Chapter 2 __________________________________________________________ Product Overview
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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 LEDSare lit if the relay setting is reached, for
example when CO2concentration is over the predefined limit. If
the relays are not in use, the LEVEL LEDs indicating CO2
concentration are dark.
The transmitter is also available with an optional back lit LCD
display, which outputs the CO2volume concentration in unit of
percentage or ppm depending on the measurement range of the probe.
Blinking led lights and Er-codes in the display indicate operation
errors, see Error Messages on page 23.
0807-034
Figure 3 LED Indicators and Optional Display
For GMP221 probe, the display shows percentage values with two
decimal accuracy, for example 0.31 %. For GMP222 probe, the
display shows ppm values rounded up to the nearest 10 ppm.

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Chapter 3 _______________________________________________________________ Installation
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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

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The following numbers refer to Figure 4 on page 11:
1 = Attach the mounting plate to the wall with screws.
2 = Press down the transmitter so that it slides along the rails of
the mounting plate.
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).
0807-036
Figure 5 Gasket Ring
NOTE If the air pressure in the duct is clearly lower than the surrounding air
pressure, an additional sealing may be necessary. This is to avoid
possible measurement errors due to leakages through the joint.

Chapter 3 _______________________________________________________________ Installation
VAISALA_______________________________________________________________________ 13
Connections
To connect the GMT220:
1. Connect the nominal 24 V supply terminals (+) and (-) on the
motherboard (right-hand side, see Figure 6).
2. Connect the analog output (see Figure 6) as follows:
Terminal 0: the common wire (-)
Terminal V: voltage output signal (+)
Terminal mA: current output signal (+)
If the current output is chosen, select the output range by using the
current output jumper 4mA (see Figure 6). If the range of 4...20mA is
chosen, connect the jumper (default). If the range of 0...20 mA is
chosen, disconnect the jumper.
CAUTION Connecting the power leads to the output terminals can seriously
damage the product.
1
2
3
4
5
6
7
8
3
0807-037
Figure 6 Electrical Connections and Jumpers

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The following numbers refer to Figure 6 on page 13:
1 = Current output jumper (4 mA)
2 = Relay jumpers L1 and L2
3 = A, B, C and D: Not intended for customer use
4 Relay 2 terminals
4 = Relay 4 terminals
6 = Serial port
7 = Power supply terminals
8 = Output terminals
Power Supply Requirements
The GMT220 series transmitters are designed to operate with a
nominal 24 VAC/DC supply. The power supply should maintain the
voltage for all load conditions and all mains voltages. The power input
includes a halfwave rectifier. To avoid current peaks, it is
recommended to use a DC supply.
Connection to a 24 VAC Supply
The GMT220 series transmitters can be connected to a 24 VAC
supply without an external rectifier. However, when more than one
transmitter is connected to one 24 VAC transformer, a common loop
is formed and risk of a short-circuit increases. To avoid this, always
use separate floating supply for each transmitter, see Figure 7 A.
CAUTION If several transmitters have to share one transformer, the phase (∼)
must always be connected to (+) connector (24 V) in each transmitter,
see Figure 7 B.

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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 13. 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. The points can also be changed with a PC and the optional
serial COM adapter 19040GM, see Setting Relay Trigger Points on
page 19. The COM adapter 19040GM, see Figure 8 below, can be
ordered from Vaisala. For order information, see Accessories on page
37.
0808-001
Figure 8 19040GM Serial COM Adapter

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Chapter 4 ________________________________________________________________ Operation
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CHAPTER 4
OPERATION
This chapter contains information that is needed to operate this
product.
Getting Started
The GMT220 is linked to PC via a serial cable equipped with a COM
adapter (optional part 19040GM, can be ordered from Vaisala).
Connect the serial cable to your PC's serial port and transmitter's serial
port located in the motherboard, see Figure 9 below.
0807-039
Figure 9 Serial Port and Cable Direction

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Set the serial settings according to Table 3 below.
Table 3 Serial Settings
Baud rate 9600
Parity
N
one
Data bits 8
Stop bits 1
Flow control Xon/Xoff (none)
NOTE Remember to save the settings after each command.
Serial Commands
Table 4 Serial Commands
Command Description
MF_Rx_HIGH Sets high relay trigger limit
MF_Rx_LOW Sets low relay trigger limit
MAIN_SAVE F Saves changes
MF_PRESSURE Sets ambient pressure value
MF_TEMP Sets ambient temperature value
MF_DMODE Sets display operation mode
MF_OUT_I_MODE Sets current output range
NOTE To view all set values for the transmitter, use MF command alone,
without any parameters.