Vaisala CARBOCAP GMW80 Series User manual

M211748EN-A
USER'S GUIDE
Vaisala CARBOCAP® Carbon Dioxide and
Temperature Transmitters GMW80 Series

PUBLISHED BY
Vaisala Oyj
Street address: Vanha Nurmijärventie 21, FI-01670 Vantaa, Finland
Mailing address: P.O. Box 26, FI-00421 Helsinki, Finland
Phone: [phone]
Fax: [phone]
Visit our Internet pages at www.vaisala.com.
© Vaisala 2014
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. Translated
manuals and translated portions of multilingual documents are based on the
original English versions. In ambiguous cases, the English versions are
applicable, not the translations.
The contents of this manual are subject to change without prior notice.
This manual does not create any legally binding obligations for Vaisala towards
customers or end users. All legally binding obligations and agreements are
included exclusively in the applicable supply contract orthe General Conditions
of Sale and General Conditions of Service of Vaisala.
2

Table of Contents
1 General Information 2
About This Document 2
Documentation Conventions 2
Safety 3
ESD Protection 3
Recycling 3
Regulatory Compliances 4
Trademarks 4
Software License 4
Warranty 4
2 Product Overview 5
Introduction to GMW80 Series 5
Transmitter Models 5
Transmitter Parts 6
Temperature Setpoint Potentiometer 8
Analog Output Overrange Behavior 9
3 Installation 10
Selecting Location 10
Opening and Closing the Transmitter 11
Installing the Mounting Base 12
Wiring 13
Wiring GMW86P 14
Wiring GMW86PT 14
4 Maintenance 15
Cleaning 15
Replacing the CO2 Measurement Module (GM10) 16
5 Troubleshooting 17
Problem Situations 17
Error State 18
Technical Support 19
Product Returns 19
6 Technical Data 20
Specifications 20
Dimensions 22
Spare Parts and Accessories 23
1

1GENERAL INFORMATION
About This Document
This document provides information for installing, operating, and maintaining
GMW80 series transmitters.
Document Code Description
M211748EN-A November 2014. First version.
Table 1 Version Information
Document Code Description
M211660EN GM10 Quick Guide
Table 2 Related Documents
Documentation Conventions
Warnings alert 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.
Cautions warn 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.
Notes highlight important information on using the product.
2
1 General Information

Safety
The GMW80 series transmitter delivered to you has been tested for safety and
approved as shipped from the factory. Note the following precautions:
Connect only de-energized wires.
Do not modify the unit. Improper modification can damage the
product or lead to malfunction.
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.
To make sure you are not delivering high static voltages yourself, avoid touching
exposed component contacts during installation and maintenance.
Recycling
Recycle all applicable material.
Dispose of the unit according to statutory regulations. Do not
dispose of with regular household refuse.
3
1 General Information

Regulatory Compliances
GMW80 series is in conformity with the following directives:
nRoHS-Directive
nEMC-Directive
The conformity is declared with using the following standards:
nEN50581: Technical documentation for the assessment of
electrical and electronic products with respect to the restriction
of hazardous substances.
nEN 61326-1: Electrical equipment for measurement, control,
and laboratory use – EMC requirements – Immunity test
requirements for equipment intended to be used in an
industrial electromagnetic environment.
nEN 550022: Information technology equipment – Radio
disturbance characteristics – Limits and methods of
measurement.
Trademarks
CARBOCAP®is a registered trademark of Vaisala Oyj.
All other trademarks referred to 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.
Warranty
Visit our Internet pages for more information and our 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.
4
1 General Information

2PRODUCT OVERVIEW
Introduction to GMW80 Series
The Vaisala GMW80 series CARBOCAP® carbon dioxide and temperature
transmitters are wall-mount transmitters designed to fulfill the needs for CO2
measurements in standard demand controlled ventilation applications. The CO2
measurement is based on a new generation CARBOCAP® sensor, which uses
a novel, silicon-based microchip emitter instead of an incandescent light bulb.
The internal reference in the CO2sensor guarantees the best stability and
operation also in constantly occupied buildings without frequent readjustments.
All GMW80 series transmitters measure carbon dioxide (CO2) and temperature
(T). GMW86PT includes a temperature set-point potentiometer.
The CARBOCAP® sensors give correct CO2measurements immediately when
powered on. As they have a built-in reference measurement they do not need a
lengthy learning phase before the measured values are correct. Proper
operation can be verified immediately after snapping on the device cover.
Transmitter Models
Model CO2Output(s) T Output T Setpoint Potentiometer
GMW80P 1 x 4 ... 20 mA
1 x 0 ... 10 V
Pt1000 (passive) No
GMW80PT 1 x 4 ... 20 mA
1 x 0 ... 10 V
Pt1000 (passive) Yes
Table 3 GMW80 Series Transmitters
5
2 Product Overview

Transmitter Parts
Figure 1 GMW80 Series Transmitter Parts
1 = Opening tab.
2 = Screw terminals. The wiring information is marked on the mounting base
next to the terminals.
3 = Barrier to prevent the cable from being routed below the GM10
measurement module. The area to avoid is marked No cable on the
mounting base.
4 = Orientation arrow. Should point up after the mounting base has been
installed.
5 = Opening for cable when wiring from behind(recommended).
6 = Place for zip tie (optional, for cable strain relief).
7 = Breakaway tab for routing the cable from below.
8 = Locking screw. Supplied with the transmitter.
9 = Breakaway tab for routing the cable from the top.
10 = Setpoint wheel (model GMW86PT only).
6
2 Product Overview

Figure 2 GMW80 Series Component Board Parts
1 = Pins that connect the transmitter cover to the screw terminals when the
transmitter cover is in place.
2 = Pt1000 temperature sensor.
3 = GM10 carbon dioxide measurement module.
4 = Potentiometer component (model GMW86PTonly).
7
2 Product Overview

Temperature Setpoint Potentiometer
Some GMW80 series transmitter models include a temperature setpoint function
that gives the occupant of the monitored space a way to adjust the temperature.
The setpoint function is implemented using a passive 10 kΩ potentiometer
(variable resistor) that is mechanically actuated by a setpoint wheel on the lower
part of the transmitter.
The transmitter is simply marked with plus "+" and minus "-" signs to indicate the
direction of adjustment. The rotation of the wheel is mechanically limited to
approximately 180degrees, so in actual use the resistance range of the
potentiometer varies between approximately 2.1 kΩ and 7.2 kΩ. The
corresponding temperature change is decided on the building controller level.
Setpoint wheel at midpoint:
~4.65kΩresistance.
Setpoint wheel at minimum:
~2.1kΩresistance.
Setpoint wheel at maximum:
~7.2kΩresistance.
8
2 Product Overview

Analog Output Overrange Behavior
Analog outputs of the GMW80 series transmitters have a defined behavior when
the values measured by the transmitter are outside the scaled analog output
range:
nOutput of the CO2measurement is clipped at the end of the scaled output
range (2000 ppm). For example, the current output will not go above 20
mAeven if the measured CO2reading keeps rising.
nIf the measured CO2reading rises above 6000 ppm, the outputs are set to the
error state. See section Error State on page18.
The reading from the passive Pt1000 resistor is not affected by the overrange
behavior or the error state.
9
2 Product Overview

3INSTALLATION
Selecting Location
When mounting wall model transmitters:
nSelect a location that represents well the area of interest.
nDo not install on the ceiling.
nAvoid placing the transmitter near heat and moisture sources, close to the
discharge of the supply air ducts, and in direct sunlight.
Figure 3 Selecting Transmitter Location
Seal the cable opening when bringing a cable through the wall.
The hole will supply air from outside the room into the transmitter
and affect the measurement readings. For example, fresh
concrete binds CO2and may cause low readings, especially in
new buildings.
10
3 Installation

Opening and Closing the Transmitter
GMW80 series transmitters are delivered from the factory with a pull tab that
makes it easy to open the transmitter for installation.
To open the transmitter after it has been installed:
1. Remove the locking screw if it has been installed.
2. Use a flat screwdriver to push down the tab that holds the transmitter cover
and mounting base together, and pull the top of the transmitter cover away
from the mounting base.
Figure 4 Location of the Opening Tab
Be careful when opening the transmitter:
nPushing down too hard can break off the opening tab.
nInserting the screwdriver too far into the transmitter enclosure
may damage transmitter components.
To close the transmitter:
1. Align the bottom of the transmitter cover with the bottom of the mounting
base.
2. Tilt the top of the transmitter cover forward until the tab catches. Note that
closing the transmitter starts it up if power is supplied to the screw terminals.
3. Reinstall the locking screw if desired.
11
3 Installation

Installing the Mounting Base
Use the mounting holes to attach the mounting base securely. Use at least two
screws (not included). The mounting holes are suitable for the most common
European, American, and Asian mounting boxes. The mounting base can be
twisted on to pre-mounted screws.
Figure 5 Installing the Mounting Base
Note that mounting bases are model-specific. If you attach
several mounting bases before connecting the transmitters, store
the transmitters in their individual shipping boxes.
The arrow on the mounting base must point straight up after
installation. Proper orientation is important: air must flow through
the vents on the bottom and top.
12
3 Installation

Wiring
Connect the wiring to the screw terminals on the mounting base. The terminal
assignments are marked next to the screw terminals. Maximum wire size is
2mm2(AWG14).
Route the cable through the hole in the mounting base if possible. You can also
bring the cable to the housing from above or below, but you have to break off the
small plastic tab that covers the hole on top or bottom of the mounting base.
After completing the wiring, connect the transmitter body over the mounting
base. Note that mounting bases are model-specific.
Connect only de-energized wires.
Do not route the cable through the area marked NOCABLESon
the mounting base. That space is taken up by the CO2
measurement module when the transmitter cover is attached.
Figure 6 Routing the Cable from Behind
13
3 Installation

Wiring GMW86P
Figure 7 GMP86PWiring
Wiring GMW86PT
Figure 8 GMP86PTWiring
14
3 Installation

4MAINTENANCE
Cleaning
The body of the transmitter can be cleaned by wiping with a moistened lint-free
cloth. Do not use cleaning agents or solvents, or blow pressurized air into the
transmitter housing.
If you suspect the CO2measurement module is dirty, do not
attempt to open it. Instead, replace it with a new part. For order
codes of spare parts, see section Spare Parts and Accessories
on page23.
15
4 Maintenance

Replacing the CO2Measurement Module (GM10)
nGM10 spare part module (Vaisala order code GM10SP80)
nFlat head screwdriver (for opening the transmitter)
1. Disconnect the transmitter body from the mounting base.
2. Locate the GM10 module on the transmitter. The module is a separate
component board with a golden cuvette that contains the CARBOCAP®
sensor. The module is connected to the main transmitter board with a
connector, and held in place by a plastic clip on the other side. See Figure 2
on page7.
3. Disconnect the module by carefully lifting the module from the connector
side.
Figure 9 Disconnecting the GM10 Module
4. Take the new GM10 module and place it in the hole for the module so that
the plastic clip meets the component board. Then lower the connector end
of the module.
5. Push down on the module to secure the connector.
6. Reconnect the transmitter to the mounting base.
7. Check the output of the transmitter to verify that the CO2measurement is
working normally and is not in the error state. For more information on the
error state, see section Error State on page18.
16
4 Maintenance

5TROUBLESHOOTING
Problem Situations
Problem Possible Cause Remedy
Analog output reading is
unchanging and appears
incorrect.
Analog output is in error
state.
Inspect the transmitter for
the cause of the error and
remove the cause. See
section Error State on the
next page.
Temperature reading is too
high.
Transmitter is installed in an
unsuitable location, for
example, near a heat source
or in sunlight.
Relocate transmitter. See
section Selecting Location on
page10.
Transmitter installed in
improper orientation.
Reinstall transmitter with the
arrow on the mounting base
pointing up.
Unsuitable operating
environment.
Verify that the operating
environment is within
specified operating limits.
CO2reading is too high. Source of CO2near the
transmitter.
nUse a portable
instrument to verify the
CO2reading at the
installation location. Avoid
breathing on the
instruments while
checking.
nCheck for sources of CO2
in the measured area,
such as people working
right next to the
transmitter.
CO2measurement module
must be replaced.
See section Replacing the
CO2 Measurement Module
(GM10) on page16.
Table 4 Possible Problem Situations and their Remedies
17
5 Troubleshooting

Problem Possible Cause Remedy
CO2reading is too low. The measured area contains
materials that bind CO2
(such as fresh concrete),
producing a low-CO2
environment.
nUse a portable
instrument to verify the
CO2reading at the
installation location. Avoid
breathing on the
instruments while
checking.
nCheck if the transmitter is
installed on a mounting
box that supplies air from
inside the wall into the
transmitter. If yes, plug
the hole. See section
Selecting Location on
page10.
CO2measurement module
must be replaced.
See section Replacing the
CO2 Measurement Module
(GM10) on page16.
Error State
If the transmitter detects a serious hardware or software error, or the measured
reading is well outside the scaled range, the analog outputs are set into a
defined error level instead of the measured result. The error level depends on
the output type:
nFor 4 ... 20 mA output, the error level is 3.6 mA.
nFor 0 ... 10 V output, the error level is 11 V.
If the cause of the error is removed, the transmitter resumes normal operation of
analog outputs. Some errors may require a reset of the transmitter to recover.
Examples of situations that can cause the error state:
nThe CO2measurement module (GM10) is disconnected.
nThe transmitter measures over 6000 ppm CO2. For more information, see
section Analog Output Overrange Behavior on page9.
18
5 Troubleshooting