Vaisala CARBOCAP GMT220 SERIES Manual de usuario

GMT220 Series

CO2transmitter

USER’S GUIDE

U376EN-1.1

September 1999

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PUBLISHED BY

VAISALA Oyj Phone (int.): (+358 9) 894 91

P.O. Box 26 Telefax: (+358 9) 894 9227

FIN-00421 Helsinki Telex: 122842 vsala fi

FINLAND

Visit our Internet pages at http://www.vaisala.com/

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 of instruction manuals are subject to change without

prior notice.

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CHAPTER 1_______________________________________________________ GENERAL INFORMATION

VAISALA __________________________________________________________________________ 1

Table of contents

CHAPTER 1

GENERAL INFORMATION............................................................................2

Safety.........................................................................................2

Warranty ....................................................................................2

CHAPTER 2

PRODUCT DESCRIPTION.............................................................................3

Parts...........................................................................................3

Led light indicators and optional display...............................5

CHAPTER 3

INSTALLATION AND MAINTENANCE .........................................................6

Mounting....................................................................................6

Electrical connections..............................................................7

Power supply requirements ....................................................8

Connection to a 24 VAC supply..............................................8

Relays ........................................................................................9

Maintenance............................................................................10

Replacing the probe ............................................................10

Calibration checking............................................................10

Self diagnostics ...................................................................11

CHAPTER 4

SERIAL COMMUNICATION SETTINGS .....................................................12

Setting relay trigger points....................................................12

Pressure compensation.........................................................13

Saving the settings.................................................................13

CHAPTER 5

TECHNICAL DATA.......................................................................................14

Dimensions .............................................................................14

Technical specifications........................................................15

Operating conditions............................................................16

General................................................................................16

Mechanics............................................................................17

Electromagnetic compatibility..............................................17

Accessories .........................................................................17

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USER’S GUIDE_______________________________________________________________________

2 ______________________________________________________________________U376EN-1.1

CHAPTER 1

GENERAL INFORMATION

Safety

Throughout the manual, important safety considerations are

highlighted as follows:

WARNING Warning denotes a serious hazard. It calls attention to a procedure,

practice, condition or the like, which, if not correctly performed or

adhered to, could result in injury to or death of personnel.

CAUTION Caution denotes a hazard. It calls attention to a procedure, practice,

condition or the like, which, if not correctly performed or adhered to,

could result in damage to or destruction of part or all of the product.

NOTE Note highlights important information. It calls attention to an

essential procedure, practice, condition or the like.

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 DESCRIPTION

VAISALA __________________________________________________________________________ 3

CHAPTER 2

PRODUCT DESCRIPTION

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.

Parts

Different parts of the GMT220 transmitter are shown in Figure 1 and

Figure 2.

Figure 1 Different parts of GMT220. Probe integrated into

the transmitter housing e.g. wall model transmitter.

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USER’S GUIDE_______________________________________________________________________

4 ______________________________________________________________________U376EN-1.1

Figure 2 Different parts of GMT220. Probe installed

remotely.

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CHAPTER 2_______________________________________________________ PRODUCT DESCRIPTION

VAISALA __________________________________________________________________________ 5

Led light indicators and optional display

The GMT220 series transmitter has as standard three LED light

indicators on the cover plate: operation, level 1 and level 2 (see Figure

3). The green operation LED is lit as the power is connected. If the

relays are used, the lit red LED indicates excess of corresponding relay

trigger point e.g. CO2concentration is over predefined limit. In

normal conditions, the LEDs indicating CO2concentration are dark.

The transmitter is also available with an optional back lit LCD

display, which outputs the CO2concentration as either percentage or

ppm depending on the measurement range of the probe.

Figure 3 LED light indicators and optional display

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USER’S GUIDE_______________________________________________________________________

6 ______________________________________________________________________U376EN-1.1

CHAPTER 3

INSTALLATION AND MAINTENANCE

Mounting

Mount the wall model transmitter or the remote probe into a place,

which gives a true picture of the environment to be measured and is as

clean as possible. Air should circulate freely around the probe. Please

take into a consideration that because CO2is slightly heavier than air

it tends to accumulate in low areas without proper ventilation e.g. the

CO2concentration is higher there.

Figure 4 Mounting the transmitter

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CHAPTER 3________________________________________________ INSTALLATION AND MAINTENANCE

VAISALA __________________________________________________________________________ 7

Figure 5 Mounting the probe in a duct or channel.

When the probe is installed in a duct or channel, it is recommended to

use the optional mounting flange GM45156. All you need to do is to

drill a hole with minimum diameter of 22 mm in the wall. The flange

is then attached onto the duct with four screws so that the gasket ring

seals the attachment. The probe is placed through the flange so deep

that the perforated head is completely in the duct (see Figure 5).

NOTE If there is clearly lower air pressure in the duct, an additional sealing

may be necessary. This is to avoid possible CO2concentration

variation due to leaking through the attachment.

Electrical connections

The nominal 24 V supply is connected between terminals + and - on

the motherboard (right-hand side). The analogue outputs are available

at remaining terminals (see Figure 6). The common wire is connected

to terminal 0 and the other wire either to terminal V (voltage output)

or to terminal mA (current output). The current output is chosen with

the jumper 4mA (see Figure 6): 4...20mA is chosen by connecting the

jumper (default) and the 0...20 mA is chosen by disconnecting the

jumper.

CAUTION Connecting power leads to the output terminals can seriously damage

the product.

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Figure 6 Electrical connections and jumpers

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 also 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 there is an increased risk of a short-circuit. 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 in each transmitter (see

Figure 7 B).

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