Vaisala GMM20W User Manual download pdf

GMM20W CO

module

Sensor Systems Division U300en-1.1

1999-11-16

INTRODUCTION

Vaisala’s GMM20W module uses a

completely new sensor technology. The

silicon based CARBOCAP



sensor

provides for excellent stability and

reliability. The GMM20W module

requires almost no maintenance: the

recommended calibration interval is five

years. This combined with the high

performance makes the GMM20W

modules an ideal choice for OEM

applications related to ambient CO

measurement.

72 mm

74 mm

Figure 1 Dimensions

ELECTRICAL CONNECTIONS

The nominal 24 V supply must be

connected between terminals + and - on

the mother board. The analogue output is

available at remaining terminals. 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 0/4mA (see

Figure 3): 4...20mA is chosen by

connecting the jumper (default) and the

0...20 mA is chosen by disconnecting the

jumper. If the relay output of display

models is used, note that the wiring is

done at the back of the display board.

The default relay trigger point has been

set to 1000 ppm. This can be changed

with the optional software kit 19222GM.

For further details, contact your local

Vaisala representative.

Figure 2 Electrical connections and

leds V7, V10

Note that during normal operation the

green led (V10) at the lower righthand

corner is blinking. In case the self-

diagnostics procedure comes across some

abnormality, the red led (V7) lights up

(see Figure 2 above).

1 2 3 4 5

Summary of Contents

Page 1 - 74 mm

GMM20W CO2 moduleSensor Systems Division U300en-1.11999-11-16INTRODUCTIONVaisala’s GMM20W module uses acompletely new sen

Page 2 - 1999-11-16

GMM20W CO2 moduleSensor Systems Division U300en-1.11999-11-16SERVICE AND MAINTENANCEThe GMM20W module has an excellentsta

Page 3 - Controller

GMM20W CO2 moduleSensor Systems Division U300en-1.1

Page 4 - Accessories

GMM20W CO2 moduleSensor Systems Division U300en-1.11999-11-16TECHNICAL DATACarbon dioxideMeasuring range 0...2000 ppm CO2

Page 5 - GMM20W CO

GMM20W CO2 moduleSensor Systems Division U300en-1.1

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Vaisala GMM20W User Manual

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Summary of Contents

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