Vaisala GMM220 User Manual download pdf

GMM220

Transmitter Modules

M010115EN-E _______________________________________________________________________ 1

Introduction

Vaisala GMM220 transmitter modules are versatile instruments for measuring CO

industrial applications. The CARBOCAP

sensor is silicon based and its operation is

based on the NDIR Single-Beam Dual-Wavelength principle. The modules can be

configured for different CO

measurement ranges and analog output ranges.

Figure 1 Dimensions of the Probes and Component Board of the GMM220

Series (in mm)

The GMM220 module consists of a component board, cable and a CO

probe. The

shorter probe model (GMP221) is for higher and the longer model (GMP222) for lower

concentrations. A waterproof connector connects the probe to the cable. The probe

also features a non-volatile memory for storing the calibration parameters. This enables

interchangeability of the probes and allows easy field calibration by exchanging the

probe with a freshly calibrated one.

Mounting

For power supply and analog outputs, the board is available either with pinheaders on

bottom side or with screw terminals on top side; serial interface has always a pinheader.

Figure 2 Dimensions of the Component Board (in mm)

If the board has pinheaders, mount it by soldering or plugging it into host board's female

connectors.

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GMM220 CO2 Transmitter Modules M010115EN-E _______________________________________________________________________ 1 Introduction Vaisala GMM220 t