Owner's manual

GMM20W CO
2
module
Sensor Systems Division U300en-1.1
1999-11-16
TECHNICAL DATA
Carbon dioxide
Measuring range 0...2000 ppm CO
2
(nominal)
(can be recalibrated for other ranges: 0...5000 ppm, 0...10000 ppm, 0...20000 ppm)
Accuracy at 20°C <±[1% FS + 1.5% of the reading]
(including non-linearity and calibration uncertainty)
Repeatability <+1 % FS
Temperature dependence
of output < 0.05 %FS / °C
Long-term stability
(in ambient conditions) <±5 % / 5 years
Response time (0...67%) 1 minute
Operating conditions
Operating temperature -5...+45 °C
Storage temperature -20...+70 °C
Humidity range:
temporarily 0...100 %RH (non-condensing)
continuous use 0...85 %RH (non-condensing)
General
Output signals 0...20 mA or 4...20 mA and 0...10 V
Optional outputs relay
LonWorks

interface
Recommended external
load: current output max. 500Ω
voltage output min. 1kΩ
Relay contact ratings max. 50 V 0.5A
Power supply nominal 24 VDC/VAC (18...30 VDC)
Power consumption < 2.5 W
Warm-up time < 5 minutes
Dimensions: 72 x 74 x 19 mm
Weight: 56 g
Accessories
Order code Description
GMI21 Display and relay option
GMR20 Relay output option
GML20
LonWorks

interface option
19222GM Calibration software kit (incl. disk and serial COM adapter)
18192GM Field calibration kit (used with Vaisala’s portable CO
2
meters)
The GMM20W module complies with the following standards and has passed the following
tests:
EN50081-1 (EN 55022 class B)
EN50082-1 (IEC 1000-4-3, IEC 801-4 (1988) )
GUARANTEE
Vaisala issues a guarantee for the material and workmanship of this
product under normal operating conditions for one (1) year from the