Specifications

100 Commerce Way, Woburn, MA 01801
TEL: 1-888-VAISALA (824-7252) FAX: [phone]
E-MAIL: [e-mail] Access catalog on-line at: www.vaisala.com/inc/ssdcat
74
Housing material ABS plastic
Housing classification
(electronics housing GMD20) NEMA 4 (IP 65)
Weight:
GMW 21 (D) 100 g (130 g)
GMD 20 (D) 140 g (170g)
Dimensions (l x h x d): see drawings below
Wall-mount also available in smaller size. Contact Vaisala for
details.
Accessories and Options
GMW 21D wall unit with display & relay
GMD 20D duct unit with display & relay
GMI 21 display and relay option for GMW21
GMR 20 relay output option
GML 20 LonWorks
®
module with CO
2
signal
GML 20T LonWorks
®
module with both
CO
2
signal and temperature signals
19222GM calibration software kit
(disk and serial COM adapter)
18192GM field calibration kit
(used with Vaisala's portable CO
2
meters)
GMA 20T Analog temperature module for GMW 21
Specifications subject to change without notice.
Measured Variables
Measurement range 0...2000 ppm
(nominal; can be calibrated for other ranges:0...5000 ppm,
0...10000 ppm, 0...20000 ppm,)
Accuracy at 77 °F (+25 °C) against certified factory references
<±1 % FS + 1.5% of reading)
(incl. nonlinearity and calibration uncertainty)
Repeatability <±1 % FS
Temperature dependence
of output (typical value) 0.05 % FS/°F (0.1 % FS/
0
C)
Long-term stability <5% FS/5 years
Response time 60 seconds
(0...63% response)
Temperature (optional with wall model)
Output signal 010v
Temperature range 32122°F (050°C)
Accuracy (@25°C) ±0.9°F (±0.5°C)
Warm up time 30 min
Sensor Semiconductor IC
General
Output signals 0...20 mA or 4...20 mA and 0..10 V
Optional outputs relay
LonWorks
®
interface
RS 232 (with serial COM adapter)
Recommended external load:
current output max. 500 Ohm
voltage output min. 1 kohm
Power supply nominal 24 VDC/VAC
(18...30 VDC)
Power consumption <2.5 W
Warm-up time <5 minutes
Operating temperature range +23 to 113
0
F (-5...+45 °C)
Operating humidity range
short term 0...100 %RH non-condensing
long term 0...85 %RH non-condensing
Air flow range 010m/s
TECHNICAL DATA - GMD 20 AND GMW 20 SERIES
80
108.5
60
83
66.7
m in 80 m ax 140
Ø 15
64
42
22
42
GMD 20 AND GMW 20 SERIES
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