Introducing the
CARBOCAP®
Vaisala's GMW21D wall mounted transmitter uses
the new silicon based CARBOCAP sensor. The simple structure and
reference measurement capabilities make this Single-Beam
Dual-Wavelength NDIR sensor extremely stable and reliable. The
GMW21D transmitter is specially designed for Demand Controlled
Ventilation (DCV) applications. They are easy to install and
requite almost no maintenance.
CARBOCAP®
Technology
The structure of the diffusion aspirated
Single-Beam Dual-Walelength sensor is remarkably simple: it
consists of an infrared source, a sample cell, a tunable solid state
interference filter and and IR detector.
The tunable interference filter
enables measurements at two wavelengths. This means that
the reference measurements can be made without the typical weaknesses
of Dual-Beam sensors.
Superior
Performance
The use of the new "carbocap" sensor
and the GMW21D monitor have several advantages: high
accuracy and excellent stability, negligible temperature dependence,
ease of installation and reliable operation as well as a five year
recommended calibration interval. The measurement accuracy of
the sensor is not affected by dust, water vapor or most
chemicals. Use of the GMW21D transmitter results in
considerable saving in installation, operation, maintenance and
recalibration costs and ensures the best possible control of air
quality.
Versatile
Transmitters
The GMW21D transmitter can be
used independently or it can be incorporated into building energy
management systems.
|
Technical
Data |
| Measured
Variables |
| Measurement
range |
0
~ 2000 ppm (nominal; can be calibrated for other ranges: 0 ~
5000 ppm,
0 ~ 10,000 ppm, 0 ~ 20,000 ppm) |
| Accuracy
at 77 °F (25°C) against certified factory references.
Including non-linearity
and calibration uncertainty. |
<±30
ppm + 2% of reading
<±1% FS |
| Temperature
dependence of output (typical value) |
0.05%
FS/F (0.1% FS/C) |
| Long-term
stability |
<5%
FS/5 years |
| Response
time (0 ~ 63% response) |
1
minute |
| Temperature |
| Output
signal |
0 ~
10V |
| Accuracy
@25°C |
±0.9°F
(±0.5C) |
| Measuring
range |
32 ~
113°F (0 ~ 45C) |
| Warm
up time |
30
minutes |
| 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
Voltage output |
max 500 Ohm
min. 1 kohm |
| Power
supply (10 ~ 30 VDC) |
nominal
24 VDC/VAC |
| Power
consumption |
<2.5
W |
| Warm-up
time |
1
minute, 15 minutes full specification |
| Operating
temperature range |
+23 ~
113°F (-5 ~ +45°C) |
| Operating
humidity range |
0 ~
85% RH non-condensing |
| Weight |
100 g
(130g) |
Made in Finland
