GMD20 Series Carbon Dioxide Transmitters

The GMD20 and GMD20D Series Transmitters use the silicon-based Vaisala CARBOCAP® Sensor. The Single-Beam, Dual-Wavelength NDIR sensor has a simple structure and reference measurement capabilities. The GMD20 series transmitters can be used independently, or incorporated into building energy management systems. The series consists of duct mount units GMD20/D and wall mount units GMW21/D and GMW22/D. Version D has a display.

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Availability: Commercially Available

Fernanda Cunha
+1 781 537 1042
1862 Craig Park Court
St. Louis, MO 63146
www.vaisala.com
Manufacturer
Vaisala, Inc.
Product Name
GMD20 Series Carbon Dioxide Transmitters
Detection Category
Chemical
Detection Principle
Molecular Spectroscopy;
Detection Method
Non-Dispersive Infrared (NDIR);
Application
Gas Analysis;
Equipment Type
Sensor
Product Synopsis
The GMD20 and GMD20D Series Transmitters use the silicon-based Vaisala CARBOCAP® Sensor. The Single-Beam, Dual-Wavelength NDIR sensor has a simple structure and reference measurement capabilities. The GMD20 series transmitters can be used independently, or incorporated into building energy management systems. The series consists of duct mount units GMD20/D and wall mount units GMW21/D and GMW22/D. Version D has a display.
Availability
Commercially Available
Technology Readiness Level (TRL)
9
User Feedback Sources
Indifferent/No user feedback
Dimensions
1.7 x 1.7 x 5.5 in (42 x 42 x 140 mm)
Weight
<1 lb.; 6 oz (170 g)
Power Requirements
AC/DC Line Power; Nominal 24 VAC/DC (18-30 VDC), Power Consumption <2.5 W
Transportability
Pocket Size
Operating Conditions
-5 to 45°C, 0 – 85% Relative Humidity, non-condensing 0 – 10 m/s
Consumables
None
Calibration Schedule
Requires factory, 5 yr calibration and offers discounted prepaid calibration plans
Suggested Routine Maintenance
Fault tracing, measurement and diagnostics, repair of components, and functionality testing may be required
Available Accessories
GMA20T temperature module, Relay output option, calibration software kit (disk and serial COM adapter)
Data Analysis Support Equipment
Purchased separately: LonWorks® module with both CO2 signal GML20T and temperature signals, calibration software kit, disk and serial COM adapter
Shelf Life
>5 years
Unit Cost
$360.00
Other Chemical Targets
Carbon Dioxide
Sample Introduction
Vapor/Gas
Sensitivity/Detection Limits
ppm
Known Interferents/Inhibitors
High pressures can affect the readings; chlorine, SO2 and water vapor can damage the sensor
Start Up Time (From Cold Start To Sample Ready)
1 minute, 15 minutes for full specifications
Response Time (Sample Application To Output)
<1 minute; 63% at 1 minute
Alarm Capability
Yes, by relay
Software Control
Minimal, simple programming
Other Operational Parameters
Temperature measurements of 0 to +50 °C
Training Required
<1 day training
Training Available
Yes
Manuals Available
Yes
Warranties
2 yr warranty standard with this device, 5 yr extended warranty is available
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