Dwyer Series GSTA Carbon Monoxide/Nitrogen Dioxide Gas Transmitter

Product Description

High Accuracy Electrochemical Sensor, Universal Output

The Series GSTA Carbon Monoxide/Nitrogen Dioxide Transmitters monitor the gas concentration in underground parking garages and loading docks. Carbon monoxide is commonly used to measure the exhaust of gasoline engines, while nitrogen dioxide is used for diesel engines. Field selectable current and voltage outputs allow the transmitter to be used with almost any building management controller. For carbon monoxide units, the user can select the output range to be from 0 to 50 ppm or up to 0 to 500 ppm. Nitrogen dioxide units come with a standard 0 to 10 ppm range. The output can be inverted to read 20 to 4 mA or 10 (5) to 0 VDC using internal dip switches.

To maximize the accuracy of the Series GSTA, the sensor can be field-calibrated using the A-449 remote LCD display. When the sensor reaches the end of its life, the display will indicate that the sensor needs to be replaced.

Models

Specifications

Sensor:

Field replaceable electrochemical, 4 years typical lifespan.
Recommend calibration every 6 months.

Range:

CO: switch selectable 200 or 500 ppm; NO2:10 ppm.

Output Drift:

<5% per year in air.

Coverage Area:

5000 to 7500 sq ft typical.

Accuracy:

CO=2% of reading, NO2=3% at the time of calibration.

Resolution:

CO=1 ppm

Temperature Limits::

>Ambient: -4 to 122°F (-20 to 50°C);

Storage: For best sensor life, 32 to 68°F (0 to 20°C).

Humidity Limits:

15 to 90% RH constant; 0 to 99% RH intermittent.

Response Time:

<45 seconds to 90% CO, <25 to 90% NO2.

Span and Zero Adjustment:

Via pushbutton, using optional A-449
display.

Housing:

UV resistant glass filled polycarbonate.

Output:

Switch selectable 4 to 20 mA (loop powered), 0 to 5 V @ 5 mA, or 0
to 10 V@ 5 mA;
Switch selectable 0 to 5 V / 1 to 5 V and 0 to 10 V / 2 to 10 V;
Switch selectable normal or reverse output.

Power Supply:

Current output=10 to 35 VDC;
Voltage output=15 to 35 VDC or 15 to 29 VAC.

Electrical Connection:

Removable terminal block, knocks out for
conduit fitting.

Calibration:

Via pushbuttons using A-449 auxiliary display. Span gas
concentration is field selectable.

Weight:

1 lb (.45 kg).

Agency Approvals:

CE.

Literature

Manuals

• Application & Installation Note
• Instruction Manual

Catalog Pages

Series GSTA Catalog Page

Features

Add optional integral LCD display by adding -LCD to end of model number (Example: GSTA-C-LCD)

Approvals

CE Approval

Drawings

• pdf.pg1
• pdf.pg2
• dwg
• 3D Drawing

Accessories

	Model Number	Description
	A-449	Remote display with mini USB display.
	A-505	Replacement Carbon Monoxide Sensor for GSTA Series, Model CMT200
	A-506	Replacement Nitrogen Dioxide Sensor for GSTA Series
	A-507	Gas calibration Kit for GSTA Series
	GCK-200CO-2000CO2	Gas Calibration Kit (GROUND SHIPMENTS ONLY)

Model Chart