Dwyer GSTA-C CO Transmitter - Official Dwyer Vietnam

Dwyer GSTA-C Carbon Monoxide Transmitter for Parking Garages and HVAC Ventilation

Posted on: 03/07/2026

Monitoring Carbon Monoxide (CO) concentration is a mandatory requirement in modern commercial garage ventilation designs. To address this need, Dwyer (USA) delivers the high-performance cảm biến đo nồng độ khí CO coded GSTA-C. This rugged gas transmitter provides exceptional field accuracy and reliable signal transmission.

Operating Principle of the Dwyer GSTA-C Sensor

The Dwyer GSTA-C transmitter utilizes field-proven electrochemical sensing cell technology. When toxic CO molecules diffuse through the front membrane into the chamber, an oxidation-reduction reaction occurs at the electrodes, creating a micro-current directly proportional to the gas concentration. Dwyer's integrated circuitry processes this current and converts it into standard analog outputs (4-20 mA or 0-5/10 V). This technology delivers high sensitivity while maintaining a minimal annual drift rate of less than 5% under standard operational conditions.

Four Typical Application Scenarios in Building Projects

Commercial & Residential Parking Basements: Installing the Dwyer GSTA-C transmitter at breathing height enables continuous exhaust gas monitoring. The transmitter routes real-time data to the central BMS to activate jet fans only when gas levels exceed safety limits, dramatically lowering energy consumption.
Logistics Hubs and Loading Docks: In semi-enclosed facilities where LPG or gasoline forklifts operate frequently, the Dwyer GSTA-C transmitter interfaces directly with local stroboscopic horn assemblies, providing immediate workplace safety warnings for crews.
Mechanical Plant Rooms and Generator Enclosures: Deploying the Dwyer GSTA-C gas transmitter in boiler rooms and backup generator spaces ensures early leak detection. With a response time of t90 < 45 seconds, it triggers emergency ventilation before hazardous buildup occurs.
Traffic Tunnels and Subterranean Corridors: The duct-mounted variant of the Dwyer GSTA-C transmitter utilizes factory pitot tubes to sample airflow inside exhaust ducts, sending accurate data to control massive fresh air intake grids.

Key Technical Advantages of the GSTA-C

Field-Replaceable Sensor Element: The transmitter’s modular architecture allows maintenance technicians to replace only the internal electrochemical cell after its 2-to-4-year lifespan, reducing long-term lifecycle costs.
DIP Switch Selectable Outputs: Hardware switches on the circuit board allow field selection between 4-20 mA current loop or 0-5 V / 0-10 V voltage signals, matching any automation controller (DDC) configuration.
Selectable Measuring Ranges: Field technicians can easily toggle the full-scale monitoring range between 0-200 PPM and 0-500 PPM via jumper configurations to fulfill project compliance standards.
Heavy-Duty Enclosure: Constructed from UV-resistant glass-filled polycarbonate, the enclosure completely shields internal electronics against impact, moisture, and industrial wear.

Technical Specifications Summary

Technical Parameter	Specification Value (Dwyer Official Datasheet)
Manufacturer & Origin	Dwyer Instruments (USA)
Model Designation	GSTA-C (Standard wall-mount CO transmitter)
Target Gas Type	Carbon Monoxide (CO)
Range Selection	Field-selectable 0 to 200 PPM or 0 to 500 PPM
System Accuracy	±2% Full Scale at the time of calibration
Resolution Rating	1 PPM
Power Supply	Current: 10-35 VDC; Voltage: 15-35 VDC or 15-29 VAC
Output Signals	4-20 mA (2-wire loop-powered) or 0-5 V / 0-10 V (3-wire)
Response Time (t90)	< 45 seconds
Operating Temperature	-4 to 122°F (-20 to 50°C)
Operating Humidity	15 to 90% RH continuous; 0 to 99% RH intermittent
Housing Rating	UV resistant glass-filled polycarbonate, IP30 rated

Configuration and Model Selection Guide

The Dwyer gas transmitter line is offered in three distinct configurations to suit various spatial setups:

Dwyer GSTA-C: Standard wall-mount configuration featuring a tamper-resistant solid cover, ideal for public garages to prevent local modification.
Dwyer GSTA-C-LCD: Premium wall-mount configuration equipped with an integrated LCD digital display for instant safety check-ups.
Dwyer GSTA-C-D: Engineering duct-mount configuration, fully packaged with localized pitot tube sampling accessories.