Dwyer GSTA-C Carbon Monoxide Transmitter – Toxic Gas Monitoring Solution for Underground Garages
Posted on: 21/07/2026
Underground parking garages and building basements always pose high risks of carbon monoxide (CO) accumulation from vehicle engine exhaust – a colorless, odorless gas that is extremely hazardous if concentration levels exceed safety thresholds. Dwyer's GSTA-C CO transmitter is a
specialized device that provides continuous monitoring and timely safety warnings to protect building occupants.
Introduction to GSTA-C Transmitter
The GSTA-C utilizes a field-replaceable electrochemical sensor designed specifically for measuring ambient CO gas concentrations, while also supporting nitrogen dioxide (NO2) sensing options. The transmitter outputs industry-standard electrical signals, allowing seamless integration into ventilation fan controllers or Building Management Systems (BMS) to automatically activate exhaust fans whenever gas levels exceed safe limits.
Technical Specifications
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Parameter
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Details
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Product Line
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GSTA-C
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Manufacturer
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Dwyer (DwyerOmega) – American brand
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Sensor Type
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Field-replaceable electrochemical sensor, average lifespan of 2 years
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Measurement Range
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CO: selectable 200 or 500 PPM; NO2: 10 PPM
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Accuracy
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CO: ±2% FS; NO2: ±3% FS (at time of calibration)
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Resolution
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CO: 1 PPM; NO2: 0.1 PPM
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Signal Drift
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Less than 5% per year in ambient air
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Coverage Area
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5,000 – 7,500 ft² (approx. 465 – 700 m²) per sensor
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Response Time
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Less than 45 seconds (CO) and less than 25 seconds (NO2) to 90% of final reading
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Operating Temperature
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-4 to 122°F (-20 to 50°C)
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Operating Humidity
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15–90% RH continuous; 0–99% RH intermittent
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Output Signal
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4-20 mA, 0-5 VDC, or 0-10 VDC (selectable upon ordering)
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Power Supply
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10-35 VDC or 15-35 VDC / 15-29 VAC
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Enclosure Rating
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IP64
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Certifications
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CE
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Installation and User Guide
Step 1: Select an installation location adhering to the manufacturer's recommended mounting height, typically near vehicle traffic corridors or primary airflow pathways in underground basements, avoiding direct strong drafts that could alter readings.
Step 2: Determine the total quantity of sensors required based on coverage area (approx. 465–700 m² per sensor) to ensure uniform monitoring across the facility.
Step 3: Connect the power supply and output signal wiring strictly according to the wiring diagram in the included technical manual, routing signals to fan control panels or the BMS.
Step 4: Configure alarm thresholds (span/zero calibration) per building safety standards using integrated pushbuttons or an optional calibration LCD module.
Step 5: Perform system trial commissioning: verify output signal response to changing gas concentrations, confirming ventilation fans trigger at designated thresholds.
Step 6: Schedule periodic replacement of the electrochemical sensor module based on its expected service lifespan (approx. 2 years) to maintain long-term accuracy.
Note: Electrochemical sensor modules have a finite operational lifespan and require periodic replacement; spare sensor modules should be stored at 0–20°C to preserve shelf life before deployment.
Practical Applications
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Carbon monoxide (CO) gas monitoring in underground parking garages and multi-story building basements.
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Automatic demand-controlled ventilation fan operation based on real-time measured gas levels to reduce energy consumption.
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Industrial facilities, workshops, and logistics warehouses operating internal combustion engine vehicles.
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Occupational health and safety alarm systems in environments prone to toxic gas accumulation.
Why Choose GSTA-C at DLK?
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100% genuine Dwyer products imported directly with complete CO/CQ documentation.
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Technical engineering consultation to calculate optimal sensor quantity and mounting layout based on project floor area.
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Comprehensive supply of catalogs, user manuals, and technical datasheets required for fire safety and building compliance approvals.
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Long-term support providing replacement electrochemical sensor modules when lifespan expires, ensuring continuous system protection