Product Overview
GasTech 57-7210 Fixed-Point Gas Detection Transmitter Module with Integrated Alarm and 4-20mA Output
Condition
Unused NOS. Label markings legible: GASTECH P/N 57-7210, 12-28V DC, ZERO and SPAN trimpots, TEST+/- points, FB marker, barcode 99250092. Includes GasTech 24-0298 sensor housing and receptacle (PCB marked 24-0298 REV B, GAS TECH 0399, serial 9071572122364); no gas sensor is included. Sourced from a government research facility.
Carefully packed and shipped same or next business day from our Idaho warehouse. Online since 1999. Honest equipment and straightforward service.
A no-hassle satisfaction guarantee on every order.
Product Overview
GasTech 57-7210 (also listed as 57-7210-01) is a potted sensor amplifier and fixed-point diffusion transmitter module designed for continuous toxic and oxidizing gas monitoring. Manufactured by GasTech, a Thermo Fisher Scientific brand, it conditions raw sensor signals and outputs an industry-standard 4-20mA analog loop signal alongside integrated alarm circuitry. The fully potted construction provides robust environmental sealing suited to harsh industrial deployment.
Key Features
- Input voltage: 12-28V DC
- Output: 4-20mA analog industrial transmitter signal
- Integrated alarm circuitry (W/ALARM configuration)
- Fully potted construction for environmental sealing
- ZERO and SPAN trimpots accessible on PCB for field calibration
- TEST+/- test points on PCB for loop verification
- Winchester-style 7-pin sensor receptacle (GasTech 24-0298 housing included)
- Supported gases: Cl2, ClO2, F2, HF, NO2, O3 (toxic and oxidizing gas types)
- Machined aluminum sensor housing with louvered diffusion face and O-ring sealed body joint
Applications
- Replacing a failed sensor amplifier in an existing fixed gas detection system - isolate the zone, swap the module, reconnect to the 4-20mA loop, and calibrate ZERO and SPAN before returning the point to service
- Maintaining toxic gas monitoring at chemical processing facilities where Cl2, HF, or NO2 exposure monitoring is a continuous safety requirement
- Integrating a pre-engineered, potted transmitter module into a new gas detection panel design, bypassing the need to design environmental protection and signal conditioning from scratch
- Commissioning a fixed-point detector at a water treatment plant where oxidizing gas (O3, ClO2) monitoring feeds a SCADA system via 4-20mA
- Extending the service life of a GasTech SafetNet or similar legacy gas detection network by replacing the signal-conditioning module rather than retiring the entire detection point
Frequently Asked Questions
Is a gas sensor included with this module?
No gas sensor is included. This listing includes the 57-7210 potted amplifier module and the GasTech 24-0298 sensor housing with receptacle. A compatible electrochemical or similar gas sensor for your target gas (Cl2, ClO2, F2, HF, NO2, or O3) must be sourced separately.
What power supply does the 57-7210 require?
12-28V DC, confirmed on the module label. The module is incompatible with power supplies outside this range.
Will this module work with my existing 4-20mA control system?
If your control system accepts a standard 4-20mA analog loop input, this module is compatible on the output side. Confirm that your controller can interpret the alarm relay or digital telemetry outputs as well if those functions are part of your installation.
How do I calibrate the module after installation?
ZERO and SPAN trimpots are accessible on the PCB. TEST+/- points are also present for loop verification. Calibration procedure should follow the system documentation for your specific installation.
Is this the same as part number 57-7210-01?
Yes. The 57-7210 and 57-7210-01 designations refer to the same module and are used interchangeably across industrial surplus and distributor listings.
Toxic gas detection is not a place for improvisation - but finding a discontinued NOS module in the exact configuration a live system still needs is exactly the kind of find that keeps a safety-critical installation running without compromise. The ZERO and SPAN trimpots are ready. The rest is up to your sensor and your process.
