Gas detection is a critical component in industrial safety and environmental monitoring. For accurate and reliable performance, the B12 Gas Transmitter offers a versatile and robust solution. Whether you’re looking for real-time gas monitoring in ambient air or ducted systems, the B12 is built to meet a wide variety of applications with flexibility, precision, and ease of use.
What Is the B12 Gas Transmitter?
The B12 is a loop-powered, two-wire 4–20 mA gas transmitter designed to output a signal that’s linearly proportional to gas concentration. It operates primarily from a 24 VDC power supply, and can handle output loads up to 675 ohms, making it suitable for most standard monitoring systems. For low-power or remote installations, the transmitter can also operate from 12 VDC, though with a reduced load capacity.
Sensor Technology & Applications
The B12 utilizes electrochemical sensors that are ideal for detecting toxic gases in ambient air or ventilation ducts. However, they are not recommended for use in extremely dry environments or condensing gas streams.
- Sensor Location: Installed in one of the pre-designed knockouts, with additional knockouts for flexibility.
- Optional Configurations:
- Separated Sensor (up to 25 ft away)
- Duct Insertion Sensor with mounting adapter
- Explosion-Proof Sensor Flowcell (Part No. 00-0298)
B12 Transmitter: Setup, Dimensions, and Design
The standard configuration places the sensor close-coupled to a NEMA 4X polystyrene enclosure, built for durability and general industrial use.
For environments requiring explosion protection, a galvanized steel explosion-proof enclosure is available. Be sure to specify this option when ordering by selecting it under Enclosure Options.
Optional LCD Display
You can add an LCD display on the face of the enclosure to view real-time gas concentrations.
Note: The display must be ordered at the time of purchase—it cannot be added later.
B12 Ordering Options
Customize your B12 based on your application needs:
Sensor Module:
- Choose from a wide list of gas types (see chart below)
- Standard, minimum, and maximum detection ranges are available
- Custom calibration ranges available for $50 extra
Display & Enclosure:
- Standard NEMA 4X
- Explosion-proof (no display option)
- Explosion-proof with dual condulet (for remote sensor)
- LCD Display (standard enclosure only)
- Separated Sensor (with 25-ft cable)
- Duct Insertion Sensor
- LCD Display + Separated Sensor
- LCD Display + Duct Sensor
Specifications at a Glance
| Feature | Specification |
|---|---|
| Accuracy | ±5% of reading (depends on calibration gas) |
| Repeatability | ±1% |
| Linearity | ±0.5% |
| Drift | <1% full scale/month (zero), <3%/month (span) |
| Output | 4–20 mA (loop-powered), up to 750 ohms at 24 VDC |
| Power Supply | 12–30 VDC |
| Display | Optional LCD |
| Controls | Zero & span pots on board |
| Operating Temp | -30°C to +55°C (-10°C min for O₂) |
| Enclosure | NEMA 4X or Explosion-proof (Class I, Div 1, Groups B, C, D) |
| Sensor Pressure | 7–30 PSIA (0.5–2 bar) |
| Calibration | Annual sensor replacement recommended |
Common Gas Sensor Ranges
| Gas | Min Range | Max Range | Standard Range |
|---|---|---|---|
| Ammonia | 0–100 ppm | 0–2000 ppm | 0–100 ppm |
| Carbon Monoxide | 0–100 ppm | 0–1000 ppm | 0–100 ppm |
| Chlorine | 0–1 ppm | 0–200 ppm | 0–10 ppm |
| Hydrogen Sulfide | 0–10 ppm | 0–500 ppm | 0–50 ppm |
| Oxygen | 0–5% | 0–30% | 0–25% |
| Sulfur Dioxide | 0–10 ppm | 0–200 ppm | 0–20 ppm |
| … and many more. Contact us for the full list or for custom calibration options. |
Wireless Monitoring & Data Logging Kit
Upgrade your fixed gas monitoring system with remote access via the Wireless Monitoring & Data Logging Kit. Connect to the internet, receive instant text and email alerts, and track historical data from anywhere.
Conclusion
The B12 Gas Transmitter is a powerful and customizable tool for detecting a broad range of gases in diverse industrial environments. Whether your needs call for standard ambient monitoring, duct insertion, explosion-proof safety, or wireless data logging, the B12 has an option for you.
You can find this product here: https://www.gas-sensing.com/catalog/product/view/id/1487/s/b12-gas-transmitter/category/36/
