The 22G03-5B is a Belimo factory-calibrated Carbon Monoxide gas monitor using a hydrogen-filtered (NilH2) electrochemical sensor that suppresses hydrogen cross-sensitivity — useful where H₂ from battery charging or fuel-cell equipment would otherwise bias a standard CO sensor. This is the B variant: two SPDT relays plus CAN bus and BACnet MS/TP. Measuring range is 0-250 ppm, with the standard 22G three-level alarm (visual + 80 dB audible).
Standard CO variants (non-filtered sensor): 22G02-5A, 22G02-5B, 22G02-5C. Pairs with communication/relay modules C-22G-5A, C-22G-5B, C-22G-50 and 24 VAC transformers A-22G-A50, A-22G-A100.
Carbon Monoxide life-safety monitoring in environments with hydrogen present — battery rooms, forklift charging areas, and fuel-cell installations — where H₂ cross-sensitivity must be suppressed.
This SKU was carried over from the legacy catalog as a NilH2 CO B-model. Detailed specifications (exact sensor module part number, accuracy, certifications) are pending the category-wide audit against the manufacturer datasheet and are not yet reproduced here.
Technical Specifications
| Specification | Detail |
|---|---|
| Measured Gas | Carbon Monoxide (CO) |
| Measuring Range | 0-250 ppm |
| Sensing Technology | Hydrogen-filtered (NilH2) electrochemical |
| Output Configuration | 2 Relays + CAN bus + BACnet MS/TP |
| Relay Output | 2 × SPDT, 5 A @ 125 VAC, non-inductive |
| Communication | CAN bus + BACnet MS/TP |
| Alarm Levels | 3-level (visual L1/L2 + visual + 80 dB audible L3) |
| Display | LCD with backlight |
| Power Supply | 24 VAC/VDC |
| Enclosure Rating | NEMA 2 |
| Certifications | cULus to UL 2075 (verify in audit) |
| Manufacturer | Belimo |
| Manufacturer Part Number | 22G03-5B |
| Warranty | 5-year factory warranty |
Documentation
Frequently Asked Questions
What makes the 22G03-5B different from the 22G02-5B?
Both are CO monitors. The 22G03 uses a hydrogen-filtered (NilH2) electrochemical sensor that suppresses H₂ cross-sensitivity, making it suited to spaces with hydrogen present (battery charging, fuel cells). The 22G02 uses the standard CO electrochemical sensor.
What does the B variant provide?
Two SPDT relays plus CAN bus and BACnet MS/TP — dual-relay sequencing with native BMS integration.
- Sensor Type:
- Gas Monitor / Life-Safety
- Measured Gas:
- CO
- Gas Detection Range:
- 0-250 ppm
- Sensing Technology:
- Hydrogen-filtered (NilH2) Electrochemical
- Variant Tier:
- B
- Output Configuration:
- 2 Relays + BACnet
- Communication:
- CAN bus + BACnet MS/TP
- Number of Relays:
- 2
- Alarm Configuration:
- 3-level (Visual L1/L2 + Visual+Audible L3)
