GFG · Germany · Fixed systems
IR29 i
IR29 i transmitter: intrinsically safe infrared combustible gas detector (no display)
Intrinsically safe Ex ia IIC T4 Ga NDIR transmitter for combustible gases and vapors 0-100% LEL, without a local display.
Description
About IR29 i
IR29 i is a combustible gas transmitter using non-dispersive infrared (NDIR) technology with a GfG-patented 4-beam 4-wavelength design. The 'i' designation indicates intrinsic safety protection to ATEX II 1G Ex ia IIC T4 Ga, which allows installation in Ex zone 0 hazardous areas. The IR29 i version has no local LCD; if the measured value needs to be shown at the unit, choose the IR29 Di. The 4-20 mA output signal is wired through the SB1 safety barrier to the GMA control panel.
Key features
- 4-beam 4-wavelength NDIR principle with a gold-plated measuring chamber, selective measurement of combustible gases without the need for oxygen
- ATEX II 1G Ex ia IIC T4 Ga certification, usable in Ex zone 0 hazardous areas
- V4A stainless steel and polycarbonate housing, IP67 protection rating
- Sensor head can be removed and fitted inside Ex zone 0 without disconnecting power
- Analog 4-20 mA output signal, wired through the SB1 safety barrier or a Zener barrier
- Not poisoned by silicone, sulfide or tetraethyl lead, unlike traditional catalytic sensors
Specifications
Technical data
| Measuring principle | Non-dispersive infrared NDIR, 4-beam 4-wavelength |
|---|---|
| Measuring range | 0-100% LEL or 0-100% by volume CH4; 0-5% CO2 |
| Signal output | 4-20 mA |
| Power supply | 15-30 V DC, 0.6 W |
| Ex certification | ATEX II 1G Ex ia IIC T4 Ga / I M1 Ex ia I Ma (BVS 11 ATEX E 164) |
| Enclosure and protection rating | V4A stainless steel + polycarbonate, IP67 |
| Operating temperature | -20 to +55 °C |
| Response time t90 | 35-50 seconds |
