IR29 B Transmitter
With Modbus and infrared sensor for flammable gases and CO2
If flammable gases and vapors or carbon dioxide are to be monitored in Ex zones, the IR29 B transmitter is a reliable and robust solution. The IR29 B transmits measured values and status displays via the RS-485 interface with Modbus protocol. Gases are monitored either on-site by diffusion or via pressureless gas supply with a flow adapter. In combination with GfG's proven controllers, installation in new gas detection systems as well as retrofitting in existing systems is possible.
The IR29 B uses non-dispersive infrared (NDIR) sensor technology to detect combustible gases and vapors as well as carbon dioxide. For selective measurement results without false alarms, our patented 4-beam and 4-wavelength technology with gold-plated mirror optics is used, which dispenses with beam splitters altogether. The infrared sensors used detect up to three gases simultaneously and also enable measurements above the lower explosion limit (LEL), do not require oxygen and are insensitive to sensor poisons. The long-life sensors make the IR29 B a permanently reliable solution for detecting a wide range of combustible gases and vapors in the measuring ranges 0 to 100 % LEL as well as CO2 in the measuring range 0 to 10 % by volume. Automatic temperature compensation and linearization of the measurement signals ensure high measurement accuracy.
Communication and service
Signals are transmitted via the digital RS-485 interface (Modbus). Operating states are indicated by the transmitter via two status LEDs. Service and adjustments are carried out on site using the optional RC2 remote control (one-man adjustment). Self-monitoring of the IR29 increases device safety between maintenance intervals. Measured values and events are automatically recorded by the transmitter in an internal ring buffer. Test gases can be added for function control and adjustment using a calibration adapter.
Safety and instrument protection
The IR29 B is ATEX-certified for use in Ex zone 1. It meets the standards of increased safety "e" and encapsulation "m". The housing made of V4A stainless steel and poly-carbonate is protected against the ingress of dust and water (protection class: IP67). Accessories include a guard plate and dust filter.
Key features at a glance:
- Measuring principle: infrared (IR)
- for combustible gases and vapors, carbon dioxide
- insensitive to sensor poisons
- expected sensor lifetime: 6 years
- signal transmission: RS-485 (Modbus)
- protection class: IP67
- integrated data logger
Approvals / Certifications:
- ATEX certification: II 2G Ex eb mb ib [ib] IIC T4 Gb
- pressure and humidity sensors, ex-proof control unit RC2, impact protection, flow adapter, calibration adapter, protection plate, dust filter, weatherproof housingflow adapter