Crowcon IR Plus Infrared Gas Detector

Name: Crowcon IR Plus Infrared Gas Detector – Datasheet & Quote
Brand: Crowcon
SKU: IR Plus

A dual-beam infrared hydrocarbon detector with heated optics

The Crowcon IR Plus is a dual-beam infrared point detector for hydrocarbon gases, built in 316L stainless steel for harsh environments. Its intelligent heated optics and Stay-clIR hydrophobic mirror keep the optical path working in high temperature and humidity, and the datasheet gives a 4 second T90 response and a 5-year manufacturer warranty. It is software-configurable to the target gas: hydrocarbon, methane, propane, ethylene, with hexane and butane pending.

Outputs are 3-wire 4-20 mA (sink or source) and RS-485 Modbus as standard, with HART 7 optional. A dirty-optics warning is sent as 2 mA at 75% obscuration (configurable) and a 0 mA fault at 90%. The detector is SIL2 certified to IEC 61508 and EN 50402.

Technical specifications

Parameter	Specification
Manufacturer / model	Crowcon, IR Plus infrared gas detector with intelligent heated optics
Target gases	Hydrocarbon (software-configurable), methane, propane, ethylene; hexane and butane pending
Detection principle	Dual-beam infrared; heated optics with Stay-clIR hydrophobic mirror
Response time (T90)	4 seconds
Performance	Zero drift plus/minus 2% FSD per year; repeatability plus/minus 2% FSD; linearity plus/minus 2% FSD
Operating voltage / power	12 to 30 V DC; 5.5 W maximum with heater on
Outputs	3-wire 4-20 mA sink or source; RS-485 Modbus; HART 7 optional; 2 mA dirty-optics warning and 0 mA fault; fault signal below 3.6 mA and/or above 21 mA
Operating temperature / humidity	-40 to +70 C; 0 to 100% RH including condensing
Enclosure / protection	316L stainless steel; IP66 (EN 60529)
Cable entries	2 x M20 or 2 x 3/4 in NPT
Size	194 x 119 x 94.2 mm
Weight	4.1 kg; 4.5 kg with fixed display; 4.9 kg with IS barrier module; remote display 0.2 kg
Display options	No display, fixed display, IS barrier, IS barrier with remote display (up to 3 m); local HART
Mounting options	Wall, pipe, duct, junction box
Functional safety	IEC 61508, EN 50402, SIL2
Performance standards	IEC EN 60079-26-1, FM 6310, FM 6320, ANSI/FM/UL 60079-29-1
Approvals	ATEX, IECEx, INMETRO, CCC, PESO, ECAS, FM
EMC	EN 50270, FCC CFR47 Part 15B, ICES-003
Manufacturer warranty	5 years

Where infrared suits and what limits it

Infrared hydrocarbon detection does not rely on a catalytic bead, so it is not poisoned by silicones, sulphur compounds or lead, and it works in oxygen-free atmospheres. It detects hydrocarbons but not hydrogen, which has no infrared absorption in this band; use a catalytic or other sensor for H2. Fouling of the optics is the main failure mode, which is why the IR Plus reports obscuration and gives the dirty-optics warning before a blind detector.

Remote, non-intrusive testing is supported by the fixed display, a remote display up to 3 m or local HART, which avoids opening the enclosure in the hazardous area.

What to confirm before ordering

State the target gas and calibration gas, display option, mounting kit, cable gland thread, whether the IS barrier module is required, and the approval scheme (ATEX, IECEx, FM, INMETRO, CCC or PESO). Hexane and butane configurations are pending release per the datasheet.

Documents and quotation

The attached Crowcon datasheet gives the full IR Plus specification. Send the gas, display, output and certification requirement for a quotation. See more fire and gas detectors.

Crowcon portable detectors listed here

The Gasman is a single-gas personal detector, worn by one person to warn of one hazard such as hydrogen sulfide, carbon monoxide, flammable gas or low oxygen. The Gas-Pro is a multi-gas detector for confined space entry that monitors up to five gases and can be ordered with an internal pump for pre-entry sampling. In both cases the sensor fit is chosen at the time of order.

Ordering Crowcon detectors: what we need

Send the gases and ranges you need, the alarm levels if they differ from the manufacturer's defaults, and for a Gas-Pro if the pumped version is wanted. For spare sensors, send the detector model, serial number and the gas. Add chargers, sampling kits or test accessories to the same inquiry. Contractors in the GCC should state the approval marking their site permit system asks for.