Compur Statox LC IR and MC IR

Combustible Gas Detection – upgrade to the upper class!

Monitoring the environment for explosive gases most of the time you would be looking for hydrocarbons. It is a characteristic of hydrocarbons that they have a number of C – H bonds. These bonds absorb infrared light at a wavelength of 3,4 mm ( unsaturated hydrocarbons absorb at 3,3 mm ). This effect can be used to reliably detect these substances

The most important advantage is that infrared detectors are resistant against catalyst poisons and high concentrations. They can even be used in oxygen free atmosphere.

Another important advantage of this technology is that a failure cannot go unnoticed. If an important component such as the lamp or the detector fails, the system will recognise this as 100 % absorption (an alarm situation). Most infrared gas detectors are designed as so – called NDIR (Non Dispersive Infra Red) double- beam detectors. This means, the light beam is divided in two portions with different wavelengthes. One is the measuring beam that will be absorbed by gas, the other is a reference beam at a wavelength that will not be absorbed by gas. This beam compensates for intensity variations of the lamp, dirt and corrosion. As the optics are mostly self maintained, an eventual inspection only checks if there is gas access to the sensor. Therefore much longer maintenance intervals compared to the catalytic sensor can be justified. As a rule of thumb, twice as long is OK.

For plants which already have installed a combustible gas detection system, there is now a chance for a very cost- effective upgrade: The Statox 501 LC IR or LC MR!

It consists of an EEx e (enhanced safety) terminal box and a sensor with integrated electronics. This sensor operates at the same supply voltage as a catalytic sensor. Its output signal is also identical to the signal of a catalytic sensor! This new innovative technical approach keeps the price in the same ballpark as catalytic sensors!

All advantages of an infrared gas detector are now available for nearly the same price as a catalytic sensor and existing gas detection systems can now be upgraded without replacing the existing hardware.

Of course the miniaturised chip inside the sensor cannot provide the same powerful electronics and software package as a high- end instrument, but however the new Compur Statox 501 IR LC features the most important advantages of an infrared system. So the next time maintenance is due with your gas detection system, check with Compur Monitors. The investment for an upgrade might pay back within one maintenance interval.

Sensor Head for combustible Gases  Technical Data IR LC  Technical Data MC IR
 Detectable Gases  Methane  Hydrocarbons
 Measuring Range  0 – 100 % LEL Methane  0 – 100 % LEL other hydrocarbons
 Measuring Principle  Infrared Absorption  Infrared Absorption
 Sensor Type  NDIR 2 – Channel  NDIR 2 – Channel
 Detectable Limit  2 % LEL Methane  2 % LEL
 Response Time  t90 < 30 s   t90 < 30 s
 Temperature Range  – 20 to + 60°C  – 20 to + 60°C
 Humidity  0 – 95 % r. H.  0 – 95 % r. H.
 Pressure  700 – 1300 hPA  700 – 1300 hPA
 Voltage  3,0 to 5,90 V DC  3,0 to 5,90 V DC
 Current  80 mA   80 mA
 Connection  3 – Wire  3 – Wire
 Operation  With Statox 503 Controller  With Statox 503 Controller
 Weight  580 g  580 g
 Display  –  –
 Output Signal  Same as catalytic Sensor  Same as catalytic Sensor
 Enclosure  IP 54   IP 54
 Approval  Ex db eb IIC T6 Gb  Ex db eb IIC T6 Gb
 Dimensions  110 x 130 x 60 mm  110 x 130 x 60 mm
 Weight  580 g, 20,5 oz  580 g, 20,5 oz
 Max. Distance  750 m 3-Wire, 3000 m 5-Wire  750 m 3-Wire, 3000 m 5-Wire