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Oldham Simtronics OLCT 20 Fixed Gas Detector

Oldham Simtronics

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The OLCT 20 series sensors are designed for initial assembly applications, which can be installed in shelters, on skids, for monitoring in very small spaces or for on-board applications.

They are mounted via M25 or 3/4″ NPT threads or a special accessory to ensure a robust mounting without the need for an additional junction box.

The OLCT 20 transmitters provide a 4-20mA output that can be directly connected to PLCs with a maximum current consumption of 100mA at 24VDC.

They are certified ATEX explosion-proof by INERIS. Their IIC T6, makes them perfectly suited for the detection of hydrogen.

The stainless steel detectors offer protection and resistance to corrosive agents. IP 66 rated, they are resistant to dust and water splashes.

The OLCT 20’s pre-calibrated sensors can be disconnected from the holder by rotation. These “smart” sensors can be calibrated on a workbench, outside of hazardous areas.

Catalytic oxidation sensors for combustible gases are specially treated to resist poisons. They benefit from extremely fast response times and total reliability.


  • Stainless steel base
  • Small size
  • Atex certification for H2 applications
  • Pre-calibrated sensor


  • Machine
  • Shelter
  • Small spaces
  • Mobility
  • Refrigeration industry
  • Water treatment

Sensor specifications
Sensor specifications

1 Tool kit (6147869)
2 Calibration cup (6331141) allows introduction of calibration gas on the sensor
3 Bypass adapter (6327910) allows measurement of samples
4 Splash guard system (6329004) protects the detector from liquid projections
5 Remote gas introduction head (6327911) allows gas injection without having to access the sensor
6 Removable protective filter (6335975) protects the sensor against projections and dust
7 Wall mounted collecting cone (6331169) for use with lighter-than-air gases
8 Pitot tube (6793322)

Oldham Simtronics OLCT 20 Fixed Gas Detector


Type XP transmitter
Gas detection principle Catalytic/Electrochemical / Catharometric
Detected gases Flammable, toxics and oxygen
Measuring range see chart
Sensor housing Stainless steel type 316L
Precalibrated sensor YES
Power supply at the detector 15 to 30 VDC
Maximum power consumption 100 mA (catalytic)
Output signal 4-20 mA
Wiring 3 reinforced wires (catalytic)
Load impedance 250 Ω (catalytic)
Depending on power
supply (chemical)
Wiring connection delivered with a 6 mm-diameter cable
Mounting M25 thread or 3/4″ NPT or via accessory
Ingress protection IP66
Certification II 2 GD
Ex db IIC T6 Gb
Ex tb IIIC T85°C Db
T.Amb: -20°C to 70°C INERIS 01 ATEX 0004X
EMC Marking EN 50270:2015 (type 2)
Weight 800 g
Dimensions L 130 x D 60
Operating temperature (for electronics) -25°C to +60°C


Product Data Sheet


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