OLC 100/ OLCT 100


The OLC100/OLCT 100 range of fixed detectors has been designed for detection of combustible gases, toxic gases or oxygen. Available in explosion-proof or intrinsically safe versions, the OLCT 100 is suitable for detection of all gases in ATEX zones.

the OLC100/OLCT 100 offers an infrared sensor, which allows it to be used in more severe environmental conditions, where the presence of poisons could harm the use of a catalytic sensor. With this new line of detectors, Oldham broadens its product range with products that combine reliability, durability and ease of use.

  • 4-20 mA analog transmitter without display;
  • SIL2 capability for LEL, O2, CO, H2S, NH3, CO2;
  • Detects combustible, toxic or refrigerant gases and O2;
  • Available with electrochemical, infrared or semi-conductor sensors;
  • Designed for industrial applications;
  • Available in explosion-proof or intrinsically safe versions, and stainless steel;
  • A high-temperature version allows operation up to 200 °C.

Sensor type: catalytic filaments, infrared, electrochemical or semiconductor depending on target gas

Material: Case made of epoxy-coated aluminium (optional 316L stainless steel). Sensor: 316L stainless steel

IP Rating: IP66

Cable entry: M20 or ≤ NPT

Power supply:15.5 to 32 VCC

4-20 mA linear output (OLCT100 series):

  • usual source encoded from 0 to 23 mA (not isolated)
  • linear 4 to 20 mA output, reserved for measurement
  • 0 mA: electronic fault or no power supply
  • < 1mA: fault – 2 mA: initialization mode
  • > 23 mA: out of range

OLCT100 series output: 340 mA Wheatstone bridge

  • Complies with ATEX 94/9/CE European Directive and IECEx scheme for explosion-proof detectors.
  • OLC100, OLCT100-XP, OLCT100-XP-IR : ATEX II 2 GD / Ex d IIC T6 Gb / Ex t IIIC T85°C Db IP66
  • OLCT100-IS : ATEX II 2 GD / Ex ia IIC T4 / Ex ia D 21 T135°C IP66
  • SIL 2 according to EN 50402 / EN 61508 for catalytic, infrared, O2, CO, NH3 and H2S versions