VOC & freons 4-20 mA detector transmitter - CTX300

Starting at $819.04

Gas detector transmitter with 4-20 mA linear output for detecting toxic or asphyxiating gases in safe areas (non-ATEX). Large range of available sensors to detect many gases. Optional digital display integrated to the detector for local measure readout. Detailed description

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Gas detector-transmitter


Particularly well-suited for laboratories, research centers, agri-food industries or medical sector (clean rooms, MRI, cryonics cells…), the CTX300 gas detector-transmitter with 4-20 mA analog linear output is well known in the gas detection sector. As it is compact, rugged and user-friendly, this gas detector is highly versatile.


Conçu pour détecter l'oxygène (ou plutôt le manque d'oxygène), certains gaz rares (argon, hélium), les gaz toxiques, la plupart des gaz réfrigérants et certains composés organiques volatils (COV), le détecteur gaz CTX300 dispose d'une large gamme de cellules pré-calibrées en usine et répond aux besoins de la plupart des applications industrielles en zones non classées (zones NON ATEX).


CTX300 gas detector assets


  • Detection of toxic gases, oxygen and major freons
  • Analog transmitter, 4-20 mA output, optional backlit display
  • Pre-calibrated sensors 
  • Highly resistant to environmental elements, built-in sensor for enhanced protection
  • Available in electrochemical, infrared or semiconductor versions
  • Reduced maintenance: factory pre-calibrated interchangeable CTX300 sensor
  • Use of polycarbonate and stainless steel mounting hardware, resistant to corrosive agents (H2S, HCl, spray…) and high mechanical resistance


CTX300 detector technical specifications


  • Gas detection: C2H4O, Cl2, ClO2, CO, CO2, COCl2, H2S, HCl, HCN, He, HF, NH3, NO, NO2, O2, O3, PH3, SiH4, SO2, VOC (methylene chloride, methyl chloride , toluene, trichloroethylene, xylene, ethanol), freons (R12, R22, R123, R134a, R142b, R11, R23, R141b, R143a, R404a, R507, R410a, R32)
  • Enclosure: Polycarbonate housing
  • Function: 4-20 mA analog output detector-transmitter
  • Display: Highly visible backlight display unit (on option)
  • Indicator lights (on CTX300 display version): in operation: green, failure / maintenance: orange
  • Link:
    - CTX 300 without display unit: 2 wires
    - CTX 300 with display unit, CO2 and semiconductor versions: 3 wires
  • Cable inlet: Between 6 and 11, gland PG9
  • Power supply: 15 to 32 VDC
  • Power consumption:
    - CTX 300 without display unit: 60 mA
    - CTX 300 without display unit: 110 mA
    - CTX 300 without display unit equipped with semiconductor sensor: 100 mA
  • Sealing: IP 54, NEMA 3 & 3R
  • Dimensions: 130 x 136 x 69 (l x h x d) in mm 
  • Certification: safe area only


CTX300 gas transmitter main applications


  • Laboratories and research centers
  • Pharmaceutical industry
  • Agri-food industries, refrigerant systems
  • Medical sector, Secteur médical, MRI rooms, cryonics cells
  • Wine-growing sector, wineries, breweries, cellars



More Information
Manufacturer Oldham

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