CTX-300 Gas Detector Transmitter

Designed To Detect Oxygen, Toxic Gases And Refrigerant Gases. 

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  • Features
  • Specifications
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When hazardous levels of toxic gases or oxygen threaten the safety of an unclassified area, the Oldham CTX 300 oxygen fixed gas detector can easily satisfy the most demanding safety requirements. The Oldham CTX 300 fixed gas detector is designed to detect oxygen (O2), toxic and refrigerant gases, and also uses a new sensor for CO2 detection over three different ranges: 0-5000 ppm, 0-5% vol. and 0-100% vol.

The CTX 300 transmits data in record time. With a wide range of sensor options, it has the flexibility to protect many potentially hazardous environments. Maintaining the unit is easy with pre-calibrated sensors and an optional LCD display.

Reduce Maintenance

As the only consumable element, the CTX 300 sensor is easily replaceable. New sensors come pre-calibrated from the factory. So during the sensor exchange, no calibration gas is required, nor adjustments to the detector, or remote central controller are required.
Clear readability
  • Highly sensitive, lighted display allows local reading
  • Effective power-up indication by indicator lights
  • Indication of maintenance or fault function by LED
High-Level technology
  • Pre-calibrated sensor avoiding the need to use unstable gases on site for calibration purposes
  • High-performance semiconductor type detector (detection of freon gas, etc.)
  • Available in an infrared version for CO2
Advanced design
  • Highly resistant to environmental elements
  • Avoids having to use protective covers
  • Use of polycarbonate and stainless steel mounting hardware
  • Resistant to corrosive agents (H2S, HCl, sea spray,…)
  • Durable housing
Specifically adapted options
  • Removable filters, interchangeable without opening the housing (which is dust-proof, condensation-proof and waterresistant)
  • Splash guard
  • Gas collector cone
  • Mounting brackets
  • Pitot tubes, floats, heating protective device, etc.
  • Remote calibration cup

For more information about the CTX 300 Fixed Gas Detector, contact Air-Met Scientific today. 


Oldham Oxygen Detection CTX-300 Features:

  • Detects O2, CO2, toxic and refrigerant gases
  • 4-20 mA output analog transmitter with optional backlit display
  • Plug-in and pre-calibrated sensors
  • Available with electrochemical, infrared or semi-conductor sensors
  • More than 30 different sensors are available to detect most toxic gases in the industry
  • Available in an infrared version for CO2
  • EN14624 compliant with regards to R134a monitoring
  • Oxygen detector for commercial or industrial applications in unclassified areas
CTX 300 Fixed Gas Detection Technical Specifications
Polycarbonate housing
4-20 mA output analog transmitter
Display: Highly visible backlight display unit (optional, gas dependent)
Visual Indicators: (on CTX 300: 3-wire)
In operation: green color
Failure / maintenance : orange color
2 wires 9/10 screened cable – CTX 300 without display unit
3 wires screened cable – CTX 300 with display unit
Cable entry: outer diameter: 6 to 11 mm, PG9 cable gland
Power supply: 15 to 32 V DC
Power consumption:
CTX 300 without display: 60 mA
CTX 300 with display: 110 mA
CTX 300 without display semiconductor versions: 100mA
Operating temperature:
without display: -40°C to +50°C (-40°F to +122°F), sensor dependent
with display: -20°C to +50°C (-4°F to +122°F), sensor dependent
Ingress Protection: IP 54, NEMA 3 & 3R
Weight: 520 g (18.2 oz)
130 x 136 x 69 (lxhxd) in mm (5.12" x 5.35" x 2.72")
Certification: Safe area only
EMC according to EN 50270:06
CSA CLASS 812 86, CLASS 4812
06 (SIGNAL APPLIANCES) all versions
exept CO2 versions
32 ohms max loop for CTX 300 with display unit and for semiconductors sensor versions
64 ohms max loop for CTX 300 without display unit