Gas Detection For Life

Leading gas detector manufacturer


RKI banner

Diffusion Sensor/Transmitter


GD-K8A Diffusion Sensor/TransmitterThe GD-K8A is a diffusion style toxic gas detection transmitter ideally suited to meet your toxic gas detection needs. You can choose from a wide variety of toxic sensors to install in this model. The GD-K8A is an ideal solution for many toxic gas monitoring applications. The low profile design is only 1.5 inches thick and is easy to install. The hinged housing makes it easy to maintain. This transmitter can be installed with any RKI controller, or integrated to existing PLC or DCS system via 4-20mA output (24VDC two-wire, loop powered).

The sensors for the GD-K8A are aged and tested over a one to three month period, typically resulting in a three to five year life span, providing a lower cost of ownership for your gas detection system. The sensors are robust electrochemical type that feature higher sensitivity and selectivity. Fast sensor response time and excellent stability make these sensors the most reliable and longest-life electrochemical sensors available today.

At the heart of any gas detector is the sensor. With over 65 years of sensor technology experience, RKI has the knowledge and capability to provide the most advanced detection techniques and manufacture the most stable and long lasting sensors in the world. As a result the GD-K8A is one of the most stable and long lasting toxic transmitters on the market.


  • Diffusion style head
  • Low profile design
  • Quick response sensors
  • Many toxic sensors to choose from
  • 3 to 5 year typical sensor life
  • Easy maintenance
  • Selective for target gas
  • Low cost of ownership


  • Semiconductor manufacturing
  • Petrochemical plants
  • Refineries
  • Water & wastewater treatment plants
  • Pulp & paper mills
  • Gas, telephone, & electric utilities
  • Steel
  • Automotive
  • Refrigeration
  • Food Storage
  • Power Plants
  • General Leak Detection


Detection Method Electrochemical cell
Sampling Method Diffusion sampling type
Response Time Within 1 minute when exposed to gas concentration of 3 times the set alarm value
Enclosure Wall mounted, non-explosion proof
Operating Conditions 0 ~ 40 C, 30 ~ 90% RH
Power 100 VAC, 117 VAC, 24 VDC
Weight 1.1 kg
Warranty One year materials and workmanship

Partial List Of Detectable Gases
Many other gases or ranges available.
Contact RKI for gases or ranges not listed.

Ammonia (NH3)
0 - 75.0 ppm
Arsine (AsH3 ) 0 - 0.20 ppm
Boron Trichloride (BCl3) 0 - 15.0 ppm
Carbon Monoxide (CO) 0 - 300 ppm
Chlorine (Cl2) 0 - 3.0 ppm
Chlorine Dioxide (ClO2) 0 - 1.00 ppm
Chlorine Trifluoride (ClF3) 0 - 1.00 ppm
Diborane (B2H6) 0 - 0.3 ppm
Fluorine (F2) 0 - 6.0 ppm
Hydrogen Chloride (HCl) 0 - 15.0 ppm
Hydrogen Fluoride (HF) 0 - 9.0 ppm
Hydrogen Sulfide (H2S) 0 -100.0 ppm
Nitric Oxide (NO) 0 -100.0 ppm
Nitrogen Dioxide (NO2) 0 - 15.0 ppm
Ozone (O3) 0 - 1.0 ppm
Phosphine (PH3) 0 - 1.0 ppm
Silane (SiH4) 0 - 15.0 ppm
Sulfur Dioxide (SO2) 0 - 30.0 ppm

* Specifications subject to change without notice.