GD-K88Ai - Diffusion Sensor

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The GD-K88Ai is a diffusion style toxic gas detection transmitter ideally suited to meet a variety of toxic gas detection needs. You can choose from a wide range of electrochemical toxic gas sensors to install in this model. The GD-K88Ai includes easy to read LCD display and push button controls for calibration. When it is used with optional intrinsic safety barriers the GD-K88Ai is safe for use in hazardous locations. The low profile design is only 1.9 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).

At the heart of any gas detector is the sensor. The sensors for the GD-K88Ai 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. These fast-responding sensors are robust electrochemical type that feature higher sensitivity and selectivity.

With over 75 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-K88Ai is one of the most stable and long lasting toxic transmitters on the market.



  • Diffusion style head
  • Digital readout of gas name and concentration
  • External control buttons for easy maintenance
  • Intrinsically safe design
  • Quick response sensors
  • Many toxic sensors to choose from
  • 3 to 5 year typical sensor life
  • 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
Display7-segment LCD (4 digits) for gas name and concentration
Transmission Method2-wire analog transmission
Transmission SpecificationsAnalog transmission scheme: 4 – 20 mA DC (load resistance: 300 ? or less) Digital transmission scheme: HART Communication (Pending)
Power Supply15 – 27 VDC 
Recommended CableShielded cable of 16 AWG wires with shield
Transmission DistanceUp to 0.5 miles (up to 600 m between the detector head and I.S. Barrier)
Recommended Intrinsic Safety BarrierZener Barrier (MTL728ac/MTL728+/MTL728-) or Insulating Barrier (MTL5541/RN-221N-EJ/KFD2-SCD-EX1.LK)
Operating Temperature0 – 40°C (0 -104 °F)
Operating Humidity30 – 70%RH (Non-condensing) 
Accuracy+ / – 10% of reading or + / -5% of full scale (whichever is greater)
StructureBox type/Wall mounted type 
Protection MethodIntrinsically safe when used with appropriate Zener I.S. barrier
Intrinsic Safety RatingExiaIICT4
Intrinsic Safety certification numberTC20741(TIIS in Japan)
External DimensionsApprox. 3.9 in (W) x 9.5 in (H) x 1.9 in (D) (projection portions excluded)
Weight2 lb. 
Warranty1 year
Partial List Of Detectable Gases
Many other gases or ranges available.
Contact RKI for gases or ranges not listed.
GasRange
Ammonia (NH3)0 – 75.0 ppm
Arsine (AsH3)0 – 0.20 ppm
Carbon Monoxide (CO)0 – 150 ppm
Chlorine (CI2)0 – 3.00 ppm
Diborane (B2H6)0 – 0.30 ppm
Disilane (Si2H6)0 – 15.0 ppm
Germane (GeH4)0 – 0.60 ppm
Hydrogen Bromide (HBr)0 – 9.00 ppm
Hydrogen Cyanide (HCN)0 – 30.0 ppm
Hydrogen Chloride (HCI)0 – 15.0 ppm
Hydrogen Sulfide (H2S)0 – 30.0 ppm (optional 0 – 1.00 ppm)
Nitric Oxide (NO)0 – 100.0 ppm
Nitrogen Dioxide (NO2)0 – 15.0 ppm
Phosphine (PH3)0 – 1.00 ppm
Silane (SiH4)0 – 15.0 ppm
Sulfur Dioxide (SO2)0 – 6.00 ppm


* Specifications subject to change without notice.

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