The new Model GD-70D smart gas detection transmitter series sets a new standard for performance, flexibility, and versatility. The GD-70D sample-draw transmitter offers an array of sensor technologies unmatched in the industry, including unique offerings, such as our hydrogen-specific or LEL versions.

The long life high capacity pump and wide variety of sensing elements are replaceable in a few seconds, with no tools required! The smart sensors retain all calibration and sensor-specific data in non-volatile memory, so sensors can be hot-swapped in the field with no programming required. The sensors also retain calibration information, which means they can be conveniently calibrated separate from the transmitter, avoiding transport of calibration gases to the field location. The GD-70D firmware automatically corrects for long-term zero and span “drift” minimizing maintenance and maximizing reliability.

Vaporized hydrogen peroxide gas detection (VHP) in fumigation disinfection of medical facilities, pharmaceutical environments, including cleanrooms, production filling lines, and chemical fogging for the food industry.

The GD-70D can be used as a stand-alone device, offering a number of communication protocols to existing PLC systems, or can be integrated with RKI’s Beacon series of single and multi-channel controllers.

All GD-70D transmitters include a large, easy to read integral LCD display, tri-color bar graph for visual notification of alarm status, programmable low and high alarm relays, and fault relay. Pump flow is self-tuning for maintenance-free operation. Because all GD-70D base units are identical, sensors can be interchanged with no programming or tools required, resulting in maximum flexibility to the user.


Monitor combustibles, O2, and a wide range of toxics
Monitor vaporized hydrogen peroxide (VHP) fumigation and disinfection
Plug and play smart sensors retain calibration and sensor data
Common platform (Main unit / Sensor / Pump) for all detection methods
Universal main unit (all sensor types)
Multifunctional sensor unit (New Intelligent sensor)
No internal tubing (main unit) / No coil (pump)
Front access, no tool required, easy sensor and pump replacement
Large size LCD screen
Various communication methods available (4-20mA, NT and PoE)
Minimal maintenance cost through enhanced troubleshooting firmware functions
Small mounting space
Environmentally friendly
Wide variety of sensors available



General Specifications

Product Specifications
Product Type12 Channel wired gas monitor controller
Operating Voltage12V to 35V DC or 120V AC
Current Draw300 mA maximum (8 channel) 325 mA maximum (12 channel)
ProtectionPower electromagnetic interference (EMI) filter 4-20 mA surge suppression RS-485 and RS-232 surge suppression
Display Screen160 x 104 Resolution graphical LCD screen transflective (sunlight readable) with LED back light
Interface5 Push-buttons (MENU, ADD, SUB, SCAN/HOLD and RESET/ESC)
Product Mounting4 Mounting feet, 6 in. W x 12-1/4 in. T (included) maximum mounting bolt/screw size of 5/16 in. (8mm) diameter
Temperature Range-40°C to +70°C
Product CompatabilityM2A, S2, GD-70D, T2A T3A, VOC Pro transmitters
Wired (Analog) Input12 analog inputs, 4-20mA
Relays• 4 Dry-contact relays with 4 amp replaceable fuses • Fault terminal • Optional to disable alarm relay • Latching and non-latching relay settings
Enclosure MaterialsNEMA-4X enclosure with clear window
Product Dimensions12 in, L x 10 in. W x 6 in. H (Max. dimensions with attachments)
Total Weight12.15 lbs
Harware Warranty1-Year limited

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