GD-70D Series Standalone Gas Monitors provided - RKI Instruments

GD-70D Sample Draw Gas Sensor – Transmitter

GD-70D transmitter

Sample Draw Gas Detector


  • 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
Contact Sales


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.

Related Services

Fixed Systems Turnkey Solutions

  • Design, Consultations, and Engineering
  • Installation
  • Start-up
  • Training
  • System Maintenance



Toxic Gases Detection Range AGIH/TLV-TWA Part Number
Ammonia NH3 75 ppm 25 ppm GD-70DEA-NH3
Arsine AsH3 0.2 ppm 5 ppb GD-70DEA-ASH3
Boron Trichloride BCl3 15 ppm (C) 0.7 ppm GD-70DEA-HCL (*)
Boron Trifluoride BF3 9 ppm 0.1 ppm GD-70DEA-HF (*)
Bromine BR2 1 ppm 0.1 ppm GD-70DEA-BR2
Carbon Monoxide CO 75 ppm (ESU-23) 25 ppm GD-70DEA-CO-02
Carbon Monoxide CO 75 ppm (ESU-231) 25 ppm GD-70DEA-CO-12
Carbon Monoxide CO 75 ppm (ESU-23) 25 ppm GD-70DEA-CO-01
Carbon Monoxide CO 75 ppm (ESU-231) 25 ppm GD-70DEA-CO-11
Carbon Monoxide CO 75 ppm (ESU-23) 25 ppm GD-70DEA-CO-03
Carbon Monoxide CO 75 ppm (ESU-231) 25 ppm GD-70DEA-CO-13
Chlorine Cl2 3 ppm

1.5 ppm ⁕

0.5 ppm GD-70DEA-Cl2
Chlorine Trifluoride ClF3 0.6 ppm (C) 0.1 ppm GD-70DEA-ClF3-A
Diborane B2H6 0.3 ppm 0.1 ppm GD-70DEA-B2H6
Dichlorosilane DCS 15 ppm GD-70DEA-DCS
Diethylamine (CH3CH2)2NH 15 ppm 5 ppm GD-70DEA-DEA
Dimethylamine (CH3)2NH 15 ppm 5 ppm GD-70DEA-DMA
Disilane Si2H6 15 ppm (C) 2 ppm GD-70DEA-Si2H6
Fluorine F2 3 ppm 1 ppm GD-70DEA-F2
Germane GeH4 0.8 ppm (C) 2 ppm GD-70DEA-GeH4
Hydrogen Bromide HBr 6 ppm,
9 ppm ⁕
(C) 2 ppm GD-70DEA-HBR-06/-09
Hydrogen Chloride HCI 6 ppm,
15 ppm ⁕
(C) 2 ppm GD-70DEA-HCL-06E/15E
Hydrogen Cyanide HCN 15 ppm GD-70DEA-HCN
Hydrogen Fluoride HF 9 ppm 0.5 ppm GD-70DEA-HF-09
Hydrogen Peroxide H2O2 3 ppm 1 ppm GD-70DEA-H2O2
Hydrogen Selenide H2Se 0.2 ppm 0.05 ppm GD-70DEA-H2Se
Hydrogen Sulfide H2S 1 ppm

30 ppm


1 ppm GD-70DEA-H2S-01/-30
Nitric Oxide NO 100 ppm 25 ppm GD-70DEA-NO
Nitrogen Dioxide NO2 9 ppm

15 ppm

3 ppm GD-70DEA-NO2-09/-15
Nitrogen Tetraoxide N2O4 15 ppm GD-70DEA-N2O4
Ozone O3 0.6 ppm 0.1 ppm GD-70DEA-O3
Phosphine PH3 1 ppm (ESU-23AH) 0.3 ppm GD-70DEA-PH3-AH
Phosphine PH3 1 ppm (ESU-23DH) 0.3 ppm GD-70DEA-PH3-DH
Silane SiH4 15 ppm (ESU-23AH) 5 ppm GD-70DEA-SiH4


Silane SiH4 15 ppm (ESU-23DH) 5 ppm GD-70DEA-SiH4


Silicon Tetrachloride SlCl4 15 ppm GD-70DEA-SiCl4
Silicon Tetrafluoride SiF4 9 ppm GD-70DEA-SiF4
Sulfur Dioxide SO2 6 ppm GD-70DEA-SO2
Sulfur Tetrafluoride SF4 9 ppm GD-70DEA-SF4
Tetraethyl Orthosilicate TEOS 15 ppm GD-70DEA-TEOS
Ttrichlorosilane TCS 15 ppm GD-70DEA-TCS
Trimethylamine (CH3)3N 15 ppm 5 ppm GD-70DEA-TMA
Tungsten Hexafluoride WF6 9 ppm GD-70DEA-WF6
MOS Gases Detection Range ACGIH/TLV-TWA Part Number
Dichlorethylene DCE 600 ppm GD-70DEA-MDCE
Dichloromethane DME 2,000 ppm 50 ppm GD-70DEA-MDCM
Hydrogen H2 500 ppm GD-70DEA-MH2-S500
Hydrogen H2 1,000 ppm GD-70DEA-MH2-S1K
Hydrogen H2 2,000 ppm GD-70DEA-MH2-S2K
Hydrogen H2 2% Vol. GD-70DEA-MH2-20K
Isopropyl Alcohol CH3CHOHCH3 2,000 ppm 200 ppm GD-70DEA-MIPA-2K
Methane CH4 2,000 ppm GD-70DEA-MCH4-2K
Methane CH4 5,000 ppm GD-70DEA-MCH4-5K
Methane CH4 2% Vol. GD-70DEA-MCH4-20K
Methanol CH3 1,000 ppm GD-70DEA-MCH3OH-1
Methanol CH3 2,000 ppm GD-70DEA-MCH3OH-2


Propane CH3H8 2,000 ppm 1,000 ppm GD-70DEA-MC3H8-2K
Propane CH3H8 5,000 ppm 1,000 ppm GD-70DEA-MC3H8-5K
Difluoromethane R-32 2,000 ppm 1,000 ppm GD-70DEA-MR32
Fluoro Methane R-41 2,000 ppm 1,000 ppm GD-70DEA-MR41
Catalytic LEL & O2 Detection Range LEL % Vol. Levels
Hydrogen H2 100% LEL GD-70DEA-LEL-H2
Hydrogen H2 2% Vol. GD-70DEA-H2-20K
Isobutane i-C4H10 100% LEL GD-70DEA-ISOB
Methane CH4 100% LEL GD-70DEA-LEL-CH4
Methane CH4 2% Vol. GD-70DEA-CH4-20K
Oxygen O2 25% Vol. GD-70DEA-OXY-EC



Model GD-70D GD-70D-NT GD-70D-ET
Communication 4-20mA DC DC power line communication PoE Method
Detection principle Different type depending upon sensor unit and detectable gas (see table)
Sampling method Sample drawing types (auto-adjustment of flow rate) 0.5 / min +/-10%
  • Large LCD display (white backlight)
  • Gas concentration
  • Flow rate, communication status, Pyrolyzer status, gas detected
  • Error code, content of error
Gas alarms Two alarm levels: 1st alarm – Red 2nd alarm – Red Fault alarm: Yellow
External output 1st, 2nd, and trouble alarms : Relay contact output for each alarm
Self diagnostic function System failure, sensor failure, flow failure, communication error NT / ET / Analog
Datalogging Event history, alarm history, calibration history. Alarm trend (180 sec before / after 1st alarm)
Operation temp. & humidity 0 ~ 40ºC, 30 ~ 70% RH (non-condensing)
Operating settings All operational settings are user adjustable through front panel
Power requirements DC 24V+/- 10%, approx 1.5W (Max 4W including sensor unit) Note: Approx. 2.5W (Max 5W) with SGU sensor unit PoE standard arrangement
Dimensions 2.8”W x 4.7”H x 5.9”D (70W x 120H x 150Dmm)
Weight Approx. 0.9kg (2.0lbs), including sensor unit
Mounting Wall-mounting base plate by 2 or 3 screws
Sampling tubing 4 x 6mm PTFE tubing recommended. Tube fittings provided as standard accessories
Bushing Cable type varies depending on communication method (Cable bushing optional)


Detection Principle Electro-chemical cell Semi-conductor Pyrolysis-particle Catalytic combustion
Gas detected and detection range Refer to list of detectable gases 0-2000ppm H2, CH4, or CH2F2 (R-32) in air and others 0-15ppm TEOS in air 0-100% LEL H2, CH4, and others
Self diagnosis function Sensor trouble, system failure
Date logging function Event history, alarm history, calibration history, Alarm trend (60 sec. before/after 1st alarm)


Model PLU-70
Application NF3 / TEOS gases detected in air
Usage Used by connecting to “GD-70D” (Main unit)
Power Lamp
  • LED (Green color)
  • Normal: Light-on
  • Warming-up: Flashing at every 1 sec interval
  • Trouble: Flashing at every 0.2 sec interval
Self-diagnostic function
  • Pyrolyser unit trouble
  • Fan trouble
  • System trouble
Operating temp. & humidity 0-40° C, 30-70% RH (non-condensing)
Operational settings All operational settings are user adjustable through front panel.
Power requirements DC 24V+/- 10%, approx. 25W (max)
Dimensions 2.8”W x 4.7”H x 5.9”D (70W x 120H x 150Dmm)
Weight Approx. 1.2kg (2.6lbs)
Mounting Wall-mounting base plate by 2 or 3 screws
Sampling 4x6mm PTFE tubing recommended. Tube fittings provided as standard accessories
Bushing 1.25sq 2 core cable for power supply DC24V (Cable bushing optional)
Contact Image

Contact Us

Best Selling

You Might Also Like

© 2024 RKI Instruments. All Rights Reserved | Gas Detectors | Portable Gas Monitors | Gas Sensors