LonWorks Versions

LonWorks is a networking platform used by the GD-70D to communicate readings and alarms between a PLC and the transmitter.

GD-70D Category LonWorks

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.

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
ESU Gas DetectedDetection RangeAlarm 1Alarm 2IncrementsPart #
NH3 (Ammonia)0 - 75.0 ppm25.0 ppm50.0 ppm0.5 ppmGD-70D-NH3
AsH3 (Arsine)0 - 0.20 ppm0.05 ppm0.10 ppm0.001 ppmGD-70D4A-ASH3
BCl3 (Boron trichloride)0 - 15.0 ppm5.00 ppm10.0 ppm0.1 ppmGD-70D-BCl3
Br2 (Bromine)0 - 1.00 ppm0.30 ppm0.60 ppm0.01 ppmGD-70D-BR2
CO (Carbon monoxide)0 - 75.0 ppm 25.0 ppm50.0 ppm0.5 ppmGD-70D-CO-02
0 - 75.0 ppm25.0 ppm50.0 ppm0.5 ppmGD-70D-CO-12
0 - 150 ppm50.0 ppm100 ppm1 ppmGD-70D-CO-01
0 - 150 ppm50.0 ppm100 ppm1 ppmGD-70D-CO-11
0 - 300 ppm100 ppm200 ppm2 ppmGD-70D-CO-03
0 - 300 ppm100 ppm200 ppm2 ppmGD-70D-CO-13
Cl2 (Chlorine)0 - 3.00 ppm1.00 ppm2.00 ppm0.02 ppmGD-70D-Cl2
ClF3 (Chlorine trifluoride)0 - 0.60 ppm0.20 ppm0.40 ppm0.005 ppmGD-70D-ClF3-A
B2H6 (Diborane)0 - 0.30 ppm0.10 ppm0.20 ppm0.002 ppmGD-70D-B2H6
H2Cl2Si (Dichlorosilane)0 - 15.0 ppm5.00 ppm10.0 ppm0.1 ppmGD-70D-DCS
Si2H6 (Disilane)0 - 15.0 ppm5.0 ppm10.0 ppm0.1 ppmGD-70D-Si2H6
DMA (Dimethylamine)0 - 15.0 ppm5.0 ppm10.0 ppm0.1 ppmGD-70D-DMA
DEA (Diethylamine)0 - 15.0 ppm5.0 ppm10.0 ppm0.1 ppmGD-70D-DEA
F2 (Fluorine)0 - 3.00 ppm1.00 ppm2.00 ppm0.02 ppmGD-70D-F2
GeH4 (Germane)0 - 0.80 ppm0.20 ppm0.40 ppm0.005 ppmGD-70D-GeH4
HBR (Hydrogen bromide)0 - 6.00 ppm2.00 ppm4.00 ppm0.05 ppmGD-70D-HBR-06
0 - 9.00 ppm3.00 ppm6.00 ppm0.05 ppmGD-70D-HBR-09
HCl (Hydrogen chloride)0 - 6.00 ppm2.00 ppm4.00 ppm0.05 ppmGD-70D-HCL-06E
0 - 15.0 ppm5.0 ppm10.0 ppm0.1 ppmGD-70D-HCL-15E
HCN (Hydrogen cyanide)0.9 - 15.0 ppm4.0 ppm10.0 ppm0.1 ppmGD-70D-HCN
HF (Hydrogen fluoride)0.4 - 3.00 ppm1.00 ppm2.00 ppm0.02 ppmGD-70D-HF-03
0.4 - 9.00 ppm3.00 ppm6.00 ppm0.05 ppmGD-70D-HF-09
H2O2 (Hydrogen peroxide)0 - 3.00 ppm1.00 ppm2.00 ppm0.02 ppmGD-70D-H2O2
H2Se (Hydrogen selenide)0 - 0.20 ppm0.05 ppm0.10 ppm0.001 ppmGD-70D-H2Se
H2S (Hydrogen sulfide)0 - 1.00 ppm0.30 ppm0.60 ppm0.01 ppmGD-70D-H2S-01
0 - 30.0 ppm10.0 ppm20.0 ppm0.2 ppmGD-70D-H2S-30
CH3NH2 (Methylamine)0 - 15.0 ppm5.00 ppm10.0 ppm0.1 ppmGD-70D-CH3NH2
NO (Nitric oxide)0 - 100 ppm5 ppm10 ppm1 ppmGD-70D-NO
NO2 (Nitrogen dioxide)0 - 9.00 ppm3.00 ppm6.00 ppm0.05 ppmGD-70D-NO2-09
0 - 15.0 ppm5.0 ppm10.0 ppm0.1 ppmGD-70D-NO2-15
NF3 (Nitrogen trifluoride)0 - 30.0 ppm10.0 ppm20.0 ppm0.2 ppmGD-70DP-NF3
O3 (Ozone)0 - 0.60 ppm0.20 ppm0.40 ppm0.005 ppmGD-70D-O3
PH3 (Phosphine)0 - 1.00 ppm0.30 ppm0.60 ppm0.01 ppmGD-70D-PH3-AH
0 - 1.00 ppm0.30 ppm0.60 ppm0.01 ppmGD-70D-PH3-DH
SiH4 (Silane)0 - 15.0 ppm5.0 ppm10.0 ppm0.1 ppmGD-70D-SiH4-AH
0 - 15.0 ppm5.0 ppm10.0 ppm0.1 ppmGD-70D-SiH4-DH
SiCl4 (Silicon tetrachloride)0 - 15.0 ppm5.0 ppm10.0 ppm0.1 ppmGD-70D-SiCl4
SO2 (Sulfur dioxide)0 - 6.00 ppm2.00 ppm4.00 ppm0.05 ppmGD-70D-SO2
TEOS (Tetraethyl
0 - 15.0 ppm10.0 ppm10.0 ppm0.1 ppmGD-70DP-TEOS
TMA (Trimethylamine)0 - 15.0 ppm5.0 ppm10.0 ppm0.1 ppmGD-70D-TMA
SGU Gas DetectedDetection RangeAlarm 1Alarm 2IncrementsPart #
COS (Carbonyl sulfide)0 - 2,000 ppm500 ppm1,000 ppm10 ppmGD-70D-MCOS
C2H2Cl2 (Dichloroethylene)0 - 600 ppm200 ppm400 ppm5 ppmGD-70D-MDCE
CH2Cl2 (Dichloromethane)0 - 2,000 ppm500 ppm1,000 ppm10 ppmGD-70D-MDCM
R32 (Difluoromethane)0 - 2,000 ppm500 ppm1,000 ppm10 ppmGD-70D-MR32
R41 (Fluoromethane)0 - 2,000 ppm500 ppm1,000 ppm10 ppmGD-70D-MR41
H2 (Hydrogen)0 - 500 ppm200 ppm400 ppm5 ppmGD-70D-MH2-S500
0 - 1,000 ppm250 ppm500 ppm10 ppmGD-70D-MH2-S1K
0 - 2,000 ppm500 ppm1,000 ppm10 ppmGD-70D-MH2-S2K
0 -2.00% volume (SGU Type)0.50% vol1.00% vol0.01% vol
IPA (Isopropyl alcohol)0 - 2,000 ppm500 ppm1,000 ppm10 ppmGD-70D-MIPA-2K
Methane0 - 2,000 ppm500 ppm1,000 ppm10 ppmGD-70D-MCH4-2K
0 - 5,000 ppm2,000 ppm4,000 ppm25 ppmGD-70D-MCH4-5K
0 - 2% volume (SGU Type)0.50% vol1.00% vol0.01% volGD-70D-MCH4-20K
CH3OH (Methanol)0 - 1,000 ppm250 ppm500 ppm10 ppmGD-70D-MCH3OH-1
0 - 2,000 ppm500 ppm1,000 ppm10 ppmGD-70D-MCH3OH-2
C3H8 (Propane)0 - 2,000 ppm500 ppm1,000 ppm10 ppmGD-70D-MC3H8-2K
0 - 5,000 ppm2,000 ppm4,000 ppm10 ppmGD-70D-MC3H8-5K
NCU Gas DetectedDetection RangeAlarm 1Alarm 2IncrementsPart #
H2 (Hydrogen)0 - 100% LEL10% LEL50% LEL1% LEL
H2 (Hydrogen)0 - 2.00% volume (NCU Type)1.00% vol1.00% vol0.01% volGD-70D-H2-20K
C4H10 (Isobutane)0 - 100% LEL 25% LEL25% LEL1% LELGD-70D-LEL-ISOB
CH4 (Methane)0 - 100% LEL25% LEL25% LEL1% LELGD-70D-LEL-CH4
CH4 (Methane)0 - 2% volume (NCU Type)1.00% vol1.00% vol0.01% volumeGD-70D-CH4-20K
SSU Gas DetectedDetection RangeAlarm 1Alarm 2IncrementsPart #
TMS (Tetramethyl silane)0 - 15.0 ppm10.0 ppm10.0 ppm0.1 ppmGD-70DPLN-TMS
TRIMS (Trimethyl silane)0 - 15.0 ppm10.0 ppm10.0 ppm0.1 ppmGD-70DPLN-3MS
TEOS (Tetraethyl
0 - 15.0 ppm10.0 ppm10.0 ppm0.1 ppmGD-70DP-TEOS
Main Unit Specifications

Communication4-20mA DCDC power line communicationPoE method
Detection principleDifferent type depending upon sensor unit and detectable gas (see table)
Sampling methodSample draw (auto-adjustment of flow rate) 0.5 L / min +/-10%
Display• Large LCD display (white backlight)
• Gas concentration
• Flow rate, communication status, pyrolyzer status, gas detected
• Error code, content of error
Gas alarmsTwo alarm levels:1st alarm Red
2nd alarmRed
Fault alarmYellow
External output1st, 2nd, and trouble alarms:Relay contact output for each alarm
Alarm ActivationAuto-reset or self-latching (fault alarm is auto-reset only)
Self diagnostic functionSystem failure, sensor failure, flow failure, communication error NT / ET / Analog
DataloggingEvent history, alarm history, calibration history. Alarm trend (180 sec before / after 1st alarm)
Alarm Contact SpecificationsNo-voltage contact, 2 step independent, normally open (factory setting) or normally closed
Normally de-energized (energized during alarm, factory setting) or normally energized (de-energized during alarm)
Capacity:125 VAC 0.25A or 24 VDC 0.5A (resistive load)
Recommended Contact CableCable of CVV, etc. (1.25sq) - max. 6-core
Recommended Tubing4 mm x 6 mm Teflon
Max Tubing Lengths30 meters
Operation temp. & humidity0 ~ 40ºC, 30 ~ 70% RH (non-condensing)
Operating settingsAll operational settings are user adjustable through front panel
Power requirementsDC 24V+/- 10%, approx 1.5W (Max 4W including sensor unit)PoE standard arrangement
Note: Approx. 2.5W (Max 5W) with SGU sensor unit
DimensionsWidth2.8 in.70 mm
Height4.7 in.120 mm
Depth5.9 in.150 mm
WeightApprox. 0.9kg (2.0lbs), including sensor unit
MountingWall-mounting base plate by 2 or 3 screws
Sampling tubing4 x 6mm PTFE tubing recommended. Tube fittings provided as standard accessories
BushingCable type varies depending on communication method (Cable bushing optional)
Flow Rate0.5L/min ±10%
Outer ColorGas detector:Grey
Front door:White

Sensor Unit Specifications

Detection principleElectrochemical typePyrolysis-particle typeNew ceramic (Catalytic combustion)SemiconductorGalvanic cell type
Gas to be detectedRefer to list of
detectable gases
NF3/COS0-15ppm TEOS in air and othersCombustible gasCombustible gasOxygen
Toxic gas
Detection rangeSee Detection Gas chart
Detection methodPump suction typePump suction type/pyrolysis typePump suction type
Alarm setpoint valueSee Detection Gas chart
Alarm accuracyWithin ±30% to the alarm setpoint value±25% to the alarm setpoint valueCombustible: ±25% to the alarm setpoint value±1 vol% (Accuracy of the reading: ±0.7 vol%)
Toxic: ±30% to the alarm setpoint value
Alarm delay time60 seconds or less by providing the gas 1.6 times the alarm setpoint (excluding delay in the tube and in the communication)30 seconds or less by providing the gas 1.6 times the alarm setpoint (excluding delay in the tube and in the communication)Combustible: 30 seconds or less by providing the gas 1.6 times the alarm setpoint (excluding delay in the tube and in the communication)5 seconds or less by letting the detector detect the gas of 10 - 11 vol% (excluding delay in the tube and in the communication).
Toxic: 60 seconds or less by providing the gas 1.6 times the alarm setpoint (excluding delay in the tube and in the communication)(90% response: within 30 seconds)
Alarm typeTwo-step alarm (H-HH)Two-step alarm
(L-LL, L-H)
Power consumption Approx. 1.5 W (Max. 4 W)Approx. 3W (Max. 5.5W)Approx. 2.5W (Max. 5W)Approx. 1.5 W (Max. 4 W)
consumption (EA)
24 V: Approx. 3W (Max. approx. 5W)24 V: Approx. 4.5W (Max. approx. 6.5W)24 V: Approx. 4W (Max. approx. 6W)24 V: Approx. 3W (Max. approx. 5W)
PoE: Approx. 4.5W (Max. approx. 7W)PoE: Approx. 5.5W (Max. approx. 8.5W)PoE: Approx. 5.5W (Max. approx. 7W)PoE: Approx. 4.5W (Max. approx. 7W)
consumption (DV)
Approx. 2 W (Max. 4.5 W)Approx. 3.5W (Max. 6W)Approx. 3W (Max. 5.5W)Approx. 2 W (Max. 4.5 W)
Operating temperature (at a constant condition)0 - 40ºC0 - 40ºC0 - 40ºC0 - 40ºC0 - 40ºC0 - 40ºC
Operating humidities (Non-condensing)30 - 70%RH30 - 80%RH95%RH or less
Self diagnosis functionSensor trouble, system failure
Date logging functionEvent history, alarm history, calibration history, Alarm trend (60 sec. before/after 1st alarm)

Pyrolyzer Unit Specifications

ApplicationNF3 / TEOS gases detected in air
UsageUsed by connecting to “GD-70D” (Main unit)
Power LampLED (Green color)
Warming-up:Flashing at every 1 sec interval
Trouble:Flashing at every 0.2 sec interval
Self-diagnostic functionPyrolyzer unit trouble
Fan trouble
System trouble
Operating temp. & humidity0-40° C, 30-70% RH (non-condensing)
Operational settingsAll operational settings are user adjustable through front panel
Power requirementsDC 24V+/- 10%, approx. 25W (max)
DimensionsWidth2.8 in. (70 mm)
Height4.7 in. (120 mm)
Depth5.9 in. (150 mm)
WeightApprox. 1.2kg (2.6lbs)
MountingWall-mounting base plate by 2 or 3 screws
Sampling4x6mm PTFE tubing recommended. Tube fittings provided as standard accessories
Bushing1.25sq 2 core cable for power supply DC24V (Cable bushing optional)