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GD-70D Series

Intelligent Gas Detector

GD-70D Intelligent SensorThe 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.

  • Features
  • Specifications
  • Gases
  • Downloads
  • Callouts

Features

  • GX-2009 manholeMonitor combustibles, O2, and a wide range of toxics
  • 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

 

Tool Free Maintenance
GD-70D sensor
Sensor Replacement

GD-70D pump
Pump Replacement

MAIN UNIT

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%
Display
  • Large LCD display (white backlight)
  • Gas concentration
  • Flow rate, communication status, Pyrolyzer status, gas detectored
  • 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)

 

SENSOR UNIT

Model ESU SGU SSU OSU NCU
Detection Principle Electro-chemical cell Semi-conductor Pyrolysis-particle Galvanic cell 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 0-25% O2 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)

 

PYROLYSER UNIT

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)

ESU Gas Detected

ACGIH TLV-TWA

Detection Range

Ammonia NH3

25 ppm

75 ppm

Arsine AsH3

5 ppb

0.2 ppm

Bromine BR2

0.1 ppm

1 ppm

Carbon Monoxide CO

25 ppm

75 ppm *

150 ppm

300 ppm *

Chlorine Cl2

0.5 ppm

3 ppm

1.5 ppm *

Chlorine Trifluoride ClF3

(C) 0.1 ppm

0.6 ppm

Diborane B2H6

0.1 ppm

0.3 ppm

Disilane Si2H6

(C) 2 ppm

15 ppm

Dimethylamine (CH3)2NH

5 ppm

15 ppm

Diethylamine (CH3CH2)2NH

5 ppm

15 ppm

Fluorine F2

1 ppm

3 ppm

Germane GeH4

(C) 2 ppm

0.8 ppm

Hydrogen Bromide HBr

(C) 2 ppm

6 ppm,
9 ppm *

Hydrogen Chloride HCI

(C) 2 ppm

6 ppm,
15 ppm *

Hydrogen Fluoride HF

0.5 ppm

9 ppm,
3 ppm *

Hydrogen Selenide H2Se

0.05 ppm

0.2 ppm

Methylamine CH3NH2

5 ppm

15 ppm

Nitric Oxide NO

25 ppm

100 ppm

Nitrogen Dioxide NO2

3 ppm

15 ppm

Nitrogen Trifluoride NF3

10 ppm

30 ppm

Ozone O3

0.1 ppm

0.6 ppm

Phosphine PH3

0.3 ppm

1. ppm

Silane SiH4

5 ppm

15 ppm

Sulfur Dioxide SO2

6 ppm

Trimethylamine (CH3)3N

5 ppm

15 ppm

SGU Gas Detected

ACGIH TLV-TWA

Detection Range

Methane CH4

1,000 ppm

2,000 ppm

5,000 ppm *

Dichloroethene C2H2CL2

200 ppm

600 ppm

Isopropyl Alcohol CH3CHOHCH3

200 ppm

2,000 ppm

Propane CH3H8

1,000 ppm

2,000 ppm

5,000 ppm *

Methyl Alcohol CH3OH

200 ppm

1,000 ppm

2,000 ppm *

Hydrogen H2

500 ppm *

1,000 ppm *

2,000 ppm

Difluoromethane R-32

1,000 ppm

2,000 ppm

Fluoro Methane R-41

1,000 ppm

2,000 ppm

Carbonyl Sulfide COS

2,000 ppm

Dichloromethane CH2CL2

50 ppm

2,000 ppm

NCU Gas Detected

LEL % Vol. Levels

Detection Range

Methane CH4

5% Vol.

100% LEL

2.0 Vol.

Isobutane i-C4H10

1.8% Vol.

100% LEL

Hydrogen H2

4% Vol.

2.0 Vol.

SSU Gas Detected

ACGIH TLV-TWA

Detection Range

Trimethyl Silane TMS

15 ppm

Trimethoxysilane TRIMOS

15 ppm

Tetraethyl Orthosilicate TEOS

10 ppm

15 ppm

OSU Gas Detected

ACGIH TLV-TWA

Detection Range

Oxygen O2

25% Vol.

* Special order for non-standard range

GD-70D callout

* Specifications subject to change without notice.