GD-70D Intelligent Gas Detector
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 PLS 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 relays. 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:
- Monitor combustibles, 02, 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
- LonWorks aersion is available for some types (contact for pricing)
Download Product Datasheet (PDF) click here
GD-70D Intelligent Gas Detector
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) |
GD-70D Intelligent Gas Detector
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 Intelligent Gas Detector
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