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.

• 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.

  * Specifications subject to change without notice.

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