Gas Detection Sample Draw System


The Sensidyne Sample Draw System samples air from remote locations pulling a sample to gas detection transmitter(s) and is offered as a diaphragm pumped or an air operated aspirator unit. It is FM approved for placement in a Class I, Division 2 Hazardous (Classified) area to sample from a Class I, Division 1 Hazardous (Classified) area, Groups C and D. A Division 2 approval eliminates the need for flame arrestors and reduces related maintenance caused by dirt and moisture.

Flow rate is easily adjustable and a rotameter is provided for visual indication of flow. A fail-safe flow switch can de-actuate the relay and provide a signal on loss of flow or power. A two-way valve permits the application of calibration standards to the gas sensor(s) for routine preventative maintenance.

The Sample Draw System is housed in a wall-mount fiberglass enclosure and rated NEMA 3R. The system power supply is capable of operating the pump and multiple in-line transmitters, enabling up to four gas sensors placed downstream of the sample for monitoring different gases. This integral power source enhances capabilities for remote applications such as pumping stations, large laboratories, and gas hoods while significantly reducing installation costs.


  • Brand
  • Overview
  • Specifications




Hazardous Area Approved, Gas Detection Sample Draw System
For use with Sensidyne Fixed Gas Detectors
  • Class 1, Division 2 Rated for Sampling from a Class 1 Division 1 Area

  • FM Listed for NFPA 820 Compliance

  • Pumped or Air Aspirated Versions

  • Flow Sensor with Relay that Fails Safe

  • Internal Power Switch and Flow Adjust

  • 24 VDC Power Source for Gas Detectors

  • Fiberglass Wall-mount Enclosure





NEMA 3R Fiberglass wall mount with two 3/4” conduit entries


11” (H) X 10” (W) X 6.375” (D) (27.9cm X 25.4cm X 16.2cm)


6.6 lbs (3.0 kg)


-4° to 104°F (-20° to 40°C)


5-95% RH, non-condensing for indoor or outdoor locations.

Indicators and Controls


Flowmeter, green power LED and red fault/low flow LED


On-Off switch, voltage out adjust and flow rate adjust


Two 24 VDC power terminals, SPDT fault/low flow relay contact

Power In/Out:

85–264 VAC, 47-63 Hz, 1.2 Amps; 24 VDC, 1.1 Amp max.



FM approved for Class 1, Division 2 Groups C & D Rated for Sampling from a Class 1 Division 1 Area Groups C & D

DC Supply:

UL60950-1, UL508, UL1310(3), EN60950-1, CE Mark


Diaphragm type rated at 1.0 lpm @ 40” H2O at pressurized leak rate of < 1.0 inch wc drop in 5 seconds at 25 inches wc

Wetted parts:

Polycarbonate, Neoprene, Tygon 2075, Silicone Silastic, 304/316ss, Buna-N, Brass, PVC, Glass, Acrylic and User Tubing


Do not use for Acid gases such as Cl2, ClO2, HCl, HF, HCN, NH3, NO2, SO2 and others since the PPM gases are absorbed by the tubing, moisture and various wetted parts slowing or completely eliminating response to the target gas. Do not attempt to use below freezing without heat tracing and a means to keep the system above 32⁰ F (0⁰ C). Excessive condensation will occur when sampling from a higher to a lower temperature.

Ordering Information

Pumped Sample Draw with 24 VDC power supply


Aspirated Sample Draw with 24 VDC power supply


Close Nipple 1/8 NPT fitting


Coalescing filter and Close Nipple 1/8 NPT


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