Sample Draw Pump Unit

Connects to a gas detector and draws samples of air into the gas detector from hard to access locations such as 
shafts, tall ceilings, wells, pits, small rooms, etc.

Uses a pump to pull sample air through a length of tube into the gas detector, across the sensor and exhaust it 
from the outlet port

Key Features

• Safely sample air in difficult or hard to access areas
• Simple to use, easy to connect
• 24 VAC or VDC powered
• Sample draw pump and adjustable flow meter
• Compatible with many types of gas detectors
• Standard water / dust tight, corrosion resistant enclosure (drip proof)

The PRU-24 is a self-contained Sample Draw Pump Unit that can be utilized with most gas detectors. It contains a 
pump that is designed to draw samples of air from hard to access locations such as shafts, tall ceilings, wells, pits, 
small rooms and other locations where it is difficult to install gas detectors. The sample draw pump pulls air from 
the sampling area through tubing connected to the inlet port, over the sensor and exhausts it from the outlet port. 
If the gas readings are higher than a specified set point, the gas detector will go into alarm.

The unit can be purchased with 24 VAC or 24 VDC operating power and includes a sample pump, adjustable flow 
meter, in-line particulate filter with a water tight, polycarbonate enclosure.

The tubing and flow adapter that fits CETCI gas detectors are sold separately.

Caution: The Sample Draw Pump Unit should not be used inside classified hazardous areas or to sample draw 
combustible gases or oxygen concentrations above 30% vol because the pump is not intrinsically safe. 

Mechanical

Enclosure				ABS / Polycarbonate, corrosion resistant 
				        Copper coated interior to reduce RF interference

Size				        254 x 218 x 109 mm / 10.0 x 8.6 x 4.3 inches

Weight				1.63 kg / 3.6 lbs

Tubing (sold separately)		1/8" ID x 1/4" OD, clear, 15.24 m / 50 ft roll sold separately (p/n: CET-8000-CMT)

Electrical

Power Requirement		24 VAC, 60 Hz, requires Class 2 transformer
				        24 VDC @ 320 mA

Current Draw			0.32 amps @ 24 VDC
				        0.37 amps @ 24 VAC

Wiring				18 AWG stranded, shielded, follow local/site electrical codes

Environmental

Operating Temperature		-1°C to 40°C (30°F to 105°F)

Operating Humidity		non-condensing

Certifications

Conforms to			        RoHS compliant circuit boards