RKI Instruments 30-0951RK-H2S - Manual (Page 4)

4 • 30-0951RK-H2S Sample Draw Aspirator Adapter
Description
The sample draw aspirator adapter uses compressed air flowing through a venturi to
draw air into a sample chamber. The sample draw adapter screws directly onto the gas
detector.
Figure 1: Component Location
The sample draw adapter consists of four major components (see Figure 1): the regulator,
aspirator, detector adapter, detector chamber, and flowmeter.
Regulator
The regulator has an inlet port on its left side with a 1/4” tube fitting. The maximum
allowable inlet pressure is 300 psi. A gauge at the bottom of the regulator indicates the
output pressure. The output pressure, and detector flow, can be adjusted using the knob
on the front of the regulator. The detector flow rises or falls as the output pressure is
increased or decreased.
Screw Onto Combustible
Sensor
Pressue Gauge
Aspirator
Thumbscrew (3X)
Flowmeter
Pressure Regulator
Sensor Adapter
Sensor Chamber
Adapter Gasket (in
bottom of adapter)
1/4 O.D. Tube
Compressed Air
Inlet Fitting
Pressure Adjustment
Knob
Aspirator/Sample
Exhaust
(1/8 NPT female)
1/4 O.D. Tube Sample
Inlet Fitting
+ -
Chamber O-ring (in top of
chamber)