3 • 30-0954RK-200 Series Sample Draw Aspirator Adapter
Regulator
The regulator has an inlet port on its left side with a 1/4” tube fitting. The maximum allowable inlet
pressure is 140 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.
Aspirator
The aspirator inlet is connected to the output port on the right side of the regulator and the vacuum
port on top is connected to the detector chamber. It has a venturi tube inside it which generates a
vacuum at its top port when compressed air flows through it. The compressed air and the air drawn
from the detector chamber into the top port of the aspirator both exhaust at the right side of the
aspirator.
Detector Adapter
The detector adapter screws directly onto the detector. It is installed hand tight. It has a gasket
inside it which seals against the detector. When removing this adapter to change the detector, be
sure not to lose this gasket. Each specific sensor requires its own detector adapter.
Detector Chamber
The chamber has three thumbscrews which fasten it to the detector adapter. An O-ring at the top of
the chamber seals the chamber/adapter interface. The inlet of the chamber is on the side and is
connected to the exhaust of the flowmeter. The exhaust of the chamber is at the bottom and is
connected to the vacuum port of the aspirator.
Flowmeter
The flowmeter indicates the flow to the detector(s). It has a 1/4” OD tube fitting at its inlet and
exhaust port. The exhaust port of the flow meter is connected to the detector chamber or to the first
detector chamber if two detector heads are installed. The flowmeter’s indication range is 1 - 10
SCFH. It has no flow adjustment valve because the flowrate is controlled by the regulator setting.
Calibration Valve
The calibration valve is a manual operation spring return valve with a push button actuator. This
valve is used to switch from sample flow to calibration gas during the calibration process. When
the button is pushed and held, the sample port is closed and the calibration port is opened.
Inlet/Blowback Valve
The inlet/blowback valve is a manual operation spring return valve. A push button actuator is
located on the front of the valve. This valve is used to switch from sample flow to blow back in the
event of a clogged sample line. When the push button is pressed and held, the valve diverts the
compressed air supply back through the sample line to clear obstructions.
WARNING: The blowback pressure can be as high as 140 PSI. Make sure that all personnel
and equipment are clear of the sample line inlet end to avoid personal injury or
equipment damage if a sample line obstruction is blown out of the sample line.
Low Flow/Drain Fault Contact Housing
The low flow switch provides open contacts in normal operation in the low flow/drain fault contact
housing that close in the event of a low flow condition. Two contact wires protrude from the side of
the switch and enter the low flow contact housing through a plastic cable bushing on the left side of
the housing. Terminals are provided in the low flow/drain fault contact housing for field connection
to the switch contacts.
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