RKI Instruments 30-0951RK LEL - Manual (Page 5)

30-0951RK LEL Sample Draw Aspirator Adapter • 5
compressed air and the air drawn from the sensor chamber into the top port of the
aspirator both exhaust at the right side of the aspirator.
Sensor Adapter
The sensor adapter screws directly onto the LEL sensor. It is installed hand tight. It has a
gasket inside it which seals against the sensor. When removing this adapter to change the
sensor, be sure not to lose this gasket.
Sensor Chamber
The chamber has three thumbscrews which fasten it to the sensor adapter. An o ring at the
top of the chamber seals the chamber/adapter interface. The inlet of the chamber is on the
right 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. It has a 1/4” tube fitting at its inlet port
and its exhaust port is connected to the sensor chamber. The flowmeter’s indication range
is 1 - 10 SCFH. It has no flow adjustment valve because the flowrate is controlled by the
regulator.
Installation
Figure 2: Outline & Mounting Dimensions
1. Install and startup the combustible detector as described in the combustible detector’s
instruction manual.
1.25
Aspirator/Sample
Exhaust
(1/8 NPT female)
Screw Onto Combustible Sensor
1/4 O.D. Tube Sample
Inlet Fitting
4.00 max
- +
1/4 O.D. Tube Compressed Air Inlet
Fitting
9.50 max
8.20 max