RKI Instruments 65-2481RK - Manual (Page 8)

4 • 65-2481RK Multi Point Detector
61-0190RK IR LEL Detector
Figure 2: 61-0190RK IR LEL Detector Component Location
The infrared LEL detector is made up of a miniature infrared combustible gas LEL
detector housed and encapsulated in a pipe nipple. The pipe nipple has 3/4” NPT threads
on each end and a 1 1/4” hex that allows removal or installation of the detector with a
wrench. A porous flame arrestor that is coated with a hydrophobic film that repels liquids
is on one end of the detector and allows sample gas to enter the detector. The flame
arrestor also contains any sparks which may occur within the detector. Four color coded
leads, red, white, green, and black, extend from the other end of the detector. The leads
allow you to connect the detector to the terminal block. To distinguish the propane
detector from the methane detector (in case the replacement sensor label that is applied to
one of the leads is lost), a short length of red shrink tubing is applied to the white wire of
the propane detector near where the wire comes out of the nipple.
IR LEL Detector