Det-Tronics LS2000 - Receiver Electronics Module

31 95-87142.2
REplacinG lS2000
tRanSmittER/REcEivER
ElEctRonicS modulE
WARNING
Do not open when an explosive gas
atmosphere may be present.
CAUTION
Only Det-Tronics authorized personnel are
allowed to perform this repair.
CAUTION
Replacement of the LS2000 transmitter or
receiver module requires disassembly of
the device housing. Remove power to the
device before disassembly.
CAUTION
The LS2000 detector contains
semiconductor devices that are sensitive
to electrostatic discharge (ESD). Use
normal precautions for handling ESD
sensitive devices. Handle the device
by the housing, taking care not to touch
electronic components or terminals.
MODULE REPLACEMENT PROCEDURE
Tools Required:
– 6 mm hex wrench (transmitter)
– 5/16 inch hex wrench (receiver)
– Torque wrench capable of accurately
measuring 40 inch-pounds
1. Bypass system alarms as needed, then
remove 24 Vdc power from the LS2000
detector.
2. Transmitter
Remove the seven stainless steel flange bolts
using a 6 mm hex wrench. See Figure 23.
Take care to properly support the module as
the last flange bolt is removed.
Receiver
Using a 5/16 inch hex wrench, loosen the
locking set screw. Turn the retainer ring by
hand to loosen the module. See Figure 24.
3. Carefully remove the old module by extracting
it straight out from the bulkhead.
4.
Ensure that the o-ring is present, undamaged,
and correctly seated in the groove. This o-ring
is required to maintain the watertight integrity of
the LS2000 housing.
5. Line up the pin on the replacement module
with the hole in the bulkhead and insert the
module straight into the bulkhead. See Figure
25 for the transmitter and Figure 26 for the
receiver.
6. Transmitter
Insert and tighten the seven flange bolts
in an opposing consecutive order in two
stages — first partially tighten all seven bolts
equally, and then fully tighten each bolt in
anopposingorderto90in-lbs(10.2N•m)
maximum of torque. Bolts are M8-1.25x 16M.
CAUTION
Flange bolts are critical to maintaining
the ameproof properties of the LS2000.
If replacement ange bolts are needed,
DEC spare part number 012713-001 must
be used in order to maintain the integrity
of the enclosure. The use of any other
bolts will void the Ex d certication of the
LS2000.
Receiver
Fully tighten the retainer ring on the receiver
module, then tighten the set screw to prevent
the ring from being turned.
FLANGE BOLT (7)
A2661
Figure 23—LS2000 Transmitter
RETAINER RING
A2662
LOCKING SET SCREW
Figure 24—LS2000 Receiver