6.3
95-8714
32
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
T h e L S 2 0 0 0 d e t e c t o r c o n t a i n s
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 28.
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 29.
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
30 for the transmitter and Figure 31 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 flameproof properties of the LS2000.
If replacement flange 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 certification of the
LS2000.
FLANGE BOLT (7)
A2661
Figure 28—LS2000 Transmitter
RETAINER RING
A2662
LOCKING SET SCREW
Figure 29—LS2000 Receiver