Detcon PI-700 - Manual (Page 40)

Model PI-700
PI-700 Instruction Manual Rev. 2.5 Page 36 of 54
Visual Inspection
The Sensor should be inspected annually. Inspect for signs of corrosion, pitting, and water damage. During
visual inspection, the Splash Guard should be inspected to insure that it is not blocked. Examine the plug-in
sensor for signs of physical blockage, electrolyte leakage, or severe corrosion.
Also, inspect inside the
Junction Box for signs of water accumulation or Terminal Block corrosion.
Condensation Prevention Packet
A moisture condensation packet should be installed in every explosion proof Junction Box. The moisture
condensation prevention packet will prevent the internal volume of the J-Box from condensing and
accumulating moisture due to day-night humidity changes. This packet provides a critical function and should
be replaced annually. Detcon’s PN is 960-202200-000.
Housing Bottom
Locking Set-Screw
Splash Guard
Intelligent ransmitter Module (ITM)
Microprocessor controlled circuit
encapsulated in an explosion
proof housing
Splashguard
Adapter
Plug-In replaceable
Sensor Cell
Magnetic
Programming
Switches
Lens and LCD
Display
Interconnect Wiring
O-Rings
M
O
D
E
L
P
I-7
0
0
V
O
C
d
e tc
o
n
in
c
.
M
O
D
E
L
P
I-7
0
0
d
e tc
o
n
in
c
.
Figure 30 Sensor Assembly
5.2 Replacement of Intelligent Plug-in Sensor
NOTE: It is not necessary to remove power while changing the Intelligent plug-in VOC gas
sensor in order to maintain area classification, since it is intrinsically safe.
a) Use a 1/16” Allen wrench to release the locking setscrew that locks the ITM and Splash Guard Adapter
together (One turn will suffice - Do not remove setscrew completely).
b) Remove splashguard. Unthread and remove the Splash Guard Adapter from the ITM.
c) Gently pull the plug-in sensor out of the ITM. Remove moisture control packet if supplied. Transfer to new
plug-in sensor. Orient the new plug-in sensor so that it matches with the female connector pins.
When
properly aligned, press the sensor in firmly to make the proper connection.