Detcon FP-100 - Manual (Page 7)

Model FP-100
FP-100 Instruction Manual Rev. 0.0 Page 3 of 30
O-Ring
100 Series Bottom
Housing Assembly
Plug-in
Replaceable
Sensor
Interconnect
Wires
Housing Bottom
Locking Screw
Intelligent Transmitter Module (ITM)
Micro-processor controlled circuit
encapsulated in an Explosion proof
housing.
Magnetic
Programming
Switches
Splash Guard
D E TC
O
N , IN
C
.
LEL 100 %
FP-100
3
4
" NPT Locking Nut
Figure 5 Sensor Assembly Breakaway
NOTE: All metal components are constructed from electro polished 316 Stainless Steel in
order to maximize corrosion resistance in harsh environments.
FP-100 Intelligent Transmitter Module
The Transmitter Module is a microprocessor-based package that can be attached to an explosion proof junction
box. Circuit functions include bridge drive circuitry, on-board power supply, microprocessor, magnetic
programming switches, and a linear 4-20mA DC output. Magnetic program switches located on either side of
the ITM are activated via a hand-held magnetic programming tool, allowing non-intrusive operator interface
with the Transmitter Module. Electrical classifications are Class I, Division 1, Groups A, B, C, and D.
Figure 6 Functional Block Diagram
Field Replaceable Plug-in Sensor
The Detcon family of catalytic bead gas sensors are field proven, plug-in sensors with over-sized gold-plated
connections that eliminate corrosion problems. The sensor can be accessed and replaced in the field easily by
releasing the locking screw and unthreading the Bottom Housing. Detcon’s family of catalytic bead sensors
have a long shelf life and are supported by an industry-leading warranty.
Figure 7 Plug-in Sensor
I/O
Circuit
Protection
RS-485 Port
Analog 4-20mA Out
Power In
RS-485
4-20mA
Power
Micro-
Processor
Bridge drive
circuit
Plug-In
Sensor