Detcon TP-700 - Manual (Page 6)

Model TP-700
TP-700 Instruction Manual Rev. 3.5 Page 2 of 38
thus allowing non-intrusive operator interface with the ITM. Calibration can be accomplished without
declassifying the area. Electrical classifications are Class I, Division 1, Groups B, C, D and Class I, Zone 1,
Group IIB+H
2
.
Figure 1 ITM Circuit Functional Block Diagram
Program Switch #1
LED Display
Program Switch #2
MODEL
TP-700
detcon inc.
H 2 S Sensor
Splash Guard Adapter
Locking Set-Screw
Figure 2 Sensor Assembly Front View
1.3 Modular Mechanical Design
The Model TP-700 Sensor Assembly is completely modular and is made up of four parts (See Figure 3 for
Assembly Break-away):
1) TP-700 Intelligent Sensor Module (ITM)
2) Field Replaceable Plug-in H
2
S Gas Sensor
3) Model 700 Housing Bottom Assembly (contains the Housing Bottom, Flame Arrestor, Retaining Ring,
and rubber O-Ring’s)
4) Splash Guard.
NOTE: All metal components are constructed from electro polished 316 Stainless Steel in order to maximize
corrosion resistance in harsh environments.
I/O
Circuit
Protection
RS-485
4-20mA
Display
Micro-
Processor
Temperature
Control
Pre-Amp
Analog 4-20mA Out
Modbus™ RS-485 Output
Power In
Power Supply
Plug-In
Sensor
Element