System Overview | 2-13
Electronics
• One assembly - mounted to a plate
• The electronics/software completely control the sensor.
- No external controllers are required.
• The configuration/monitoring interface to the electronics is RS485
MODBUS RTU.
• Sensor wiring and Customer wiring (e.g., power, I/O) are directly con-
nected to the main electronics.
- Connections are pluggable.
- Both plugs and headers are laser printed for easy matching.
I/O
The WDG-V has the following I/O available:
• Qty (3) configurable 4-20 mA outputs
• Qty (2) system alarm relays (Service and Data Valid)
• Qty (3) configurable process alarm relays
• Qty (1) RS485, 2 wire, MODBUS RTU interface (57.6 Kbaud)
• Qty (1) Contact input (for remote auto calibration trigger)
• Valve controls for Remote Calibration Unit (RCU)
Analog Outputs
There are 3 analog outputs in the WDG-V. Each analog output can be con-
figured for Mode, Function, and Span, Zero.
Mode options include: 0-20ma, 4-20ma and NAMUR.
Functions include: Oxygen, cell millivolts, combustibles*, methane*
The analog outputs can be powered internally or externally. External
power must be greater than 26V.
The NAMUR outputs are implemented as follows:
4-20 mA Signal Analyzer Condition
0 mA Analyzer unpowered, or completely failed
3.5 mA Critical Alarm - analyzer reading unusable (factory default)
3.8 mA Reading Under Range (Example: user sets range to 2-10%. Current reading is 1.9%)
4 to 20 mA Normal Operation
20.5 mA Reading Over Range (Example: range is 0-10%. Current reading is 12%)
* For combustible and/or methane units only.
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