Wiring
Standard Wiring
Current Output
There are three configurations available for the 4–20 mA current output:
– Isolated, loop-powered (default)
– Isolated, self-powered
– Intrinsically safe, isolated, self-powered output requiring an optional ISIO board
(see Wiring the Optional ISIO Boards)
All configurations can drive a 750-ohm maximum load over the full current output
range. The current output is programmable between 3.8 and 20.5 mA. The current
output has a fault low condition of 3.6 mA or less and a fault high condition of 20.8
mA or greater.
The default current output configuration is isolated, loop-powered.
Figure 4-8. 4–20 mA Isolated, Loop-Powered Configuration
Figure 4-9. 4–20 mA Isolated, Self-Powered Configuration
Voltage Input
The Main CPU PCA allows for a user-provided 0-10 volt voltage input on connector
J1A. The maximum cable length from the gauge to each transmitter is 25 feet.
Refer to the DensityPRO Measurement System User Guide (p/n 1-0702-016) for
details on how to configure the gauge to use the voltage input signal.
Figure 4-10. Voltage Input Wiring
Thermo Scientific DensityPRO Installation Manual 4-9
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