TXP-C20_Instruction_Manual_(Rev1.0)
REV – 1.0
[34-2900-0207-5 ]
27
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P a g e
AC or DC power supplies to relays on the Discrete Relay PCB option must be the same for each relay. Example:
24VDC should not be the power switched by one relay and 115VAC by others.
Figure 4-6 – Optional Electrochemical Sensor Input Board
4.1.7
Optional 4-20mA Analog Output Board
Important!
Analog Output Board PCB’s may only be installed into motherboard position P2.
An optional 10-bit 4-20mA analog output board, shown in Figure 4-8, may be added. Each channel’s output will
transmit 4mA for 0% readings and 20mA for 100% readings. If the TXP-C20 primary power is 100 – 240 VAC or at
least 24 VDC, 4-20mA outputs are capable of driving 20mA through a 750-ohm load. Outputs are self-powered and
DC power should not be provided by the receiving device. Precision calibration of the 4-20mA output DAC (digital to
analog converter) is accomplished via the
Diagnostics
menu as described in section 2.3.5.
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