Q. Can the ECT-DIN, configured for 4-20mA input and 4-20mA output, be calibrated to give 4-12mA output when the input is 4-20mA so that the output is 1/2 the input? We have a radio I/O signal that is scaled to 4-20mA for 0-65,535 raw units. When sent to the PLC over MODBUS, it can't be read properly since the maximum register value size for the PLC is limited to 32,767.
A. The ECT with 4-20mA input/output doesn’t have enough adjustability to do a split range like the one you describe. Although it is possible for us to supply a special version of the ECT with 4-12mA or 12-20mA output, or you can use a PC configurable unit such as the CPT/HLPRG/0-20MA/117AC [DIN].
The universal CPT PC-Programmable Temperature Transmitter and Signal Isolator/Converter accepts a direct signal input from a wide array of sensors and analog devices including 23 RTD types, 9 thermocouple types, current and voltage signals, resistance and potentiometer devices, as well as direct millivolt sources. The 4-wire (line/mains-powered) CPT provides an isolated and linear current or voltage output (any range within 0-20mA or 0-10V) proportional to the input. The signal is ready for direct interface with readout instruments, recorders, PLC, DCS, or PC-based SCADA systems.
The CPT data sheet, manual, and configuration software can be downloaded from our site.
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