Q: I am looking for a signal conditioner that has multiple inputs (RTD) that can be averaged on one mA output.  What do you recommend?

A: First determine how many RTDs you need to average, the number of wires (2-wire, 3-wire, or 4-wire), and are the cable lengths the same for each RTD? Then we can help you determine which product will fulfill your specific needs.

Moore Industries has several products that can handle multiple RTD inputs and provide a calculated average output. 

Both field-mount and Din-mount models are offered.  The THZ3/TDZ3 models handle two RTD inputs while the SPT, MDS and NCS handle three or more RTD inputs.  If you have an application that involves Safety Instrumented Systems (SIS), the STZ transmitter family can be used.

The THZ3 is a smart HART two-wire, output loop powered transmitter that comes in a hockey puck configuration for field mount applications or in a DIN rail mount package for cabinet installations.  The TDZ3 is a field mount unit with an integral display.  Both units offer the ability to output a 4-20mA signal that represents the average of the RTD inputs.

The SPT accepts T/C, RTD, millivolt, or ohms input in different ranges, sensor types, and connection schemes.  The SPT has a simple menu system and LCD screen for easy setup and calibration, and all settings are stored in non-volatile memory, protecting them from power loss.

The I/O Equation Station Multifunction Distributed I/O System (MDS) is a four-wire module that can average up to 4 RTDs.  The number of wires per RTD depends on the number of RTDs that can be connected. 

The Net Concentrator System (NCS) is an expandable I/O system that consists of input and output modules that  can be configured to accept any number of RTD inputs to calculate an average output. The NCS can be programmed to handle a wide range of signal input and output including current, voltage, discreet, relay, RTD, thermocouple, resistance, and potentiometer with an operating range of -40°C to +85°C.

Do you want more information? Download the data sheet. Or visit the catalog.

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