The ACI High Temperature Immersion Series sensors and transmitters are a single point immersionsensor featuring a three wire RTD sensor assembly using Nickel Fiberglass Lead wires, a 316 Seriesstainless steel probe, and a Machined 304 SS Steel thermowell

The “INW” version of the productcan be ordered without the thermowell for applications in which there is an existing thermowell,increased design parameters or other materials are required for higher corrosion resistance

Thethree wire sensors can be used with a two wire transmitter by connecting the two (Red) coloredwires to one of the RTD Terminal blocks with the 3rd wire (White) wire going to the second RTDTerminal block

The purpose of the 3rd wire is to compensate for external lead wire resistancethat will affect the accuracy of your sensor output when using with a three wire temperaturetransmitter or sensor configuration on your Building Management System or PLC (ProgrammableLogic Controller

ACI recommends the use of 18 AWG lead wires to reduce the external lead wireresistance when using a Platinum RTD

The operating specifications are for both the sensor andtransmitter as designated in the specification table

Standard enclosure options include the“-GD” Galvanized or “-BB” Aluminum weather proof enclosure

NIST Certificates are available for all of the configurations listed in the orderinggrid on the back of the product data sheet

For best accuracy, ACI recommends the use of the TTM100 or TTM1K Series Matched transmitters witha 3 or 5 Point NIST Calibration Certificate since they include a second calibration step in which the RTD and transmitter are calibrated together asa system, which removes most of the sensor error over the calibrated temperature span of the transmitter.