The ACI Transmitter Rigid Averaging Series features a two-wire, 4 to 20 mA loop powered output signal with an optional 3-Wire voltage output signal available

The Rigid Averaging sensors are designed to be installed in small to medium size ducts to give you a better average compared to that of a single point sensor

All transmitters include Zero and Span adjustments for field calibration and are calibrated using NIST Certified Calibration equipment

ACI recommends the use of an 18 to 22 AWG shielded cable for all temperature transmitter installations to help eliminate the possibility of noise being introduced onto the signal lines

The 1K Ohm Rigid Averaging sensor assemblies include a continuous sensing element the covers the entire length of the stainless steel probe and are manufactured using colored Etched Teflon lead wires to differentiate between the different sensor types

All units are hermetically sealed using our epoxy material to eliminate the effects of moisture on the sensors

The Rigid Averaging transmitters include a foam pad to properly seal the duct and limit vibration once installed

Optional NEMA/IP rated weather proof enclosures are available as specified on the back of the product data sheet

For best accuracy, ACI recommends the use of the A/TTM Series Matched transmitters with a 3 or 5 Point NIST Calibration Certificate, since they include a second calibration process in which the RTD and transmitter are calibrated together as a system

On larger ducts, ACI’s bendable copper averaging transmitter should be used for better coverage and control of the air inside of the duct.