The Honeywell 4129 is a high-accuracy humidity transmitter targeted for OEM applications requiring %RH measurement. The 4129 provides a temperature compensated 4-20 mA humidity output.

Temperature compensated humidity output on the 4129 is automatically corrected over the full range of operating conditions. The 4129 transmitter provides one 4-20 mA output proportional to 0-100% RH.

Portable transfer standards are available which can be used as references to verify and/or adjust the relative humidity calibration online. The transmitter incorporates a test jack which allows its %RH output to be read on an optional plug-in digital indicator. Use of the reference standards, as well as the plug-in indicator, permits easy calibration verification. Single point adjustment may then be made if necessary.

The 4129 can be ordered with a remote probe with user-specified cable lengths of 6, 25 or 50 feet. Weatherproof housings, duct or wall mount are suitable for outdoor use.

N.I.S.T. traceable calibrations can be made available. Certification of N.I.S.T. traceability is available as an option.