AcuDew FSV Feature

The new Edgetech Instruments AcuDew Moisture Transmitter, a two wire, loop powered aluminum oxide moisture transmitter, has a unique feature called Field Span Verification, or “FSV”. This standard feature included on all AcuDew transmitters allows the user to adjust the span setting, in many cases by simply exposing the transmitter to ambient air. The FSV feature allows users of the AcuDew to ensure optimum accuracy between laboratory calibrations by checking the span of the instrument and correcting for any deviation. The unique design of the AcuDew’s sensor limits its response to a level corresponding to its calibrated range. This means, regardless of the moisture content, there will be no further increase in response once it reaches its maximum calibrated moisture level.
An AcuDew having a full-scale value of 0°C dew point, for example, the will read 0°C dew point when exposed to a gas with this moisture concentration and will continue to read 0°C dew point as the moisture concentration rises. The transmitter can be adjusted to read 0°C dew point on any gas with a wetter moisture concentration, ambient air for instance, thus setting the calibration curve closely back to its original curve.
For a more accurate span verification, the FSV feature can also be used with a known calibration gas to make the FSV adjustment. FSV should be carried out periodically, every 2 to 3 months, or when verification of instrument performance is required.
Each AcuDew Moisture Transmitter is delivered with an ISO/IEC 17025 certificate of calibration, traceable to NIST. The AcuDew is calibrated and supported in the USA, in a modern ISO/IEC 17025:2005 accredited calibration laboratory located in an ISO 9001:2015 registered facility.

For more information about the AcuDew go to or visit the AcuDew page of the on-line product catalog within this website.