Dew Point Sensor Calibration Procedure

Only shaw dew point instruments include the autocal function for quick and easy calibration.

Dew point sensor calibration procedure.

An integrated auto calibration procedure permits a measurement accuracy of 2 c td. The cap should only be removed immediately before installation into the application. The capacitive polymer sensor is bonded together with a temperature sensor and dew point is calculated from the humidity and temperature readings. For 0 c the value refers to frost point.

The entire calibration process conducted within controlled laboratory environment and with nist certified reference measuring instruments. The target test point for this calibration is 35 c dew point to accomplish this elevated dew point it will be necessary to operate the test chamber at a test temperature of 40 c. Kingdom accreditation service for the calibration of dew point hygrometers since 1986 laboratory number 0179 and our current dew point calibration range is 90 to 90 c 130 to 194 f. The rec ommended calibration interval is 2 years.

Upon delivery the sensor is protected by a cap that keeps the dew point sensor dry. As the largest manufacturer of dew point sensors in europe michell instruments has over 2000 sensors under calibration at any moment in time in our own production facility in ely uk in addition to local calibration centres in situated in the netherlands france italy germany china japan and usa. Each and every excelencia dew point meter goes through a lengthy factory calibration procedure to ensure the better accuracy of measurement and analysis. Please view humicalc example screen fig 6 6.

This is to demonstrate the importance of dew point sensor calibration. Worse case scenario physical moisture will end up in the. High accuracy sensors for low dew point. The dew point sensors from e e elektronik measure accurately dew point temperature down to 60 c td 76 f td with pressure rating up to 100 bar 1450 psi the employed e e monolithic humidity and temperature sensing element together with a special auto calibration procedure lead to high accuracy and excellent long term stability.

Automatic calibration of dew point meters also known as autocal allows users to ensure accuracy between laboratory calibrations by checking the span of the instrument and correcting for any deviation. The sensor is heated at regular intervals during the automated auto calibration procedure. Usually when a sensor is out of calibration it will read low. This is a major advantage of the shaw dew point instruments.

Dew point transmitter dew point sensor dew point mirror calibration object 1 according to the bipm service category 3 1 dew point is used as term for the measurand. Calibration 0 c can also be carried out for the calculated dew point temperture. Vaisala s patented auto calibration function optimizes the measurement stability at low dew points.