Baker Hughes High-Temperature Moisture Transmitter with Two Current Loops DewPro MMR101

Factory Calibration - Fifty-five calibration values covering the entire measuring range are determined at the factory. NIST-certified reference instruments are used for calibration (NIST = National Institute for Standardization Technology). The calibration certificate supplied with the sensor confirms that the sensor matches the reference values.

Recalibrations - Just like moisture measurement, the recalibration cycle greatly depends on the operating conditions (contamination, aggressive media, etc.) and sensor stress. Under normal process conditions, the sensor check / recalibration should be performed after one to two years. This cycle may be longer or shorter depending on operating conditions and accuracy requirements.

Field Validation - The user can perform a sensor check in the field. This validation takes place at room temperature (approx. 25oC) using saturated salt solutions. It is intended as a decision aid in determining whether or not recalibration or sensor replacement is required. This check should be performed using an Panametrics test unit with saturated salt solutions of 11.3 and 75.4% relative humidity that can be ordered from the factory.;

- Remove the filter and clean with a strong (halogen-free) solvent or by flushing with oil- and dust-free, dry air.

- In the case of processes with a high concentration of finely distributed particles, additional filtering may be required to prevent clogging of the sintered protective filter.

- Make sure that the filter does not contain any solvent residue before screwing it back onto the sensor.

- The sensor element must always be handled very carefully. If soiled, it may be briefly swished in a solvent (pure hexing, toluene or acetone).

- After cleaning the sensor with solvent, allow sufficient time for it to dry before reinstalling it.;