Dry Basis Measurements - Process Sensors MCT Series Installation And Operation Manual

Appendix III – Dry Basis Measurements
It is common for some industries, particularly the wood panel industry to calculate the moisture in the
wood particles as a percentage of the dry material rather than a percentage of the wet material.
Wet % = Wet Weight – Dry Weight
Wet Weight
Dry % = Wet Weight – Dry Weight
Dry Weight
Conversion from Wet % to Dry % is as follows:
% Dry = % Wet
(100-% Wet)
Conversion from % Dry to % wet is as follows:
% Wet = % Dry x 100
(100 + % Dry
The MCT may be configured to present moisture on a dry basis by selecting DRY: Y in the
Engineering Menu.
This selection does the following to the sensor parameters:
1. The displayed moisture readings are presented in the Dry Basis.
2. An asterisk appears in front of the 'Moisture' word in the display to alert users that the sensor is
in the DRY mode.
3. The Calibration routine is modified to allow dry basis MCT and laboratory values to be used.
Online Trim Adjustments
When operating in the Dry Basis Mode, a change to the Zero parameter of the calibration will not make
the same adjustment to the moisture reading. This is because the moisture reading is being modified by
the wet to dry conversion factor.
To allow users to make a simple trim adjustment to the sensors reading and additional calibration
parameter is presented in the Cal parameters when in the Dry Basis Mode.
This is:
OFFSET.
The default setting for it is 0.00.
To make a reduction in the displayed moisture reading of 0.5, make the OFFSET be –0.5.
To make an increase to the moisture reading of 0.8, make the OFFSET be + 0.8
When initially calibrating a sensor ALWAYS set the OFFSET to 0.00
x 100
58