Emerson Rosemount MCL-220 Reference Manual page 48

Programming the transmitter
May 2019
Manual
temperature
correction
6.6.3 Configure temperature related settings
Complete the following steps to set the temperature units and to select automatic or
manual temperature correction.
This section describes how to do the following:
1. Choose temperature units.
2. Choose automatic or manual temperature correction for membrane permeability.
3. Enter a temperature for manual temperature compensation.
Procedure
1. Press MENU.
2. Move the cursor to Program and press ENTER.
3. Choose Temperature.
48
sample and membrane permeability. Membrane permeability is a
function of temperature. As temperature increases, permeability
increases. Thus, an increase in temperature will cause the sensor
current and the transmitter reading to increase even though the
concentration of monochloramine remained constant. In automatic
temperature correction, the transmitter uses the temperature
measured by the sensor to continuously correct for changes in
membrane permeability.
In manual temperature correction, the transmitter uses the
temperature you enter for correction. It does not use the actual process
temperature. Do not use manual temperature correction unless the
measurement and calibration temperatures differ by no more than
about 2 °C. Manual temperature correction is useful if the sensor
temperature element has failed and a replacement sensor is not
available.
The main Menu screen appears.
The screen summarizes the present sensor configuration.
There are between two and three items. Units and S1 Temp Comp always appear. If
you selected manual temperature compensation, the manual temperature value
entered for the sensor (S1 Manual) also appears.
Reference Manual
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