1. Choose temperature units.
2. Choose automatic or manual temperature correction for membrane permeability
(chlorine sensor).
3. Enter a temperature for manual temperature compensation.
7.6.2 Definitions - chlorine
Automatic
temperature
correction
The total chlorine sensor is a membrane-covered amperometric
sensor. The permeability of the membrane is a function of
temperature. As temperature increases, membrane permeability
increases. Thus, an increase in temperature will cause the sensor
current and the transmitter reading to increase even though the
chlorine level remained constant. In automatic temperature
correction, the transmitter uses the temperature measured by the
sensor for the correction.
Manual
temperature
correction
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.
7.6.3 Procedure - configuring temperature related settings
Complete the following steps to set the temperature units and to select automatic or
manual temperature correction.
1. Press MENU.
The main Menu screen appears.
2. Move the cursor to Program and press ENTER.
3. Choose Temperature.
The screen summarizes the present sensor configuration. There are between two
and five items. Units and S1 Temp Comp always appear. If manual temperature
compensation was selected, the manual temperature value also appears. If you have
Programming the transmitter
54 Rosemount TCL
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