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MODEL TCL SECTION 7
PROGRAMMING THE ANALYZER
7.6 CONFIGURING TEMPERATURE RELATED SETTINGS
7.6.1 Purpose
This section describes how to do the following:
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
1. 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 analyzer
reading to increase even though the chlorine level remained constant. A correction equation in the analyzer
software automatically corrects for changes in membrane permeability. In automatic temperature correction,
the analyzer uses the temperature measured by the sensor for the correction.
2. MANUAL TEMPERATURE CORRECTION. In manual temperature correction, the analyzer uses the temper-
ature entered by the user 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
2ºC. Manual temperature correction is useful if the sensor temperature element has failed and a replacement
sensor is not available.
1. Press MENU. The main menu screen appears. Move the cursor to
Program and press ENTER.
2. Choose Temperature.
Program
Outputs
Alarms
Measurement
Temperature
Temperature
7.6.3 Procedure – Configuring Temperature Related Settings
3. The screen summarizes the present sensor configuration. There will be
between two and five items. Units and S1 Temp Comp, always appear.
If manual temperature compensation was selected, the manual
temperature value will also appear. If you have a dual input analyzer,
temperature compensation items will appear for the other sensor. Only
four items are shown at a time. To view the remaining items, scroll to the
bottom of the screen and continue scrolling.
To make a change, move the cursor to the desired line and press
ENTER. A screen will appear in which the present setting can be
edited. To store a setting, press ENTER.
For an explanation of terms, see sections 7.6.1 and 7.6.2.
4. To return to the main display, press MENU then EXIT.
Temperature
Units: C
S1 Temp Comp: Auto
Units: