Temperature Compensation And Temperature Units - Emerson Rosemount 54eA Manual

MODEL 54eA

5.9 TEMPERATURE COMPENSATION AND TEMPERATURE UNITS

1. Refer to Section 6.1 for a discussion of the ways in which temperature affects amperometric and pH meas-
urements.
pH
Temperature
Noise rejection
Exit
Temp comp : Auto
Temp units: °C
Exit
Temp comp: Manual
Temp units: °C
Temperature : 25.0°C
Exit
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2. Press any key to enter the main menu. Move the cursor to "Program"
and press Enter (F4).
3. Move the cursor to "Configure" and press Enter (F4).
4. Move the cursor to "Temperature" and press Enter (F4).
Enter
5. Use the
change press Edit (F4). Use the arrow keys to change settings to the
desired value. Press Save (F4) to store changes.
Auto: In automatic temperature compensation, the controller meas-
ures the temperature using an RTD (resistance temperature device)
or 22kNTC thermistor in the sensor. The controller then uses the
measured temperature to calculate membrane permeability correc-
Edit
tions, solubility factors (for oxygen only), and the millivolt to pH con-
version factor (for pH-corrected free chlorine only).
Manual: In manual temperature compensation, the controller uses
the temperature entered by the user to calculate membrane perme-
ability corrections, solubility factors (for oxygen only), and the millivolt
to pH conversion factor. It does NOT use the actual process temper-
ature. Do NOT use manual temperature compensation unless the dif-
ference between the calibration and measurement temperatures is
less than 2°C.
Edit
Manual temperature compensation is useful if the sensor RTD
has failed and a replacement sensor is not available.
If Manual temperature compensation is selected, be sure to enter the
desired temperature.
and keys to move through the list of items. To make a
SECTION 5.0
SOFTWARE CONFIGURATION
41