Ph Slope Adjustment - Emerson Rosemount Analytical HART 5081-A-HT Instruction Manual

MODEL 5081-A

13.5 pH SLOPE ADJUSTMENT

1. If the slope of the glass electrode is known form other measurements, it can be entered directly into the trans-
mitter. The slope must be entered as the slope at 25°C. To calculate the slope at 25°C from the slope at tem-
perature t°C, use the equation:
Changing the slope overrides the slope determined from the previous buffer calibration.
CALIBRATE
pH CAL
EXIT NEXT ENTER
CALIBRATE
pH slOpe
EXIT NEXT ENTER
CALIBRATE
slOpe
59 . 16
EXIT ENTER
72
slope at 25°C = (slope at t°C)
2. Press CAL on the remote controller.
3. Press NEXT until PH CAL appears. Press ENTER.
4. Press NEXT until PH SLOPE appears. Press ENTER.
5. The SLOPE prompt appears. Use the arrow keys to change the flash-
ing display to the desired slope. Press ENTER to save.
6. Press RESET to return to the main display.
298
t°C + 273
SECTION 13.0
CALIBRATION - pH