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MODEL SOLU COMP II SECTION 6.0
CALIBRATION
6.6 ENTERING A KNOWN SLOPE VALUE — pH
6.6.1 Purpose
If the electrode slope is known from other measurements, it can be entered directly in the Solu Comp II analyzer.
The slope must be entered as the slope at 25°C. To calculate the slope at 25°C from the slope at temperature t°C,
use the equation:
slope at 25°C = (slope at t°C)
Changing the slope overrides the slope determined from the previous buffer calibration.
6.6.2 Procedure
CCaalliibbrraattee
Hold
Program Display
Calibrate?
SSeennssoorr11
Sensor2
CalSensor1?
MMeeaassuurreemmeenntt
Temp
pH Slope 25°C?
S1: 59.16mV/pH
Changing slope
overrides bufcal.
Invalid Input!
S1 Standardize
SSllooppee
BufferCal
S1 Standardize
SSllooppee
BufferCal
1. Press MENU. The main menu screen appears. Choose Calibrate.
2. Choose Sensor1 (pH sensor).
3. Choose Measurement.
4. Choose Slope.
5. The screen at left appears briefly.
6. Change the slope to the desired value. Press ENTER.
7. The slope must be between 45 and 60 mV/pH. If the value entered is out-
side this range, the screen at left appears.
8. If the entry was accepted, the screen at left appears.
9. To return to the main display, press MENU followed by EXIT.
298
t°C + 273
53