36
MODEL SOLU COMP II
SECTION 6.0
CALIBRATION
6.6 ENTERING A KNOWN SLOPE VALUE
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 or Sensor2. For a single input configuration, the
Sensor1 Sensor2 screen does not appear.
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 enter the slope for the other sensor, press EXIT twice. Choose the
other sensor and repeat steps 3 through 6.
10. To return to the main display, press MENU followed by EXIT.
298
t°C + 273