Steris Basil 4700 - Page 165

7-10
764333-098
7.12.2 pH (Channel B)
Only for Units with pH Option
Install loop calibrator as follows (see Figure 7-11):
a. Position washer power switch to OFF.
b. Connect loop calibrator to Thornton controller
pH output. Make a serial connection.
c. Ensure loop calibrator is in Read mode (scale
4-20 ma).
d. Position washer power switch to ON.
•Output Calibration:
Washer power switch must be ON.
1. Enter in Service Mode as explained in Section 2.1,
How to Enter Service Mode.
2. Press MACHINE SERVICE touch pad. Screen
advances to Machine Service Screen.
3. Press CALIBRATION touch pad.
On Thornton controller:
4. Press CALIBRATION button.
5. Press UP arrow to select Analog, then press on OK/
NEXT button. Display shows:
Cal analog Ch 1
6. Press UP arrow to select Channel 2, then press on
OK/NEXT button. Display shows:
Cal analog Ch 2
7. Press OK/NEXT button. Display shows:
2 : Adj 4mA= 10329
*
* this value is just an example.
NOTE: If loop calibrator does not show 4 ma, on
Thornton controller press UP, DOWN, RIGHT or
LEFT arrows until signal in loop calibrator displays
4 ma.
On washer control panel:
8. Press pH SENSOR touch pad. Display shows Low
Point screen.
9. Press START touch pad. Display shows Low Point
Adjustment screen.
10.In Low Point Adjustment screen, press CHANGE
VALUES touch pad. A numeric keyboard appears.
11.Enter 1 on numeric keyboard and press ENTER
touch pad. Display shows High Point screen.
On Thornton controller:
12.Press OK/NEXT button. Display shows:
2 : Adj 20mA= 52708
*
* this value is just an example.
NOTE: If loop calibrator does not show 20 ma, on
Thornton controller press UP, DOWN, RIGHT or
LEFT arrows until signal in loop calibrator displays
20 ma.
On washer control panel:
13.In High Point screen, press START touch pad.
Display shows High Point Adjustment screen.
14.In High Point Adjustment screen, press CHANGE
VALUES touch pad. A numeric keyboard appears.
15.Enter 15 on numeric keyboard. Press ENTER touch
pad.
16.Summary of Values screen appears; then press OK
touch pad to end pH calibration signal.
On Thornton controller:
17.Press OK/NEXT button, display shows:
Save Changes Y
es
18.Press OK/NEXT button to end pH channel calibra-
tion.