Calibration Page - ABB 4670 Series User Manual

...5 START UP AND OPERATION

5.2.2 Calibration Page

Calibration involves standardizing the instrument using either a Dry Calibration Standard of a known turbidity value or by using a
formazine standard solution, details of which are given in Section 7.
Example calibration sequences using the Dry Standard and a Formazine Standard, follow. Specific details of calibration procedures
for all models are also given in Section 7.
For calibration in suspended solids mode, refer to Appendix B1.2.
Dry Standard Calibration – see also Section 7.1.3
– – – – –
SENSOR CAL.
0 0 0 0 0
Cal. User Code
0 0 0 0 0
Formazine Std.
DRY CAL. STD.
0 0 0
.
Zero Calibration
– – – – –
Calibrating Zero
1 2 0 .
Use Dry Standard
– – – – –
Calibrating Span
– – – – –
Cal. Complete Calibration Fail
0 0 0 0 0
SECURITY CODE
20
Model 7997 200 Series
Enter the required calibration code number, between 00000 and 19999. If an incorrect value
is entered, access to calibration is prevented and the Calibration Page is displayed.
Select DRY CAL.
STD. by pressing
the key.
Command to insert Dry
Calibration Standard Cell.
Zero on label faces the
receiver.
After one of these actions, press
Displayed for approximately one minute, after which the sequence changes to Use Dry
Standard.
––
Use the
Rotate Dry Standard through
180 so that the NTU value label
faces the receiver.
Press
Press immediately to advance to Cal. Complete, if span calibration is not required.
Displayed for approximately a minute, after which the sequence changes to
Cal. Complete
– – – – –
Calibration is now complete.
Advance to Access to Secure Parameters – Section 6.1.
Model 7997 300
––––– Advance to next parameter.–––––
–––––– Calibration Access ––––––
–––––––– Dry Standard ––––––––
Select DRY CAL.
STD. by pressing
the
–––––– Zero Calibration ––––––
Command to fill chamber
with demineralised water.
. The display changes to Calibrating Zero.
–––––– Calibrating Zero ––––––
Insert the Dry Standard.
–––– Span using Dry Calibration Standard. ––––
or keys to set the value of the standard being used.
Insert Dry Standard with the
FTU value label facing the
receiver.
. The display changes to Calibrating Span.
–––––– Calibrating Span ––––––
Cal. Complete (Calibration completed).
calibration was not produced by the sensor.
Model 7997 400
Select DRY CAL.
STD. by pressing
the
key.
Command to immerse the
sensor in de-mineralised
water.
Insert the Dry Standard.
Insert the Dry Calibration
Standard.
Cal. Fail
Cal Fail indicates that the expected
step change between a zero and span
Check the Dry Standard, calibration
solutions, and repeat the procedure.
5.2.2 Calibration Page continued...
key.