Hach 2100P Instrument And Procedure Manual page 48

SECTION 3,
NOTES
•
If the key is pressed during calibration, the new calibration data
I/O
is lost and the old calibration will be used for measurements. Once
in calibration mode, only the
Signal averaging and range mode must be selected before entering
the calibration mode.
•
If
E 1 or E 2
Check the standard preparation and review the calibration; repeat
the calibration if necessary. Press
(
E 1 or E 2).
twice to restore the previous calibration. If
error may have occurred during calibration. The previous
calibration may not be restored. Either recalibrate or use the
calibration as is.
•
To review a calibration, press
calibration standard values. As long as
is not flashing, the calibration will not be updated. Press
CAL
again to return to the measurement mode.
3.6.3.1 Preparing User-selected Formazin Dilutions
The formazin solutions should span the entire range of the instrument.
Hach recommends preparing three standards:
1. 10 to 30 NTU
2. 90 to 110 NTU
3. 700 to 900 NTU
The standards must have a difference of at least 60 NTU.
In addition, a blank made from the dilution water should be prepared.
Prepare the formazin standard solutions from the well mixed 4000 NTU
stock solution as specified in Section 3.6.2.4 on page 42 and dilution
water as specified in Section 3.6.2.2 and Section 3.6.2.3 on page 41.
Make the standards immediately before use and discard them after
calibration is done.
continued
are displayed, an error occurred during calibration.
To continue without repeating the calibration, press
↑, and → keys function.
READ, I/O,
to cancel the error message
DIAG
CAL?
and then ↑ to view the
CAL
READ
48
is displayed, an
is never pressed and
I/O
CAL