Hanna Instruments HI 2216 User Manual

Page 18

GOOD LABORATORY PRACTICE (GLP)

RELATIVE

RELATIVE m

m V CALIBRATION

V CALIBRATION

GLP is a set of functions that allows storage and retrieval of data
regarding the maintenance and status of the electrode.
All data regarding pH, Rel mV or ISE calibration is stored for the user to
review when necessary.
EXPIRED CALIBRATION

This instrument allows the user to set the number of days before the next
required calibration. This value can be set from 1 to 7 days. The default
setting is off (disabled). The “

CAL” “INTV” tags will start blinking to

warn the user that the instrument should be recalibrated.
For example, if a 4 days time out has been selected, the instrument will
issue the alarm exactly 4 days after the last calibration.
If the expiration value is changed (e.g. to 5 days), then the alarm will
be immediately recalculated and appear 5 days after the last
calibration.

• Press

CAL when the instrument is in RELATIVE mV measurement

mode. The “

mV” and “ ” tags will be displayed. Absolute mV is

displayed on the primary LCD and “

AbS” message is displayed on the

secondary LCD.

• When the absolute reading is stable and in measurement range, the

instrument asks for confirmation.

• If the reading is out of range, “

WRONG” tag will be displayed.

• Press

CFM to confirm the absolute value. The instrument will display

“

0.0 mV“ on the primary LCD and “rEL” message on the secondary

LCD. In this moment the relative mV offset is equal to absolute mV
reading.

• Use the

ARROW keys if you want to change the displayed relative

mV value.

• Press

CFM to confirm the relative mV value. The relative mV

offset is displayed on the primary LCD. The instrument returns to
measurement mode.

Note: The relative mV value can be changed only inside the relative mV

offset window (± 2000 mV).