Run A Check Standard - Hach PHC28101 User Manual

1. Connect the 2. For the best
probe to the stabilization time,
meter. Make sure condition the
that the cable probe in the
locking nut is sample for at least
securely 10 minutes before
connected to the the initial sample
meter. Turn the measurement.
meter on.
6. Repeat steps 7. When
2-4 for additional measurements
measurements. are done, store
the probe (refer to
Storage
on page 10).

Run a check standard

Measurement procedure:
3. Rinse the
probe with
deionized water
and then with the
sample. Blot dry
with a lint-free
cloth.
The run check standard feature validates instrument performance between sample
measurements. Use the run check standard feature for periodic or user-defined interval
measurements of a traceable standard solution. Set the criteria for check standards from
the PHC281 Settings menu.
Note: Access control must be off or a valid password must be entered before any of the check
standard method options can be changed.
1. Push . The Full Access Options menu is shown.
2. Select Run Check Standard.
Note: Select the correct probe if two probes are connected to the meter.
3. Get the standard solution shown on the display.
4. Rinse the probe with deionized water. Blot dry with a lint-free cloth.
5. Put the probe in the standard solution until the temperature sensor is completely
submerged. Move the probe up or down or gently tap on the beaker to remove air
bubbles from the probe.
4. Put the probe 5. Push Read.
in the sample and The display will
stir gently. Make show "Stabilizing"
sure that the and a progress
reference bar as the probe
junctions are stabilizes in the
completely sample. The
submerged. Do display will show
not put the probe the lock icon when
on the bottom or the reading
sides of the stabilizes.
container. Shake
the probe from
side to side in the
sample to refresh
the reference
junction.
5