Sigma 900 MAX Refrigerated Sampler Instrument Manual

Page 72
ORP Probe
8990options.fm
Section 5
Probes must be calibrated to the sampler each time they are cleaned or
replaced. Regular inspection and comparison to a hand-held pH meter can
help determine the optimum cleaning and calibration schedule for
specific applications.
1. From the Main Menu, select
OPTIONS > ADVANCED OPTIONS >
CALIBRATION > pH.
2. Place the pH probe into the first buffer solution, then press any key
to continue.
3. Enter the temperature of the first buffer solution using the numeric
keypad. Press
ACCEPT to continue.
4. Select the pH for the first buffer solution (4, 7, or 10 pH) using the
CHANGE CHOICE key, then press ACCEPT.
5. Remove the probe from the first buffer solution, rinse it under distilled
water and place it into the second buffer solution (4, 7, or 10 pH, different
from the first buffer used). Press any key to continue.
6. Select the pH for the second buffer solution using the
CHANGE CHOICE
key, then press
ACCEPT.
If the pH probe is damaged and cannot be calibrated or if the buffer
solutions do not fall within an acceptable range, an error message will be
displayed as shown below.
Another attempt at reading the second buffer solution will be made after
pressing a key. If this fails, it is likely that you have a bad pH probe or bad
buffer solutions. Try a new set of buffer solutions and if that fails try a
different pH probe
5.3 ORP Probe
The probes are shipped with a wetting cap that covers the probe tip. Remove
the cap by turning it counter-clockwise and gently easing it off. Keep this cap
for long-term probe storage. Rinse the probe tip with distilled water.
Store the probe in a pH 4.0 buffer (Cat. No. 22834-49) for both overnight and
long term storage. Never store a probe in distilled or deionized water because
this will deplete the probe filling solution.
5.3.1 ORP Probe Connection
This connector is for installing the pH or ORP pre-amp interface junction box
or a stand-alone temperature sensor. The ORP probe is attached to a
terminal strip in the junction box.
11:00 AM 21 - APR - 01 ERROR MESSAGE
pH CALIBRATION FAILED-GAIN
AND/OR OFFSET OUT OF RANGE
TRY AGAIN
(PRESS ANY KEY TO CONTINUE)