Cole Parmer pH 550, Operation Manual

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6. Press the [
↵
] key. A “ WAIT ” message will blink indicating that
the instrument is waiting for a stable reading. The display will be
locked to the buffer value corresponding to the temperature of
buffer 1 (See
IX. pH Buffers ). When a stable reading is reached, the
unit will blink a “ SAVE ” message.
7. Press the [
↵
] key to save the STAND calibration and prepare to
do a SLOPE calibration or press the [ / pH-Recal .] key to
recalibrate buffer 1 and repeat from step 6.
If “
OVER ” or “ UNDER ” (See VIII. ERROR DISPLAYS AND
TROUBLESHOOTING ) is displayed or a blinking “ SAVE ” does
not show after more than few minutes then something is wrong
with your buffer 1 or electrode. Be sure your buffer 1 is correct or
change a new electrode and repeat from step 4.
8. Clean the pH electrode and temperature probe with the de-
ionized/distilled water.
9. Place the pH electrode and Temperature probe into buffer 2.
10. Press the [
↵
] key. A “ WAIT ” message will blink indicating that
the instrument is waiting for a stable reading. The display will be
locked to the buffer value corresponding to the temperature of
buffer 2 (See
IX. pH Buffers ). When a stable reading is reached, the
unit will blink a “ SAVE ” message.
10. Press the [
↵
] key to save the SLOPE calibration or press the
[ /
pH-Recal
.] key to recalibrate buffer 2 and repeat from step 8.
If “
OVER ” or “ UNDER ” ( VIII. ERROR DISPLAYS AND
TROUBLESHOOTING ) is displayed or a blinking “ SAVE ” does
not show after more than few minutes then something is wrong
with your buffer 2 or electrode. Be sure your buffer 2 is correct or
change a new electrode and repeat from step 4.
11. Set-up your Relay, mA OUT and Temperature control.
12. The unit is ready for measurement and control.