YSI pH1200 - Manual (Page 8)

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T E M P E R A T U R E M E A S U R E M E N T S
The pH1200 can measure temperature independently with the ATC/
temp probe without using the pH electrode. Place the ATC/temp
probe in the sample. The unit will display the measured temperature.
m V M E A S U R E M E N T S
MEASUREMENT IN THE MV-AUTOLOCK MODE
1. Connect the optional combination ORP electrode to the BNC
connector of the unit.
2. Press “Mode” key until “mV” and “AUTO” light up.
3. Rinse electrode with distilled water and immerse in the sample.
Remove air bubbles by shaking/stirring the probe.
4. Press the “Meas.” key. “WAIT” will flash. The unit is waiting for a
stable reading. The display will track the mV value as sensed by the
ORP electrode
5. When “WAIT” disappears, the reading is then in “HOLD” mode and
will not respond to further changes from the sample. The mV value
is the sample reading.
Note: For samples that are inherently unstable, the unit will not
AUTOLOCK. In this case, use the mV-NON-AUTOLOCK mode for
measurements.
MEASUREMENT IN THE MV NON-AUTOLOCK MODE
1. Connect the optional combination ORP electrode to the BNC
connector of the unit.
2. Press “Mode” key until “mV” lights up.
3. Rinse electrode with distilled water and immerse in the sample.
4. Allow sufficient time for the display to stabilize. The instrument will
display the mV value of the sample.
T R O U B L E S H O O T I N G
Error on
Main
Display
Display
Possible cause(s)
Corrective Action(s)
"Er1" 1. “Stand” was pressed
before the electrode
and ATC/Temp probe
settled to within +/-1.5
pH of the buffer value.
2. pH electrode offset is
greater or less than +/-
1.5 pH.
3. pH electrode is faulty.
1. Press “Clear” key, allow
sufficient time for the
electrode and ATC/Temp
probe to stabilize, press
“Stand” again to start the
calibration procedure.
2. Replace the buffer and/
or the pH electrode.
Press “Clear” key to
recalibrate meter.
3. Replace electrode.
"Er2" 1. “Slope” was pressed
before the electrode
and ATC/Temp probe
settled to within 30%
of the buffer value.
2. Buffer 4.00, 4.01,
9.18 and 10.01
are incorrect.
3. pH electrode slope
is off by more than
30% of ideal slope.
1. Allow sufficient time for the
electrode and ATC/Temp
probe to stabilize, press
“Slope” key to continue the
calibration procedure.
2. Check if the correct
buffer is used.
3. Replace the buffer and/
or the pH electrode.
Press “Clear” key to
recalibrate meter.
"Er3" 1. Temperature is
out of the 0.0 to
60.0°C range.
1. Bring the buffer or sample
temperature within range.
"over" /
”undr” 1. Measured pH is
out of the 0.00 to
14.00 pH range.
2. Measured mV is out
of the –1999.9 to
1999.9 mV range.
3. Measured
temperature is
out of the 0.0 to
100.0°C range.
1. Bring sample pH into the
correct measuring range.
2. Bring sample ORP into the
correct measuring range.
3. Bring sample temperature
into the correct
measuring range.