YSI EcoSense pH100 - Manual (Page 7)

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3. If AUTOLOCK is off, the pH value of the sample displays on the screen. If both pH and
temperature readings are stable, take a reading. If AUTOLOCK is on, press MEA./EFF.
“WAIT” flashes until the unit determines a stable pH reading.
Temperature Measurements
The model pH100 can measure temperature independently with the ATC/Temp probe without
using the pH electrode. Place the ATC/Temp probe in the media to be measured. The measured
temperature displays.
mV Measurements
1. Connect the optional combination mV electrode to the unit. Press MODE to enter mV mode
with AUTOLOCK on or off as desired. For inherently unstable samples, the unit will not
AUTOLOCK. Use mV mode with AUTOLOCK off in this case.
2. Rinse electrode with distilled water and immerse it in sample to be measured. If AUTOLOCK is
off, the mV value of the sample will be displayed on the screen. If AUTOLOCK is on, press
MEA./EFF. “WAIT” flashes until the unit determines a stable mV reading.
TROUBLESHOOTING
MAIN
DISPLAY
POSSIBLE CAUSE CORRECTIVE ACTION
Er 1
• pH electrode offset is greater/less than
+/-1.5 pH.
• STAND was pressed before the
electrode and ATC/Temp probe settle to
within ±1.5 pH of the buffer value.
• pH electrode is faulty
• Replace the buffer and/or the
pH electrode. Press ESC.
• Allow sufficient time for the
electrode and ATC/Temp probe
to stabilize.
• Return for service.
Er 2
• pH electrode slope is off by more than
30% of ideal slope.
• SLOPE was pressed before the
electrode and ATC/Temp probe settled
to within 30% of the buffer value.
• Buffer 4.00, 4.01, 9.18 or 10.01 is not
correct.
• Check that the correct buffer is
used and that the electrode
slope is not off by more than
30% from the theoretical slope.
• Allow sufficient time for the
electrode and ATC/Temp probe
to stabilize.
• Replace the buffer and/or the
pH electrode. Press ESC.
• Return for service.
Er 3 • Temperature is out of the 0.0 to 60.0 °C
range.
• Bring the buffer temperature
within range.
• Return for service.
OvEr/Undr
• Measured pH is out of the 16.00/-2.00
pH range.
• Measured mV is out of the 1250/-2000
mV range.
• Measured temperature is out of the -
10/120 °C range.
• Bring the out of range unit into
the correct measuring range.
• If units are within proper range,
return product for service.
SPECIFICATIONS
Display Range Accuracy Resolution
pH -2.00 to 16.00 pH ±0.1%, ±2 lsd 0.01 pH
mV -1999 to 1250 mV ±0.1%, ±1 lsd 1 mV
Temperature °C -10.0 to 120 °C ±0.5 °C 0.1 °C