VWR pH110 Manual Del Usuario página 6

Battery Disposal
This instrument is powered by a 9 volt battery, which the user must remove and dispose of when the
batteries no longer power the instrument. Disposal requirements vary by country and region, and
users are expected to understand and follow the battery disposal requirements for their specific
locale.
KEY FUNCTIONS OF THE MODEL pH110
1. : Turns the unit ON or OFF. The pH calibration values are not erased when the unit is
turned off. The unit powers up in the same status as when it was turned off. When the unit
is not in use, turn it off to save battery life. The instrument has a 30 minute auto shut off
feature when not in use. For long term storage, remove the batteries.
2. MODE: Selects display mode. Press MODE to sequentially display pH-AUTOLOCK , mV-
AUTOLOCK , pH, mV, Recall and Delete. Calibration values are not affected by changing
display mode.
3. STAND and SLOPE Keys: Used for dual-point pH calibration of the unit. Press and hold
STAND while turning on the power to change buffer sets.
4. ∆ and ∇ Keys: Press to enter temperature values in manual (MAN) mode. These keys are
inoperative when operating in ATC mode.
5. MEA./EFF.: Press to release the unit from AUTOLOCK status when operating in pH-
AUTOLOCK or mV-AUTOLOCK mode. Press and hold for 5 seconds to display the
electrode efficiency.
6. ESC: Press to clear the unit when an error signal appears; it clears all calibration values
stored in internal memory. To prevent accidental clearing during normal use, the key does
not respond unless pressed and held for 2 seconds. The key responds only when an error
message displays.
When ESC is pressed, all LCD elements light. After about 2 seconds, the unit enters pH-
AUTOLOCK mode. "AUTOLOCK" displays and "STAND" begins to flash indicating the
need for calibration. Press ESC only when errors occur that require unit re-calibration.
THE LCD DISPLAY
1. WAIT: Displays while unit waits for a stable
reading or end point sensing.
2. BAT: Low battery indicator.
3. ATC/MAN: "ATC" displays if an ATC probe
is connected. Otherwise, "MAN" displays.
4. STAND/SLOPE: "STAND" or "SLOPE"
remains steady if the parameter has been
calibrated. If either one has not been
calibrated, it flashes.
5. AUTO: Autolock mode indicator.
6.
HOLD: Indicates a reading is frozen during Autolock mode.
7. EFF%: Displays when the user views electrode efficiency. It is recommended to replace the
electrode when efficiency is less than 75%.
8. pH/mV : Unit and mode indicators.
9. Main display for pH, mV and probe efficiency values.
10. °C: Temperature display.
Figure 2. LCD Display
2