YSI EcoSense pH100 - Manual (Page 5)

KEY FUNCTIONS OF THE MODEL pH100
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. For long term storage, remove the batteries.
2. MODE: Selects display mode. Press MODE to sequentially display pH-AUTOLOCK , mV-
AUTOLOCK , pH, and mV. 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.
Δ 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
STAND
SLOPE ATC
MAN
B
A
T
AUTO
WAIT HOLD EFF%
pH
mV
1
2
3
4
5
6
7
8
9
10
C
Figure 2. 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.
OPERATIONAL PROCEDURES
Buffer Set Selection
The pH100 has two buffer sets: 7.00, 4.01, 10.01 pH and 6.86, 4.00, 9.18 pH. The factory
default is buffer set 7.00, 4.01, and 10.01. To change the buffer set, turn off the unit and place
the sensor in buffer 7.0. Next, turn the unit on while pressing and holding the STAND key.
Continue pressing the STAND key until the unit beeps. If the unit is uncalibrated and in pH
mode, it displays “7.00” if the first set is active, and “6.86” if the second set is active.
4