EC500-en-GB_v2.6 10/14
9
Operational Matrix
Function /
Resulting Action
Power
Status
Mode
Setting
Required Key Press Sequence
On/Off On or Off Any Momentary press of the ON/OFF key
Calibration On pH or
Conductivity
Press & hold CAL/RECALL key for 2
seconds, until it enters CAL function
Store Reading On Any measure
mode
Momentary press of the
MODE/HOLD key
Hold Release On While In Hold
Mode
Momentary press of the
MODE/HOLD key
Enter Memory
Retrieval
On Any measure
mode
Momentary press of the
CAL/RECALL key followed by a
momentary press of the
MODE/HOLD key (Within 4 seconds)
Scroll Stored
Readings
On Memory
Recall
Momentary press of the
MODE/HOLD key
(Displays “last in first out”)
Exit Memory
Retrieval
On Memory
Recall
Momentary press of the
CAL/RECALL key
Clear Stored
Memory
On Any Measure
Mode
Press and hold the ON/OFF key for 4
seconds, until “clr” is displayed.
Change
Measurement Mode
On Any Press and hold the MODE/HOLD key
for at least 2 seconds (the modes will
scroll by until the key is released)
Enter Cond/TDS
Ratio
On TDS (ppm or
mg/l)
Press and release the CAL/RECALL
key twice in quick succession
Change Cond/TDS
Ratio
On TDS ratio Momentary press of the
MODE/HOLD key (each key press
increases the ratio by 0.1, the value
cycles from 0.4 - 1.0)
Exit Cond/TDS
Ratio
On TDS ratio Momentary press of the
CAL/RECALL key
Change
Temperature Units
Off n/a (off
mode)
Press and hold the CAL/RECALL key
then momentarily press the On/Off
key. Release the CAL/RECALL key
after the "SELF CAL" lights
Override Auto
Power Off
On Any measure
mode
Momentarily press the CAL/RECALL
key then simultaneously press and
hold the ON/OFF & MODE/HOLD key
for approximately 2 seconds, until
“oFF” is displayed
Default Reset OFF n/a Simultaneously press ON/OFF,
CAL/RECALL and MODE/HOLD
momentarily. “dFLt” will be displayed.
