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The alarm contacts of
HI 8931
remain closed during normal operation. If
the measured conductivity level is not within the tolerance of the set value,
the alarm contact will be open.
TAKING MEASUREMENTS WITH HI 8931
After setting the working point and alarm value, press the "MEASURE"
key. The actual conductivity value of the test solution will be displayed.
If the reading is out of range the instrument displays:
When Above Setpoint Control is selected (SET SELECT pins open) the SET
ON LED lights up when the reading is higher than the setpoint.
When Below Setpoint Control is selected (SET SELECT pins short) the SET
ON LED lights up when the reading is lower than the setpoint value.
When the dosage switch is in OFF or continuous
ON position the corresponding LED blinks (the
LED on the right side of the switch).
If the dosing switch is in OFF position the dosing
and alarm relays are deactivated and the SET
ON is OFF.
If the dosing switch is in ON position the DOSING relay is always
activated and the SET ON LED lights up; the ALARM relay is activated
and the ALARM LED blinks according with the input reading, setpoint
and ALARM threshold.
If the dosing switch is in AUTO position, all relays are controlled depend-
ing on measure, setpoint and ALARM threshold.
