14
• The alarm is activated for readings varying as follow:
HI9910
: 0.5 to 2.5 pH (user-selectable) above or below the setpoint;
HI9911
: 0.5 to 2.5 pH (user-selectable) lower than the ALKALINE
setpoint or higher than the ACID setpoint;
HI9920
: 50 to 250 mV (user-selectable) above or below the setpoint.
RECORDER OUTPUT CONNECTIONS
• The recorder output contacts are isolated from the controller circuitry
to avoid interference.
Before wiring, select the desired output
(0-20 or 4-20 mA) with the selector
switch.
The mA output value corresponds to the pH or ORP value over the
whole measurement range. For example, when measuring pH 7, the
output value is 10 or 12 mA depending from the selected output
interval (0-20 or 4-20 mA respectively).
TEMPERATURE COMPENSATION (HI9910 & HI9911 only)
•
Manual Temperature Compensation:
move the selector switch
to the MTC position, then manually set the temperature by turning
the MTC knob to the correct working temperature.
•
Automatic Temperature Compensation:
move the selector switch
to the ATC position, then wire a Pt100 probe, such as
HI7610
to
the proper terminals as indicated.
