Rear panel
1. Trimmer for overtime setting
(typically from 5 to 30 min)
2. Jumper for enabling (jumper-
in) or disabling (jumper-
removed) the overtime control
3. Not Used contact
4. This contact acts as a switch
for driving the dosing system
(e.g. dosing pump)
5. Power supply terminal
6. Not Used contact
7. BNC plug for pH electrode
8. Connection for electrode
reference
9. Connection for potential
Matching Pin
10. Acid/Alkaline dosage selection
terminal:
•contact open = acid selection
•contact closed = alkaline
selection
11. Not Used contact
OPERATIONS
Overtime system: jumper (1) and
trimmer (2)
• This system allows the user to set
a maximum dosing period, by
adjusting the rear trimmer from 5
(min) to approx. 30 (max) minutes.
• When the set time is exceeded,
any dosing action stops, the LED
indicator on the front panel will
blink Red and the Yellow LED
indicator start blinking. To exit the
overtime condition, set the
OFF/Auto/ON switch to OFF
position, and then to Auto again.
For disabling the overtime feature,
simply remove the jumper from the
rear panel.
Note: The overtime system works
only if the OFF/Auto/ON switch is
in Auto position.
Terminals (7) and (8): Electrode
• Connect a pH-electrode to the
meter’s BNC plug (7).
• To benefit from the differential
input, connect the proper electrode
wire (if available) or a cable with a
potential matching pin (grounding
bar) to the relevant terminal (9)on
the rear panel.
Note: When the Matching Pin
cannot be immersed together with
the pH electrode in the solution,
disable the differential input by
shorting terminals (9) (Matching
Pin) and (8) (Electrode Reference)
with a jumper wire.
Terminals (10): Dosing selection
• For acid dosage, leave the circuit
open.
• For alkaline dosage, short the
terminals with a jumper wire.
Terminals (3) & (6) & (11): Not
Used
Terminals (5): Power Supply
• connect power supply with
220/230 V ac & 50,60 Hz
Terminals (4): Dosing Contact
• This contact drives the dosing
system according to the selected
set point and dosing direction:
• if “Acid” dosage is set, the relay
is ON and dosing activated if
measured value is higher than set
point;
• if “Alk” dosage is set, the relay is
ON and dosing activated if
measured value is lower than set
point.
OPERATING THE METER
Before proceeding make sure that:
• the meter is calibrated;
• the set point value has been
properly adjusted;
• all rear panel wiring and
selections are correct;
• the OFF/Auto/ON switch is in the
desired position.
Install or immerse the electrode in
the solution to be monitored, then
press the Measure key (if
necessary).
The LCD will show the pH value.
The LED indicator will light up
Green when the meter is in
measurement mode and
dosing is not active, while it will
light up Orange for signaling that a
dosing action is in progress.
SETPOINT
Press the SET Point key: the
display will show the default or
previously adjusted value and the
Green LED start blinking as
indication. Using a small
screwdriver as provided adjust the
SET trimmer until the desired set
point value is displayed.
After 1 minute the meter
automatically returns to the normal
mode; if not, press the Measure
key.
Warranty:
These instruments are guaranteed
for two years against defects in
workmanship and materials when
used for their intended purpose and
maintained according to
instructions.
Electrodes and probes are
guaranteed for six months. This
warranty is limited to repair or
replacement free of charge.
Damages due to accidents, misuse,
tampering or lack of prescribed
maintenance are not covered. If
service is required, contact the
dealer from whom you purchased
the instrument. If under warranty,
report the model number, date of
purchase, serial number and the
nature of the problem. If the repair
is not covered by the warranty, you
will be notified of the charges
incurred. When shipping any
instrument, make sure it is
properly packaged for complete
protection.
