REAR PANEL CONNECTIONS
Terminals #1: Probe
• Connect the
HI 7634-00
probe by following the wires
colour indications.
Terminals #2: Power Supply
• Model
BL983320-0:
connect the 2 wires of a 12 Vdc
power adapter to the ter12 Vdc and GND.
• Model
BL983320-1:
connect a 3-wire power cable to the
terminals while paying attention to the correct earth (PE),
line (L) and neutral (N1 for 115 V or N2 for 230 V) contacts.
Terminals #3: Dosing Contact
• This contact drives the dosing system, accordingly to the
selected setpoint.
Note
: The setpoint has a typical hysteresis value comparable
to the meter accuracy.
Terminals #4: Not Used Contact
Overtime system: jumper (#5) and trimmer (#6)
• 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
LCD will show the “TIMEOUT” warning message. 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 on the rear panel.
Note:
The overtime system works only if the OFF/Auto/ON
switch is in “Auto” position.
OPERATING THE METER
Before proceeding make sure that:
• the meter has been calibrated;
• the setpoint value has been properly adjusted;
• all rear panel wiring and selections are correct;
• the Auto/OFF/ON switch is in the desired position.
Install or immerse the probe in the solution to be monitored,
then press the “MEAS” key (if necessary).
The LCD will show the EC (µS/cm) value. The LED indicator
will light up Green when the meter is in measurement mode
and dosing is not active, while will light up Orange/Yellow for
signaling that a dosing action is in progress.
FUNCTIONAL DESCRIPTION
Front panel
Rear panel
1. Connections for EC probe
2. Power supply terminal:
• for
BL983320-0
model: 12 Vdc adapter
• for
BL983320-1
model: 115 Vac or 230 Vac option
3. This contact acts as a switch for driving the dosing system (e.g.
dosing pump)
4. Not used contact
5. Jumper for enabling (jumper in) or disabling (jumper
removed) the overtime control
6. Trimmer for overtime setting (typically from 5 to 30 minutes)
1. Liquid Crystal Display
2. Switch for selecting dosing mode:
• OFF = dosing disabled
• Auto = automatic dosage, depending on setpoint value
• ON = dosing always active
3. “MEAS” key to set the instrument to measurement mode
4. “SET” key to display and set the setpoint value
5. “SET” trimmer to adjust the setpoint value
6. “CAL” trimmer
7. 3-colour LED indicator:
• Green = meter in measurement mode
• Orange/Yellow = dosing in progress
• Red, blinking = indicates an alarm condition
OPERATIONS
CALIBRATION
To calibrate the meter, proceed as follows:
• ensure the meter is in measurement mode;
• immerse the probe in
HI 7033
calibration solution (84
µS/cm);
• shake briefly and wait for reading to stabilize;
• adjust the “CAL” trimmer to read “84.0 µS” on the LCD.
SETPOINT
Press the “SET” key: the display will show the default or
previously adjusted value, together with the “SET” indication.
Using a small screwdriver adjust the “SET” trimmer until the
desired setpoint value is displayed.
After 1 minute the meter automatically returns to the normal
mode; or press the “MEAS” key.
PROBE MAINTENANCE
To improve the probe performance and prolong its life, it is
recommended to clean it regularly.
• Immerse the tip of the probe in
HI 7061
Cleaning
Solution at least for one hour.
• If a more thorough cleaning is required, brush the metal
pins with very fine sandpaper.
• After cleaning, rinse the probe with tap water and
recalibrate the meter.
• When not in use, clean the probe before storing it.
ISTBL3320R3 04/05
All external cables connected to the rear panel
should end with cable lugs.
A circuit breaker (rated 6A max.) must be
connected in close proximity to the equip-
ment, and in a position easy to reach by the
operator, for disconnection of the instrument
and of all the devices connected to the relays.
