Hanna Instruments hi 983321-0 Manual De Usuario

POWER CONNECTION

HI 983321-0
Connect a 2-wire power cable to the terminal strip while
paying attention to the correct positive and negative con-
tacts (12 VDC).

HI 983321-1
Connect a 3-wire power cable to the terminal strip while
paying attention to the correct earth, neutral and line
contacts (115/230 VAC).

Notes:
• All external cables connected to the rear panel should
   end with wire lugs.
• It is recommended to cover the unused terminals with
   insulating tape.
• At start up the meter needs a few seconds to stabilize.
   Wait until a stable reading is displayed.

ALARM CONTACT

Use this contact (maximum 5A, 240VAC, 30VDC) for connec-
tion to an alarm or dosing system. The unit acts as a switch
to control an external device.

OPERATING THE METER

All operations can be controlled via front panel keys and
trimmers.
“SET” and “MEAS” LEDs light up to indicate which is the
operating function.
Make sure that the meter is calibrated and the Setpoint is
properly selected  before performing any measurement.
Attach the probe to the meter. Install the probe in the
fittings or immerse it in the solution to be monitored, while
making sure that metal pins are completely submerged.

HI 7634-00 EC/TDS probe
HI 7061M Electrode cleaning solution, 230mL bottle
HI 710005 12 VDC power adapter, US plug
HI 710006 12 VDC power adapter, European plug
HI 710012 12 VDC power adapter, Australian plug
HI 710013 12 VDC power adapter, Southern Africa plug
HI 710014 12 VDC power adapter, UK plug
HI 731326 Calibration Screwdriver (20 pcs)
HI 740146 Mounting brackets

Side view of the
panel-mounted unit
Supplied adjustable lo-
cation brackets allow the
controller to slide into the
cutout and will hold the
unit securely in place. 95
mm (3.74") is the mini-
mum amount of space
required to install the
controller.

ON when LCD displays the set value
ON when LCD displays the measured value
ON when alarm contact is activated

    230 VAC
    115 VAC
    Neutral
    Protection Earth

the power input is internally protected by a 400 mA fuse

    This contact acts as a switch for the power.  The contact

has to be protected outside by the user.

3. Probe Connection: follow the above diagram and connect the
     colored wires of probe cable as indicated. It is recommended
    to connect the shield (P5) to avoid any interference.

Press the “MEAS” key.
The LCD will show the TDS value of the solution in ppm unit.
Any initial variation on readings may be due to tempera-
ture compensation.
The “ALARM” LED will light up when the alarm contact is
losed, to indicate an TDS value higher than selected
setpoint.

CALIBRATION

This meter is factory calibrated.
If re-calibration becomes necessary, a calibration solution
has to be prepared with the help of HI 9034 TDS-meter (or
similar). Recommended conductivity value of calibration solu-
tion should be around 13 ppm.
Make sure the meter is in the measurement mode (the
“MEAS” LED lights on).
Immerse the probe in the prepared solution.
Shake briefly and wait for reading to stabilize.
Using a small screwdriver adjust the calibration trimmer
until the meter displays the required TDS value on the LCD.

SETPOINT

Press the “SET” key. The display will show the default or
previously adjusted value for the setpoint.
Using a small screwdriver, adjust the “SET” trimmer until
the required limit value is displayed.

PROBE MAINTENANCE

To improve 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.