User Guide

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OPERATIONAL GUIDEOPERATIONAL GUIDE
OPERATIONAL GUIDEOPERATIONAL GUIDE
OPERATIONAL GUIDE
ELECTRICAL & PROBE CONNECTIONS
• Connect the power cable (HI 767/P) to the input voltage supply
socket on the bottom of the meter (see functional description).
• Connect the pH or/and ORP electrode(s) to the BNC socket(s)
provided (for WM 8912 only, the BNC for the pH electrode is on
the left and the BNC for the ORP one on the right) and located
on the bottom of the meter.
• Connect the HI 7637 conductivity probe to the
DIN socket (for WM 8913, WM 8923 and WM 8930)
located on the bottom of the meter, by aligning the
pins with the socket, pushing the plug in and
tightening the threaded ring.
• Connect the external device/s (a pump or an electrovalve) through
HI 7671 output plug to the output socket/s (just one for
WM 8910, WM 8920 and WM 8930 or two for WM 8911,
WM 8912, WM 8913, WM 8923) located on the bottom of the
meter. The selected operation will be activated by the gauge
relay/s (see page 31 for more information).
ALARM & RECORDER CONNECTIONS
• If the reading drifts from the setpoint as specified on the next
page or if the unit loses power an external alarm is activated. It
can be selected normally closed ("NC") by connecting the external
device to the C and NC terminals or normally open ("NO") by
connecting the external device to the C and NO terminals.
Specifications WM 8930D WM 8930U
RANGE 0 to 10,000 µS/cm
RESOLUTION 1 µS/cm
ACCURACY ±2% Full Scale
(@20°C/68°F)
TYPICAL EMC ±2% Full Scale
DEVIATION
mA OUTPUT User selectable 0 to 20 mA or 4 to 20 mA in
a 0 to 10000 µS/cm range with isolated output
CALIBRATION 2 point through trimmers on the front panel
TEMPERATURE Automatic with ß of 2% per °C
COMPENSATION
SETPOINT RANGE From 0 to 10,000 µS/cm with 2 trimmers: "COARSE" for
an approximate regulation and "FINE" for fine tuning.
In addition, setpoint contacts are activated through the
"CONTROL SELECT" terminals: "HI" or "LO" for increasing
or reducing the conductivity.
ALARM CONTACT Through a relay which provides a normally open or a
normally closed contact output (isolated output Max.2A,
Max.240V, resistive load, 1,000,000 strokes). The alarm
contact activates when the conductivity value varies by
more than ±500 µS/cm from setpoint.
POWER SUPPLY 220/240V 110/115V
50/60Hz 50/60Hz
POWER SUPPLIES One plug for the high or low conductivity
FOR DOSING dosage (115 or 220V, depending on
the model, Max.2A, 1,000,000 strokes)
ENVIRONMENT -10 to 50°C (14 to 122°F)
max 85% RH non-condensing
PROTECTION IP54
WEIGHT 1.6 Kg (3.5 lb.)
ENCLOSURE 181 x 221 x 142mm (7.1 x 8.7 x 5.6")
MATERIAL Housed in rugged, fiber-reinforced polypropylene case