Hanna Instruments hi 7871 Manual Do Utilizador

• With HI 7873, connect terminals #10 and #11 to an

alarm for monitoring Over Flow condition.

• Remove the cover of HI 7874 (bar holder) and connect

a 2-wire cable from #8 to positive (+) and #9 to
negative (–) terminals of the holder.

The common terminal (#4) and #3 can also be
connected to a device to indicate a “full tank” state.

• Screw the longest bar to the hole

marked as COMM. This bar will be
used as the reference electrode. Screw
the other measuring bars into the
remaining sockets in any order. The
bars should be cut to the required
lengths for low, high and over. The
reference (COM) and the low bar
(1

) can be the same length.

• With HI 7871, connect only 3 bars

to the holder: reference, low and
high. With HI 7873, connect 4 bars
to the holder: reference, low, high
and over.

SPECIFICATIONS

HI 7871

HI 7873

Level Adjustment

High, Low

High, Low, Over

Level Indication

High, Low

High, Low, Over

Transmission

300 m (990') max

Socket/Connector

11-pin connector

Sensing Bars*

Transmitter*

HI 7874

Output Contact

One, 2A/220V

Two, 2A/220V

relay for up to

relays for up to

1,000,000 closures 1,000,000 closures

Power Supply

110/115V or 220/240V –50/60 Hz

Environment

0 to 50°C (32 to 122°F)

Max. 85% RH non-condensing

Dimensions

79 x 49 x 95 mm (3.1 x 1.9 x 3.7")

Weight

130 g (4.6 oz.)

CONNECTIONS

• Remove the 11-pin connector from the rear of the level

controller.

• Connect a 2-wire power cable to terminals #2 and #7

(no ground connection).

• Connect the output terminals #4 (common) and #5

(low) to a relay switch (max 2A/220V) to start and stop
a pump or to open and close an electrovalve. These two
contacts act only as a switch and the pump or electrovalve
have to be powered independently.

* Not included with HI 7871/7873.