Hanna Instruments HI 931002 User Manual

Page 5

BATTERY REPLACEMENT

The instruments uses a 9 volt battery that lasts for approximately
1600 hours of continuous use.
When the battery is rundown, "V" and two
decimal points blink on the LCD to warn the
user.
Battery replacement must only take place in a non
hazardous area using the battery types specified in
this instruction manual (see page 4).
To change battery, slide the bottom back cover,
replace the old battery and replace the cover.

FUSE REPLACEMENT

The HI 931002 is equipped with a protection fuse inside the instru-
ment. In the event the fuse would break contact your nearest Hanna
Service.

The HI 931002 LCD will show the current from the transmitter in mA
or in pH units according to the relation:

4 mA = 0 pH
12 mA = 7 pH

mA = 1.14 x (pH reading) + 4

20 mA = 14 pH.

Press UNIT key to select the desired range. The read-

ing will toggle between the mA and pH reading.

mA - pH RELATION

ACTIVE MEASURING (TESTER) MODE

This mode is intended to test a passive transmitter. The HI 931002
supplies only the power to the 4-20 mA bus via an external connected
12-32 VDC power supply and displays the value of the current
produced by the transmitter.

• Turn the meter on by pressing the ON/OFF key.

• Select the measurement unit by pressing the UNIT

key.

• Switch the selection switch to the "Measure" mode.

• Connect the external power adapter to the power socket on the

right side of the HI931002.

• Wire the calibrator "Com." and "A" connectors to the Device Under

Test (D.U.T.) input contacts (see page 4, #10 and #8 respec-
tively) using the cables provided, paying attention to the polarity
("Com." to - and "A" to + terminals).

• Verify that the D.U.T. displays the same reading of the HI 931002

and calibrate the D.U.T. according to manufacturer instructions if
necessary.

IMPORTANT NOTE:

Set the selection switch to MEASURE mode only if the
D.U.T. is a transmitter and can limit current below 100mA.
WRONG OPERATION WILL BREAK THE INTERNAL FUSE.