Hanna Instruments wm 8910 User Manual

2 1

2 0

Unplug the instrument from the power supply before
replacing the fuse.

BOTTOM CONNECTIONS

1. DIN socket for HI 7637     conductivity probe

2. Input voltage supply socket
3. Output voltage socket. This socket is activated by a relay

when the measured reading is higher or lower than the
setpoint depending on the HI/LO selection.

FRONT PANEL

Left panel

1. LCD display
2. Slope calibration trimmer
3. Coarse trimmer to adjust the setpoint
4. Fine trimmer to precisely adjust the set-point
5. Offset  calibration trimmer
6. Selects actual measurement (MEASURE) or setpoint (SET) to

be displayed on the LCD

Right panel

7. Triple contact alarm to select the alarm in a normally closed

(NC) or a normally open (NO) position. The alarm contact is
activated when the conductivity varies by more than
±500 µS/cm from the setpoint.

8. Control contacts:

– Three terminals marked "Control Select" to select HI or

LOW for dosing selection

– Three terminals marked "Out mA Select" to select between

0 to 20 mA or 4 to 20 mA isolated output

9. Output contacts:

– Two terminals marked "mA Output" for the isolated output