Hanna Instruments wm 8910 User Manual

7

6

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

0 to 20 mA or 4 to 20 mA isolated output.

10. Output contacts:

– Two terminals marked "°C Sensor" for the connection of a

silicon temperature probe for automatic temperature
compensation

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

BOTTOM CONNECTIONS

1. BNC socket for a combination pH electrode
2. Input voltage supply socket
3. Output voltage socket (supplies power to a pump or

electrovalve). This socket is activated by a relay when the pH
has not reached the setpoint.

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

FRONT PANEL

Left panel

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

be displayed on the LCD

7. Graded dial for manual temperature compensation

Right panel

8. 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 pH varies by more than ±2.0 pH from
the setpoint.

9. Control contacts:

– Three terminals marked "Control Select" to choose acid or

basic dosing

– Three terminals marked "Temperature Compensation Select"

to select automatic (ATC) or manual temperature
compensation mode (MTC)