User Guide

ManualsBrandsHanna Instruments ManualsOtherWM 8910

FRONT PANEL

Left panel

1. LCD display

2. Fine and Coarse trimmers to precisely set the lower level

3. Fine and Coarse trimmers to precisely set the higher level

4. Offset and Slope calibration trimmers

5. Selects actual measurement (MEASURE) or setpoint (SET) to

be displayed on the LCD

6. Selects "LO" and "HI" setting modes

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

“SET LO” and +2.0 from “SET HI” setpoint values.

9. Control contacts:

– Three terminals marked "Temperature Compensation Select"

to select automatic or manual temperature compensation

mode

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

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

Specifications WM 8910D WM 8910U

RANGE 0.00 to 14.00 pH

RESOLUTION 0.01 pH

ACCURACY ±0.02 pH

(@20°C/68°F)

TYPICAL EMC ±0.1pH

DEVIATION

mA OUTPUT User selectable 0 to 20 mA or 4 to 20 mA

in a 0-14 pH range with isolated output

OFFSET Through "OFFSET" trimmer

CALIBRATION (Max. ±1.5 pH regulation)

SLOPE Through "SLOPE" trimmer

CALIBRATION from 80% to 110%

TEMPERATURE Manual or automatic

COMPENSATION from -10 to 80°C (14 to 176°F)

SETPOINT From 0.00 to 14.00 pH with 2 trimmers: "COARSE" for

RANGE an approximate regulation and "FINE" for fine tuning.

In addition, setpoint controls are activated through the

"CONTROL SELECT" terminals: "ACID"

or "BASE" for acid or basic dosage.

ALARM Through a relay which provides a normally open or a

CONTACT normally closed contact output (isolated output Max.

2A, Max. 240V, resistive load, 1,000,000 strokes).

The alarm contact will be activated if the pH

varies by more than ±2 pH from setpoint.

POWER SUPPLY 220/240V 110/115V

50/60Hz 50/60Hz

POWER SUPPLY One plug for the pH dosage (115 or 220V, depending

FOR DOSING 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

FUNCTIONAL DESCRIPTION WM 8911FUNCTIONAL DESCRIPTION WM 8911

FUNCTIONAL DESCRIPTION WM 8911

DUAL SETPOINT, DUAL SETPOINT,

DUAL SETPOINT,

pHpH

CONTROLLER CONTROLLER

CONTROLLER