Hanna Instruments wm 8910 User Manual

9

8

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