User Guide

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BOTTOM CONNECTIONS

1. BNC socket for a combination pH electrode

2. BNC socket for a combination ORP electrode

3. Input voltage supply socket

4. Output voltage socket for pH dosing (activated by a relay

when pH is higher than setpoint)

5. Output voltage socket for ORP dosing (activated by a relay

when ORP is lower than setpoint)

FRONT PANEL

Left panel

1. LCD display for pH measurements

2. Graded dial for setting the pH setpoint (6.00 to 8.00 pH)

3. LED that lights up when the pH dosage is activated.

4. Offset (pH 7) and Slope (pH 4) calibration trimmers

5. LCD display for ORP measurements

6. Graded dial for setting the ORP setpoint (500 to 900 mV)

7. LED that lights up when the ORP dosage is activated.

Note: When both the LEDs are lit up simultaneously, pH takes

priority over ORP dosage.

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 or the ORP by ±200 mV.

FUNCTIONAL DESCRIPTION WM 8912FUNCTIONAL DESCRIPTION WM 8912

FUNCTIONAL DESCRIPTION WM 8912

pHpH

& ORP CONTROLLER & ORP CONTROLLER

& ORP CONTROLLER

Unplug the instrument from the power supply before

replacing the fuse.

Specifications WM 8912D WM 8912U

RANGE 0.00 to 14.00 pH and -1000 to +1000 mV

RESOLUTION 0.01 pH and 1 mV

ACCURACY ±0.02 pH and ±5 mV

(@20°C/68°F)

TYPICAL EMC ±0.1pH

DEVIATION ±6 mV

pH CALIBRATION 2 point through "pH 7" and

"pH 4" trimmers on the front panel

SETPOINT RANGE pH : from 6.00 to 8.00; ORP: from 500 to 900 mV

ALARM CONTACTS Normally open or normally closed isolated

outputs (Max.2A, Max.240V, resistive load, 1,000,000

strokes). Activated if the pH varies by ±2 pH or the

ORP by ±200 mV from setpoints.

POWER SUPPLY 220/240V – 50/60Hz 110/115V – 50/60Hz

POWER SUPPLIES One plug for acid and another for oxidizing

FOR DOSING dosage (115 or 220V, 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