User Guide

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BOTTOM CONNECTIONS

1. BNC socket for a combination pH electrode

2. DIN socket (7-pin) for HI 7637

conductivity probe with ATC

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 conductivity control (closed when the

conductivity is higher than setpoint)

FRONT PANEL

Left panel

1. LCD display for pH measurements

2. Graded dial for setting the pH setpoint (4.00 to 10.00 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 conductivity measurements

6. Graded dial for conductivity setpoint (0.50 to 3.00 mS/cm)

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

8. Offset (0 mS) and Slope (5.0 mS) calibration trimmers

Right panel

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

(NC) or a normally open (NO) position (activated when the

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

FUNCTIONAL DESCRIPTION WM 8913FUNCTIONAL DESCRIPTION WM 8913

FUNCTIONAL DESCRIPTION WM 8913

pH pH

& CONDUCTIVITY CONTROLLER& CONDUCTIVITY CONTROLLER

& CONDUCTIVITY CONTROLLER

Unplug the instrument from the power supply before

replacing the fuse.

Specifications WM 8913D WM 8913U

RANGE 0.00 to 14.00 pH and 0.00 to 19.99 mS/cm

RESOLUTION 0.01 pH and 0.01 mS/cm

ACCURACY ±0.02 pH and ±2% Full Scale

(@20°C/68°F)

TYPICAL EMC ±0.1 pH

DEVIATION ±2% Full Scale

CALIBRATION 2 point for each pH and conductivity

SETPOINT RANGE pH: 4.00 to 10.00; Conductivity: 0.50 to 3.00 mS/cm

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 ±2.0 pH or conductivity

by ±0.5 mS/cm from the setpoints.

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

POWER SUPPLIES One plug for the pH (acid) and another for conductivity

FOR DOSING control (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 142 mm (7.1 x 8.7 x 5.6")

MATERIAL Housed in rugged, fiber-reinforced polypropylene case