Hanna Instruments wm 8910 User Manual
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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
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.
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.
activated when the pH varies by more than ±2.0 pH from
the setpoint or the ORP by ±200 mV.
FUNCTIONAL DESCRIPTION WM 8912
FUNCTIONAL DESCRIPTION WM 8912
FUNCTIONAL DESCRIPTION WM 8912
FUNCTIONAL DESCRIPTION WM 8912
FUNCTIONAL DESCRIPTION WM 8912
pH
pH
pH
pH
pH & ORP CONTROLLER
& ORP CONTROLLER
& ORP CONTROLLER
& ORP CONTROLLER
& ORP CONTROLLER
Unplug the instrument from the power supply before
replacing the fuse.
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
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