Hanna Instruments wm 8910 User Manual
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FRONT PANEL
Left panel
1. LCD display
2. Slope calibration trimmer
3. Coarse set point trimmer
4. Fine set point trimmer
5. Offset calibration trimmer
6. Selects actual measurement (MEASURE) or setpoint (SET) to
2. Slope calibration trimmer
3. Coarse set point trimmer
4. Fine set point trimmer
5. Offset calibration trimmer
6. Selects actual measurement (MEASURE) or setpoint (SET) to
be displayed on the LCD
Right panel
7. 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 mV varies by more than ±200 mV from
the setpoint.
activated when the mV varies by more than ±200 mV from
the setpoint.
8. Control contacts:
– Three terminals marked "Control Select" to choose REDOX or
OXYDT for dosing reducing or oxidant chemicals
– Three terminals marked "Out mA Select" to select between
0 to 20 mA or 4 to 20 mA isolated output.
9. Output contacts:
– Two terminals marked "mA Output" for the isolated output
FUNCTIONAL DESCRIPTION WM 8920
FUNCTIONAL DESCRIPTION WM 8920
FUNCTIONAL DESCRIPTION WM 8920
FUNCTIONAL DESCRIPTION WM 8920
FUNCTIONAL DESCRIPTION WM 8920
SINGLE SETPOINT ORP CONTROLLER
SINGLE SETPOINT ORP CONTROLLER
SINGLE SETPOINT ORP CONTROLLER
SINGLE SETPOINT ORP CONTROLLER
SINGLE SETPOINT ORP CONTROLLER
Unplug the instrument from the power supply before
replacing the fuse.
replacing the fuse.
BOTTOM CONNECTIONS
1. BNC socket for a combination ORP electrode
2. Input voltage supply socket
3. Output voltage socket (activated by a relay when the
2. Input voltage supply socket
3. Output voltage socket (activated by a relay when the
measured reading is higher or lower than the setpoint
depending on the REDOX/OXYDT selection)
depending on the REDOX/OXYDT selection)
Specifications
WM 8920D
WM 8920U
RANGE
-1000 to 1000 mV
RESOLUTION
1 mV
ACCURACY
±5 mV
(@20°C/68°F)
TYPICAL EMC
TYPICAL EMC
±6 mV
DEVIATION
mA OUTPUT
mA OUTPUT
User selectable 0 to 20 mA or 4 to 20 mA in
a -1000 to 1000 mV range with isolated output
CALIBRATION
2 point through trimmers
SETPOINT RANGE
From -1000 to 1000 mV with 2 trimmers: "COARSE" and
"FINE" (activated through the "CONTROL SELECT" terminals:
"OXYDT" or "REDOX" for the oxidizing or reducing dosage)
ALARM CONTACT
Normally open or normally closed isolated outputs
(Max. 2A, Max. 240V, resistive load, 1,000,000 strokes)
(activated when the ORP value varies by
more than ±200 mV from setpoint)
POWER SUPPLY
220/240V – 50/60Hz
110/115V – 50/60Hz
POWER SUPPLIES
One plug for the oxidizing or reducing dosage (115 or 220V
FOR DOSING
depending 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