Hanna Instruments wm 8910 User Manual

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10. Output contacts:

– Two terminals marked "°C Sensor" for the connection of a

temperature probe for automatic temperature compensa-
tion

– Two terminals marked "mA Output" for the isolated output

BOTTOM CONNECTIONS

1. BNC socket for a combination pH electrode
2. Input voltage supply socket
3. Output voltage socket for acid dosing (supplies power to a

pump or electrovalve). This socket is activated by a relay
when the pH is higher than the "SET HI" value.

4. Output voltage socket for alkaline dosing (supplies power to a

pump or electrovalve). This socket is activated by a relay
when the pH value is lower than the "SET LO" value.

Unplug the instrument from the power supply before
replacing the fuse.

Specifications

WM 8911D

WM 8911U

RANGE

0.00 to 14.00 pH

RESOLUTION

0.01 pH

ACCURACY

±0.02 pH

(@20°C/68°F)
TYPICAL EMC

±0.1 pH

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 RANGE

From 0.00 to 14.00 pH with 2 trimmers:

"COARSE" for an approximate

regulation, "FINE" for fine tuning.

ALARM CONTACT

Through a relay which provides a normally open

or a 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 -2.0 pH from "SET LO" and

+2.0 pH from "SET HI" points.

POWER SUPPLY

220/240V

110/115V

50/60Hz

POWER SUPPLIES

One plug for acid and another for alkaline dosage

FOR DOSING

(115 or 220V, 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