Hanna-instruments HI 8614N Manual do Utilizador descarregar pdf (Página 5)

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pH CALIBRATION WITH AUTOMATICpH CALIBRATION WITH AUTOMATIC

pH CALIBRATION WITH AUTOMATIC

TEMPERATURE COMPENSATION (HI 8614 family)TEMPERATURE COMPENSATION (HI 8614 family)

TEMPERATURE COMPENSATION (HI 8614 family)

INITIAL PREPARATION

• Connect the pH electrode to the

BNC socket.

• Connect the temperature probe to

the transmitter.

Pour small quantities of pH7.01 and pH4.01 solution into two

clean beakers.

For accurate calibration use two beakers for each buffer solution, the

first one for rinsing the electrode, the second one for calibration. In

this way contamination of the buffers is minimized.

To get accurate readings, use pH7.01 and pH4.01 if you are going

to measure acid samples or pH 7.01 and pH 10.01 for alkaline

measurements.

Note: With HI 8614L the instruments

display can be used during

calibration without the need to

connect the ammeter and the

reading is directly expressed in

pH units.

The wire between the transmitter and the recorder/indicator/controller

should be a PVC insulated two wire with a wire diameter of at least

0.7 mm. This wire is fed through one of the smaller cable glands. The

maximum distance between the power supply and the amplifier is

300 m (1000'). It is not necessary to use shielded cable. The

transmitter is protected against inversion of supply voltage.

Electrode connection: connect the BNC

of the cable to the BNC socket on the

transmitter.

For HI 8614 family only: for automatic

temperature compensation, connect

the 2 terminals of the temperature probe

(HI 76608, optional) to "TEMP. PROBE"

terminals.

If automatic temperature compensation

is not required, short the "TEMP. PROBE"

terminals with a resistance according to

the external temperature:

Temperature (°C) Resistance (Ohms)

0 1634

10 1774

20 1922

30 2078

40 2242

50 2412

60 2590

A 2 kohm resistor is factory mounted for 25°C temperature compensation.

1 2 3 4 5 6 7 8 9 10 ... 16 17

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