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pH/mV TRANSMITTER

Fig.1

Active transmitter.

Fig.3

Passive transmitter.

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Fig.4

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Fig.2

Active indicator.

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The

DO 9403T-R1

pH transmitter converts the output of a pH electrode, with

temperature compensation, into a signal at 4÷20 mA. The pH or Redox electrode

input circuit is galvanically insulated against the 4÷20 mA output signal.

An LCD indicator allows viewing of the process signal value and of the various

parameters. The accurate design and choice of components make the instrument

precise and reliable for a long working life.

The instrument works in conjunction with a pH or Redox electrode and a

temperature probe (Pt100 sensor, 100

at 0°C).

Key functions

PRG

Programming of the parameters is activated by pressing the PRG key.

The

symbol lights up on the display and the message P1 appears,

indicating that the parameter P1 is being programmed. When the PRG

key is pressed continuously, the messages P2, P3, P4, P5, P6, P7, P8,

P9, P10 and the corresponding parameters are displayed in sequence.

After P10 the instrument returns to normal function.

After the parameter concerned gas been displayed, it is possible to view

its value by pressing the OK key. To change the parameter use the s and

t keys. Press the OK key again to confirm the value of the parameter.

SET

Key for setting the relay intervention threshold. The

symbol and the

REL symbol appear on the display, fixed or flashing, indicating the

switching on or off threshold of relay A or of relay B.

°C/°F

- If this key is pressed it changes the temperature measuring unit to

degrees Celsius or degrees Fahrenheit.

When pressed together with the CAL key it activates the manual

temperature setting function.

If pressed during the pH calibration function it quits the calibration

function without storing the calibration.

pH/mV

- If this key is pressed it changes the measuring unit to mV or pH.

When pressed together with the CAL key it activates the pH calibration

function.

Confirms the programming parameters, or the relay SET values, and

stores them.

CAL

- When pressed together with the °C/°F key it activates the manual

temperature setting function.

When pressed together with the pH/mV key it activates the pH

calibration function.

Key used to confirm pH calibration and manual temperature setting.

▲

- Key for increasing the value displayed in the parameter programming

phase.

During the relay SET point programming phase.

During the calibration phase.

▼

- Key for decreasing the value displayed in the parameter programming

phase.

During the relay SET point programming phase.

During the calibration phase.

Setting the relay SET point

Press the SET button; the

symbol appears on the display.

The REL symbol and the letter A also light up on the display to indicate that the

value shown corresponds to the switching on threshold of relay A.

To change this value press the

▲

and

▼

keys.

Press SET; the REL symbol flashes and the letter A remains lit to indicate that

the value shown corresponds to the switching off threshold of relay A.

To change this value press the

▲

and

▼

keys.

Press the SET button; the REL symbol and the letter B light up to indicate that

the value shown corresponds to the switching off threshold of relay B.

To change this value press the

▲

and

▼

keys.

Press SET; the REL symbol flashes and the letter B remains lit to indicate that

the value shown corresponds to the switching off threshold of relay B.

To change this value press the

▲

and

▼

keys.

Press SET, the instrument stores the set parameters and returns to normal

function. The REL and

symbols disappear.

NOTE: During the SET point setting phase (REL symbol lit or flashing) the

instrument returns to normal function if no key is pressed for 2 minutes.

PH-2

PH-3

Содержание DO 9403T-R1

Страница 1: ...DO 9403T R1 PH 2 ...

Страница 2: ...function without storing the calibration pH mV If this key is pressed it changes the measuring unit to mV or pH When pressed together with the CAL key it activates the pH calibration function OK Confirms the programming parameters or the relay SET values and stores them CAL When pressed together with the C F key it activates the manual temperature setting function When pressed together with the pH...

Страница 3: ...it can only be displayed NOTE P6 P7 P8 P9 calibration procedure to be carried out at a laboratory by skilled workers Pt100 probe calibration 100 Ω at 0 C Connect the Pt100 probe to the instrument Press the PRG key until the message P6 appears on the display Press the OK key the currently measured temperature appears on the display Immerse the Pt100 probe and a precision thermometer for reference i...

Страница 4: ...s that the manual compensation temperature is being changed indicates that the pH electrode is being calibrated Error signals OFL Warning which appears during measurement when the value to be displayed is out of scale E1 Error warning which appears during pH calibration to indicate that the offset value of the electrode is too high in absolute value E2 Error warning which appears during pH calibra...

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