Gefran TKDA series Manuel utilisateur

INDUSTRIAL PRESSURE TRANSMITTER

TKDA/TPSADA series

OPERATING MANUAL

DIGITAL AUTOZERO & SPAN OPTION

code 85189 ed. 01 - 01/07

This section contains information and warnings of a

general nature which should be read before proceeding

with any function activation

The transmitter remains on the std operating mode, till an

external event happens.

The possible channels to activate the additional functions

are the following:

- CAL pin

- Magnetic pen

The operating manual explains the following features:

1) Autozero

2) Fine-Autozero

3) Calibration

4) Autospan

5) Partial Reset

6) Total Reset

CAL pin: activation of CAL function (Calibration, Autospan)

is made by closing the contact between the following pin:

• 6 pole connector version (V) pin E-F

• 7 pole connector version (P) pin 5-6

The following pages explain the application modality, for all

the additional functions.

The contents are related to application limits and aims.

1) AUTOZERO

Application mode Limits Result

The Autozero function is activated by :

1) positioning the magnet near the

Autozero label on the shell of the

sensor.

The magnet has to be maintained on

the Autozero position for a time within

1 to 10 sec.

The whole Zero unbalancement in

addition to the zero done by the

manufacturer, has to be within ± 10%

FS.

The Autozero effect will be visible

after waiting 2 sec from the release of

the magnetic pen.

The precision of the zero value will be

within the accuracy class of the sen-

sor.

The Autozero function doesn’t work

outside the defined limits.

NOTE:

During the Autozero phase, the output for current transmitter series, will increase around 7mA.

That’s a short variation only visible during the Autozero phase; it won’t have any effects on the final result.

Figure 1 : represents the “magnetic pen"

Figure 2 : represent the Autozero function label

on the sensor housing

Figure 3 : shows the position of the pen on the

shell while activating the autozero

function

Figure 1 Figure 2 Figure 3

85189_MAN_TKDA-TPSADA_0107_ENG

2) FINE-AUTOZERO FUNCTION

Application mode Limits Result

The Fine-Autozero function is activa-

ted by :

1) positioning the magnet near the

Autozero label on the shell of the

sensor.

2) The magnet has to be maintained

on the Autozero position for a time

within 10 to 30 sec.

After removing the magnet the

signal will start changing the value

step by step.

Stop adjustment:

Touch the Autozero area with the

magnet to stop the signal scrolling.

The whole Zero unbalancement in

addition to the zero done by the

manufacturer, has to be within

± 10%FS

The output signal will change within a

± 100mV value (± 0.16mA for 4 to

20mA output) in steps of 6mV ( 12µA

for 4 to 20mA output).

Eg:

0..-6..-12..//-100..+100..+94..+88..0

When the desired zero value is rea-

ched stop the adjustment cycle by

touching the Autozero area with the

magnet.

The Fine-Autozero function doesn’t

work outside the defined limits.

NOTE:

- The step duration time is 5 sec

- During the Autozero phase, the output for current transmitter series, will increase to around 7mA.

Furthermore between the step variations it will be possible to have short overcurrent up to 7mA.

- That’s an immediate variation only visible during the Autozero phase; it won’t have any effects on the final result.

- The new zero value setted with the “Fine-Autozero” function, will be the zero reference for future “Autozero” procedures.

3) CALIBRATION

Application mode Limits Result

Start calibration

The Calibration function is

activated by short-circuiting the

CAL pin for a minimum time of

1 sec

Stop calibration

Release the CAL pin short-circuit

The whole Zero unbalancement in

addition to the zero done by the

manufacturer, has to be within

± 20%FS.

During the Calibration phase the

signal will be unbalanced at 80% FS.

The calibration effect is visible 2 sec

after short-circuiting CAL pin.

The Calibration function doesn’t work

outside the defined limits.

NOTE:

- Switching off the supply while the calibration function is activated, could be cause of calibration problems; the

transmitter can be restored to the initial value by activating the “partial reset function”.

- To locate the CAL pin contacts, please refer to item “CAL pin” at the beginning of this manual.

285189_MAN_TKDA-TPSADA_0107_ENG

4) AUTOSPAN

Application mode Limits Result

The Autospan function is activated in

three steps as explained in the

following.

Phase 1) pressure = 0 bar:

1° Autozero

Activate the Autozero function

Phase 2) pressure = FS ***:

Short-circuit CAL pin.

Maintain the short-circuit,

after a minimum time of 1 sec.,

start the “Autozero function”; the

magnet has to be maintained in

contact for a period of 1 - 10sec.

Than release the short-circuit,

after a minimum time of 1 sec.

Phase 3) pressure = 0 bar:

2° Autozero

Activate the Autozero function

The whole Zero unbalancement in

addition to the zero done by the

manufacturer, has to be within

± 10%FS

The whole span unbalancement

which can be obtained must be within

± 5% of the FS of the transmitter

The transmitter will be calibrated at

the new Zero and Span values, within

the accuracy class of the sensor.**

The Autozero function doesn’t work

outside the defined limits.

NOTE:

**: It is possible improve the calibration precision by doing several calibration runs (Autospan function).

***: The FS has to be a pressure value within ± 5 %FS

- To locate the CAL pin contacts, please refer to item “CAL pin” at the beginning of this manual.

5) PARTIAL RESET OF THE CALIBRATION VALUES

Application mode Limits Result

The partial reset function is activated

by positioning the magnet near the

Autozero label on the shell of the

sensor.

The magnet has to be maintained on

the Autozero position for a time within

30 to 60 sec.

The Zero of the transmitter will be

restored to the factory settings; fur-

thermore an Autozero will be done

automatically.

The Span calibration will not be affec-

ted.

NOTE:

- During the partial reset phase, the output for current transmitter series, will increase around 7mA

6) TOTAL RESET OF THE CALIBRATION VALUES

Application mode Limits Result

The total reset function is activated by

positioning the magnet near the

Autozero label on the shell of the

sensor.

The magnet has to be maintained on

the Autozero position for a time over

60 sec

The Zero and Span of the transmitter

will be restored to the factory

settings.

NOTE:

- During the total reset phase, the output for current transmitter series, will increase around 7mA

85189_MAN_TKDA-TPSADA_0107_ENG

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