Yokogawa EJA440E Manuel d'utilisateur télécharger pdf (Page 23)

<3. Operation>

3-15

IM 01C25T03-01E

FEED NO OK

SET

J11:P ZERO ADJ

0.00000 kPa

CLRDEL ESC

SET

J11:P ZERO ADJ

0.00000 kPa

+ 0

A pressure of 0 kPa is applied.

Press the key twice

after the pressure has become

stable.

Zero adjustment is completed.

Press the (OK) key.

F0336.ai

Transmitter measures pressure of

0.03585 kPa.

Transmitter measures pressure of

0.00000 kPa.

A11:PRES

0.03585 kPa

A11:PRES

0.00000 kPa

a-2. Level Adjustment

The zero adjustment by the parameter J11: P ZERO

ADJ calibrates the transmitter output corresponding

to the actual tank level. To perform this adjustment,

rst use a glass gauge or the like to determine the

actual tank level, then enter the correct data as

shown below.

F0337.ai

25.00 kPa

0.00 kPa

Actual level

13.50 kPa

DPharp span: 0 to 25.00 kPa

Actual level: 13.50 kPa

Transmitter output: 13.83 kPa

DPharp

CLRDEL ESC

SET

J11:P ZERO ADJ

0.00000 kPa

+ 045.0

+ 13.5

Enter the present actual level,

13.5 kPa.

Press the key twice.

The measured pressure is

changed to 13.5 kPa.

F0338.ai

Transmitter measures present

pressure of 13.83 kPa.

A11:PRES

13.83 kPa

A11:PRES

13.5000 kPa

a-3. Using External Zero-adjustment Screw

This method permits zero adjustment without the

BT200. Use a slotted screwdriver to turn the zero-

adjustment screw. See the hardware manual for

details.

Note that the parameter J55: EXT ZERO ADJ must

be ENABLE to perform this adjustment.

Follow the procedure below to enable or inhibit zero

point adjustment from the zero-adjustment screw

on the transmitter.

This is set to ENABLE when the instrument is

shipped.

• Example: Inhibiting zero adjustment by the

external zero-adjustment screw.

ESC

SET

J55:EXT ZERO ADJ

ENABLE

< ENABLE >

< INHIBIT>

Use the or key

to select INHIBIT.

Press the key twice to

enter the setting.

F0339.ai

Then press the (OK) key.

b. Full Sensor Trim (J11: P ZERO ADJ, J12: P

SPAN ADJ, J15: P ZERO DEV, J16: P SPAN

DEV)

Full sensor trim is carried out with a series of the

procedure of J11: P ZERO ADJ and J12: P SPAN

ADJ. Also, you can manually perform the trimming

procedure by using J15: P ZERO DEV and J16: P

SPAN DEV.

The full sensor trim is a two-point adjustment,

and the lower point adjustment should always be

performed before the upper point adjustment in

order to maintain the pitch between the zero and

100% points within the calibration range.

In the manual method, the reference pressure

should also be applied to the transmitter at both

lower and upper point of trim ends. Without the

reference pressure, J15: P ZERO DEV and J16: P

SPAN DEV may not represent the correct value of

adjustment point for each.

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Yokogawa EJA440E Manuel d'utilisateur Page 23

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