Yokogawa EJA440E Bedienungsanleitung PDF herunterladen (Seite 15)

<3. Operation>

3-7

IM 01C25T03-01E

b. Setting Calibration Range Lower Range

Value and Upper Range Value

(C21: PRES LRV, C22: PRES URV)

These range values are set as specied in the

order before the instrument is shipped. Follow the

procedure below to change the range.

• The measurement span is determined by the

upper and lower range limit values. In this

instrument, changing the lower range value also

automatically changes the upper range value,

keeping the span constant.

• Example 1: With present settings of 0 to 30 kPa,

set the lower range value to 0.5 kPa.

Span = Upper range value – Lower range value

FEED NO OK

SET

C21:PRES LRV

0.5 kPa

DATA DIAG PRNT ESC

PARAM

C20:PRES UNIT

kPa

C21:PRES LRV

0.5 kPa

C22:PRES URV

30.5 kPa

DEL CLR ESC

SET

C21:PRES LRV

0 kPa

+ 0.5

The upper range value is changed

while the span remains constant.

Set 0.5.

Press the key twice to

enter the setting.

Press the (OK) key.

F0313.ai

• Entering the range values as LRV>URV

reverses the direction of the output signal

of 4-20 mA to 20-4 mA corresponding to the

calibration range of 0 to 100%.

• Calibration range can be specied with range

value specications up to 5 digits (excluding

any decimal point) for lower or upper range

limits within the range of –32000 to 32000.

• Note, however, that changing the upper range

value does not cause the lower range value to

change. Thus, changing the upper range value

also changes the span.

• Example 2: With present settings of 0 to 30 kPa,

set the upper range value to 10 kPa.

FEED NO OK

SET

C22:PRES URV

10 kPa

DATA DIAG PRNT ESC

PARAM

C20:PRES UNIT

kPa

C21:PRES LRV

0 kPa

C22:PRES URV

10 kPa

DEL CLR ESC

SET

C22:PRES URV

30 kPa

+ 10

The lower range value is not

changed, so the span changes.

Set 10.

Press the key twice

to enter the setting.

F0314.ai

Press the (OK) key.

(3) Damping Time Constant Setup

(C30: AMP DAMPING)

When the instrument is shipped, the damping time

constant is set at 2.00 seconds unless otherwise

specied in the order. Follow the procedure below

to change the damping time constant.

Note that setting the quick response parameter

(D50: QUICK RESP) ON enables you to set the

damping time constant between 0.00 to 0.49

second.

• Example: Change from 2.00 to 4.00 seconds.

ESCCLR

SET

C30:AMP DAMPING

4.00 sec

FEED NO OK

SET

C30:AMP DAMPING

2.00 sec

+ 004.00

Enter 4.

Press the key twice to

enter the setting.

F0315.ai

Press the (OK) key.

Note 1: The damping time constant set here is the time

constant for the amplier assembly. The damping time

constant for the entire transmitter is the sum of the

values for the amplier assembly and for the capsule

assembly.

Note 2: When the damping time constant is set to less than

0.5 second, communication may occasionally be

unavailble during the operation, especially while output

changes dynamically.

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