Yokogawa EJA530A Manuel d'utilisateur télécharger pdf (Page 31)

IM 01C21F01-01E

7-4

7. OPERATION

7.5 Setting the Range Using the

Range-setting Switch

With actual pressure being applied to the transmitter,

the range-setting switch (push-button) located on the

optional /E integral indicator plate and the external

zero-adjustment screw allow users to change (re-range)

the low- and high-limit values for the measurement

range (LRV and HRV) without using BT200. How-

ever, other changes in the display settings (scale range

and engineering unit) for the integral indicator requires

BT200.

Follow the procedure below to change the LRV and

HRV settings.

[Example]

Rerange LRV to 0 and HRV to 3 MPa.

1) Connect the transmitter and apparatus as shown in

Figure 9.3.1 and warm up for at least five minutes.

2) Press the range-setting push-button.

The integral indicator then displays “LSET.”

3) Apply a pressure of 0 kPa (atmospheric pressure) to

the transmitter.

(Note 1)

4) Turn the external zero-adjustment screw in the

desired direction. The integral indicator displays the

output signal in %.

(Note 2)

5) Adjust the output signal to 0% (1 V DC) by rotating

the external zero-adjustment screw. Doing so

completes the LRV setting.

6) Press the range-setting push-button. The integral

indicator then displays “HSET.”

7) Apply a pressure of 3 MPa to the transmitter.

(Note 1)

8) Turn the external zero-adjustment screw in the

desired direction. The integral indicator displays the

output signal in %.

(Note 2)

9) Adjust the output signal to 100% (5 V DC) by

rotating the external zero-adjustment screw. Doing

so completes the HRV setting.

10) Press the range-setting push-button. The transmitter

then switches back to the normal operation mode

with the measurement range of 0 to 3 MPa.

Note 1: Wait until the pressure inside the pressure-detector section

has stabilized before proceeding to the next step.

Note 2: If the pressure applied to the transmitter exceeds the previous

LRV (or HRV), the integral indicator may display error

number “Er.07” (In this case, the output signal percent and

“Er.07” are displayed alternately every two seconds).

Although “Er.07” is displayed, you may proceed to the next

step. However, should any other error number be displayed,

take the appropriate measure in reference to Subsection

8.5.2, “Errors and Countermeasures.”

IMPORTANT

• Do not turn off the power to the transmitter

immediately after completion of the change in

the LRV and/or HRV setting(s). Note that

powering off within thirty seconds after setting

will cause a return to the previous settings.

• Changing LRV automatically changes HRV to

the following value.

HRV = previous HRV + (new LRV – previous LRV)

• If the range-setting push-button and external

zero-adjustment screw are not touched during a

range-change operation, the transmitter auto-

matically switches back to the normal operation

mode.

F0707.EPS

Integral indicator

Range-setting switch

(Push-button)

Note : Use a thin bal which

has a blunt tip, e.g.,

a hexagonal wrench,

to press the range-

setting push-button

Figure 7.5 Range-setting Switch

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Yokogawa EJA530A Manuel d'utilisateur Page 31

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