Yokogawa EJA110E User Manual download pdf (Page 25)

<4. Installation>

4-3

IM 01C25B01-01E

4.4 Swapping the High/Low-

pressure Side Connection

IMPORTANT

This section is applicable only for EJ110,

EJ120, and EJ130 differential

transmitters, and not applicable for gauge or

absolute pressure transmitters.

4.4.1 Rotating Pressure-detector Section

180°

This procedure can be applied only to a transmitter

with a vertical impulse piping type.

The procedure below can be used to turn the

pressure detector assembly 180°. Perform

this operation in a maintenance shop with the

necessary tools laid out and ready for use, and then

install the transmitter in the eld after making the

change.

1) Use an Allen wrench (JIS B4648, nominal 2.5

mm) to remove the two setscrews at the joint

between the pressure-detector section and

transmitter section.

2) Leaving the transmitter section in position,

rotate the pressure-detector section 180°.

3) Tighten the two setscrews to x the pressure-

detector section and transmitter section

together (at a torque of 1.5 N·m).

Reposition the process connector and drain

(vent) plugs to the opposite side as described in

subsection 4.3.

F0405.ai

Process connector

Setscrew

Before

After rotating 180°

Figure 4.5 Before and After Modication

4.4.2 Using the Communicator

This method is applicable only to the Model

EJ110, EJ120, and EJ130.

With a communicator, you can change which

process connection is used as the high-pressure

side without mechanically rotating the pressure-

detector section 180 as described in subsection

4.4.1. To change, call parameter ‘D15: H/L SWAP’

for BRAIN Communication or ‘H/L swap’ for HART

Communication and select REVERSE (right side:

low pressure; left side: high pressure) or select

NORMAL to change back to normal (right side: high

pressure; left side: low pressure).

Output

Input

NORMAL

REVERSE

F0406.ai

Figure 4.6 Input/Output Relationship

IMPORTANT

Since the H/L label plate on the capsule

assembly will remain unchanged, use this

function only when you cannot switch the

impulse piping. If the ‘H/L SWAP’ parameter

setting is changed, the input/output relationship

is reversed as shown in gure 4.6; be sure this is

understood by all.

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Yokogawa EJA110E User Manual Page 25

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