Yokogawa EJA530A - Manual (Page 23)

IM 01C21F01-01E 5-1
5. INSTALLING IMPULSE PIPING
5. INSTALLING IMPULSE PIPING
5.1 Impulse Piping Installation
Precautions
5.1.1 Connecting Impulse Piping to the
Transmitter
IMPORTANT
The transmitter can be installed in horizontal
impulse piping configuration, tilting the
transmitter's position up to 90
°. When tilting,
observe that the zero-adjustment screw and the
pipe (for Model EJA530A with Measurement
span code A, B, and C) are positioned down-
wards, as shown in Figure 5.1.1.
F0503.EPS
Pipe
(Open to atmosphere)
Zero-adjustment screw
Figure 5.1.1 Horizontal Impulse Piping Connection
5.1.2 Routing the Impulse Piping
(1) Process Pressure Tap Angles
If condensate, gas, sediment or other extraneous
material in the process piping gets into the impulse
piping, pressure measurement errors may result. To
prevent such problems, the process pressure taps must
be angled as shown in Figure 5.1.2 according to the
kind of fluid being measured.
NOTE
• If the process fluid is a gas, the taps must be
vertical or within 45
° either side of vertical.
• If the process fluid is a liquid, the taps must be
horizontal or below horizontal, but not more
than 45
° below horizontal.
• If the process fluid is steam or other condens-
ing vapor, the taps must be horizontal or above
horizontal, but not more than 45
° above hori-
zontal.
[Gas]
Pressure
taps
Process
piping
[Steam] [Liquid]
45 °
45 °
45 ° 45 °
45 °
45 °
F0504.EPS
Figure 5.1.2 Process Pressure Tap Angle (For Horizontal
Piping)