Yokogawa EJX438B Manual de usuario descargar pdf (Pagina 21)

<4. Installation>

4-3

IM 01C27H01-01EN

■ When mounting the bracket on the transmitter,

tighten the (four) bolts that hold the transmitter

to a torque of approximately 39 N·m {4 kgf·m}.

IMPORTANT

• The transmitter should be installed at least

600 mm below the high pressure (HP)

process connection to ensure a positive

head pressure of ll uid. Pay special

attention to vacuum applications.

Refer to “When the transmitter can’t be

installed at least 600 mm below the HP

process connection” if the transmitter can’t

be installed at least 600 mm below.

• Never loosen the four bolts securing the

cover ange or the screws at the joints

between the capillary tube and cover anges

(Refer to gure 3.2.) If the seal liquid leaks,

the transmitter cannot be used.

Horizontal pipe mounting

Vertical pipe mounting

Transmitter

mounting bolt

Transmitter

mounting bolt

U-bolt nut

Mounting

bracket

Mounting

bracket

50mm (2-inch) pipe

50mm

(2-inch) pipe

U-bolt

F0404.ai

Figure 4.4 Transmitter Mounting

■ When the transmitter can’t be installed at least

600 mm below the HP process connection.

IMPORTANT

The transmitter should be installed at least

600 mm below the high pressure (HP) process

connection to ensure a positive head pressure

of ll uid. Pay special attention to vacuum

applications.

If it can not be installed at least 600 mm below

the HP process connection, please use the

equation below:

h = ×7.5×10

–3

[mm]

(P–P0) × dHg

h: Vertical height between the HP process

connection and the transmitter (mm)

h≤0: Install the transmitter at least h (mm)

below the HP process connection

h>0: Install the transmitter at most h (mm)

above the HP process connection

P: Pressure in the tank (Pa abs)

P0: Minimum working pressure limit of

the transmitter (Pa abs) If the ambient

temperature range is –10 to 50°C.

2951 (Wetted parts material code SW, SE

and SY)

3185 (Wetted parts material code TW)

4573 (Wetted parts material code HW)

3810 (Wetted parts material code UW)

ds: Specic gravity of ll uid (at 25°C), refer

to table 10.1 on section 10.1 General

Specications.

dHg:Specic gravity of the Mercury 13.6 (at

25°C)

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 ... 103 104

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Yokogawa EJX438B Manual de usuario Pagina 21

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