Emerson 3051S Specifications download pdf (Page 47)

Reference Manual

00809-0100-4001, Rev JA

Section 2: Installation

November 2012

Installation

Figure 2-26. Wet leg example.

Let X equal the vertical distance between the minimum and maximum

measurable levels (500 in.).

Let Y equal the vertical distance between the transmitter datum line and the

minimum measurable level (50 in.).

Let z equal the vertical distance between the top of the liquid in the wet leg and

the transmitter datum line (600 in.).

Let SG

equal the specific gravity of the fluid (1.0).

Let SG

equal the specific gravity of the fluid in the wet leg (1.1).

Let h equal the maximum head pressure to be measured in inches of water.

Let e equal the head pressure produced by Y expressed in inches of water.

Let s equal head pressure produced by z expressed in inches of water.

Let Range equal e – s to h + e – s.

Then h = (X)(SG

)

=500 x 1.0

=500 in H

e = (Y)(SG

)

= 50 x 1.0

=50 inH

s = (z)(SG

)

=600 x 1.1

=660 inH

Range = e – s to h + e – s.

= 50 – 660 to 500 + 50 – 660

= –610 to –110 inH

ZERO ELEVATION

H L

mA dc

-110-610

inH

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Emerson 3051S Specifications Page 47