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UMSITRPDS3-1 Appendix C - Elevation and Suppression Corrections

November 2010 13-1

13.0 APPENDIX C - ELEVATION AND SUPPRESSION CORRECTIONS

When installing a transmitter to measure liquid level, configuration of the Sensor Input Block often must

include an adjustment for one of two conditions introduced by the mounting arrangement:

• Elevated Span - The Lower Range Value (LRV) of the transmitter needs to be configured

above “0.” See Figure C-1.

• Suppressed Span - The LRV of the transmitter needs to be configured below “0.” See

Figure C-2.

Max. Range

Min. Range

HP Shut-Off

Valve

Vent

Span

Elevated Span: To

calculate maximum

distance, subtract

actual span setting

from range limit given

in specification.

Vent

MG00363b

Fill Connection

See

Section 9

Specifi-

cations

for range

limit.

LP line

filled with

condensate

Max. Range

Min. Range

LP Shut-Off

Valve

HP Shut-Off

Valve

Span

Distance X

Suppressed

Span

MG00363b

A. Elevated Span

B. Suppressed Span

FIGURE 13-1 Elevation and Suppression Examples

A brief discussion of how to make adjustments for elevation and suppression follows. Then two examples

of the calculations needed to determine configuration parameters are given. Finally, a brief procedure that

does not involve calculations is provided.

13.1 HOW ADJUSTMENT IS MADE

Because the transmitter can handle elevation and suppression simply by setting parameters, it is not

necessary to introduce mechanical measures, such as installing piping backwards or adding additional

hardware.

The range of the transmitter can be set anywhere, forward or reverse acting, as long as the following

criteria are met:

LRL ≤ LRV ≤ URL

LRL ≤ URV ≤ URL

Span = [URV - LRV] ≥ Min Span

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