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Appendix C - Elevation and Suppression Correction UMSITRPDS3-1

13-2 November 2010

Note that the URL (Upper Range Limit), LRL (Lower Range Limit), and Min Span are transmitter

dependent.

13.2 ELEVATION CALCULATION EXAMPLE

Figure C-3 shows a sample transmitter installation.

1. Calculate the differential pressure as follows.

Pressure

@DP

= (H × SpG)

High Side

- (H × SpG)

Low Side

where H = Height

2. Calculate the LRV when the tank is empty.

LRV = (120 × 1.0)

High Side

- (0 × 1.0)

Low Side

LRV = +120 inH

3. Calculate the URV.

URV = LRV + Span

URV = +120 + 100

URV = 220 inH

Therefore, transmitter range should be 120 to 220 inH

13.3 SUPPRESSION CALCULATION EXAMPLE

Figure C-4 shows a sample transmitter installation.

1. Calculate the differential pressure as follows.

Pressure

@DP

= (H × SpG)

High Side

- (H × SpG)

Low Side

where H = Height

2. Calculate the LRV when the tank is empty.

LRV = (0 × 1.0)

High Side

- (100 × 1.0)

Low Side

LRV = -100 inH

3. Calculate the URV.

URV = LRV + Span

URV = -100 + 100

URV = 0 inH

Therefore, transmitter range should be -100 to 0 inH

Max. Range

Min. Range

100"

Vent

SpG=1.0

120"

MG00363b

FIGURE 13-2 Elevation Calculation

Max. Range

Min. Range

Span

100"

SpG=1.0

MG00363b

LP Line

Filled with

Condensate

FIGURE 13-3 Suppression Calculation

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