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Level Calculation with Remote Seals

Diaphragm seals for tanks under Vacuum

The transmitter must be mounted level with or below the lowest tap to ensure positive pressure at the transmitter.

Level Calculation with Remote Seals

Dist. Between Taps = H

DP = Hside – Lside
= (L*SGp + h*SGf ) – (H+h)*SGf
= L*SGp – H*SGf

Double Remote Seal Application

Double Remote Seal Application

Calibration Range

LRV or 4mA point = Phigh – Plow
= Head2 – Head1
= (0.9*30”) – (0.9*100”)
= -63”H2O

URV or 20mA Point = Phigh – Plow
= (Head2 + Head3) – Head1
= [(0.9*30”) + (1.1*50”)] –
(0.9*100”)
= -8”H2O

Cal. Range = -63 to -8 in H2O

Density Calculation with Remote Seals

Density Calculation with Remote Seals

Max. Allowable ΔS.G = 0.2

Dist. Betw. Taps = 10 ft
= 10 x 12”
= 120”

Calibration Range

LRV or 4mA point = 120” * (SGp – SGf)
= 120” * (1.1 – 0.95)
= 18”H2O

URV or 20mA Point = 120” * (SGp – SGf)
= 120” * (1.3 – 0.95)
= 42”H2O

Cal. Range = 18 to 42 inH2O

Interface Calculation with Remote Seals

Application Example: To determine % of interface of Liquid A with respect to Liquid B.

Interface Calculation with Remote Seals

Dist. Betw. Taps = 10 ft
= 10 x 12”
= 120”

Calibration Range

LRV or 4mA point = 120” * (SG1 – SGf)
= 120” * (1.1 – 0.95)
= 18”H2O

URV or 20mA Point = 120” * (SG2 – SGf)
= 120” * (1.3 – 0.95)
= 42”H2O

Cal. Range = 18 to 42 inH2O

Also Read: Level Switch Animation

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