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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.

Dist. Between Taps = H
DP = Hside – Lside
DP = (L*SGp + h*SGf ) – (H+h)*SGf
DP = L*SGp – H*SGf
Double Remote Seal Application

Calibration Range
LRV or 4mA point = Phigh – Plow
LRV = Head2 – Head1
LRV = (0.9*30”) – (0.9*100”)

LRV = -63”H2O

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

URV = -8”H2O

Cal. Range = -63 to -8 in H2O
Max. Allowable ΔS.G = 0.2

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

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

LRV = 18”H2O

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

URV = 42”H2O

Cal. Range = 18 to 42 inH2O

Interface Calculation with Remote Seals Transmitter
Application Example: To determine % of interface of Liquid A with respect to Liquid B.

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

Calibration Range
LRV or 4mA point = 120” * (SG1 – SGf)

LRV = 120” * (1.1 – 0.95)

LRV = 18”H2O

URV or 20mA Point = 120” * (SG2 – SGf)

URV = 120” * (1.3 – 0.95)

URV = 42”H2O

Cal. Range = 18 to 42 inH2O
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