# Open and Closed Tank Level Calculations

### Open tank : Level Transmitter installed at HP Tapping Point

In above example, transmitter installed exactly at HP tapping point i.e. at 0 % Level

#### Calibration Range

LRV or 4mA point = 1.1 * 0 = 0 inH2O

URV or 20mA Point = Head = 1.1*50” = 55 inH2O

Cal. Range = 0 to 55 inH2O

### Open Tank : Level Transmitter Zero Scale above HP Tapping Point

In above example, transmitter installed point and Tank Zero Percentage level are different.

#### Calibration Range

LRV or 4mA point = Head1 = 1.1*10” = 11 inH2O

URV or 20mA Point = Head2 = 1.1*50” = 55  inH2O

Cal. Range = 11 to 55 inH2O

### Open Tank : Level Transmitter Installed below HP Tapping Point

#### Calibration Range

LRV or 4mA point = Head1 = 1.1*10” = 11 inH2O

URV or 20mA Point = Head1 + Head2 = (1.1*10”) + (1.1*50”) = 66 inH2O

Cal. Range = 11 to 66 inH2O

## Closed Tank Level Calculation (Wet Leg)

### Closed Tank : Level Transmitter installed at HP Tapping Point

In above example, transmitter installed exactly at HP tapping point i.e. at 0 % Level

#### Calibration Range

LRV or 4mA point =  Phigh – Plow = 0 – Head1 = 0 – (1.2*70”) = -84”H2O

URV or 20mA Point = Phigh – Plow = Head2 – Head1 = (1.1*50”)] – (1.2*70”) = -29”H2O

Cal. Range = -84 to -29 inH2O

### Closed Tank : Level Transmitter Zero Scale above HP Tapping Point

In above example, transmitter installed point and Tank Zero Percentage level are different.

#### Calibration Range

LRV or 4mA point = Phigh – Plow = Head2 – Head1 = (1.1*10”) – (1.2*70”) = -73”H2O

= [(1.1*10”) + (1.1*40”)] – (1.2*70”) = -29”H2O

Cal. Range = -73 to -29 inH2O

### Closed Tank : Level Transmitter Installed below HP Tapping Point

#### Calibration Range

LRV or 4mA point = Phigh – Plow = Head2 – Head1 = (1.1*10”) – (1.2*80”) = -85”H2O

= [(1.1*10”) + (1.1*50”)] – (1.2*80”) = -30”H2O

Cal. Range = -85 to -30 inH2O

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### 7 thoughts on “Open and Closed Tank Level Calculations”

1. Easy Calculations & in Understandable way. Thanks Bharadwaj sir.

2. Sir how to mount dot in for vaccum tank level measurement already we are using magnetic level gauge which works on magnetostrictive principle.

3. Thank you this a simple calculation