# Displacer type interface level transmitter dry calibration weight calculator

- Formula for the calculation
- Formula for the volume of the displacer
- Formula for calculating the displacer weight loss due to process liquid
- Formula for zero apparent weight calibration
- Formula for span apparent weight calibration
- Example calculation
- Zero calibration weight value calculation (0%)
- Span calibration weight value calculation (100%)
- Weight for each 25% calibration check of linearity
- Displacer type interface level transmitter dry calibration weight calculator

The Displacer interface level transmitter dry calibration weight calculator is a valuable tool used in industrial settings for the calibration of displacer interface level transmitters without the need for process liquid.

- The Displacer type interface level transmitter dry calibration weight calculator is significant as it ensures accurate calibration of the transmitter, leading to reliable interface level measurements.
- It saves time and reduces costs by providing precise weight values for calibration, eliminating trial and error.
- Proper calibration maintains consistency and reliability, optimizing industrial processes and ensuring safety and environmental compliance.
- Proper calibration using the weight calculator ensures consistency and reliability of the interface level transmitter over time.

**Formula for the calculation**

**Formula for the volume of the displacer **

Volume of the displacer V = Ï€r^{2}h

Where,

r = Radius of the displacer.

h = Length of the displacer.

D = Diameter of the displacer

**Formula for calculating the displacer weight loss due to process liquid**

Displacer weight loss due to process liquid =Volume of the displacer X Specific gravity of the process liquid

**Formula for zero apparent weight calibration **

Weight for zero calibration = Displacer Actual Weight(W) â€“ (Displacer Actual Volume X specific gravity of the Lsg liquid)

Where

Lsg = Specific gravity lighter process liquid

W = Actual weight of the displacer

**Formula for span apparent weight calibration **

Weight for Span calibration = Displacer Actual Weight(W) â€“ (Displacer Actual Volume X specific gravity of the Hsg liquid)

Where

Hsg = Specific gravity heavier process liquid

** **** **W = Actual weight of the displacer

**Example calculation**

Displacer and process liquid characteristics:

W = Displacer weight is 2400 Gram

D = Displacer diameter is 7.0 Centimeter

H = Length of Displacer is 32.42 Centimeter

Lsg = Specific gravity of lighter process liquid is 0.7

Hsg = Specific gravity of Heavier process liquid is 1.0

V = Volume of displacer.

So,

Radius of the displacer r = 7.0/2 = 3.5 centimeters

Displacer Actual volume V = Ï€r^{2}h

Volume V = 3.14 Ã— rÂ² Ã— h

= 3.14 Ã— 3.5 Ã— 3.5 Ã— 32.42 = 1247.04 cubic centimeter

**Zero calibration weight value calculation (0%)**

Displacer weight loss due to lighter process liquid = Displacer Actual Volume X Specific gravity of the Lsg liquid

Weight for zero calibration = Displacer Actual Weight (W) â€“ (Displacer Actual Volume X Specific gravity of the Lsg liquid

Weight for zero calibration = 2400 – (1247 X 0.7)

= 2400 – 872.9

**Weight for zero calibration =1527.1 grams**

**Span calibration weight value calculation (100%)**

Displacer weight loss due to heavier process liquid = Displacer Actual Volume X Specific gravity of the Hsg liquid

Weight for Span calibration = Displacer Actual Weight (W) â€“ (Displacer Actual Volume X specific gravity of the Hsg liquid)

Weight for Span calibration = 2400 – (1247 X 1.0)

= 2400 – 1247

**Weight for Span calibration =1153 grams**

**Weight for each 25% calibration check of linearity**

Actual span weight is calculated by subtracting the weight lost by the displacer due to the heavier process liquid (Hsg) and the lighter specific gravity liquid (Lsg).

Actual span weight = 1247 – 872.9

Actual span weight = 374.1

For each 25% = Actual span weight/4

= 374.1/4

**For each 25% = 93.525 grams**

**Displacer type interface level transmitter dry calibration weight calculator **

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