This document discusses the art of instrument selection for level measurement. It covers common reasons for level measurement like inventory and safety. It also discusses important terminology like interface, density and specific gravity. The document compares different level measurement technologies like manual, electromechanical, electronic contacting and non-contacting. It provides a table to classify level measurement and stresses determining the right technology based on how it works, required conditions, accuracy, vessel accessability and vessel details. Instrument selection should consider the measurement purpose, product characteristics, requirements and total cost.

1. THE Art of Level Instrument Selection
PRESENTED BY:
ANISH DAS

2. General Review:
 1. Common reasons for measuring level
 Inventory, Custody transfer, Efficiency, Safety, Consistent Supply
 2. Units of measurement
 3. Important terminologies
 Interface, Density, Specific gravity, Mass, Volume, Transmitter Datum
 4. Device Characteristics
 Continuous vs Single point, Bottom up vs Top down, Direct vs Indirect, Indication vs
Control, Contacting vs Non contacting
 5. Level Technologies
 Manual/Mechanical, Electromechanical, Electronic Contacting, Electronic Non-
Contacting
 6. Device Selection

3. Level Technologies:

4. Determination of the right technology:
 1. How does each type of level technology actually
work?
 2. In what conditions must the instrument perform?
 3. What is the required accuracy and repeatability of
the level reading?
 4. Can the vessel be taken out of service for
maintenance, and is there any way to independently
verify the level for calibration?
 5. What are the details of the vessel itself?

5. Table: Level Measurement Classification

6. Important points to be considered:
 1. For what purpose is the level measurement
needed?
 2. What are the product characteristics?
 3. What are the instrument requirements?
 4. What is the total cost of the device?

7. Thank you