Reasons to use Orifice based DP Flow Transmitter


#1

This article covers the Reasons to use Orifice based DP Flow Transmitter and Reasons NOT to use Orifice based DP Flow Transmitter

Reason for using orifice based DP flow transmitter

  1. Simple (but they are hard to install to get a good velocity profile)

  2. Inexpensive (well there are cheap ultrasonic flowmeters with better accuracy and turndown ratio than DP transmitter today)

  3. Available in various sizes, type, and connections.

  4. Simple design, rugged, and suitable for liquids, gases, steam.

Reason for NOT using orifice based DP flow transmitter

  1. Low down turn ratio, typically 3:1 with accuracy not exceed than +/- 1%

  2. Sensitive for flow profile (next time if the process engineer ask why the flow measurement inaccurate, tell them with the flow profile is laminar and the reynolds number is insufficient)

  3. The process fluid is in the impulse lines to the differential transmitter may freeze or block (plug)

Read about Orifice Meters - click here


#2

Straight length requirements are also one of the drawbacks.