01

MEASURING PRINCIPLE

Transit-time ultrasonic flow

Ultrasonic pulses travel faster with the flow than against it; the time difference gives velocity.

PRINCIPLE · LIVE SIGNAL13.9mA
Transit-time ultrasonic flow: how it works | INSTRAVAPRIN01

02

HOW IT WORKS

See the principle in action

Move the slider to change the process variable and watch the signal respond.

Transit-time ultrasonic flow
Transit-time ultrasonic flow: how it works | INSTRAVAΔt = 240 nsUPSTREAM − DOWNSTREAM TRANSIT TIME
FLOW VELOCITY
6.00 m/s
OUTPUT
12.0 mA
  1. Two transducers clamp on the outside of the pipe.
  2. A pulse travels faster with the flow than against it.
  3. The transit-time difference gives velocity, with no cutting of the pipe.

03

AT A GLANCE

Strengths and limits

STRENGTHS

Non-invasive clamp-on installation, no shutdown

LIMITS

Needs clean liquid and good pipe condition

06

READ MORE

Articles and downloads

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07

FAQ

Common questions

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RFQ

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