Prime Probe

Bi-directional, insertion, full bore, electromagnetic flowmeter for permanent or portable use.




The PrimeProbe is a cost effective alternative to full-bore flow meters and is ideal for use over a wide range of flows and pipe diameters. The flexible data logging capacity enables sophisticated convenient data analysis, delayed or in real-time.
Features & Benefits At A Glance
Ovarro_Icons_F&B_NoTitles_Colour_RGB_Flow Measurement.svg

Ability to measure flow on all common pipes


Battery life of up to 10 years

Ovarro_Icons_F&B_NoTitles_Colour_RGB_Tech Spec.svg

Rugged - can operate at up to 25 bar


Remotely connects to Cloud Analytics software or SCADA systems

SMART mode optimum performance

PrimeProbe SMART mode offers optimum accuracy whilst preserving battery life. This mode automatically adjusts the measurement response time when variation of the flow velocity occurs. This gives more accurate results when the flowrate is changing rapidly and also preserves battery life when the flow-rate is stable.

Primeprobe laptop.png

Installation in pipelines is typically via a small valve tapping. It may be installed with the sensor on the pipe centreline or at the position of mean velocity (1/8 pipe diameter). PrimeProbe is a very rugged device with a strong stem and sensor, plus a safety chain. It is available with a choice of six insertion lengths and is waterproof to IP68.

Find a distributor

Flexible data collection

The PrimeProbe provides a pulsed output which may be connected to a PrimeLog+ data logger (for local data collection) or to XiLog+ (for remote data collection). XiLog+ data can be transferred to any FTP server to be viewed online using PrimeWeb or connection to SCADA systems.

Logged flow and pressure data can also be transferred to PrimeWorks or XAP Desktop, providing graphing, reporting, export and database facilities.

Flow Profiling

If the flow velocity profile is fully developed, the flow meter provides an accurate measurement of water velocity and flow volume. A software package is available to determine the velocity profile by measuring at multiple positions across the pipe.

Measurement range

Bi-directional from 0.02m/s to 5m/sec (maximum may be lower dependent upon insertion length and position in pipe)


Point velocity ≥0.4m/s; ±2%

(See Note 1 below)

Point velocity <0.4m/s; ±0.8/V% (V = measured water velocity)

Flow determination

Assumes developed profile (determine via Flow Profiling Software)

Response time

Liquid speed step variations >0.25m/s;

Response time

Continuous mode = 300ms

Response time

SMART mode = 3s

Response time

Average mode = 6s

Response time

Maximum life mode = 15s

Minimum fluid conductivity


Process connection

1 inch (25mm) BSP threaded end

Pipeline Pressure rating

25 Bar

Sensor material


Body/electrodes material

Stainless steel AISI 316

Liquid temperature range

0 deg. C to 60 deg. C


Probe fitted with safety/anti-bounce chain

Pressure tapping

Female quick-release connector

Adjustment method

5mm Allen key (supplied) fits all screws


IP68 (to 1 metre depth)

Battery type

2 x Lithium cells size D (non-rechargeable)

Battery life

Continuous mode = 7.8 months

Battery life

SMART mode = 4.8 years

Battery life

Average mode = > 8 years

Battery life

Maximum life mode = >10 years

Output signal

Pulses proportional to velocity/flow-rate (max. frequency 100 Hz)



Materials certification

WRAS drinking water material Approval Number 1205543

Materials certification

ACS Approval Number 16ACC LY 116
Download Specification Sheet
Download Quick Reference Guide

Locate Your Distributor

Click below to search for your local distributor

Make an enquiry

Need more information? Don't hesitate to get in touch