Flomec OM025 User Manual

9 pages

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IMOMMED-0907

I N S T R U C T I O N M A N U A L

Models : OM025, OM040 & OM050

Flomec

Factory

1 / 19 Northumberland Road,

Caringbah NSW 2229, Sydney

AUSTRALIA

tel : +61 2 9540 4433

fax : +61 2 9525 9411

email : sales@flomec.com.au

website : www.flomec.com.au

USA

916 Belcher Drive

Pelham, AL 35124

USA

Tel : +1 205 378 1050

Fax : +1 205 685 3001

Email : customerservice@trimecus.com

Website : www.

trimecus

.com

Distributed by:

Each meter has been calibrated on mineral oil

and will contain a small amount of oil residue.

The oil used is Castrol Diesel Calibration

Fluid 4113 (product code 055830).

Medium capacity positive displacement flowmeters

OVAL GEAR

SEE OVER

Questions and Answers:

M
Matthew ButlerAug 1, 2025
What to do if Flomec OM025 meter readings are low?
- T
  Tyler HarrisAug 2, 2025
  If your Flomec Measuring Instruments meter readings are low, it could be due to several factors. Damaged or worn rotors can cause this issue; inspect, repair, clean, or replace the rotors. Similarly, a damaged or worn measuring chamber can be responsible; inspect the measuring chamber for damage and repair it, and check the concentricity of rotor shafts within the chamber. Output signal interference is another potential cause, which can be resolved by grounding the shield of the signal cable, re-routing the cable away from high electrical energy sources, and checking all electrical terminations and wires for continuity.
J
Jeff AlexanderAug 15, 2025
Why are my Flomec OM025 Measuring Instruments meter readings high?
- C
  colemancynthiaAug 16, 2025
  If your Flomec Measuring Instruments meter readings are too high, there might be several reasons. One potential cause is output signal interference, which can be resolved by grounding the shield of the signal cable. Another cause could be entrained air or gas; in this case, remove the source of air or gas entrapment, or install an upstream air eliminator. If the flow is pulsating due to a reciprocating style pump, try increasing back pressure on the pump, installing a fast response one-way check valve, or installing a surge arrestor between the pump and meter. Alternatively, you could re-calibrate the meter in situ to compensate for pulsations or change the pump style to a smooth delivery type.

Flomec OM025 Specifications

General

Brand	Flomec
Model	OM025
Category	Measuring Instruments
Language	English

Summary

General Information

Overview of Oval Gear Meters

Explains the Oval Gear meter as a precise positive displacement flowmeter for clean liquids.

Operating Principle of Oval Gear Meters

Describes how rotating oval gears displace fixed volumes of liquid to generate pulses for flow measurement.

Model Number Information

Provides guidance on understanding the model number to identify specific meter configurations.

Technical Specifications Overview

Lists the detailed technical specifications and performance parameters for the flowmeters.

Installation Procedures

Mechanical Installation Requirements

Details the physical requirements and procedures for installing the flowmeter.

Correct Meter Orientation

Specifies the crucial requirement for mounting the meter with rotor shafts in a horizontal plane.

Flow Conditioning and Location Guidelines

Covers recommended upstream strainers and preferred installation locations to optimize performance.

Electrical Installation Guidelines

Outlines the procedures for connecting the meter to electrical systems and instruments.

Instrument Cable Specifications

Specifies the type of low-capacitance shielded cable required for reliable signal transmission.

Hazardous Area Wiring Procedures

Provides essential guidance for safely wiring the meter in hazardous area environments.

Pulse Output Options Explained

Explains the different pulse output types (Hall effect, Reed switch, Quadrature) and their applications.

Hall Sensor Pulse Output

Details the NPN open collector output from Hall effect sensors for powered installations.

Reed Switch Pulse Output

Describes the normally open, voltage-free contact output from reed switches for unpowered applications.

Quadrature Pulse Output

Explains the quadrature output option for signal integrity and bi-directional flow metering.

Signal Integrity Verification

Discusses using quadrature outputs to verify signal integrity in fiscal transactions.

Bi-directional Flow Measurement

Explains how quadrature outputs can be used to measure net forward and reverse flow.

Meters with Integral Instruments

Covers flowmeters that include integrated instruments like totalizers or batch controllers.

Meter Calibration Factor (K-Factor)

Explains the importance of the K-factor and its role in accurate meter calibration.

Commissioning and Maintenance

Commissioning Steps

Details the final steps to prepare the meter for operation after installation and flushing.

Maintenance Overview

Provides guidelines for periodic maintenance and inspection to ensure operational availability.

Disassembly of Pulse Meter

Details how to disassemble a standard pulse meter for access to terminals and rotors.

Disassembly of Meters with Instruments

Explains how to disassemble meters with integral instruments for access to components.

Spare Parts and Exploded Views

Provides a list of spare parts and an exploded view for meter identification and replacement.

Meter Inspection Procedures

Guides on inspecting components like O-rings and rotors for damage or wear.

Re-assembly of Meter

Details the procedure for correctly re-assembling the meter after maintenance.

Model Coding and Specifications

Model Number Breakdown System

Explains the coding system for selecting models, body materials, rotor materials, and options.

Detailed Specifications Table

Presents a comprehensive table of technical specifications for different Oval Gear meter models.

Available Integral Options

Lists various optional integral instruments available for the flowmeters.

Troubleshooting Guide

Troubleshooting High Meter Readings

Addresses causes and solutions for when meter readings are higher than expected.

Troubleshooting Low Meter Readings

Addresses causes and solutions for when meter readings are lower than expected.

Troubleshooting No Meter Output

Addresses causes and solutions for when no output signal is received from the meter.

Troubleshooting No Readout on Instrument

Addresses causes and solutions for when the readout instrument is not functioning correctly.

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