KRAL OMG Series - User Manual

Questions and Answers

J
Jennifer MillerAug 5, 2025
What to do if my KRAL OMG show no flow rate?
- J
  Joshua HuynhAug 5, 2025
  If your KRAL Measuring Instruments indicate no flow rate, several factors could be at play. It could be due to foreign particles obstructing the liquid or the flowmeter itself—try dismantling and cleaning the flowmeter, or using a commissioning filter. Insufficient inlet pressure could also be the culprit, so try increasing it. Alternatively, the flow rate might be too low; in this case, increase the flow rate, consider using a flowmeter with a suitable size, or implement linearization, while observing the operating instructions of the electronic equipment. Conversely, if the flow rate is too high, reduce the flow or use a flowmeter with a suitable size. Finally, airlocks can cause this issue, so deaerate the system and inspect for leaks.
D
dudleyjosephAug 12, 2025
Why are my KRAL Measuring Instruments showing unrealistic measured values?
- D
  derekpetersAug 12, 2025
  Unrealistic readings from your KRAL Measuring Instruments can stem from several causes. If the flow rate is too low, you can increase it, opt for a correctly sized flowmeter, or apply linearization, while observing the operating instructions of the electronic equipment. If the flow rate is too high, reduce it or choose a more appropriate flowmeter size. Airlocks can also lead to inaccurate measurements, so ensure you deaerate the system and check for any leaks.
D
Dr. Ricardo Thomas DDSAug 17, 2025
How to fix a leaking KRAL Measuring Instruments flowmeter?
- T
  Timothy BrownAug 17, 2025
  If your KRAL Measuring Instruments flowmeter is leaking, the cause might be a seal issue. It could be that the seal preload is too low, in which case you should preload the screws. Alternatively, the seal might be damaged, requiring you to replace it. Also, verify the chemical resistance of the seal to ensure it's appropriate for the application.
S
Susan LarsenAug 23, 2025
What to do if KRAL OMG Measuring Instruments flowmeter does not generate a pulse?
- A
  Andrea LivingstonAug 23, 2025
  If your KRAL Measuring Instruments flowmeter isn't generating a pulse, first check the pick-up connection and power supply, while observing the operating instructions of the pick up. If the connection is correct, the pick-up itself may be defective, so check its functionality, while observing the operating instructions of the pick up. Another potential cause is a destroyed dry sleeve, which would need to be replaced; contact the manufacturer for this.
M
Maria MillerAug 29, 2025
Why is there excessive pressure loss in KRAL OMG?
- S
  Sarah MurphyAug 29, 2025
  Excessive pressure loss in your KRAL Measuring Instruments could be due to the liquid's viscosity being too high. Try increasing the temperature, but be sure to stay within the specified temperature range.

KRAL OMG Series Specifications

General

Brand	KRAL
Model	OMG Series
Category	Measuring Instruments
Language	English

Summary

About this document

General information

Provides general information about the document and its purpose.

Target groups

Identifies the intended audience for the operating instructions.

Symbols

Explains the various danger levels and symbols used in the document.

Danger levels

Details the different danger levels and their consequences.

Danger signs

Explains the meaning and consequences of specific danger signs.

Safety

Proper use

Defines the correct usage of the flowmeter and its limitations.

Foreseeable misuse

Describes uses that are considered misuse of the product.

Associated documents

Lists other relevant documents for the product.

Identification

Obligations of the operator-owner

Outlines the responsibilities of the product's operator-owner.

Safety instructions

Provides fundamental safety instructions for operation.

Fundamental safety instructions

Lists essential safety rules to be strictly observed.

Type code

Explains the structure and meaning of the product's type code.

Technical data

Rating plate

Details the information found on the flowmeter's rating plate.

Operating limits

Specifies the permissible operating ranges for the flowmeter.

Pressure pulsation

Illustrates pressure pulsation effects on the flowmeter's service life.

Maximum values

Lists the maximum permissible values for various parameters.

Substitute operating data

Provides standardized values for flow rate, temperature, and viscosity.

Sound pressure level

States the sound pressure level of the flowmeters.

Dimensions and weights

Provides dimensional drawings and weight data for pipe thread connections.

Pipe thread (BSPP thread)

Details dimensions and weights for BSPP threaded connections.

DIN flange

Provides dimensional drawings and weight data for DIN flange connections.

Pressure bearing capacity

Details pressure bearing capacity for various flowmeter models.

Pressure bearing capacity OMG-013

Graphs showing pressure bearing capacity for the OMG-013 model.

Pressure bearing capacity OMG-020

Graphs showing pressure bearing capacity for the OMG-020 model.

Pressure bearing capacity OMG-032

Graphs showing pressure bearing capacity for the OMG-032 model.

Pressure bearing capacity OMG-052

Graphs showing pressure bearing capacity for the OMG-052 model.

Pressure bearing capacity OMG-068

Graphs showing pressure bearing capacity for the OMG-068 model.

Pressure bearing capacity OMG-100

Graphs showing pressure bearing capacity for the OMG-100 model.

Pressure bearing capacity OMG-140

Graphs showing pressure bearing capacity for the OMG-140 model.

Function description

Structure

Illustrates and labels the internal components of the flowmeter.

Functional principle

Explains how the rotating displacement meter operates.

Rolling bearings

Details the types of rolling bearings used in the flowmeter.

Signal generation

Explains how the flowmeter generates output signals and the K-factor.

Linearization

Describes how to achieve higher measuring precision using linearization.

Temperature compensation

Explains temperature compensation for standardized volume measurement.

Recognition of flow direction

Details how the flow direction is recognized using additional sensors.

Transportation, storage

Dangers during transportation

Highlights safety instructions and dangers during transportation.

Dangers during storage

Provides safety instructions and dangers related to storage.

Unpacking and checking the state of delivery

Instructions for unpacking and inspecting the received flowmeter.

Transporting flowmeters

Gives warnings and precautions for safely transporting flowmeters.

Storing the flowmeter

Provides guidelines for storing the flowmeter correctly.

Preservation

Preservation table

Lists conditions requiring additional preservation for the flowmeter.

Preserving the inner surfaces

Details the personnel and equipment needed for preserving inner surfaces.

Preserving the outer surfaces

Provides steps for preserving the outer surfaces of the flowmeter.

Removing the preservation

Details the procedure and precautions for removing preservation.

Installation, removal

Dangers during installation

Lists safety instructions and dangers related to flowmeter installation.

Dangers during removal

Lists safety instructions and dangers related to flowmeter removal.

Installing the flowmeter

Covers the process of installing the flowmeter.

Protecting the flowmeter against soiling

Recommendations to protect the flowmeter from soiling during installation.

Installation types

Describes different possible installation positions and flow directions.

Installation recommendation

Provides recommendations to avoid measuring errors during installation.

Recommendations for alternative installation variants

Illustrates alternative installation variants and potential error sources.

Installing the flowmeter

Details personnel qualifications and precautions for installation.

Removing the flowmeter

Provides safety instructions and steps for removing the flowmeter.

Connection

Dangers during connection work

Highlights safety instructions and dangers during connection work.

Connecting the flowmeter to the pipe system

Details the process and precautions for connecting the flowmeter to the pipe system.

Connecting the pick up

Explains how to connect the pick-ups for flow direction recognition.

Operation

Dangers during operation

Lists safety instructions and dangers that must be observed during operation.

Commissioning

Covers the steps for commissioning the flowmeter.

Cleaning the pipe system

Provides instructions for cleaning the pipe system before commissioning.

Checking the function

Lists checks to perform for verifying the flowmeter's function.

Commissioning the flowmeter

Details attention points and requirements for commissioning the flowmeter.

Decommissioning

Covers the process of decommissioning the flowmeter.

Switching off the flowmeter

Explains how to switch off the flowmeter safely.

Recommissioning

Provides guidance for recommissioning the flowmeter.

Recommissioning the flowmeter

Details attention points for recommissioning the flowmeter.

Maintenance

Required maintenance

Discusses the maintenance-free nature and potential wear of flowmeters.

Maintaining flowmeters

Lists signs of wear and troubleshooting steps for maintaining flowmeters.

Recalibration of the flowmeter

Recommends recalibration intervals and procedures for high precision.

Servicing

Dangers during servicing

Lists safety instructions and dangers to observe during servicing.

Replacing seals and ball bearings

Details the process for replacing seals and ball bearings.

Removing seals and ball bearings OMG-013

Step-by-step guide to remove seals and ball bearings from OMG-013.

Installing seals and ball bearings OMG-013

Step-by-step guide to install seals and ball bearings for OMG-013.

Removing seals and ball bearings OMG-020;OMG-032

Guide to remove seals and ball bearings for OMG-020/OMG-032.

Installing seals and ball bearings OMG-020;OMG-032

Guide to install seals and ball bearings for OMG-020/OMG-032.

Removing seals and ball bearings OMG-052;OMG-068

Guide to remove seals and ball bearings for OMG-052/OMG-068.

Installing seals and ball bearings OMG-052;OMG-068

Guide to install seals and ball bearings for OMG-052/OMG-068.

Removing seals and ball bearings OMG-100;OMG-140

Guide to remove seals and ball bearings for OMG-100/OMG-140.

Installing seals and ball bearings OMG-100;OMG-140

Guide to install seals and ball bearings for OMG-100/OMG-140.

Disposal

Dangers during disposal

Lists safety instructions and dangers during disposal.

Dismantling and disposing of the flowmeter

Provides steps and safety precautions for dismantling and disposing of the flowmeter.

Troubleshooting

Possible faults

Lists common faults, their causes, and troubleshooting measures.

Troubleshooting

Provides a detailed table of faults, causes, and remedies.

Spare parts

Overview OMG-013

Provides an exploded view and parts list for the OMG-013 model.

Overview OMG-020;OMG-032

Provides an exploded view and parts list for OMG-020/OMG-032 models.

Overview OMG-052;OMG-068

Provides an exploded view and parts list for OMG-052/OMG-068 models.

Overview OMG-100;OMG-140

Provides an exploded view and parts list for OMG-100/OMG-140 models.

Accessories

Heating

Details options for heating systems for the flowmeter.

Possible types of heating

Describes different types of heating systems available for the flowmeter.

Technical data of the electrical heating system

Provides technical specifications for electrical heating systems.

Technical data of the fluid heating system

Provides technical specifications for fluid heating systems.

Installing the heating system

Instructions for installing the electrical heating system.

Installing the fluid heating system

Instructions for installing fluid heating systems and trace heating.

Junction box

Explains the function and technical data of the junction box.

Function description

Describes the purpose of the junction box for sensor connections.

Technical data

Lists technical specifications for different junction box models.

Installing the junction box

Provides instructions for installing the junction box.

Extension cable

Details the function, technical data, and connection of extension cables.

Function description

Explains the function of extension cables for sensors.

Technical data

Provides technical specifications for extension cables.

Connecting the extension cable

Instructions for connecting extension cables.

Appendix

Tightening torques for screws with metric screw threads with and without wedge lock washers

Provides tightening torques for metric screw threads.

Tightening torques for screw plugs with thread measured in inches and elastomer seal

Provides tightening torques for inch-threaded screw plugs.

Tightening torques and widths for threaded rings

Lists tightening torques and widths for threaded rings.

Contents of the Declaration of Conformity

Lists directives observed by the machinery.

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Table of Contents

Questions and Answers

KRAL OMG Series Specifications

Summary

About this document

General information

Target groups

Symbols

Danger levels

Danger signs

Safety

Proper use

Foreseeable misuse

Associated documents

Identification

Obligations of the operator-owner

Safety instructions

Fundamental safety instructions

Type code

Technical data

Rating plate

Operating limits

Pressure pulsation

Maximum values

Substitute operating data

Sound pressure level

Dimensions and weights

Pipe thread (BSPP thread)

DIN flange

Pressure bearing capacity

Pressure bearing capacity OMG-013

Pressure bearing capacity OMG-020

Pressure bearing capacity OMG-032

Pressure bearing capacity OMG-052

Pressure bearing capacity OMG-068

Pressure bearing capacity OMG-100

Pressure bearing capacity OMG-140

Function description

Structure

Functional principle

Rolling bearings

Signal generation

Linearization

Temperature compensation

Recognition of flow direction

Transportation, storage

Dangers during transportation

Dangers during storage

Unpacking and checking the state of delivery

Transporting flowmeters

Storing the flowmeter

Preservation

Preservation table

Preserving the inner surfaces

Preserving the outer surfaces

Removing the preservation

Installation, removal

Dangers during installation

Dangers during removal

Installing the flowmeter

Protecting the flowmeter against soiling

Installation types

Installation recommendation

Recommendations for alternative installation variants

Installing the flowmeter

Removing the flowmeter

Connection

Dangers during connection work

Connecting the flowmeter to the pipe system

Connecting the pick up

Operation

Dangers during operation

Commissioning

Cleaning the pipe system

Checking the function

Commissioning the flowmeter

Decommissioning

Switching off the flowmeter

Recommissioning