Limaco ULM-31-HF - User Manual

Questions and Answers

P
patrick02Aug 5, 2025
How to troubleshoot no 4-20mA signal from Limaco ULM-31-HF Transmitter?
- K
  kwoodsAug 5, 2025
  If the 4-20mA signal is not being delivered, check the transmitter's power supply and electrical connections to ensure they meet specifications. If abnormalities are found, correct them. Also, verify the 4-20mA output electrical connection isn't broken or has excessive line resistance; reconnect the line or reduce the load if needed. If these steps don't resolve the issue, the transmitter electronic unit may have failed, and the device should be returned for repair.
W
williamsryanAug 20, 2025
Why is the Limaco Transmitter 4-20mA signal inconsistent with the actual value?
- L
  Luis ReedAug 20, 2025
  If the 4-20mA signal is inconsistent with the actual value of the controlled parameter, it could be due to a failure in the level transmitter's electronic unit. Check the current signal functioning using emulation. If the electronic unit is operating correctly, record the spectrum and send it to technical support for further recommendations. If there is an inconsistency, return the device for repair.
N
nberryAug 28, 2025
How to fix no RS-485 connection on Limaco ULM-31-HF Transmitter?
- L
  Lauren PetersonAug 28, 2025
  If there is no RS-485 connection, but the 4-20mA signal is being delivered and the communication line is operating properly, the issue might be with the PC's configuration. Check the converter function in the Device Manager and set the converter as required. Also, verify that the transmitter's Modbus address is correctly set and that there are no address conflicts with other transmitters on the line. Ensure the correct transmitter number is indicated in the Configurator software. Finally, check if any other applications are using the COM-port; if so, switch them off and restart the PC if necessary.
T
Timothy YuNov 12, 2025
What to do if Limaco Transmitter 4-20mA signal corresponds to alarm values?
- T
  Tyler AndersonNov 12, 2025
  If the 4-20mA signal corresponds to alarm values, it may be due to controlled parameters exceeding permissible values. Connect to the transmitter via PC or Bluetooth to check if the alarm signal value matches its mask. Other potential causes include: - Transmitter temperature beyond range: Remove the source of overheating, insulate the transmitter, use forced-air cooling, or install a sun shield. - Lack of transmitter perpendicularity: Correct by leveling the device. - Unreliable temperature or tilt angle measurement: The related channels in the electronic module may be faulty. Overheat prevention is necessary, or the device should be returned for repair. - Product surface disturbance: Further operation is allowed. - Transient conditions: Wait 1-2 minutes after switching on. If the issue ...

Summary

1 DOCUMENT DETAILS

1.1 Document Purpose

Overview of manual content for installation, connection, commissioning, and troubleshooting.

1.2 Target Group

Manual intended for trained personnel involved in installation, commissioning, diagnostics, and servicing.

1.3 Symbolic Notations

Explanation of symbols used for caution, warning, and notes in the manual.

2 BASIC SAFETY REGULATIONS

2.1 Personnel Requirements

Emphasizes training, permits, and PPE for personnel operating the device.

2.2 Product Purpose

Defines the level transmitter's function for contactless measurement of liquids and bulky products.

2.3 Operational Safety

Highlights safety guidelines and prohibits unauthorized modifications to the device.

2.4 General Safety Guidelines

Covers compliance with standards, low emission power, safety, and explosion-proof usage.

2.5 Environmental Safety

Importance of adhering to packaging, transportation, storage, and disposal for environmental protection.

3 PRODUCT DESCRIPTION

3.1 Scope of Supply

Lists all items included in the product package: transmitter, software, documentation, and certificates.

3.2 Product Design Overview

Illustrates the physical components and layout of the level transmitter.

3.3 Product Identification Methods

Details methods for identifying the device via nameplate, certificate, or serial number.

3.4 Operating Principle

Explains the radar measurement technology and the level calculation formula.

3.5 Packaging, Transportation, and Storage

Guidelines for safe packaging, transport, and specified storage conditions.

4 INSTALLATION

4.1 Installation Position Selection

Recommendations for optimal installation location to ensure accurate measurements.

4.2 Mounting Pipe Branch Requirements

General requirements for installing on mounting pipe branches, including dimensions.

4.3 Mounting Pipe Branches

Specifies pipe branch requirements based on application type (strong/low reflected signal).

4.4 Measuring Beam Zone of Action

Defines the transmitter's radio beam area and how its diameter is determined.

4.5 Dead Zone Explanation

Describes the "dead zone" near the antenna where measurements are difficult or impossible.

4.6 Installation Examples and Errors

Illustrates correct and incorrect installation scenarios for level transmitters.

4.7 Tank Structures Impact

Discusses how internal tank structures can affect signal propagation and measurement.

5 ELECTRICAL CONNECTIONS

5.1 General Connection Guidelines

Safety warnings and fundamental rules for performing electrical connections.

5.2 Connection Cable Specifications

Details on selecting appropriate cables for signal integrity and IP rating.

5.3 Shielding and Grounding

Proper methods for shielding cables and grounding the device for safety and performance.

5.4 Terminal Functions and Connection Diagrams

Explains terminal purposes and provides wiring diagrams for various models.

5.5 Power Supply Requirements

Specifies the recommended DC voltage and current for the power supply unit.

5.6 Device Connection Procedure

Step-by-step guide for connecting the level transmitter, including pre-connection checks.

6 INITIAL SETTING AND COMMISSIONING

6.1 Level Transmitter Address Setting

How to configure the Modbus address using DIP switches or software.

6.2 PC Connection via RS-485

Instructions for establishing PC communication using the RS-485 interface and converters.

6.3 Parameter Setting via PC;RS-485

Utilizing the CONFIGURATOR software for setting transmitter parameters remotely.

6.4 4-20 mA Output & Alarm Signals

Configuring the 4-20mA output and setting alarm signal parameters.

6.5 Relay Signal Setting

Configuring relay outputs based on measurement values and status criteria.

6.6 Bluetooth Communication

Explains the use of the Bluetooth interface for wireless setup and data retrieval.

7 DEVICE OPERATION INFORMATION

7.1 Device Diagnostics

Using the Configurator's diagnostics tab to monitor transmitter performance and status.

7.2 Output Signal Emulation

How to enable emulation mode for testing the output signal and device operation.

7.3 Snapshots for Analysis

Capturing and analyzing operational data using "Snapshots" files for optimization.

8 TROUBLESHOOTING

8.1 Signal 4-20 mA Delivery Issues

Diagnosing and resolving problems related to the 4-20mA signal not being delivered.

8.2 4-20 mA Alarm Value Issues

Troubleshooting when the 4-20mA signal indicates alarm conditions or is out of range.

8.3 Inconsistent 4-20 mA Signal

Addressing discrepancies between the 4-20mA signal and actual controlled parameters.

8.4 RS-485 Connection for 4-20 mA Signal

Resolving issues related to RS-485 connection for the 4-20mA signal.

8.5 RS-485 and COM-Port Issues

Troubleshooting RS-485 connectivity, driver installation, and COM-port conflicts.

10 DISMANTLING

10.1 Dismantling Procedure

Step-by-step guide for safely dismantling the device according to safety regulations.

10.2 Disposal Guidelines

Information on the device casing's recyclability and proper disposal methods.

12 ANNEXES

12.1 General Specifications

Technical data including materials, dimensions, analog, digital, and wireless output specifications.

12.2 ULM-31 A1-HF-F-LC 2-Wire Specs

Specific technical details and operating conditions for the 2-wire option.

12.3 Mounting Dimensions (No Flange)

Shows external dimensions of the transmitter when not using a mounting flange.

12.4 Flange Connection Details

Illustrates how to connect the transmitter to a mounting flange using screws.

12.5 Stub Tube Mounting: ULM-31 A1

Provides dimensions for mounting the ULM-31A1 at various stub tube sizes.

12.6 Stub Tube Mounting: ULM-31-HF-F Series

Provides dimensions for mounting ULM-31-HF-F series models at stub tubes.

12.7 Stub Tube Mounting: ULM-31-HF Series

Provides dimensions for mounting ULM-31-HF series models at stub tubes.

12.8 Stub Tube Mounting with Spacer: ULM-31 A1

Details dimensions for mounting ULM-31A1 with an insulating spacer.

12.9 Stub Tube Mounting with Spacer: ULM-31-HF-F Series

Details dimensions for mounting ULM-31-HF-F series with an insulating spacer.

12.10 Mounting with Clamping Flange & Spacer

Illustrates mounting using a clamping flange and insulating spacer.

12.11 Mounting with Clamping Flange & Spacer

Details mounting ULM-31-HF series with a clamping flange and insulating spacer.

12.12 Small Stub Tube Mounting with Reducing Piece

Provides dimensions for mounting at small diameter stub tubes with a reducing adapter.

12.13 Sealing Procedures

Instructions for applying sealing compounds or gaskets to prevent moisture ingress.

12.14 Mounting Flange Specifications

Technical drawing and dimensions for the standard mounting flange.

12.15 Level Transmitter Structure

Exploded view showing all the individual components of the level transmitter.

Limaco ULM-31-HF Specifications

General

Brand	Limaco
Model	ULM-31-HF
Category	Transmitter
Language	English

Related product manuals

Limaco ULM-31A1-HF

84 pages

Limaco ULM-31A1-HF-F