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Berthold Uni-Probe LB 491 - User Manual

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User’s Manual
ID-No. 38478BA2B
Rev.-No.: 01 27.5.08
Embedded Soft. Rev. 100
Device Description Rev. 03/04 HART
Device Description Rev. 01 PA
Device Description Rev. 01 FF
Process Control
detect and identify
Density Measurement
Uni-Probe LB 491
With All Supplements

Table of Contents

Questions and Answers

  • R
    Rachel HollandAug 2, 2025
    Why is the density reading fluctuating strongly on my Berthold Uni-Probe LB 491?
    • C
      castilloseanAug 2, 2025
      If the density reading on your Berthold Measuring Instruments fluctuates strongly, there could be several reasons: * The time constant might be too small. In this case, increase the time constant in the parameter menu to a minimum of 20 seconds. * The calibration might be wrong, so check the calibration values. * Rapid switch-over with too small Sigma value might be enabled. Disable rapid switch-over. * The count rate might be too low. Check the age of the source and irradiation level, and consider replacing the detector.
  • C
    Cory SalazarAug 9, 2025
    What to do if the count rate is too low on Berthold Uni-Probe LB 491?
    • T
      Tracy JohnstonAug 9, 2025
      If the count rate is too low on your Berthold Measuring Instruments, consider the following possible causes: 1. The shielding may not be opened or not correctly opened. Check the lock and secure it in the OPEN position. 2. The alignment of the useful beam toward the detector may not be correct. Correct and optimize the alignment. 3. There may be vessel installations in the path of radiation. Offset irradiation levels. 4. Wall deposits may have formed in the vessels. Remove wall deposits or perform a new calibration if the deposits cannot be removed. 5. The source may have reached the end of its service life. Renew the source (Co-60 after 5 to 10 years, at the earliest).
  • M
    Mr. Michael Stanley DDSAug 18, 2025
    Why does the density reading show drifts on my Berthold Measuring Instruments?
    • T
      Tina HarrisAug 18, 2025
      If your Berthold Measuring Instruments are showing drifts in the density reading, it could be due to: * A faulty detector stabilization: Replace the detector. * A faulty photomultiplier: Replace the multiplier.
  • M
    Mr. Kevin SheltonAug 25, 2025
    How to troubleshoot no signal on Berthold Uni-Probe LB 491 Measuring Instruments?
    • N
      Natalie HarrisAug 25, 2025
      If you are getting no signal from your Berthold Measuring Instruments, check the power supply and fuses. Also, check if LED 1 on the digital board is flashing, as the system might be out of work.

Summary

Uni-Probe Installation

General Information

Covers general safety precautions, product use, specific warnings, and radiation protection guidelines.

System Description

Details the Uni-Probe measuring system, hardware, principle, configuration, and technical specifications.

Installation

Provides instructions for transport, handling radioactive sources, installation methods, and detector protection.

Electrical Installation

Covers conduits, ATEX/FM/CSA connection types, terminals, switch settings, and wiring diagrams.

Repair, Maintenance and Service

Outlines safety, inspection, troubleshooting, and component replacement procedures.

Safety Manuals

Safety Instructions

General safety, operational, electrical, and radiation protection guidelines for personnel.

Transport and Assembly

Radiation Protection

Explains radiation safety principles, dose calculations, shutter testing, and emergency procedures.

Source Replacement

Details the procedure for replacing radioactive sources and managing radiation exposure.

Safety Instructions for the Types of Protection ATEX; FM; CSA

Specific safety guidelines for devices operating in ATEX, FM, and CSA hazardous environments.

HART Communicator User Interface

General Information on the HART Communicator

ACCESS TO SETUP

Grants access to editable instrument parameters via configuration, calibration, or service.

CONFIGURATION

PACTware User Interface FDT;DTM

Installing and Working with DTM

Guides users through installing PACTware™ and Device Type Managers (DTMs).

SIMATIC PDM User Interface HART

PC Connection to the Uni-Probe

General Information on SIMATIC PDM

Getting Started with SIMATIC PDM

Step-by-step guide covering software installation, authorization, and initial setup.

DEVICE Menu

Calibration with SIMATIC PDM

Outlines prerequisites and preparatory steps for calibrating the Uni-Probe using SIMATIC PDM.

One-Point Calibration

Error Handling

Details device error responses, handling modes, and corrective actions.

Working with SIMATIC PDM

FOUNDATION Fieldbus User Interface

Process Operation

Calibration with FOUNDATION Fieldbus

Error Handling

Covers device error responses, handling modes, and corrective actions for Fieldbus communication.

Berthold Uni-Probe LB 491 Specifications

General IconGeneral
BrandBerthold
ModelUni-Probe LB 491
CategoryMeasuring Instruments
LanguageEnglish

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