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Thermo Scientific Locator 4 Plus - User Manual

Thermo Scientific Locator 4 Plus
30 pages
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User Manual
Locator and Locator Plus
Cryogenic Storage Vessel with or without
Ultrasonic Level Monitor
Operation Manual and Parts List LT509X9 (7018141) Rev. 4

Table of Contents

Questions and Answers

  • S
    Samuel LewisAug 6, 2025
    Why does the Thermo Scientific Locator 4 Plus level monitor alarm sound intermittently?
    • S
      Sharon DavisAug 6, 2025
      The intermittent alarm and incorrect liquid level measurement in your Thermo Scientific Laboratory Equipment are likely due to ice or frost buildup on the transducer. To resolve this, remove the cover with the monitor from the vessel and let it sit at room temperature for about two hours, or until no ice is visible on the transducer or tube. Do not use a heat gun, as it can damage the cork. Ensure the lid stands upright on the cork to allow moisture to drain. Wipe moisture from the tube's inside and transducer's face with a clean, soft cloth. Then, replace the cover with the monitor and press the “Reset” button.
  • B
    Barry DunnAug 20, 2025
    What to do if Thermo Scientific Laboratory Equipment level monitor reads 'Full' after replacing the lid?
    • B
      Brandon AriasAug 20, 2025
      If your Thermo Scientific Laboratory Equipment's level monitor reads 'Full' after you replace the lid, it's probably due to fog in the top part (neck area) of the cryogenic vessel. The density of this fog depends on the room's humidity. The fog should dissipate in about fifteen minutes, after which the level monitor will provide an accurate reading of the liquid nitrogen level.

Summary

Section 1 Safety Information

Reading the Manual

Instructions to read manual carefully for safe operation and understanding.

Critical Safety Warnings

Important safety precautions regarding trained personnel, liquid nitrogen hazards, and PPE.

Operational Cautions

Specific warnings about power supply, overfilling, rack handling, vacuum port, and vessel orientation.

Section 4 Operation

Operational Safety Cautions

Warnings about overfilling, rack handling, and spilling liquid nitrogen on the vacuum port.

Liquid Nitrogen Filling Procedure

Step-by-step procedure for adding liquid nitrogen to a new or warm vessel.

Measuring Liquid Nitrogen Levels

Section 6 Liquid Nitrogen Level Monitor Operation

Level Monitor Installation

Remote Alarm Functionality

How the LN2 level monitor alerts to low levels and connects to a remote alarm system.

Connecting to Remote Alarm Systems

Ultrasonic Level Sensing Principles

Explanation of how ultrasonic sound waves are used to sense LN2 levels.

Microprocessor Display and Functions

Alarm System Indicators

Details on how low level indicators, audible, and visual alarms function.

Microprocessor Reset Safety Feature

Level Monitor Initial Setup and Operation

Section 7 LN2 Level Monitor Troubleshooting and Parts List

Thermo Scientific Locator 4 Plus Specifications

General IconGeneral
BrandThermo Scientific
ModelLocator 4 Plus
CategoryLaboratory Equipment
LanguageEnglish

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