Fluke 51, 54, 52, 53 Basic Maintenance, Cleaning the Thermometer, Changing the Batteries

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51, 52, 53, 54 Series II

Service Manual

Basic Maintenance

Basic maintenance required by the thermometer is discussed in this section.

Cleaning the Thermometer

Caution

∙To avoid damaging the thermometer, do not use aromatic hydrocarbons or chlorinated solvents for cleaning. These solutions react with the plastics used in the thermometer.

∙Do not allow the LCD to get wet.

∙Do not remove any of the lubricant from the battery/pca connection.

Clean the thermometer case with a mild detergent and water.

The pca may be washed with isopropyl alcohol or deionized water and a soft brush. Dry the pca with clean dry air at low pressure, then bake it at +50 oC (+122 oF) for 24 hours.

Changing the Batteries

WWarning

∙Replace the batteries as soon as the low battery indicator (B) appears. The possibility of false readings increases when the batteries are low. False readings can lead to personal injury.

∙To avoid electrical shock, disconnect the thermocouple(s) before opening the battery door.

Caution

∙Do not attempt to recharge the batteries.

∙Do not dispose of the batteries by placing them in fire.

∙Follow local laws or regulations when disposing of batteries.

∙Match the positive (+) and negative (-) polarities of the batteries with the markings located on the case.

To replace the batteries, refer to Figure 5 and use the following procedure:

1.Turn the thermometer off.

2.Loosen the battery compartment door screw and remove the battery door.

3.Replace the three AA batteries. To simplify battery installation, put the new batteries into the unit positive end first.

4.Replace the battery compartment door and tighten the screw.

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Contents 51, 52, 53, 54 Series Limited Warranty & Limitation of Liability Table of Contents 51, 52, 53, 54 Series List of Tables 51, 52, 53, 54 Series List of Figures 51, 52, 53, 54 Series 51, 52, 53, 54 Series IntroductionService Centers International SymbolsPrecautions and Safety Information International Electrical Symbols Used in this ManualSafety Information WWarning ThermometerSpecifications General SpecificationsEnvironmental ElectricalDisplay Test Performance Test and Calibration Required Test EquipmentPerformance Tests Wide Range Performance Test Procedure Keypad TestIce Bath Test Temperature Verification of IR Communications Port Fluke 53Calibration and Offset Adjustment CalibrationMenu on the display changes to CAL A-d Reference Junction Calibration Changing the Batteries Basic MaintenanceCleaning the Thermometer Disassembly and Reassembly DisassemblyReassembly Reinstalling the LCD AssemblyReplaceable Parts Number Replaceable Parts Fluke Part Qty Description ModelNumber Qty Fluke Part NumberReplaceable Parts Description Model NumberExploded View Model 54 is Shown 51, 52, 53, 54 Series Index 51, 52, 53, 54 Series
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51, 52, 53, 54 specifications

The Fluke 51 is a high-precision digital thermometer designed for industrial and laboratory applications, offering accurate temperature measurements across a wide range of environments. With its robust build and advanced features, the Fluke 51 is a tool of choice for field technicians and engineers.

The Fluke 51 boasts an impressive temperature measurement range, typically from -200°C to 1372°C (-328°F to 2500°F), making it suitable for various applications, including HVAC, food processing, and scientific experimentation. One of its standout characteristics is its thermocouple compatibility, supporting multiple thermocouple types such as J, K, T, E, N, R, S, and B. This versatility allows users to select the appropriate sensor for their specific temperature requirements, enhancing measurement accuracy.

A key feature of the Fluke 51 is its fast response time, allowing users to obtain readings within seconds, which is essential for time-sensitive applications. The device is equipped with a large, easy-to-read LCD display that shows clear numerical values, ensuring users can read measurements from a distance or in difficult lighting conditions. Additionally, the display includes a hold function, enabling users to freeze the reading for easier observation.

In terms of data management, the Fluke 51 provides the option to store and recall temperature readings, facilitating efficient documentation and analysis. Its rugged design, resistant to dust and moisture, makes it suitable for use in demanding environments, ensuring durability and longevity.

The Fluke 51 is powered by standard AA batteries, giving it an extended operational lifespan. It also features a low battery indicator, helping users to manage power effectively and avoid unexpected downtime. The device is compact and lightweight, fitting comfortably in the hand and allowing for easy transport.

Another important aspect is its user-friendly interface, which includes intuitive buttons for quick navigation through settings and options. This design consideration enhances usability, allowing even novice users to operate the thermometer efficiently.

In summary, the Fluke 51 digital thermometer combines precision, durability, and ease of use, making it an essential tool in various professional settings. With its wide temperature range, thermocouple compatibility, fast response time, and robust design, the Fluke 51 is positioned as a reliable instrument for accurate temperature measurements wherever the task may take you.
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