Reassembly, Reinstalling the LCD Assembly

51, 52, 53, 54 Series II

Service Manual

6.The LCD decal is now exposed and may be removed.

7.To remove the main switch pad, first remove the small elastomeric connector at the top of the switch pad, and then lift out the entire switch pad.

Reassembly

The reassembly procedure is basically the reverse of the disassembly procedure.

However, there are several points in this process that should be explained further.

Note

For reassembly, the thermometer top case should be face down, with the keypad end of the top case facing the user.

Reinstalling the LCD Assembly

Follow these steps to reinstall the LCD assembly:

1.Install the LCD decal.

2.When putting the LCD back into the top case, make sure the LCD is correctly aligned. The edge of the LCD with the bubble in it should be facing the left side of the open, face down top case, and the LCD should be placed into the top case face down.

3.When reinstalling the backlight, the backlight pins should be on the left side of the open top case and they should be facing up. Check that the pins are straight. To make sure that the backlight is centered, line up the bottom left corner of the backlight with the guide that is molded into the top case. The left corner of the backlight should fit directly over this guide and the bottom right side of the backlight should also be lined up with (but not over) a similar guide on the right side of the open top case.

4.Install the two LCD elastomeric connectors.

Rebuilding the Main PCA

When reinstalling the Main PCA, make sure that the Isothermal PCA and the IR Lens are attached to each other first. To do this, follow these directions:

1.Turn the Main PCA over so that the components are face down.

2.Attach the Isothermal PCA to the Main PCA by inserting the pins into the matching holes on the Main PCA.

Note

When putting the Isothermal PCA back onto the Main PCA, do not push the Isothermal PCA all the way down into the contact holes of the Main PCA. If the Isothermal PCA is kept slightly loose, it makes installation of the IR Lens easier.

3.Reinstall the IR Lens by taking the Main PCA (with the Isothermal PCA loosely attached), and with the component side facing down; slide the IR Lens in between the main board and the Isothermal PCA.

4.Line up the tab on the Isothermal PCA and the notch in the IR Lens and push the two together. The contacts of the IR Lens should slide under the Isothermal PCA and they should be making contact with pads on the underside of the Isothermal PCA.

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.