TFA Dostmann LT-102 Professional Digital Thermometer Instruction Manual

1. Introduction

The TFA Dostmann LT-102 is a professional digital thermometer designed for accurate temperature monitoring in various applications, including refrigerators, freezers, and liquids. It features a waterproof cable sensor and is compliant with HACCP and EN 13485 standards, making it suitable for professional use in industry, trade, and laboratories.

This manual provides essential information for the safe and effective use of your LT-102 thermometer. Please read it thoroughly before operation and retain it for future reference.

2. Safety Information

• Read the instruction manual carefully before using the device.
• The device is not a toy. Keep it out of reach of children.
• Do not expose the device to extreme temperatures, vibrations, or shocks.
• Avoid direct sunlight.
• Do not immerse the main unit in water. The cable sensor is waterproof (IP65), but the display unit is jet-protected, not submersible.
• Only use the specified battery type (1 x CR2032). Ensure correct polarity.
• Remove the battery if the device will not be used for an extended period.
• Dispose of batteries and the device responsibly, according to local regulations.

3. Package Contents

Verify that all components are present and in good condition:

• TFA Dostmann LT-102 Digital Thermometer (main unit)
• Waterproof Cable Sensor (approx. 300 cm length)
• 1 x CR2032 Battery (pre-installed or separate)
• Instruction Manual

4. Product Features

• Digital display of current temperature.
• Records maximum and minimum temperature values.
• HOLD function to freeze the current reading.
• Optical and acoustic HI/LO alarm for user-defined temperature limits.
• Waterproof cable sensor (IP65).
• Main unit jet-protected (IP65) for easy cleaning.
• Compliant with HACCP and EN 13485 standards.
• Versatile mounting options: integrated stand and magnetic attachment.

5. Device Layout and Controls

Familiarize yourself with the main components and buttons of your thermometer:

Figure 5.1: Front View of the LT-102 Thermometer. This image displays the main unit with its large digital screen, showing a temperature reading of 23.1°C. Below the screen are four circular buttons: Power, MAX/MIN, AL SET, and +1. The waterproof cable sensor is visible extending from the right side of the unit.

• Display: Shows current temperature, MAX/MIN values, and alarm indicators.
• Ⓞ (Power) Button: Turns the device ON/OFF.
• MAX/MIN Button: Toggles between current, maximum, and minimum temperature readings. Press and hold to reset MAX/MIN values.
• AL SET Button: Used to set high and low temperature alarms.
• +1 Button: Used to adjust values when setting alarms.
• Cable Sensor: Waterproof probe for temperature measurement.

Figure 5.2: Back View of the LT-102 Thermometer. This image shows the rear of the thermometer, highlighting the integrated foldable stand and the circular magnetic attachment point. Regulatory markings and model information are also visible.

6. Setup

6.1 Battery Installation

The device uses one CR2032 button cell battery. If the display is blank or dim, replace the battery.

1. Locate the battery compartment on the back of the unit.
2. Open the compartment cover (you may need a small screwdriver or coin).
3. Insert a new CR2032 battery with the positive (+) side facing up.
4. Close the battery compartment cover securely.

6.2 Initial Placement and Sensor Connection

Connect the cable sensor to the main unit if it is not already connected. The sensor plug is designed for a secure fit.

Figure 6.1: Sensor Cable Connection. This image shows the LT-102 thermometer from an angled perspective, clearly illustrating the white cable sensor plugged into the side of the main unit. The sensor probe itself is metallic and waterproof.

Position the main unit using the integrated stand for desktop use or attach it to metallic surfaces using the magnet on the back. Place the waterproof cable sensor in the area where temperature measurement is required (e.g., inside a refrigerator, freezer, or submerged in liquid).

7. Operation

7.1 Power ON/OFF

• Press the Ⓞ (Power) button once to turn the thermometer ON.
• Press and hold the Ⓞ (Power) button for approximately 3 seconds to turn the thermometer OFF.

7.2 Current Temperature Display

Upon powering on, the device will immediately display the current temperature measured by the cable sensor.

7.3 MAX/MIN Temperature Function

The thermometer records the highest (MAX) and lowest (MIN) temperatures measured since the last reset.

• Press the MAX/MIN button once to display the maximum temperature recorded.
• Press the MAX/MIN button again to display the minimum temperature recorded.
• Press the MAX/MIN button a third time to return to the current temperature display.
• To reset the MAX/MIN values, press and hold the MAX/MIN button for approximately 3 seconds while viewing either MAX or MIN temperature. The display will briefly show "---" indicating reset.

7.4 HOLD Function

The HOLD function allows you to freeze the current temperature reading on the display.

• While displaying the current temperature, press the +1 button once to activate the HOLD function. The display will show "HOLD".
• Press the +1 button again to deactivate HOLD and return to live temperature readings.

8. Alarm Settings

The LT-102 features adjustable high (HI) and low (LO) temperature alarms. An optical and acoustic alarm will activate if the temperature exceeds the HI limit or falls below the LO limit.

1. Press the AL SET button once. The "HI" icon will flash, and the current high alarm limit will be displayed.
2. Use the +1 button to adjust the HI alarm limit. Each press increases the value. Press and hold for faster adjustment.
3. Press the AL SET button again. The "LO" icon will flash, and the current low alarm limit will be displayed.
4. Use the +1 button to adjust the LO alarm limit.
5. Press the AL SET button a third time to confirm the settings and exit alarm setting mode. The alarm icons will appear on the display, indicating that alarms are active.
6. To deactivate alarms, press and hold the AL SET button for approximately 3 seconds. The alarm icons will disappear. Repeat the process to reactivate.

9. Maintenance and Cleaning

The LT-102 thermometer is designed for durability and easy maintenance.

• Cleaning: The main unit is jet-protected (IP65) and the cable sensor is waterproof (IP65). Both can be cleaned under running water or wiped with a damp cloth. Do not use abrasive cleaners or solvents. Ensure the battery compartment is securely closed before cleaning the main unit with water.
• Storage: Store the device in a dry place, away from extreme temperatures and direct sunlight, when not in use.
• Battery Replacement: Replace the CR2032 battery when the display becomes dim or unresponsive.

10. Troubleshooting

11. Specifications

Figure 11.1: LT-102 Dimensions. This image shows the thermometer held in a hand, with arrows indicating its approximate dimensions: 8.7 cm length, 5.7 cm height, and 1.7 cm width.

12. Warranty and Support

TFA Dostmann products are manufactured with quality and precision. For warranty information or technical support, please refer to the warranty card included with your purchase or visit the official TFA Dostmann website. Please retain your proof of purchase for any warranty claims.

Manufacturer: TFA Dostmann, Zum Ottersberg 12, 97877 Wertheim am Main, Germany.