1. Introduction
The Fluke 51 II Single Input Digital Thermometer is designed for precise temperature measurements across a broad range of applications, including industrial settings such as furnaces, kilns, and freezers. This device supports various thermocouple probe types (Type K, J, T, or E) and displays measurements in Celsius, Fahrenheit, or Kelvin. It comes equipped with a Type K bead thermocouple probe, featuring a 40-inch cable, capable of measuring temperatures from -40 to +260 degrees C (-40 to +500 degrees F).
Key Features:
- Broad Temperature Range: Suitable for diverse industrial applications requiring wide temperature measurement capabilities.
- Multiple Thermocouple Support: Compatible with Type K, J, T, or E thermocouple probes for versatile use.
- Included Probe: Ships with a Type K bead thermocouple probe (40-inch cable) for immediate use.
- Min/Max/Average Readings: Provides relative time of minimum, maximum, and average temperature measurements for effective monitoring.
- NIST Standards Compliance: Conforms to NIST standards, ensuring accuracy and regulatory compliance.
Figure 1: Fluke 51 II Single Input Digital Thermometer. This image shows the front view of the yellow and black handheld thermometer with its digital display and control buttons.
2. Setup
2.1 Battery Installation
The Fluke 51 II requires three AA batteries for operation. Ensure batteries are installed correctly according to polarity markings inside the battery compartment. The battery compartment is typically located on the rear of the device and secured with a screw or latch.
2.2 Connecting the Thermocouple Probe
- Locate the thermocouple input jacks on the top of the thermometer. The Fluke 51 II has a single input.
- Align the polarized plug of your Type K bead thermocouple probe with the corresponding jack.
- Gently insert the probe plug into the jack until it is securely seated. Ensure a firm connection for accurate readings.
Video 1: Overview of Fluke 50 Series II Thermometers. This video demonstrates the connection of a thermocouple probe to a Fluke thermometer and highlights various operational features such as viewing min/max/average temperatures and data logging capabilities. While the video shows a Fluke 53 II, the connection and basic operational principles apply to the Fluke 51 II model.
3. Operation
3.1 Powering On/Off
Press the green power button (ⓘ) to turn the thermometer on. Press and hold the power button to turn it off.
3.2 Taking Temperature Measurements
- Ensure the thermocouple probe is securely connected.
- Place the tip of the thermocouple probe in contact with the object or environment whose temperature you wish to measure.
- The current temperature reading will be displayed on the large backlit LCD screen.
3.3 Changing Temperature Units (℃/℉/K)
Press the ℃/℉/K button to cycle through Celsius, Fahrenheit, and Kelvin temperature units.
3.4 Min/Max/Average Function
The Fluke 51 II can track minimum, maximum, and average temperature readings over a period. Press the MIN/MAX button to activate this function. Subsequent presses will cycle through minimum, maximum, and average values, along with their respective time references. Press CANCEL to exit this mode.
3.5 Data Hold Function
To freeze the current temperature reading on the display, press the HOLD button. Press it again to release the hold and resume live readings.
3.6 Electronic Offset Function
The thermometer features an electronic offset function to compensate for thermocouple errors, ensuring maximum accuracy. Refer to the detailed manual for specific calibration procedures if required.
4. Maintenance
4.1 Cleaning
To maintain the device, wipe the exterior clean with a damp cloth. Do not use abrasive cleaners or solvents. Ensure the device is powered off and disconnected from any probes before cleaning.
4.2 Battery Replacement
When the low battery indicator appears on the display, replace the three AA batteries promptly to ensure continuous operation and accurate readings.
4.3 Probe Care
Handle thermocouple probes with care. Avoid bending or kinking the cable excessively. Clean probes after each use, especially if exposed to corrosive substances, to prolong their lifespan and maintain accuracy.
5. Specifications
| Feature | Specification |
|---|---|
| Brand | Fluke |
| Model Name | 51 II |
| Special Feature | High Accuracy |
| Color | Black, Yellow |
| Included Components | Type K bead thermocouple probe with a 40-inch cable |
| Specification Met | NIST |
| Display Type | Digital |
| Connectivity Technology | Wired (Thermocouple) |
| Product Care Instructions | Wipe Clean |
| Power Source | Hand Powered |
| Number of Batteries | 3 AA batteries required (included) |
| Upper Temperature Range | 1372 ℃ |
| Response Time | 500 milliseconds |
| Reusability | Reusable |
| Indoor Outdoor Usage | Indoor |
| Item Length | 5 inches |
| Item Weight | 300 g |
6. Warranty & Support
6.1 Warranty Information
For detailed warranty information regarding your Fluke 51 II Digital Thermometer, please contact the vendor or refer to the official Fluke website. Warranty terms may vary based on region and purchase location.
6.2 Customer Support
Should you encounter any issues or require technical assistance with your Fluke 51 II, please visit the official Fluke support website or contact their customer service department. Ensure you have your model number and purchase details available when seeking support.
You can visit the Fluke Store on Amazon for more product information and resources.