Fluke 80PK-1 User Manual

Page 1
Instruction Sheet
80PK-1
WARNING
TO AVOID ELECTRICAL SHOCK, DO NOT USE THIS PROBE WHEN VOLTAGES EXCEEDING 24V AC RMS OR 60V DC ARE PRESENT. THE PROBE TIP IS ELECTRICALLY CONNECTED TO THE OUTPUT TERMINALS.
INTRODUCTION
The 80PK-1 is a Type K Bead Thermocouple designed for general purpose temperature measuring applications. It has an extremely fast response time, due to the low thermal mass of the exposed tip. The 40-inch (1-meter) Teflon cable is terminated with a Type K miniature thermocouple connector with 0.312-inch (0.792-mm) pin spacing. The 80PK-1 can be used with any temperature measuring instrument that is designed to accept Type K thermocouples and that has a miniature connector input.
The 80PK-1 must be used in Teflon-compatible environments and is not suitable for liquid immersion. Above 260°C (500°F), Teflon will emit toxic fumes.
SPECIFICATIONS
Type: K Special Grade (Chromel vs Alumel) Measurment Range: -40°C to 260°C (-40°F to 500°F)
continuous
Accuracy (with respect to NBS tables for Special Grade): ±1.1°C (2.0°F) over the range of 0°C to 260°C (32°F to 500°F) Typically within 1.1°C (2.0°F) of NBS Tables over the range of -40°C to 0°C (-40°F to 32°F)
March, 1985 Rev.3, 4/02
©1989-2002 Fluke Corporation. All Rights Reserved. Printed in U.S.A. All product names are trademarks of their respective companies
Page 2
Output: 25°C (77°F) = 1.00mV (reference junction at 0°C) Seebeck Coefficient: 25°C (77°F) = 40.50 µV / °C Measurement Time (Time Constant): 2 seconds (for air at room
temperature and one atmosphere of pressure moving with a velocity of 65 ft / sec) Maximum Voltage: 24V ac rms or 60V dc maximum for proper safe operation.
Maximum Temperature of Bead: 260°C (500°F Cable:
Length: 40 inches (1 meter) Insulation:
Material: Teflon Maximum Temperature: 260°C (500°F)
Conductors:
Type K Size: AWG #24 solid Length: 48 inches nominal
Polarity and Color Coding:
Chromel: + yellow Alumel: - red Outer Jacket: black
Connector:
Type: yellow mini-thermocouple connector with 0.312-inch pin spacing
Material: Hytrel Maximum Temperature: 200°C (392°F)
Protection:
Class 3. Relates solely to insulation and grounding properties defined in IEC 348.
MEASUREMENT CONSIDERATIONS
Instrument Compatibility
The 80PK-1 is designed to be compatible with any temperature measuring instrument that accepts Type K thermocouples, has a miniature thermocouple connector, and has cold reference
Page 3
junction compensation. Accuracy of the temperature m easuri ng instrument must be considered along with the 80PK-1 accuracy specification in order to determine the overall accuracy of the combination.
Temperature Limitations
The 260°C continuos temperature rating of the 80PK-1 is primarily determined by the Teflon insulation. The bead alone may be momentarily subjected to higher temperatures without damage.
Media Limitations
Type K Chromel-Alumel thermocouple wires are compatible with clean oxidizing atmospheres.
OPERATION
Caution
Repeated sharp bending can break the 80PK-1 lead. To protect the lead, avoid sharp bends, especially near the connector.
Use the 80PK-1 as follows:
1. Connect the 80PK-1 to a compatible Type K temperature measuring instrument using the miniature (0.312-inch pin spacing) thermocouple connector.
2. Turn on the measuring instrument and select the appropriate range and scale.
3. Check the readout on the measuring instrument. With no heat or cold source applied to the bead, it should display the ambient (room) temperature. If the instrument does not readout properly, refer to the TROUBLESHOOTING section below.
MEASURING TECHNIQUE
Here are some suggestions for improving the accuracy of your temperature measurements:
1. Make sure that there is a good connection between the probe and the surface you are measuring by doing any of the following: a. Increase the mounting pressure.
Page 4
b. Use an interface agent (such as silicone grease)
between the thermocouple probe and the surface you are measuring.
c. Use a thermal epoxy to att ach the thermocouple.
2. When measuring higher than ambient temperatures, adjust the connection between the probe and the surface until you obtain the highest temperature reading. To ensure a good connection, see the suggestions above.
3. When measuring lower than ambient temperatures, adjust the connection between the probe and the surface until you get the lowest temperature reading. To ensure a good connection, see the suggestions above.
4. When measuring near ambient temperatures, make the reading when the multimeter readout is most stable.
TROUBLESHOOTING
With no heat or cold applied to the bead, the measuring instrument should display the ambient temperature. If the measuring instrument does not readout properly, try the followi ng:
1. Verify that the temperature measuring instrument is designed to be used with Type K thermocouples. It should have a yellow input connector and / or be
marked with a “K”.
2. Check for an open circuit indicator on the measuring instrument. Some temperature measuring instruments have a built-in circuit to indicate if the connected probe is open. (All Fluke instruments have this feature.) Refer to the measuring instrument’s owner’s manual to see if this feature is available.
If you suspect a broken connection, use an ordinary ohmmeter to check its continuity from pin to pin. The ohmmeter should read 10 or less if there is continuity.
3. Short the two input pins of the measuring instrument with a piece of wire. If the instrument is functioning, it should indicate the ambient temperature.
Loading...