FLUKE 80PK-1 Instruction 电路图.pdf

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 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 260C (500F), Teflon will emit toxic fumes. SPECIFICATIONS Type: K Special Grade (Chromel vs Alumel) Measurment Range: -40C to 260C (-40F to 500F) continuous Accuracy (with respect to NBS tables for Special Grade): 1.1C (2.0F) over the range of 0C to 260C (32F to 500F) Typically within 1.1C (2.0F) of NBS Tables over the range of -40C to 0C (-40F to 32F) RadioFans.CN 收音机爱 好者资料库 Output: 25C (77F) = 1.00mV (reference junction at 0C) Seebeck Coefficient: 25C (77F) = 40.50 V / 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: 260C (500F Cable: Length: 40 inches (1 meter) Insulation: Material: Teflon Maximum Temperature: 260C (500F) 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: 200C (392F) 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 RadioFans.CN 收音机爱 好者资料库 junction compensation. Accuracy of the temperature measuring instrument must be considered along with the 80PK-1 accuracy specification in order to determine the overall accuracy of the combination. Temperature Limitations The 260C 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. RadioFans.CN 收音机爱 好者资料库 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 attach 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 following: 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 instruments owners 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.