80TK Thermocouple Module Instruction Sheet Introduction Basic Accuracy: ( 23 5C Calibration)* The Fluke 80TK is a thermocouple converter for use with any (Applies for one year after purchase or recalibration) K-type thermocouple and a digital multimeter. The 80TK accepts the output of any K-type thermocouple and converts it RANGE ACCURACY (% of reading + to 1 millivolt per degree (Celsius or Fahrenheit). degrees), 1 year A three-position switch acts as a power switch as well as -20 to 350C 0.5% 2C selecting Fahrenheit or Celsius scaling for the output. In -4 to 662F 0.5% 3.6F addition, the OFF position of the power switch allows you to 351 to 500C 1.75% 2C read the battery condition via the external multimeter. The 664 to 932F* 1.75% 3.6F thermocouple input accepts wire leads or standard mini- 501 to 1000C 2.0% 2C thermocouple connectors. 933 to 1832F 2.0% 3.6F Temperature is measured by exposing or attaching the -50 to -21C 2.5% 2C typical thermocouple to the surface to be measured. The multimeter -58 to -5.8F 2.5% 3.6F typical displays the temperature directly in degrees Fahrenheit or Celsius. Temperature Coefficient: * 0C to 18C and 28C to 50C ambient, multiply the basic Specifications accuracy specification by 0.1 for each degree above 28 or below 18. Electrical For accuracy enhancement between 351C to 500C, subtract 3 degrees from the reading. The accuracy is now Measurement Range: -50 to 1000 degrees Celsius 0.75% 2C. -58 to 1832 degrees Fahrenheit * For accuracy enhancement between 663F and 932F, Resolution: subtract 5.4 degrees from the reading. The accuracy is now 0.75% 3.6F. 2000 count display: 0.1 C/F in 200 mV range Note 1.0 C/F in 2V range The basic accuracy specification does not include the 3200 count display: 0.1 C/F in 300 mV range error of the probe or the DMM. Please refer to the 1.0 C/F in 3V range probe accuracy specification for additional details. 4000 count display: 0.1 C/F in 400mV range 1.0 C/F in 4V range General Note: Ignore decimal point on 2V, 3V, or 4V range. Weight: 4.5 ounces, 126 grams Maximum Voltage at Thermocouple Input: 60V DC, 24V AC Overall length: 4 5/8 inches, 11.75 mm RF Field: Exposure to an RF field interferes significantly with this modules capacity to accurately measure temperature with Battery: Standard 9V Battery (NEDA 1604, 6F22, 006P) thermocouples. The interference is temporary and the module Battery Life: 1600+ hours, 6.5V minimum suffers no harm when exposed to an RF field of 3 V/m. Output: 3/4 inch spaced banana plugs, 10 megohm minimum Accurate temperature measurement capability is completely load resistance restored when the module is removed from the RF field. Common sources of RF fields are handheld 2-way radios and cellular telephones. If such a source is suspected of interfering Accessories with this module, either turn off the transmitter or increase the separation between the transmitter and the module. 80PK-1 (included): Bead Probe 4 foot K-type thermocouple bead probe, with Teflon tape insulation. Maximum insulation temperature: 260C. Accuracy: 2.2C or 0.75% (whichever Environmental is greater) from 0 to 800C. 80PK-2A: Immersion Probe (8 or 20.32 cm from tip to probe Ambient Operating Range: 0 to 50C handle) Storage Temperature: -40 to 60C 80PK-3A: Surface Probe (for flat or curved surfaces) -40 to 140F Humidity: 0% to 90% (0 to 35C) 80PK-4A: Air Probe (protected by stainless steel baffle) 0% to 70% (35 to 50C) 80PK-5A: Piercing Probe (suitable for food use, liquids and gels) 80PK-6A: Exposed Junction Probe (exposed bead attached to 6 sheath) PN 735985 February 1985 Rev.6, 11/02 1985-2002 Fluke Corporation. All rights reserved. Printed in USA All product names are trademarks of their respective companies.5. Turn on the 80TK and the multimeter. 80PK-7: Industrial Surface Probe 6. Adjust the thermal connection between the measurement 80PK-8 Pipe Clamp Probe (For pipe diameter 1/4 to 1 7/8) surface and the thermocouple as described previously. 80CK-M: Male Mini-Connector (for attachment of K-type 7. Read the temperature on the multimeter. thermocouple wire) Open Thermocouple Reading Use and Operation If the thermocouple probe has open circuited (i.e. is broken), Thermocouples rely upon the difference in temperature the mulimeter will read a steady, constant voltage. The voltage between the measuring junction and a reference junction. readings are: Traditionally the reference junction is another thermocouple placed in an ice bath, however, the 80TK uses an electronic reference junction. The converter (80TK) must be operated in Range Reading a thermal environment consistent with its specifications. C 1.0V F 2.2V Measuring Technique Battery Condition Test Making accurate temperature readings using a thermocouple is a matter of identifying and minimizing the causes of error. 1. Set the power switch to the OFF position. The largest contributor to errors is the thermal interface between the measurement surface and the thermocouple. The 2. Connect the 80TK to the multimeter. next largest contributor is the temperature difference between 3. Set the multimeter to the 200, 300, or 400 mV dc range. the thermocouple probe and its environment. 4. Read the battery test voltage on the multimeter. A Here are some suggestions for improving the accuracy of your minimum reading of 75 mV is acceptable and indicates temperature measurements. Ensure that there is a good that approximately 100 hours of battery life remain. connection between the probe and the surface you are measuring. You can do this in many ways: Battery Replacement 1. Increase the mounting pressure. 2. Use an interface agent (such as silicone grease) between Warning the thermocouple probe and the surface you are measuring. To avoid electrical shock, remove the thermocouple from the measurement surface, or 3. Use a thermal epoxy to attach the thermocouple. disconnect the thermocouple from the When measuring temperatures higher than ambient, adjust the instrument before opening the case. Totally connection of the probe to the surface until you get the highest reassemble the instrument before attempting to temperature reading. Use any of the suggestions given above use it. to do so. 1. Set the power switch to the OFF position. When measuring temperatures lower than ambient, adjust the 2. Disconnect the 80TK from the multimeter. connection of the probe to the surface until you get the lowest temperature reading. Use any of the suggestions given above 3. Unplug or disconnect the thermocouple. to do so. 4. Turn the 80TK so the power switch is facing down. When measuring temperatures near ambient, make the Remove the single screw located between the banana reading when the multimeter display is most stable. plugs. 5. Grasp one case half in each hand. Pull the two halves Warning apart, beginning at the end with the banana plugs. To avoid electrical shock, do not use this instrument 6. Remove and replace the battery. when voltages exceeding 24V ac or 60V dc are present. The probe tip is electrically connected to the output 7. Reassemble the 80TK. terminals. 8. To reassemble, mate the two case halves at the end with the thermocouple connector, thenhing the two halves together. Temperature Measurement Follow this procedure to correctly use the 80TK. 80TK Self Test 1. Plug the 80TK into the multimeter. Ensure that the banana plug with the red dot above it plugs into the voltage input The following test is an easy way to verify proper operation of and the other plug is in the COM input. the 80TK: 2. Set the multimeter to the 200, 300, or 400 millivolt range. 1. Follow the Battery Replacement Procedure to open the This setting will read temperatures equal to the number of case. millivolts the range has (i.e., 320C or F if the millivolt 2. Using a short piece of bare wire, short the input range reads 320 mV. thermocouple terminals together. 3. Use the dc volt setting and ignore the decimal for higher 3. Plug the 80TK into the multimeter. temperatures than can be accomodated by the millivolt 4. Turn the multimeter and the 80TK on. Set the multimeter range. Less resolution is available when using the volt to 200, 300, or 400 mV range. range. 5. The multimeter should read the ambient room 4. Plug the thermocouple into the 80TK thermocouple input temperature. connector. If the thermocouple does not have a plug attached, connect the thermocouple wires to the thermocouple input screws inside the 80TK. The yellow coded wire (chromel) connects to the screw marked +. .