® 51 & 52 Series II Thermometer Users Manual English September 1999 Rev.2, 11/10 © 1999-2010 Fluke Corporation, All rights reserved. All product names are trademarks of their respective companies.
Limited Warranty & Limitation of Liability This Fluke product will be free from defects in material and workmanship for 3 years from the date of purchase. This warranty does not cover fuses, disposable batteries or damage from accident, neglect, misuse or abnormal conditions of operation or handling. Resellers are not authorized to extend any other warranty on Fluke’s behalf.
Table of Contents Title Introduction .................................................................................................................... Contacting Fluke........................................................................................................ Getting Started ............................................................................................................... Components .................................................................................................
51 & 52 Series II Users Manual Maintenance .................................................................................................................. Replacing the Batteries ............................................................................................. Cleaning the Case and Holster ................................................................................. Calibration.................................................................................................................
1 & 52 Series II Introduction Contacting Fluke The Fluke Model 51 and Model 52 Thermometers (“the thermometer”) are microprocessor-based, digital thermometers designed to use external J-, K-, T-, and Etype thermocouples (temperature probes) as temperature sensors. To order accessories, receive assistance, or locate the nearest Fluke distributor or Service Center, call: Use the thermometer only as specified in this manual. Otherwise, the protection provided by the meter may be impaired.
51 & 52 Series II Users Manual Table 1. Safety Information W Warning A Warning identifies conditions and actions that pose hazards to the user. To avoid electrical shock or personal injury, follow these guidelines: • Before using the thermometer inspect the case. Do not use the thermometer if it appears damaged. Look for cracks or missing plastic. Pay particular attention to the insulation around the connectors. • Disconnect the thermocouple(s) from the thermometer before opening the case.
51 & 52 Series II Introduction Table 1. Safety Information (cont.) W Warning (cont.) • Model 52: Measurement errors may occur if voltages on the measurement surfaces result in potentials greater than 1 V between the two thermocouples. When potential differences are anticipated between the thermocouples, use electrically insulated thermocouples. • When servicing the thermometer, use only specified replacement parts. • Do not use the thermometer with any part of the case or cover removed.
51 & 52 Series II Users Manual Table 2. International Symbols W Refer to the manual for information about this feature. M Battery. P Complies with European Union directives. ) Complies with relevant Canadian Standards Association directives. Getting Started • Figure 1 and Table 3 describe the components. Everything in this Users Manual applies both to Models 51 and 52 unless otherwise indicated. • Figure 2 and Table 4 describe the display. • Table 5 describes the functions of the buttons.
51 & 52 Series II Getting Started Components Table 3. Components xx 3 2 5 1 4 Thermocouple T1 input Model 52: Thermocouple T2 input Holster Display Buttons Battery door Batteries 6 7 aas01f.eps Figure 1.
51 & 52 Series II Users Manual Table 4. Display Elements Display Elements xx 2 3 4 1 The thermocouple measurement includes an offset. See "Changing Setup Options." The displayed readings do not change. A shift function is in progress. Setup is in progress. Low battery. Replace the batteries. Primary Display. Model 51: T1 reading. Model 52: T1, T2, or T1-T2 reading. The temperature unit. Secondary Display: MAX, MIN, AVG, or offset. 5 6 7 10 8 9 aas02f.eps Figure 2.
51 & 52 Series II Getting Started Buttons Table 5. Buttons Press to turn the thermometer on or off. Press , (CANCEL) to stop displaying the minimum, maximum, and average readings in the secondary display. (Shift function) Press to turn the backlight on and off. The backlight turns off after 2 minutes without any button presses. If the battery is low, the backlight is disabled. Press to step through the maximum, minimum, and average readings.
51 & 52 Series II Users Manual Table 5. Buttons (cont.) Press to start or exit Setup. (See "Changing Setup Options.") Press to scroll to the Setup option you want to change. Press to increase the displayed setting. Press to scroll to the Setup option you want to change. Press to decrease the displayed setting. Press to enter a Setup option. Press again to store the displayed setting in memory.
51 & 52 Series II Using the Thermometer Using the Thermometer 1. Plug the thermocouple(s) into the input connector(s). 2. Press to turn on the thermometer. After 1 second the thermometer displays the first reading. If no thermocouple is plugged into the selected input or the thermocouple is "open," the display shows "- - - -" Changing Setup Options Use Setup to change the thermocouple type, offset, sleep mode, and line frequency settings. The thermometer stores the settings in its memory.
51 & 52 Series II Users Manual Changing a Setup Option 1. Press or to scroll to the setup option you want to change. 2. Press to indicate that you want to change this setting. 3. Press or until the setting you want to use appears on the display. 4. Press to store the new setting in memory. Notes Setup is disabled in MIN MAX mode. Offset: The primary display shows the temperature plus the offset and the secondary display shows the offset. Remember to reset the offset to 0.
51 & 52 Series II Measuring Temperatures Measuring Temperatures Notes The display shows "- - - -" when a thermocouple is not connected. Connecting a Thermocouple To change the thermocouple type, see “Changing Setup Options.” The North American ANSI Color Code is: Type J K E T N Color Black Yellow Purple Blue Orange 1. Plug a thermocouple into the input connector(s). (Make sure that the polarity is correct.) 2. Set the thermometer for the correct thermocouple type.
51 & 52 Series II Users Manual Holding the Displayed Readings 1. Press to freeze the readings on the display. The display shows . 2. 3. Model 52: Press to toggle showing the T1, T2, or T1-T2 readings in the primary or secondary display. Press again to turn off the HOLD function. Viewing the MIN, MAX, and AVG Readings 1. 2. 12 Using the Offset to Adjust for Probe Errors Use the offset option in Setup to adjust the thermometer's readings to compensate for the errors of a specific thermocouple.
51 & 52 Series II Maintenance Maintenance Calibration Replacing the Batteries To ensure that the thermometer performs to its accuracy specifications, Fluke recommends that you calibrate the thermometer annually, starting one year after purchase. Refer to the safety information in Table 1 before replacing the batteries. 1. Turn off the thermometer if necessary. 2. Loosen the screw and remove the battery door. 3. Replace the three AA batteries. 4. Replace the battery door and tighten the screw.
51 & 52 Series II Users Manual General Weight 280 g (10 oz) Dimensions (without holster) 2.8 cm × 7.8 cm × 16.2 cm (1.1 in × 3 in × 6.4 in) Battery 3 AA batteries Certification P, ) Safety CAN/CSA C22.2 No.
51 & 52 Series II Replacement Parts and Accessories Electrical (cont.) Measurement Accuracy, T1, T2, or T1-T2 (Model 52) Temperature Coefficient J-, K-, T-, and E-type: ±[0.05 % of o o reading + 0.3 C (0.5 F)] o o [below -100 C (-148 F): add 0.15 % of reading for J-, K-, E-, and N-type; and 0.45 % of reading for T-type] o o [below -100 C (-148 F): add 0.04 % of reading for J-, K-, E-, and N-type; and 0.
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