Fluke 50D User's Manual
Contents
1. shock disconnect the thermocouple s before opening the case Caution e Do not attempt to recharge the battery e To prevent explosion do not dispose of the battery in fire e Follow local laws or regulations when disposing of batteries To replace the battery refer to Figure 2 and the assembly procedures located previously in this document zf02f eps Figure 2 Replacing the Battery 50D is shown 50S amp 50D Thermometer Calibration Information Required Test Equipment Table 2 lists the required test equipment needed to perform the performance test and calibration procedures for the 50S and 50D thermometers If the required equipment is not available instruments with equivalent specifications may be used Table 2 Required Test Equipment Test Equipment Required Characteristics Recommended Model Fluke 87 Series IV Digital DMM DC Voltage Accuracy 0 5 Multimeter Temperature Probe Accuracy Certified to 0 2 C ambient Fluke Model 80T 150U Output Voltage 0 to 10 V Accuracy 0 025 DC Voltage Calibrator Resolution 10 uV Fluke 5520A Elastomeric Switch Pad Fluke Part Number 680686 Fluke 80CK M Thermocouple Connector For K type thermocouple Fluke Part Number 779942 80CJ M Thermocouple Connector For J type thermocouple Fluke Part Number 833046 Thermocouple Wire K or J Type Standard Omega Dewar Flask Cap 1 pint capacity Thermos Mercury Thermometer eithe2. thermometer is now in the Reference Junction Sensor calibration mode Shorting out the VIEW switch grid turns off a filter so that the reading stabilizes immediately 13 Using the 80T 150U and the Fluke 87 Series IV Digital Multimeter DMM measure the reference junction transistor temperature by placing the 80T 150U probe tip against Q1 located in the middle hole of the isothermal block Wait for the temperature reading to stabilize 14 Adjust R16 for a temperature reading that is the same as displayed on the DMM 15 Turn the thermometer OFF by shorting the ON OFF switch grid and reattach the top case 50S or 50D Thermometer zf07f eps Figure 5 Calibration Connections Calibration FLUKE 52 1601 zf09f eps Figure 6 A1 Main PCA Adjustments Optimizing Thermometer Performance in the Negative Temperature Range Perform the following steps to optimize the thermometer performance in the negative temperature range 1 Put the thermometer in normal operating mode Normal operation can be achieved by turning the thermometer OFF and then ON No other thermometer buttons should be pressed during the power cycle operation Insert a known good thermocouple in an ice bath see Ice Bath Construction earlier in this document Insert the Mercury Thermometer to the same depth as the thermocouple wires verifying the ice bath temperature is 0 0 C 0 1 C Connect the other end of the
3. 50S amp 50D Thermometer Calibration Information ZA Warning These service instructions are for use by qualified personnel only To avoid electric shock do not perform any servicing unless you are qualified to do so Introduction This document contains specifications general maintenance information performance tests calibration procedures and a list of user replaceable parts for the Fluke 50S and 50D Thermometers hereafter referred to as the thermometer Service To contact Fluke order parts or locate a Fluke service center call one of the following telephone numbers USA 1 888 99 FLUKE 1 888 993 5853 Canada 1 800 36 FLUKE 1 800 363 5853 Europe 31 402 675 200 Japan 81 3 3434 0181 Singapore 65 738 5655 Anywhere in the world 1 425 446 5500 Or visit Fluke s Web site at www fluke com Warranty This Fluke product will be free from defects in material and workmanship for one year 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 To obtain service during the warranty period send your defective tester to the nearest Fluke Authorized Service Center with a description of the problem THIS WARRANTY IS YOUR ONLY REMEDY NO OTHER WARRANTIES SUCH AS FITNESS FOR A PARTICULAR PURPOSE ARE EXPRESSED OR IMP
4. LIED FLUKE IS NOT LIABLE FOR ANY SPECIAL INDIRECT INCIDENTAL OR CONSEQUENTIAL DAMAGES OR LOSSES ARISING FROM ANY CAUSE OR THEORY Since some states or countries do not allow the exclusion or limitation of an implied warranty or of incidental or consequential damages this limitation of liability may not apply to you Fluke Corporation Fluke Europe B V P O Box 9090 P O Box 1186 Everett WA 5602 B D 98206 9090 Eindhoven The Netherlands PN 1281009 October 1999 Rev 1 3 03 1999 2003 Fluke Corporation All rights reserved Printed in U S A All product names are trademarks of their respective companies 1 50S amp 50D Thermometer Calibration Information International Symbols Table 1 identifies the international electrical symbols used in this document Table 1 International Electrical Symbols Used in this Document Low Battery A Important information GR Complies with relevant Canadian C Complies with European Union directives c US Standards Association directives A Underwriters Laboratories Inc Precautions and Safety Information Use the thermometer only in the ways specified in the 50S amp 50D Users Manual part number 1278540 In this manual a Warning statement identifies conditions and actions that pose a hazard to the user a Caution statement identifies conditions and actions that may damage the thermometer or the test instruments Safety Information AWarning To avoid electrical sh
5. NEDA 1604 6F22 or 006P Protection Class Ill as defined in IEC 348 Safety Requirements for Electronic Apparatus Environmental Operating Temperature 0 C to 50 C 32 F to 122 F Storage Temperature 40 C to 60 C 40 F to 140 F Humidity 0 to 90 0 C to 35 C 32 F to 95 F 0 to 70 0 C to 50 C 32 F to 122 F Electrical Measurement Range Display Resolution Measurement Accuracy K type 200 C to 1370 C 328 F to 2498 F J type 200 C to 760 C 328 F to 1400 F Low 1 0 C or 1 0 F High 0 1 C or 0 2 F K type 0 1 of reading 0 7 C 0 1 of reading 1 3 F J type 0 1 of reading 0 8 C 0 1 of reading 1 4 F Temperature Coefficient 0 01 of reading 0 03 C 0 03 F for ambient temperatures from 18 C to 28 C 64 F to 82 F Maximum Differential Common Mode Voltage Temperature Scale Certification Applicable Standards 1 V Maximum voltage difference between T1 and T2 IPTS 68 CE NBS 125 IEC 584 Accuracy is specified for ambient temperatures between 18 C 64 F and 28 C 82 F for a period of 1 year The above specifications do not include thermocouple error Accuracy is unspecified when the input lead length is resonant with the interfering frequency Basic Maintenance Basic maintenance required by the thermo
6. URE MULTIPLEXED 50D 1 50S Not shown 2 773135 THERMO COUPLE ASSY T C ASSY K TYPE BEADED MOLDED PLUG 50D Not shown 1 1278540 MULTI LANGUAGE FLUKE 50S amp 50D USERS MANUAL All Not shown 1 890298 HOLSTER amp FLEXSTAND ASSY YELLOW All 50S amp 50D Thermometer Calibration Information zf08f eps Figure 8 Exploded View Diagram Model 50D is Shown 14
7. e first construct an ice bath using the following steps 1 Prepare a Dewar Flask by drilling two holes in its cap to accept the thermometer and thermocouple wires or use a standard laboratory cork 2 Fill the Dewar Flask with shaved or crushed ice made from distilled water 3 Fill the Dewar Flask with enough distilled water so that the ice turns to slush but do not add enough water to float the ice Note As the ice melts siphon off the excess water and add more ice Allow approximately 5 to 10 minutes for the water to drop back to the freezing point 4 Replace the Dewar Flask cap or cork and insert the thermocouple wires as shown in Figure 4 50S amp 50D Thermometer Calibration Information 50S or 50D Thermocouple wire Thermometer Ice bath Copper wire zf05f eps Figure 4 Ice Bath Equipment Connections Ice Bath Test Use the following procedure to test the thermometer This test should be conducted on both thermocouple inputs of the 50D 1 Connect the equipment as shown in Figure 4 2 Insert the Mercury Thermometer to the same depth as the thermocouple wires and verify that the ice bath temperature is 0 0 C 0 1 C Short or apply 0 mV to the copper wires at the 5520A Calibrator 4 Verify the thermometer reads 0 0 C 0 4 C If this test fails reposition the thermocouple wires and Mercury Thermometer in the ice bath and repeat steps 2 4 If the test continu
8. es to fail perform the calibration procedure located later in this document 6 Remove the short applied in step 3 7 Using Table 3 for the corresponding thermocouple type obtain an output from the 5520A equal to the first value of the Input Voltage mV DC column and verify that the thermometer reads within the limits specified 8 Repeat these steps for the remaining voltages in the Input Voltage mV DC column 9 Disconnect the thermocouple from the input terminals This completes the ice bath test Calibration Table 3 Performance Test Values Thermocouple Input Voltage Display Reading Type mV DC C F K 5 587 182 0 0 9 295 6 1 6 K 3 211 89 0 0 8 128 2 1 4 K 21 919 530 0 1 2 986 0 2 3 K 54 297 1355 0 2 1 2471 0 3 8 J 7 824 197 0 1 0 322 6 1 7 J 13 997 258 0 1 1 496 4 1 9 J 39 442 705 0 1 5 1301 0 2 7 Calibration When calibrating the thermometer refer to Figure 5 for the proper setup connections and Figure 6 for adjustment locations Caution When directed to short a switch grid in the following procedures use only the elastomeric switch pad that is supplied as pca damage may occur if a hard tool is used Thermometer Calibration 1 2 Nw Pp p Turn the thermometer off and remove the top case leaving the Main PCA in the bottom case Simultaneously short the TP1 switch grid and turn on the ther
9. meter is discussed in this section Cleaning the Thermometer Caution e To avoid damaging the thermometer do not use aromatic hydrocarbons or chlorinated solvents for cleaning These solutions react with the plastics used in the thermometer e Do not allow the LCD to get wet e Do not remove any of the lubricant from the input terminals 50S amp 50D Thermometer Calibration Information Clean the thermometer case with a mild detergent and water The pca may be washed with isopropyl alcohol or deionozed water and a soft brush Dry the pca with clean dry air at low pressure then bake it at 50 C for 24 hours Disassembly Reassembly Thermometer disassembly is necessary to replace the battery and some interior parts see Replaceable Parts later in this document Refer to Figure 1 when disassembling and reassembling the thermometer To disassemble the thermometer 1 Turn the thermometer OFF if necessary 2 Loosen the four bottom case screws and remove the top case To reasemble the thermometer 1 Replace the top case 2 Tighten the four bottom case screws zf01f eps Figure 1 Thermometer Disassembly and Reassembly 50D is shown Basic Maintenance Changing the Battery A Warning e Replace the battery as soon as the low battery indicator 5 appears The possibility of false readings increases when the battery is not fully charged False readings can lead to personal injury e To avoid electrical
10. mometer by shorting the ON OFF switch grid Hold the elastomeric switch pad on TP1 for at least 3 seconds after the thermometer turns on This puts the thermometer into the Thermocouple Calibration mode Allow the thermometer to stabilize at room temperature 23 C 5 C 73 F 9 F Select C mode Select T1 if the thermometer is a Fluke 50D Adjust the 5520A for 0 00000V Connect the 5520A output to the TP1 input Allow the thermometer reading to stabilize Refer to Figure 6 and adjust the T1 offset adjustment R7 for a display reading of 25 2 C 0 1 C If you are calibrating a Fluke 50S skip the next two steps he 10 11 12 Leave the 5520A adjusted for 0 00000 V Connect the 5520A output to the T2 input and select the T2 function Allow the reading to settle and adjust the T2 offset adjustment R13 for a display reading of 25 2 C 0 1 C Adjust the 5520A for 53 807 mV output Allow the reading to stabilize and adjust R21 for a display reading of 1370 0 C 0 4 C Disconnect the thermometer from the 5520A Turn the thermometer off by shorting the ON OFF switch grid With an elastomeric switch pad in both hands use the left pad to short out the TP2 grid and use the right pad to first turn on the instrument and then quickly short out the VIEW switch grid Hold this 50S amp 50D Thermometer Calibration Information position until the display is locked in self test all LCD segments on This
11. ock or personal injury follow these guidelines e 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 Replace the battery as soon as the low battery indicator E4 appears The possibility of false readings can lead to personal injury Do not use the thermometer if it operates abnormally Protection may be impaired When in doubt have the thermometer serviced Do not operate the thermometer around explosive gas vapor or dust Do not apply more than the rated voltage as marked on the thermometer between the thermocouple s or between any thermocouple and earth ground When servicing the thermometer use only specified replacement parts Do not use the thermometer with any part of the case or cover removed Caution To avoid damaging the thermometer or the equipment under test Use the proper thermocouples function and range for your thermometer Do not attempt to recharge the battery To prevent explosion do not dispose of battery in fire Follow local laws or regulations when disposing of battery Specifications Specifications General Weight 280 g 10 oz Dimensions 2 8 cm x 7 5 cm x 16 6 cm without holster 1 1 in x 3 in x 6 6 in Battery Standard 9 V battery
12. r C or F 0 02 C resolution 0 05 F resolution Princo Model ASTM56C Princo Model ASTM56F Performance Tests Performance tests are recommended for incoming inspection periodic maintenance and for verifying the thermometer s specifications If the thermometer fails any part of the performance tests calibration and or repair is indicated Use the following procedure to prepare the thermometer before beginning the performance tests or calibration procedures 1 Allow the thermometer to stabilize to room temperature 23 C 5 C 73 F 9 F 2 Check the battery and replace it if necessary Display Test Turn the thermometer on while pressing the HOLD button All display segments are shown until the HOLD button is released Check that all the display segments are showing as in Figure 3 Note Because pressing the HOLD button during power up activates one of the thermometers other functions take care to return the instrument to its normal function if necessary Performance Tests 50S Display 50D Display aD Ot tm EON A Bl 10 Ld HOLD Of G zf03f eps Figure 3 Display Segments Wide Range Performance Test Procedure This test verifies the instrument specifications If the instrument fails this test perform the calibration procedure If the unit continutes to fail it should be taken to a Fluke service center Ice Bath Construction To begin the wide range performance test procedur
13. ter 0 02 C resolution Lag bath room temperature water Immersed to approximately same depth zf06f eps Figure 7 Room Temperature Lag Bath 12 Replaceable Parts Replaceable Parts Refer to Table 4 for all replacement part numbers and Figure 8 for part locations Unless specified in the Model Number column all parts are for all units To order replaceable parts see the Service Centers section of this manual Table 4 50S and 50D Replaceable Parts Fluke Item Part Model Number Qty Number Description Number 1 778191 MAIN PCA 50S 1 1 778209 MAIN PCA 50D 2 1 696534 BATTERY PRIMARY 9V 0 15MA All 3 4 832246 SCREW PH P AM THD FORM STL 5 14 750 All 4 1 519116 SCREW PH P THD FORM STL 4 24 250 All 5 4 448456 SCREW PH P AM THD FORM STL 4 14 375 All 1280490 CASE TOP 50S 6 1 1280483 CASE TOP 50D 1280766 CASE BOTTOM 50S 7 1 1280753 CASE BOTTOM 50D 8 1 646653 BRACKET LCD All 9 1 1280151 MASK BRACKET FLUKE 50S 50S 1280160 MASK BRACKET FLUKE 50D 50D 10 1 745794 ISOTHERMAL BLOCK All 11 2 649632 CONNECTOR ELASTOMERIC LCD TO PWB 1 900 L All 12 1 761924 BOTTOM SHIELD MYLAR All 13 4 640565 FOOT NON SKID All 14 1 844340 LABEL WINDOW All 15 1 791343 WINDOW LCD BLANK All 16 1 742205 LCD FLUKE 51 LCD 5 DIGIT TEMPERATURE MULTIPLEXED 50S 741314 LCD FLUKE 52 LCD 5 DIGIT TEMPERAT
14. thermocouple wire to the T1 input of the thermometer and allow the instrument reading to stabilize Slowly and in small increments adjust R7 T1 offset until the thermometer reading matches the Mercury Thermometer reading Allow the thermometer reading to stabilize and repeat the adjustment as necessary until a stable and correct reading can be attained Repeat steps 4 and 5 for R13 T2 offset Fluke 50D only Thermocouple Input Calibration Optional Note This adjustment procedure counteracts the adjustments made in the Optimizing Performance in the Negative Temperature Range section of this document This procedure optimizes the 50S or 50D for measurement with a specific thermocouple Perform the thermocouple input calibration using the following procedure 1 2 3 4 Construct an ambient temperature lag bath as shown in Figure 7 Connect the thermocouple to the thermometer input terminals Select the applicable switch postion T1 or T2 and temperature scale C or F Insert the probe into a room temperature lag bath 50S amp 50D Thermometer Calibration Information 5 Allow the system to stabilize then adjust T1 or T2 offset adjustments for a temperature display equal to the reading of the lag bath reference thermometer 6 Calibration of the thermometers is complete Disconnect all test equipment from the instrument 50S or 50D Thermometer Thermocouple wire P m Mercury thermome
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