SCIENTIFIC INSTRUMENTS 21-52-42 B7270_Component service manual
Contents
1. engraved on the body of the unit This manual is divided into separate sections Title Page Testing and Fault Isolation Record of Revisions Disassembly Record of Temporary Revisions Cleaning Service Bulletin Information List Check List of Effective Pages Repair Table of Contents Assembly including Storage Introduction Fits and Clearances Description and Operation Special Tools Fixtures and Equipment Specifications illustrated Parts List Refer to the Table of Contents for the page location of applicable sections The quantities in this manual are expressed S I units followed by English units in parenthesis This manual will be revised as necessary to reflect current information Page INTRO 1 INTRO 2 21 52 42 Dec 09 2003 LN STRAT qg COMPONENT MAINTENANCE MANUAL B7270 DESCRIPTION AND OPERATION 1 DESCRIPTION The Model B7270 Temperature Sensor consists of two calibrated negative temperature coefficient NTC thermistors which are located within the tip of an aluminum probe assembly The probe assembly is externally threaded for boss mounting on an aircraft duct as illustrated in Figure 1 2 OPERATION The resistance of the NTC thermistors varies in direct proportion to changes in the duct air temperature The thermistors are terminated at pins C amp D and E amp F of a 6 pin hermetically sealed stainless steel receptacle which is fastened to the probe body This receptacle provides the interfac2. or cracks 21 52 42 PAGES Dec 09 2003 LN g COMPONENT MAINTENANCE MANUAL B7270 8 REPAIR The temperature sensor is considered non repairable Bent receptacle pins may be carefully straightened For other defects or incorrect operation the temperature sensor should be discarded 9 ASSEMBLY INCLUDING STORAGE A Assembly Not Applicable B Storage 1 Install a protective cap on the electrical connector 2 The sensor must be stored in a clean and dry room open to the air The temperature must be between 18 C and 28 C 64 F and 82 F and the relative humidity between 25 and 65 3 Keep the sensor in its initial packaging If other containers are put on the sensor container be careful to prevent damage caused by too much weight 4 Do not keep the sensor near heat fluids or other sources that can cause corrosion 10 FITS AND CLEARANCES No dimensional check of the sensor is necessary 11 SPECIAL TOOLS FIXTURES AND EQUIPMENT No other special tools are necessary 12 ILLUSTRATED PARTS LIST Since the unit is non repairable no parts list is provided 21 52 42 _ PAGES 09 2003
3. ANK Check DEC 09 2003 Repair BLANK Assembly including DEC 09 2003 storage BLANK Fits and clearances DEC 09 2003 BLANK Special tools fixtures and equipment DEC 09 2003 illustrated parts list DEC 09 2003 21 52 42 Page LEP 1 LEP 2 Dec 09 2003 DATE DEC 09 2003 DEC 09 2003 DEC 09 2003 DEC 09 2003 DEC 09 2003 DEC 09 2003 DEC 09 2003 DEC 09 2003 DEC 09 2003 vim cm mn MANUAL B7270 TABLE OF CONTENTS DESCRIPTION AND OPERATION e Ty RO e or e Ren harenae 1 SPECIFICATIONS ii soni ri o u ea es tacit thee 1 TESTING AND FAULT ISOLATION er Run be e e a kr me noce eviter pes 2 DISASSEMBLY Lo doma Pre anie erat bea tra EMO A 5 CLEANING E 5 CHECK n 5 lt actin 6 ASSEMBLY INCLUDING STORAGE is L eo cece sx xa ras 6 FITS ANDCEEARANGCES uuu 6 SPECIAL TOOLS FIXTURES AND EQUIPMENT 6 HLUSIRATEDPARTSEISHLLu N ap atau denote od Gs tis td vind traded E EO a fosa 6 E Page TC 1 TC 2 21 52 42 Dec 09 2003 sim omm COMPONENT MAINTENANCE MANUAL B7270 INTRODUCTION This manual describes the general configuration of the Temperature Sensor Model B7270 manufactured by Scientific Instruments Inc Identification data including part number serial number and FAA PMA data is
4. Insulation Resistance 1 2 Check the continuity between pin A and the case Using the megohmeter measure the resistance between receptacle pins B C D E and F shorted together and the housing The reading should exceed 400 megohms 50 VDC E Electrical Test refer to Figure 2 1 2 3 4 Connect the Ohmmeter to pins C amp D of the temperature sensor Hold the sensor at a temperature of 5 C 3 C 41 F 5 4 F within the environmental test chamber With the thermometer at a stable temperature and located within approximately 12 7 mm 1 2 in of the tip of the sensor measure the temperature Compare this value to that indicated on Figure 3 The value must be within the limits shown on the drawing Connect the Ohmmeter to pins E amp F of the temperature sensor Hold the sensor at a temperature of 5 C 3 C 41 F 5 4 F within the environmental test chamber With the thermometer at a stable temperature and located within approximately 12 7 mm 1 2 in of the tip of the sensor measure the temperature Compare this value to that indicated on Figure 3 The value must be within the limits shown on the drawing Connect the Ohmmeter to pins C amp D of the temperature sensor Hold the sensor at a temperature of 50 C 3 C 122 F 5 4 F within the environmental test chamber With the thermometer at a stable temperature and located within approximately 12 7 mm 1 2 in of the tip of the sensor meas
5. LN vum om COMPONENT MAINTENANCE MANUAL TEMPERATURE SENSOR Part Number B7270 Issued by SCIENTIFIC INSTRUMENTS INC 4400 W Tiffany Drive West Paim Beach FL 33407 USA Tel 561 881 8500 Fax 561 881 8556 Page T 1 T 2 Oct 12 1999 21 52 42 Rev 2 Dec 09 2003 LN SITUE COMPONENT MAINTENANCE MANUAL B7270 RECORD OF REVISIONS REVISION REVISION INSERTION REVISION REVISION INSERTION DATE DATE DATE DATE 1 03 09 00 2 12 09 03 RR 1 RR 2 21 52 42 Dec 09 2003 a COMPONENT MAINTENANCE MANUAL B7270 RECORD OF TEMPORARY REVISIONS TEMPORARY INSERTED DELETED REVISIONS DATE REVISION No FO _ R9 Page TR 1 TR 2 21 52 42 Dec 09 2003 SIUE STRAT w COMPONENT MAINTENANCE MANUAL B7270 SERVICE BULLETIN LIST SERVICE DATE SUBJECT BULLETIN INSERTED SBL 1 SBL 2 21 52 42 Dec 09 2003 Title Page Record of revisions Record of temporary revisions Service Bulletin List List of effective pages Table of Contents Introduction Description and operation Specifications m COMPONENT MAINTENANCE MANUAL PAGE 7270 LIST OF EFFECTIVE PAGES DATE DEC 09 2003 BLANK Testing and fault isolation DEC 09 2003 BLANK DEC 09 2003 Disassembly BLANK Cleaning DEC 09 2003 BL
6. e between the thermistors and an associated temperature controller The controller processes the thermistors signal to monitor and regulate the aircraft temperature control system 3 SPECIFICATIONS Receptacle FDBA 50H 10 6PNK or equivalent Mating Connector MS3476L106S or equivalent Weight 0 070 kg 2 469 oz maximum Size Probe Diameter 11 99 mm 0 472 in maximum Overall Length 178 18 mm 7 015 in maximum Mounting Thread M14 x 1 0 6g This du is listed for test purposes only and is not necessarily used on the aircraft 21 52 42 PAGE Dec 09 2003 vm MANUAL B7270 ATTACH TO CONNECTOR Scientific Instruments Inc Hn SHELL FOR GROUND SN NC OOOO Outline and Schematic Drawing Figure 1 TESTING AND FAULT ISOLATION 4 TESTING AND FAULT ISOLATION A The data that follows permits the testing of the sensor to insure correct operation B Special Tools and Test Equipment 1 Amegohmeter capable of reading 400 megohms and greater at 50 VDC AEMC Model 1000 or equivalent 2 Temperature controlled environmental test chamber Accuracy 1 3 Thermometer with temperature accuracy 0 2 F 0 11 C 4 Ohmmeter with Current 0 1 mA Accuracy 0 0596 Range 0 100 21 52 42 PAGE 2 Dec 09 2003 w COMPONENT MAINTENANCE MANUAL B7270 C Visual Check 1 Visually check the sensor for obvious damage D
7. ure the temperature Compare this value to that indicated on Figure 4 The value must be within the limits shown on the drawing Connect the Ohmmeter to pins E amp F of the temperature sensor Hold the sensor at a temperature of 50 C 3 C 122 F 5 4 F within the environmental test chamber With the thermometer at a stable temperature and located within approximately 12 7 mm 1 2 in of the tip 21 52 42 PAGE 3 Dec 09 2003 5 ren MANUAL 7270 of the sensor measure the temperature Compare this value to that indicated on Figure 4 The value must be within the limits shown on the drawing ATTACH TO CONNECTOR SHELL FOR GROUND Schematic for Electrical Test Figure 2 Resistance Ohms Temperature Degrees C Resistance vs Temperature Figure 3 21 52 42 PAGE 4 Dec 09 2003 LN COMPONENT MAINTENANCE MANUAL B7270 E s 2 0 o a Temperature Degrees C Resistance vs Temperature Figure 4 5 DISASSEMBLY Not Applicable 6 CLEANING A Remove dirt stains moisture etc with a clean dry lint free cloth B Use a soft bristle brush moistened in isopropyl alcohol to remove any foreign matter from between the receptacle pins 7 CHECK A Visually inspect the sensor probe for obvious wear or damage B Check for bent broken or missing receptacle pins C Check probe housing for scratches
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SCIENTIFIC INSTRUMENTS 21 52 42 B7270_Component service manual