Omega Engineering 873C Operator'S Manual Download Page 1 | Manualshive

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Summary of Contents for 873C

Page 1: ...r OMEGA H FiyniiyFFDii iG iiur EIMGIIMEERIIMCIIMC I n 0 lf f t l i r w u p C o m p a n y MODEL 873 Hand Held Digital Thermometer Operator s Manual ...

Page 2: ...PECIAL DAMAGES THE BUYER S SOLE REMEDY FOR ANY BREACH OF THIS AGREEMENT BY OMEGA ENGINEERING INC OR ANY BREACH OF ANY WARRANTY BY OMEGA ENGINEERING INC SHALL NOT EXCEED THE PURCHASE PRICE PAID BY THE PURCHASER TO OMEGA ENGINEERING INC FOR THE UNIT OR UNITS OR EOUIPMENT DIRECTLY AFFECTED BY SUCH BREACH Return Requests Inquiries Direct all warranty and repair requests inquiries to OMEGA Customer Ser...

Page 3: ...l Conditions 4 OPERATION 5 Safety Precautions 6 SERVICING INFORMATION 9 Functionality Check 9 Performance Verification 9 Environmental Conditions 10 Disassembly Instructions 10 Battery Installation Replacement 12 Calibration 13 Probe Matching 15 Troubleshooting 15 Special Handling of Static Sensitive Devices 18 Component Layout 21 Schematic Diagram 23 ...

Page 4: ...0 C range measures temperature from 55 C to 1000 C with a resolution of 1 C The ac curacy is 0 25 rdg i 1 0 C from 40 C to 1000 C and 0 25 of rdg l 2 C for 40 C to 55 C The Model 873F measures temperature from 60 F to 200 F on two ranges The 200 F range measures temperature from 60 0 F to 199 9 F with a resolution of 0 1 F The 2000 F range measures temperature from 60 F to 1999 F with a resolution...

Page 5: ...uple Connec tor Male Subminiature Thermocouple Connec tor Female 1 oz jar of High Thermal Conductivity Paste for fast surface measurements PREPARATION FOR USE The Models 873F and 873C are supplied ready for use with battery installed Connect the appropriate probe to the miniature TC connec tor located on the top of the instrument just above the display SAFETY SYMBOLS AND TERMS The symbol on the in...

Page 6: ...cting the desired range Model 873C A 200 C range is the center position of the ON OFF range switch B 1000 C range is the upper position of the ON OFF range switch Model 873F A 200 F range is the center position of the ON OFF range switch B 2000 F range is the upper position of the ON OFF range switch 2 Select the appropriate temperature probe and insert it into the input jack 3 Make the measuremen...

Page 7: ...the probe tip when measuring excessively high or low temperature 2 Do not exceed 42V peak from the probe tip or input jack to earth ground Miniature TC Connector Low Battery Indicator Minus Sign Displayed Plus Sign Implied 3V4 Digit Display On Off Range Switch OMEGA 873C THERMOMETER LO BAT loao 200 TYPE K THEHMOCOUPLE NiCr N AI RANOE I B C to lOOO C 42V MAX Figure 1 Model 873C Control Layout 4 ...

Page 8: ...ttery Indicator Minus Sign Displayed Plus Sign Implied VA Digit Display On Off Range Switch OMEGA 873F THEHMOMETER r DM I QO U TYPE K THEIIMOCOUPI E N i C r N i A l RANOE tO E to 2000 F A 42V MAX Figure 2 Model 873F Control Layout ...

Page 9: ...y FUNCTIONALITY CHECK At room temperature hold the tip of a probe sensor between your thumb and index finger A reading between 25 C and 40 C 77 F and 104 F should be observed to confirm functionality of the instrument PERFORMANCE VERIFICATION Accuracy Check 1 Prepare a distilled water ice bath or use an OMEGA TRC III Ice Point Reference Chamber 2 Connect a TC probe to the input jack of the instrum...

Page 10: ...er 2 Separate the bottom cover from the rest of the instrument by grasping the top of the case just above the display and carefully lifting it away from the display 3 Remove the battery 4 Remove the standoff ST 166 1 that secures the PC board to the case The standoff is located in the center of the PC board 5 Remove the switch cap 6 Lift the PC board out of the top cover front panel 7 Remove the s...

Page 11: ...instrument be sure to reinstall the switch cover Common mode voltage may be present on the switch creating a possible hazard if the cover Is not installed f U a K 7 V RLUSTtn a HEQUIRED BOTTOM COVER Figure 3 Model 873 Exploded View ...

Page 12: ...nt off and disconnect the input probe before removing the bottom cover Reinstall the cover before resuming usa of the instrument 2 Remove the old battery 3 Place the new battery in the battery compartment Be sure to observe the proper polarity Refer to Figure 4 4 Reinstall the bottom cover before resuming use of the instrument BArrenv TERMINALS Rgure 4 Battery Installation ...

Page 13: ...a waterproof jacket 2 Connect the thermocouple wires from the type K transition junc tion to an OMEGA Miniature Thermocouple Connector SMP K M 3 Turn on the voltage calibrator 4 Plug in the miniature connector see steps 1 and 2 into the 873 input 5 Connect the copper wires to the 100 1 divider as shown in Figure 5 Connect the copper chromel wire to the positive sida 6 Connect the 100 1 divider to ...

Page 14: ...e at a uniform temperature during calibration Figure 5 Set Up Procedure Calibration Procedure 1 Remove the bottom cover as described in the disassembly instruc tions WARNING To prevent a shock hazard turn the instrument off and remove the Input probe from the instrument before removing the bottom cover 2 Turn on the Model 873 and perform the calibration adjustments listed in Table 2 873C or Table ...

Page 15: ...90 0 F 60 0 F PROBE MATCHING To improve the accuracy of the Model 873 while using a particular proJTe calibration can be adjusted so that probe errors in the region of zero 0 0 C or 32 F are compensated Place the probe in an ice bath and allow the reading to stabilize Then reset the zero adjustment R112 to a 0 0 C or 32 F reading TROUBLESHOOTING The following troubleshooting information is intende...

Page 16: ... 0 206V 0 204V 0 204V 0 201V 0 200V 0 197V 0 195V 0 193V Pin 12 Pin 11 Pin 10 Pin 9 Pin 8 Pin 7 Pin 6 Pin 5 Pin 4 Pin 3 Pin 2 873F 1 23 V 0 209V 0 208V 0 205V 0 204V 0 203V 0 198V 0 197V 0 196V 0 191V 0 188V The setting of Rl 15 and the tolerances of the resistors within the net work R114 can affect these levels by 5 6 Cold Junction Voltage Ambient Temperature 25 C 3 C Across R102A approximately e...

Page 17: ...U104 PIN 40 OSC 1 U104 PIN 39 OSC 2 H 25 isec K U104 PIN 38 K 25 sec 5V U104 PIN 21 M 20msec BV Figure 6 Waveform Checks 14 ...

Page 18: ...ic Sensitive Devices Schematic Designation U104 U105 U107 U108 U109 1 Devices should be handled and transported in protective con tainers antistatic tubes or conductive foam 2 Use a properiy grounded work bench and a grounding wriststrap 3 Handle devices by the body only 4 Printed circuit boards must be grounded to bench while inserting devices 5 Use antistatic solder removers 6 Use grounded tip s...

Page 19: ...5 of rdg 0 2 F F INPUT CURRENT 25nA typical 50nA maximum MODEL 8730 SPECIFICATIONS TEMPERATURE SENSOR Type K Ni NiAl Thermocouple TEMPERATURE ACCURACY RANGE SPAN RESOLUTION 18 to 28 C 2 yeara 200 C 40 0 to 199 9 0 1 0 25 rdg t 1 0 C 55 0 to 40 0 0 1 0 25 rdg t 2 0 C 1000 C 40 to 1000 1 0 25 rdg I 1 C 55 to 40 If 0 25 rdg 2 C Includes NBS conformity cold junction compensation temperature coefficien...

Page 20: ...3 R H C from 35 to 50 C ENVIRONMENTAL LIMITS FOR STORAGE Model 873F 30 to 140 F less than 90 relative humidity up to 95 F linearly derate 1 5 R H F from 95 to 140 F ENVIRONMENTAL LIMITS FOR STORAGE Model 873C 35 to 60 C less than 90 relative humidity up to 35 C linearly derate 3 R H C from 35 to 60 C THERMOCOUPLE LINEARIZATION Multislope A D with 11 piecewise linear segments THERMOCOUPLE INPUT Min...

Page 21: ...lectrolytic Capacitor 33MF 63V Metalized Polyester Silicon Diode 1N914 Miniature TC Connector Female Battery Clip Battery Clip Transistor NPN 2N3904 Transistor NPN 2N3904 Transistor PNP 2N3906 Resistor 10k 5 1 4W Composition Thick Film Resistor Networic Thick Rim Resistor Network Resistor 10M 5 1 4W Composition Potentiometer Ik Potentiometer 50012 Potentiometer 2k Thick Film Resistor Network Resis...

Page 22: ...tch 4P3T On Off Range Switch Op Amp LM308 Factory selected part of A31419 Current Source LM334 Factory selected part of A31410 Low Power JFET Op Amp TL062Cp 3 1 2 Digit A D Converter ICL7136 Quad 2 Input NOR Gate 4001 Dual Synchronous Up Counter 4518 12 Stage Binary Counter 4020 Analog Multiplexer 4051 Analog Multiplexer 4053 Reference Diode 1 23V Jumper Wire Sch Location Sev Sev F4 G4 86 Dl Sev C...

Page 23: ... T SCHEMATIC DIAGRAM f r a a il ir i 8 i tiM I 11 H 1 5 i 5 I ...

Page 24: ...RII3 2fe7K _ OR RII3 I 2 I K o JIOOI CIO ED ZDCI02 JIOOI SIDE 2 SIOI C109 5 H y C106 Q iftiilj RIQ Rmz O 00 O WIOl RIGS RII5 U I 0 6 n 1 n n JIOO2 JI003 o o TJ o z m 5 O c ...

Page 25: ...ut ...

Page 26: ... book you will want to keep within reach at all times Send for your LATEST COPY now One Omega Drive Box 4047 Stamford CT 06907 0047 203 359 1660 Telex 996404 FAX 203 359 7700 Phone 203 359 1660 HMDilOOKAiio BIEYiaOFEIllA O M E G A l A A H ENGiiUEERiNG IIMC An OIWEGA Group Company ...

Page 27: ...ss Monitors D Data Acquisition Modules and Data Loggers D Computer Sensor Interface D Technical and Reference Books Return Requests Inquiries Direct all warranty and repair requests inquiries to OMEGA Customer Service Department telephone number 203 359 1660 Before returning any instrument please contact the OMEGA Customer Service Department to obtain an authorized return AR number The designated ...

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