14120

Name

Identifier

Engineering Standard NumberSENSOR,TEMPERATURE

PERFORMANCE SPECIFICATION(ITEM)

14120

EngineeringStandards

rs used

Abstract

This document describes the performance requirements for Thermistor Temperature Sensoto measure various gas and liquid temperatures on and about engines.

Current Release Number Std. Revision Level of 26006992020-022

CUMMINS CONFIDENTIALThis document (and the information shown thereon) isCONFIDENTIAL AND PROPRIETARY and shall not be disclosed to others in hard copyor electronic form, reproduced by any means, or used for any purpose without written consent of Cummins Engine Company, Inc.

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Identifier



14120


Table of Contents

Heading Page Number

Abstract ..............................................................................................................................1Table of Contents ...............................................................................................................21. Scope ..............................................................................................................................32. Applicable Documents ...................................................................................................33. Definitions ......................................................................................................................34. Specifications .................................................................................................................3

4.1. General...................................................................................................................34.2. Mechanical.............................................................................................................44.3. Electrical ................................................................................................................64.4. Environmental........................................................................................................8

5. Operating Life Requirements .......................................................................................115.1. Life Expectancy Goal .......................................................................................115.2. Reliability Goal.................................................................................................115.3. Shelf Life ..........................................................................................................11

Appendix A: Figures and Tables............................................................................................12Table A1: Vibration Profile Power Spectral Density (PSD) ......................................12Figure A1: Coordinate System For The Sensor..........................................................13Figure A2: Test Fixture...............................................................................................14Figure A3: Signal Conditioning Circuit......................................................................17Figure A4: Typical Step Responses For A Sensor And Signal Conditioning ............18Figure A5: Combined Environment Test Profile........................................................19Figure A6: Vibration Amplitude PSD ........................................................................20Figure A7: Air Leakage Test Setup ............................................................................21Figure A8: Temperature Sensor Test Rig ...................................................................22Table A2: Fuel Pump Vibration Profile Power Spectral Density (PSD)....................23Figure A9: Fuel Pump Vibration Profile ....................................................................24

Appendix B: Self Heat Current Test Procedure................................................................25Figure B1: Circuit Schematic For Self-Heating Test..................................................26



Name

Identifier



14120


rs used

ted in

eneralneral

ment

pany, the

1. Scope

This document describes the performance requirements for Thermistor Temperature Sensoto measure various gas and liquid temperatures on and about engines.

2. Applicable Documents

Applicable documents listed below may be obtained from the respective organizations lisCES 10054, Standard Organization Addresses.

a. CES 10054, Standard Organizations Addressesb. CES 10056, General Glossaryc. CES 10651, Temperature Sensors, Administrative Specificationsd. CES 14113, Environmental, Electricale. CES 20000, #2 Diesel Fuelf. CES 20021, Used Engine Oilg. CES 20059, Transmission Oilh. CES 20065, Engine Coolanti. CES 21055, Paintj. CES 26000, Multi-Purpose Cleanerk. MIL STD 45662 A, Calibration Systems Requirements

3. Definitions

There are no unique definitions in this standard. Terms used in this standard that have a gdefinition for usage in Cummins Engineering Standards are defined in CES 10056, GeGlossary.

4. Specifications

4.1. General

4.1.1. All measurements required by this standard shall be performed using equipmaintained and calibrated in accordance with the requirements of MIL STD 45662 A.

4.1.2. The sensors shall meet all requirements of the applicable Cummins Engine Comdrawings. If the requirements of a drawing conflict with the requirements of this standardrequirements of the drawing shall apply.



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Identifier



14120


cified

0651.

e finalns peronflict

staticectors anded Zstatics. A

4.1.3. When not directly enumerated in this standard, numerical values of the speparameters will be found on the applicable Cummins Engine Company drawings.

4.1.4. The axes used to describe the sensor coordinate system are illustrated inFigure A1:Coordinate System For The Sensor on page 13.

4.1.5. Room Conditions

Ambient environmental conditions shall be:

a. Temperature: 25 plus or minus 10 degrees Celsiusb. Relative Humidity: 90 percent or lessc. Barometric Pressure: 26 to 32 inches Hg

4.1.6. Source Approval

The source approval procedures for thermistor temperature sensors are specified in CES 1

4.2. Mechanical

4.2.1. Physical Package

The physical construction and appearance of the sensor assembly shall conform to thdimensions and tolerances, materials, identification, instructions, and pertinent specificatioapplicable Cummins drawings, procedures, and practices. If the requirements of a drawing cwith the requirements of this standard, the requirements of the drawing shall apply.

4.2.2. Connector/Lead Wire Integrity

Each connector, when mated to its corresponding connector, shall withstand a minimumforce of 111 newtons (25 pounds) without loosening, permanently distorting either the connor the terminal, or affecting the operation of the device. The force shall be applied in the pluminus X directions (along the axis of the connector, SeeFigure A1: Coordinate System For ThSensor on page 13), and applied to the end of the connector in the plus and minus Y andirections (perpendicular to the axis of the connector). The integrity test shall consist of theforce applied successively, for a period of 1 minute each, in each of the specified directionforce gauge shall be used to monitor the actual force.



Name

Identifier



14120


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4.2.3. Connector Durability

The integral connector (on the component) and the cable mounted connector shall withtwenty-five (25) cycles of mating and un-mating at room temperature. Following this test tshall be no evidence of damage to the contacts, the contact plating, the integral and cable mconnector housings, or seals which may prove detrimental to the performance of the senso

4.2.4. Design Torque

The sensors with M14 or 9/16 inch thread shall withstand a minimum design torque ofNewton-meters (30 foot-pounds) without mechanical degradation to the electrical performSensors with M12 mounting thread shall withstand a minimum design torque of 24 Newton-m(18 foot-pounds) without mechanical degradation to the electrical performance.

4.2.5. Pressure Seal

4.2.5.1. Coolant and Oil Temperature Sensors

The sensors under test shall be mounted with the specified torque in a manifold, perFigure A2:Test Fixture on page 14or equivalent. The manifold/sensor system shall be pressurizedcompressed air to the maximum operating pressure of the sensors. Each sensor shall be coaa soap solution. Visual inspection of the coated sensor over a period of five minutes shall shsigns of leakage.

4.2.5.2. Air Temperature Sensors

This test shall be done at installation torques of 10 and 20 foot-pounds plus or minus 2 foot-pof torque. The sensor under test shall be mounted in a manifold, perFigure A2: Test Fixture onpage 14or equivalent. The manifold/sensor system shall be pressurized with compressedroom temperature to 20 psi. For new (zero hour) sensors, no air leakage over 5 cc/min. sobserved. The test setup is shown inFigure A7: Air Leakage Test Setup on page 21.

4.2.6. Paint

The sensor shall meet all the requirements of this standard after being subjected to one electengine painting process. An alkyd water reducible engine enamel is applied with a potentialto 80 kilovolts. The paint thickness shall be 0.002 to 0.007 inches thick. All external markingthe sensor shall be legible after the painting process. The mating connector or a protectiveshall be in place to prevent the electrical terminals from being painted.



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Identifier



14120


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sensors.

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4.2.7. Over Pressure Requirements

4.2.7.1. Proof Pressure

The sensor shall meet the requirements of this standard and the applicable drawing aftersubjected to a pressure of 2 times the working pressure, 100 psi for coolant and oil sensorspsi for air sensors, for 1 minute.

4.2.7.2. Burst Pressure

4.2.7.2.1. Air Temperature Sensors

The sensor shall stay intact when the sensor is subjected to three times the maximum wpressure of 60 psi for a minimum of 5 minutes.

4.2.7.2.2. Coolant and Oil Temperature Sensors

The sensor shall stay intact and must not allow the pressure medium to spray about when theis subjected to 3 times the maximum working pressure of 100 psi for a minimum of 5 minute

4.3. Electrical

4.3.1. Calibration

The resistance vs. temperature curve of the sensors shall fall within the limits specified oapplicable drawing. The units under test shall be positioned with the sensing element expoan agitated, constant-temperature, liquid bath at each of the specified temperatures. Theshall be positioned in the bath so the top of the liquid is on the mounting threads of the sensosensors shall be allowed to equalize in the bath for a minimum of ten (10) thermal time consas specified on the applicable drawing, before the resistance is measured. The temperatureand agitation of the liquid bath shall insure that the measured temperature throughout thearea of the bath is accurate and uniform to plus or minus 0.1 degrees Celsius. Any appromedium (water, glycol, etc.) may be used for this test.



Name

Identifier



14120


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4.3.2. Thermal Time Constant

4.3.2.1. Coolant, Oil, and Other Sealed Element Temperature Sensors

The sensors shall be connected to the conditioning circuit ofFigure A3: Signal ConditioningCircuit on page 17. The sensors shall be tested by allowing the sensors to stabilize at rtemperature, then plunging the sensing elements into an agitated, constant temperature, liquat 100 degrees Celsius while monitoring the output of the conditioning circuit on a strip cstorage oscilloscope, or similar device. The time for the output to reach 63 percent of thevalue shall be determined and must be within the thermal time constant limits specified oapplicable drawing. An example time response is shown inFigure A4: Typical Step ResponseFor A Sensor And Signal Conditioning on page 18. The sensors shall be positioned in the baththe top of the liquid is on the mounting threads of the sensor. The liquid should be 100 peglycol, ethylene or propylene. The temperature of the bath should be controlled to plus or m1.0 degrees Celsius (as measured over the testing area of the bath), and the agitation ssufficient to insure that any additional agitation would produce a negligible decrease inresponse time of the sensor during this test. Other liquids and temperatures may be uagreement with the Cummins Chief Product Engineer.

4.3.2.2. Air Temperature Sensors

Test Procedure: Allow the test equipment to reach steady state conditions. The wind tvelocities for the high and low temperature conditions shall be 5 meters per second. The prregulator valves can be adjusted to perform this task. The wind tunnel temperatures shambient temperature for the low temperature wind tunnel and 32 to 38 degrees Celsius aboambient wind tunnel temperature for the high temperature tunnel. The high temperaturetemperature can be adjusted by changing the setting on the circulation heater.

Stabilize the temperature sensor under test at the ambient tunnel temperature. Once steadyreached, transition the sensor/manifold assembly to the high temperature wind tunnel. Recofrom the point where the sensor/manifold assembly is switched to where the correspondingvoltage for 63.2 percent change in final output is achieved. The time difference will be the thetime constant. Typical step responses are shown inFigure A4: Typical Step Responses ForSensor And Signal Conditioning on page 18.



Name

Identifier



14120


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4.3.3. Self Heating Current

Using the procedures in Appendix B, the resistance change due to the specified Self HCurrent shall not exceed the value specified on the applicable drawing.

4.3.4. Isolation Resistance

The isolation resistance, measured at 500 Volts Direct Current, from any lead to the case sgreater than 100 Megohm at room conditions when measured with a hi pot tester.

4.4. Environmental

The sensors shall meet all of the requirements of this specification, without failure,completion of the Environmental requirements.

4.4.1. General Test Conditions for Temperature Sensors

4.4.1.1. For all of the environmental testing the electrical connector of the sensor shmated with the specified mating connector.

4.4.1.2. Unless otherwise specified, the sensors will be connected to the conditioning cshown in Figure A3: Signal Conditioning Circuit on page 17.

4.4.1.3. Unless otherwise specified, the sensors will be mounted in the test fixture shoFigure A2: Test Fixture on page 14.

4.4.2. Chemical Resistance

The sensors shall meet the Chemical Spray Test requirements of CES 14113 using diesel fuengine oil, engine degreaser, transmission fluid, multi-purpose cleaner, and antifreeze. Thunder test will be installed in a test manifold and powered through a harness with a mconnector during this test.

4.4.3. Salt Fog

The sensors shall meet the Salt Atmosphere requirements of CES 14113. The units sinstalled in a test manifold and powered through a harness with a mating connector during th

4.4.4. Sand and Dust

The sensors shall meet the Dust requirements of CES 14113. The units shall be installed inmanifold and powered through a harness with a mating connector during this test.



Name

Identifier



14120


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4.4.5. Low Pressure Wash

The sensors shall meet the Low Pressure Wash requirements of CES 14113. The units sinstalled in a test manifold and powered through a harness with a mating connector during th

4.4.6. Water Intrusion Test

The sensors shall be installed in a test manifold and powered through a harness with aconnector during this test. This test shall be conducted by preconditioning the sensors by sat the highest specified operational temperature for 1 hour. Upon completion of the pre-immerse the sensors and manifold in cold (10 to 30 degrees Celsius) tap water for 30 miRemove the sensors and dry with compressed air for 2 minutes. After completion of the tesensors shall be within limits for all operational parameters.

4.4.7. Engine Test and Line Wash

Subject the sensor to an actual engine line process including all wash tests while locatedengine in its actual mounting location. Upon completion of the test the sensor(s) shall be remfrom the engine and allowed to set for one week in the normal sensor installation orientationenergized.

4.4.8. High Pressure Wash

The sensors shall meet the High Pressure Wash requirements of CES 14113. The units sinstalled in a test manifold and powered through a harness with a mating connector during th

4.4.9. Steam

The sensors shall survive a steam cleaning test while powered through a harness with aconnector. The units under test shall be mounted in an airtight chamber with an equal numunits in each of three mutually perpendicular mounting orientations. The sensors shall be pofrom outside the chamber. The units shall be sprayed with high pressure, high temperature(1,000 to 1,200 pounds per square inch; 99 to 110 degrees Celsius) alternately away frodirectly onto the sensors for 10 minutes. The sensors shall be sprayed for a minimum of 1 mand a maximum of 2 minutes followed by a similar period with the spray away from the senAt the end of the 10-minute spray period, the sensors will remain in the steam-filled chamban additional 10-minute period. At the end of that period, the chamber shall be opened asensors allowed to cool for a minimum of 1 hour. After completion of the test, the sensors shwithin the limits for all operational parameters.



Name

Identifier



14120


After

of the

After

96 hour

to 60to 150minus

adbandxis of

at

4.4.10. Thermal Requirements

4.4.10.1. Shock

The sensors shall meet the Air to Air Thermal Shock requirements of CES 14113.completion of the test, the sensors shall be within the limits for all operational parameters.

4.4.10.2. Temperature Soak

The sensors shall meet the Temperature Soak requirements of CES 14113. After completiontest, the sensors shall be within the limits for all operational parameters.

4.4.10.3. Temperature Cycling Durability

The sensors shall meet the Temperature Cycling Durability requirements of CES 14113.completion of the test, the sensors shall be within the limits for all operational parameters.

4.4.11. Drop

The sensors shall meet the Drop Test requirements of CES 14113.

4.4.12. Humidity

The sensors shall meet the Humidity requirements of CES 14113.

4.4.13. Temperature/Vibration

The sensors shall meet the requirements of this standard and the applicable drawing after atemperature and vibration perFigure A5: Combined Environment Test Profile on page 19. Each4-hour cycle shall consists of a dwell for 1 hour at minus 40 degrees Celsius, a transitiondegrees Celsius in 15 minutes, a dwell at 60 degrees Celsius for 45 minutes, a transitiondegrees Celsius, in 15 minutes, a dwell for 1 hour at 150 degrees Celsius, and a transition to40 degrees Celsius in 45 minutes.

During the combined temperature and vibration test, the sensors shall be subjected to a brorandom vibration test profile on each of the 2 perpendicular axis (termed axial along the X athe sensor, and radial, in the Y-Z plane) according to the cycle shown inFigure A5: CombinedEnvironment Test Profile on page 19. Each 4-hour cycle shall consist of a dwell for 45 minutesthe start and finish with no applied vibration.



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14120


points

ts

llythe X,ed toll betest.

he life

0,000

eters

4.4.13. Temperature/Vibration (Continued)

The vibration frequency range is 20 to 2000 Hertz. The power spectral density (PSD) breakare given inTable A1: Vibration Profile Power Spectral Density (PSD) on page 12, and illustratedin Figure A6: Vibration Amplitude PSD on page 20. The power spectral density (PSD) breakpoinfor an alternate vibration profile for fuel pump applications are given inTable A2: Fuel PumpVibration Profile Power Spectral Density (PSD) on page 23and illustrated inFigure A9: FuelPump Vibration Profile on page 24. The vibration specification is the same for all three mutuaperpendicular directions. The sensors shall be mounted to vibrate for 8 cycles (32 hours) inremounted to vibrate in the Y direction for 8 cycles (32 hours) of vibration and again remountvibrate in the Z direction for 8 cycles (32 hours). A visual examination of the sensors wiperformed just prior to each set of 8 cycles and immediately following the completion of the

5. Operating Life Requirements

The sensors shall meet all of the requirements of this standard without maintenance during tof the device.

5.1. Life Expectancy Goal

The B50 life of the sensor shall be a minimum of 30600 hours of engine operation or 1,37kilometers (805,000 miles).

5.2. Reliability Goal

The warrantable failure rate shall not exceed 0.2 per hundred devices at 161,000 kilom(100,000 miles).

5.3. Shelf Life

The shelf life shall not be less than 10 years while subjected to the following conditions:

a. Temperature shall be minus 55 to plus 150 degrees Celsiusb. Humidity equal to 100 percentc. Atmospheric pressure (725 plus 50/minus 75 mm Hg)d. No applied voltage



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Appendix A: Figures and Tables

Table A1: Vibration Profile Power Spectral Density (PSD)

Frequency HZ PSD ((RMS G)2/Hz)

20.0 0.0108

106.5 0.259

182.5 0.0325

600.0 0.0325

1490.0 0.195

2000.0 0.0162

RMS G level = 12.5



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Appendix A: Figures and Tables (Continued)

Figure A1: Coordinate System For The Sensor



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Figure A2: Test Fixture

11.00

5.00

1.7504x

1.6524x

2.00 4.00 4.00 .5003x 2x 2x

3x

2.00

2.00

.500

4x

2x

4x

2x 2.00 2x 2.00 2x 2.00 2x 2.44

AA

8x .380 Thru

8 x Dia. 8/16-18 UNF-2A Straight Thread O-RingDia. 0.4375 (Deep symbol) 1.250 Min.

.0625 -A-



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Figure A2: Test Fixture (Continued)

3.00

Section A-A

2X 7/16-20UNF-2BStraight Thread O-RingPort per SAE Std. J514Table 11See Detail A

-B-

-A-

4.00 4.00 .460

3x 2.00

2x .500

5x .380 thru

1.250

2x2x

.250 8.875 Min.

.0625 -A-



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Figure A2: Test Fixture (Continued)



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Figure A3: Signal Conditioning Circuit

sensor

+5 V

Vout2k ohm



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Identifier



14120



Figure A4: Typical Step Responses For A Sensor And Signal Conditioning



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Figure A5: Combined Environment Test Profile

260

60

-40

ON

OFF2.5 .

1.0 .25 0.75 .25 1.0 .754.0

Tem

pera

ture

Deg

rees

CV

ibra

tion

Duration (hours)



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Figure A6: Vibration Amplitude PSD

Frequency (Hz)

1

0.1

0.0110 100 1,000

ampl

itude

((R

MS

G)^

2/hz

)



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Figure A7: Air Leakage Test Setup

Temperature Sensor Being Tested

Test Fixture

Flowmeter0-180 CC/min

Air Source



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Figure A8: Temperature Sensor Test Rig



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Table A2: Fuel Pump Vibration Profile Power Spectral Density (PSD)

Frequency (Hz) Baseline PSD (G2/Hz)Accelerated 20 hour/axis test

PSD (G2/Hz)

20 0.001476 0.00447

116 0.1036 0.3137

183 0.05851 0.1771

226 0.5171 1.566

401 .01239 0.3751

491 0.3250 0.9841

882 0.08982 0.2719

1293 1.0566 3.199

2000 0.04894 0.1482

Grms = 23.068 40.128



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Figure A9: Fuel Pump Vibration Profile

Am

plitu

deG

2 /Hz



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14120


ded.

, thecantnd a

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Appendix B: Self Heat Current Test Procedure

B.1. The following procedure for performing the Self Heat Current Test is recommenAlternate test procedures are acceptable upon written approval of Cummins.

B.2. Test Procedure

B.2.1. Connect the sensor under test to the circuit shown inFigure B1: Circuit Schematic For Self-Heating Test on page 26. The power supply should be off. To insure the accuracy of the datavoltmeter must have minimum resolution less than 0.3 millivolts and a minimum of 4.5 signifidigits for the display. The ammeter must have a minimum resolution of 0.5 microamps aminimum of 4.5 significant digits for the display.

B.2.2. Place the sensor into a constant-temperature glycol, ethylene or propylene bathsensors should be positioned in the bath so the top of the liquid is on the mounting threadssensor. Heat the bath to between 98 and 102 degrees Celsius and allow to stabilize for 2The temperature control and agitation of the liquid bath shall insure that the measured tempethroughout the testing area of the bath is uniform to plus or minus 0.1 degrees Celsius.

B.2.3. Turn on the power supply and adjust the current through the sensor to 10 percentspecified self heat current (0.08 to 0.12 times the self heat current). Allow the system to staand record the voltage and current indicated.

B.2.4. Increase the current through the sensor to 100 percent of the specified self heat currento 1.05 times the self heat current). Record the voltage and current over a 10 minute period

B.2.5. Repeat the procedure of B.2.3.

B.3. Data Reduction and Test Criteria

B.3.1. Compute the resistance of the sensor (the ratio of voltage to current) from B.2.3. andIf the ratios are not equal within 0.1 percent of the average value the test is invalid and murepeated.

B.3.2. From the data from B.2.4. compute the minimum resistance observed over the 10 mperiod.

B.3.3. Compute the difference of the average value from B.3.1. and the minimum resiscalculated in B.3.2.

B.3.4. If the measured change from B.3.3. is less than the allowable change specifiedapplicable drawing, the test is passed.



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14120


Appendix B (Continued)

Figure B1: Circuit Schematic For Self-Heating Test

variable DCpower supply

A ammeter

V voltmetersensor

