ANSI ASTM F2362-2003 Standard Specification for Temperature Monitoring Equipment.pdf

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1、Designation: F2362 03 (Reapproved 2013) An American National StandardStandard Specification forTemperature Monitoring Equipment1This standard is issued under the fixed designation F2362; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revisi

2、on, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S. Department of Defense.1. Scope1.1 This specificati

3、on covers the requirements for equip-ment intended to provide control input and monitoring oftemperatures in general applications. Equipment described inthis specification includes temperature indicators, signal con-ditioners and power supplies, and temperature sensors such asthermocouples and resis

4、tance temperature element assemblies.1.2 Special requirements for Naval shipboard applicationsare included in the Supplementary Requirements section.1.3 The values stated in SI units are to be regarded as thestandard. The values given in parentheses are for informationonly.2. Referenced Documents2.1

5、 ASTM Standards:2D3951 Practice for Commercial PackagingE344 Terminology Relating to Thermometry and Hydrom-etry3. Terminology3.1 DefinitionsDefinitions of terminology shall be in ac-cordance with Terminology E344.4. Classification4.1 GeneralTemperature measuring devices are generallyclassified as e

6、ither temperature sensors or thermometers. Ther-mometers are not covered by this specification. Temperaturesensors are classified by design and construction. Sensors mayalso be classified by the manner of response, basically me-chanical or electrical, to a change in temperature. Mechanicalresponse i

7、s characterized by some mechanical action as tem-perature changes. Electrical response is characterized by theproduction or change of an electrical signal or property astemperature changes. The following describes the most com-mon types of sensors:4.2 ThermocouplesThermocouples are constructed in av

8、ariety of designs to provide measurement of direct or differ-ential temperature. Thermocouples are commonly installedusing a thermowell which protects the thermocouple but alsodelays the rapid response time characteristic of thermocouples.4.2.1 Principle of OperationMost thermocouples utilizetwo wir

9、es fabricated from dissimilar metals joined at one endto form a measuring junction that is exposed to the processmedium being measured. The other ends of the wires areusually terminated at a measuring instrument which forms areference junction. When the two junctions are exposed todifferent temperat

10、ures, electrical current will flow through thecircuit (Seebeck Effect). The measurement of millivoltageresulting from the current is proportional to the temperaturebeing sensed.4.2.2 Types of ThermocouplesThermocouples can be di-vided into functional classes by materials and therefore,temperature ra

11、nges. The three classes are base metal, noblemetal, and refractory metal. Although many types are com-monly used in industrial applications, the Instrument Society ofAmerica (ISA) has assigned letter designations to seven types.By convention, the practice of using a slash mark to separatethe materia

12、ls of each thermocouple wire is widely accepted.Likewise, the order in which the materials appear also denotespolarity of the wires; positive/negative when the measuringjunction is at a higher temperature than the reference junction.The following are examples of typical thermocouples:Class Type Mate

13、rialsTemperature(max)Base metal J Iron/constantan 1000C (1832F)Base metal T Copper/constantan 1000C (1832F)Base metal K Chromel/Alumel 1000C (1832F)Base metal E Chromel/constantan 1000C (1832F)Base metal - Alloys of copper, nickel, iron,chromium,manganese, aluminum, andother metals1000C (1832F)Noble

14、 metal - Various noble metals 2000C (3632F)Refractorymetal- Tungsten-rhenium, tantalum,molybdenum,and their alloys2600C (4712F)1This specification is under the jurisdiction of ASTM Committee F25 on Shipsand Marine Technology and is the direct responsibility of Subcommittee F25.10 onElectrical.Curren

15、t edition approved Oct. 1, 2013. Published October 2013. Originallyapproved in 2003. Last previous edition approved in 2009 as F2362 - 03 (2009).DOI: 10.1520/F2362-03R13.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annu

16、al Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States14.3 Resistance Temperature Measuring DevicesResistance thermometers measure c

17、hanges in temperaturebased on changes in resistance of the sensor element exposedto the temperature. Two common types are resistance tempera-ture detectors which have metal sensor elements and thermis-tors which have semiconductor sensor elements.4.3.1 Resistance Temperature Detectors (RTDs)An RTDco

18、nsists of sensor which uses a metal wire or fiber whichresponds to changes in temperature by changing its resistance.The sensor is connected to a readout via a bridge circuit orother means of translating the resistance to a temperaturevalue.4.3.1.1 Types of RTDsRTD designs include averagingRTDs, ann

19、ular RTDs, and combination RTD-thermocouples.Averaging RTDs are characterized by a long resistance ele-ment. Annular RTDs have sensors that are designed to providea tight fit within the inner walls of thermowells. CombinationRTD-thermocouples have both an RTD and a thermocouplehoused in the same she

20、ath.4.3.2 ThermistorsThermistors are made of solid semicon-ductor materials, usually complex metal oxides, that have ahigh coefficient of resistance. Thermistors are available withpositive and negative temperature coefficients of resistance andare usually designated PTC and NTC thermistors, respecti

21、vely.The temperature range for typical thermistors is 100 to 300C(212 to 572F).4.3.2.1 Types of ThermistorsThermistors are classed bythe configuration of the semiconductor material. Commontypes are the bead, disc, washer, and rod thermistors. Leads areattached to semiconductor materials, except wher

22、e metal platedfaces are used for contact to complete the circuit.5. Ordering Information5.1 The purchaser should provide the manufacturer with allof the pertinent application data outlined in the acquisitionrequirements.5.2 Acquisition RequirementsAcquisition documentsshould specify the following:5.

23、2.1 Title, number and date of this specification,5.2.2 Classification required,5.2.3 Quantity of units required,5.2.4 Type of enclosure mounting,5.2.5 Power requirements,5.2.6 Equipment temperature ranges,5.2.7 Size or weight limitations,5.2.8 Disposition of qualification test samples,5.2.9 Product

24、marking requirements, and5.2.10 Special preservation, packaging, packing and mark-ing requirements.6. Materials and Manufacture6.1 Temperature SensorsThe materials for all wetted partsshall be selected for long term compatibility with the processmedium.7. Physical Properties7.1 DescriptionThe equipm

25、ent specified herein in con-junction with the thermocouples or resistance temperaturemeasuring elements comprise a temperature instrument. Thetemperature monitoring equipment may consist of the follow-ing units and may be built integrally together and housed in thesame enclosure:7.1.1 Signal Conditi

26、onerThe signal conditioner shall con-vert the sensing element output to a continuous linear analogsignal directly proportional to temperature.7.1.2 Power SupplyThe power supply shall provide exci-tation energy to the signal conditioner and sensor.7.1.3 Test DeviceA test device shall be furnished top

27、rovide a calibrated test signal used for calibrating the equip-ment.7.2 Size and Weight ConsiderationsA dimensional outlineof the temperature monitoring equipment showing overall andprinciple dimensions in sufficient detail to establish spacerequirements in all directions necessary for installation

28、andservicing will greatly assist proper selection. In many applica-tions weight is a critical limitation.7.3 General FeaturesRequirements for general featuresshall be specified. General features consist of the following:7.3.1 Output,7.3.2 Equipment range,7.3.3 Adjustments,7.3.4 Failsafe output,7.3.5

29、 Isolation,7.3.6 Enclosure,7.3.7 Power supply requirements, and7.3.8 Cable entrance and connection.8. Performance Requirements8.1 Service LifeThe purchaser may have a minimumspecified service life requirement. Critical service life require-ments shall be specified in the acquisition requirements.8.2

30、 Performance ConsiderationsCertain performancecharacteristics may be deemed critical to the intended ordesired function of temperature monitoring equipment. Perfor-mance tolerances are usually expressed in percent of equip-ment span. The following performance characteristics andenvironmental exposur

31、es should be tailored to each purchasersintended application:8.2.1 Accuracy,8.2.2 Repeatability,8.2.3 Threshold and deadband,8.2.4 Ripple,8.2.5 Warm-up time,8.2.6 Input resistance,8.2.7 Supply voltage or frequency, or both,8.2.8 Temperature error,8.2.9 Response time,8.2.10 Temperature,8.2.11 Insulat

32、ion resistance,8.2.12 Vibration, and8.2.13 Shock.9. Workmanship, Finish, and Appearance9.1 Finish and AppearanceAny special surface finish andappearance requirements shall be specified in the acquisitionrequirements.F2362 03 (2013)210. Number of Tests and Retests10.1 Test SpecimenThe number of test

33、specimens to besubjected to qualification testing shall depend on the sensordesign. If each range is covered by a separate and distinctdesign, a test specimen for each range may require testing. Ininstances where a singular design series may cover multipleranges and types, only three test specimens

34、may need to betested provided the electrical and mechanical similarities areapproved by the purchaser. In no case, however, should lessthan three units, one unit each representing low , medium, andhigh ranges, be tested, regardless of design similarity.11. Test Data11.1 Test DataAll test data shall

35、remain on file at themanufacturers facility for review by the purchaser uponrequest. It is recommended that test data be retained in themanufacturers files for at least three years, or a period of timeacceptable to the purchaser and manufacturer.12. Inspection12.1 Classification of InspectionsThe in

36、spection require-ments specified herein are classified as follows:12.1.1 Qualification testing, and12.1.2 Quality conformance testing.12.2 Qualification TestingQualification test requirementsshall be specified where applicable. Qualification test methodsshould be identified for each design and perfo

37、rmance charac-teristic specified. Test report documentation requirementsshould also be specified.12.3 Quality Conformance TestingQuality conformancetesting is accomplished when qualification testing was satisfiedby a previous acquisition or product has demonstrated reliabil-ity in similar applicatio

38、ns. Quality conformance testing isusually less intensive than qualification, often verifying thatsamples of a production lot meet a few critical performancerequirements.13. Certification13.1 When specified in the purchase order or contract, thepurchaser shall be furnished certification that samples

39、repre-senting each lot have been either tested or inspected as directedin this specification and the requirements have been met. Whenspecified in the purchase order or contract, a report of the testresults shall be furnished.14. Product Marking14.1 Purchaser specified product marking shall be listed

40、 inthe acquisition requirements.15. Packaging and Package Marking15.1 Packaging of Product for DeliveryProduct should bepackaged for shipment in accordance with Practice D3951.15.2 Any special preservation, packaging, or package mark-ing requirements for shipment or storage shall be identified inthe

41、 acquisition requirements.16. Quality Assurance Provisions16.1 Warranty:16.1.1 Responsibility for WarrantyUnless otherwisespecified, the manufacturer is responsible for the following:16.1.1.1 All materials used to produce a unit, and16.1.1.2 Manufacturer will warrant his product to be freefrom defec

42、t of workmanship to produce the unit.17. Keywords17.1 resistance temperature detector (RTD); thermistor;thermocoupleSUPPLEMENTARY REQUIREMENTSTEMPERATURE MONITORING EQUIPMENT (NAVAL SHIPBOARD USE)The following supplementary requirements established for U.S. Naval shipboard application shallapply whe

43、n specified in the contract or purchase order. When there is conflict between the standard(ASTM F2362) and this supplement, the requirements of this supplement shall take precedence forequipment acquired by this supplement. This document supercedes MIL-T-15377, TemperatureMonitor Equipment, Naval Sh

44、ipboard, for new ship construction.S1. ScopeS1.1 This supplement covers temperature monitoring equip-ment which continuously monitors and selectively indicates, ata central location, a number of temperatures at remote equip-ment locations on board naval ships.S1.2 Monitoring EquipmentMonitoring equi

45、pment, inconjunction with the temperature sensor assemblies and inter-connecting cabling, comprise a temperature measuring andalarm system. In order to warn operating personnel of abnor-mal temperature conditions, the system shall energize anaudible and visual alarm when the temperature at a particu

46、larlocation is below or above a preset limit. Monitoring oftemperatures shall be accomplished by measuring the electro-motive force (emf) output of thermocouples or by measuringthe signal output due to changes in resistance of temperaturesensing elements. Temperature monitoring equipment shallactuat

47、e external audible alarms specified herein.F2362 03 (2013)3S1.3 Selective Temperature Readout EquipmentSelectivetemperature readout equipment, in conjunction with tempera-ture sensor assemblies and interconnecting cabling, comprise atemperature measuring system. In order to enable operatingpersonnel

48、 to measure a number of temperatures at remotepoints, the system shall enable the operator to manually selectthe desired point to be measured, convert the selected tempera-ture sensor output to a signal proportional to temperature, anddisplay this signal on a meter calibrated in temperature C (F).Re

49、adout of temperatures shall be accomplished by measuringthe output of thermocouples or by measuring the signal outputdue to changes in resistance of temperature sensing elements.S1.4 The U.S. Government preferred system of measure-ment is the metric SI system. However, since this item wasoriginally designed using inch-pound units of measurement, inthe event of conflict between the metric and inch-pound units,the inch-pound units shall take precedence.S2. Referenced DocumentsS2.1 Commercial Documents:ANSI C96.1 Temperature Meas