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.1. Scope1.1 This specification covers the requirements for equip-ment intended to provide control input and monito
3、ring oftemperatures in general applications. Equipment described inthis specification includes temperature indicators, signal con-ditioners and power supplies, and temperature sensors such asthermocouples and resistance temperature element assemblies.1.2 Special requirements for Naval shipboard appl
4、icationsare 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 ASTM Standards:2D3951 Practice for Commercial PackagingE344 Terminology Relating to T
5、hermometry 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 either temperature sensors or thermometers. Ther-mometers are not covered by this speci
6、fication. 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 is characterized by some mechanical action as tem-perature changes. Electrical response
7、 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 avariety of designs to provide measurement of direct or differ-ential temperature. Therm
8、ocouples 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 wires fabricated from dissimilar metals joined at one endto form a measuring junction tha
9、t 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 temperatures, electrical current will flow through thecircuit (Seebeck Effect). The measuremen
10、t 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 ranges. The three classes are base metal, noblemetal, and refractory metal. Although man
11、y 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 materials of each thermocouple wire is widely accepted.Likewise, the order in which the mater
12、ials 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 MaterialsTemperature(max)Base metal J Iron/constantan 1000C (1832F)Base metal T Copper/con
13、stantan 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 metal - Various noble metals 2000C (3632F)Refractorymetal- Tungsten-rhenium, tantalum
14、,molybdenum,and their alloys2600C (4712F)4.3 Resistance Temperature Measuring DevicesResistance thermometers measure changes in temperaturebased on changes in resistance of the sensor element exposed1This specification is under the jurisdiction of ASTM Committee F25 on Shipsand Marine Technology and
15、 is the direct responsibility of Subcommittee F25.10 onElectrical.Current 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, ww
16、w.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual 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 States1to th
17、e 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 RTDconsists of sensor which uses a metal wire or fiber whichresponds to changes in temperat
18、ure 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, annular RTDs, and combination RTD-thermocouples.Averaging RTDs are characterized by a lon
19、g 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 sheath.4.3.2 ThermistorsThermistors are made of solid semicon-ductor materials, usually c
20、omplex 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, respectively.The temperature range for typical thermistors is 100 to 300C(212 to 572F).4.3.2.1
21、 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 where metal platedfaces are used for contact to complete the circuit.5. Ordering Informati
22、on5.1 The purchaser should provide the manufacturer with allof the pertinent application data outlined in the acquisitionrequirements.5.2 Acquisition RequirementsAcquisition documentsshould specify the following:5.2.1 Title, number and date of this specification,5.2.2 Classification required,5.2.3 Q
23、uantity 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 marking requirements, and5.2.10 Special preservation, packaging, packing and mark-ing
24、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 equipment specified herein in con-junction with the thermocouples or resistance temperaturem
25、easuring 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 ConditionerThe signal conditioner shall con-vert the sensing element output to a continuous l
26、inear 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 toprovide a calibrated test signal used for calibrating the equip-ment.7.2 Size and Weigh
27、t ConsiderationsA dimensional outlineof the temperature monitoring equipment showing overall andprinciple dimensions in sufficient detail to establish spacerequirements in all directions necessary for installation andservicing will greatly assist proper selection. In many applica-tions weight is a c
28、ritical 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 Isolation,7.3.6 Enclosure,7.3.7 Power supply requirements, and7.3.8 Cable entrance an
29、d 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 Performance ConsiderationsCertain performancecharacteristics may be deemed critical t
30、o 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 exposures should be tailored to each purchasersintended application:8.2.1 Accuracy,8.2.2 Repe
31、atability,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 Insulation resistance,8.2.12 Vibration, and8.2.13 Shock.9. Workmanship, Finish, and Appearanc
32、e9.1 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 specimens to besubjected to qualification testing shall depend on the sensordesign. If
33、 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 may need to betested provided the electrical and mechanical similarities areapproved b
34、y 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 remain on file at themanufacturers facility for review by the purchaser uponrequest. I
35、t 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 inspection require-ments specified herein are classified as follows:12.1.1 Qualification
36、 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 performance charac-teristic specified. Test report documentation requirementsshould also be
37、 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 applications. Quality conformance testing isusually less intensive than qualification, often ver
38、ifying 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 repre-senting each lot have been either tested or inspected as directedin this specifi
39、cation 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 inthe acquisition requirements.15. Packaging and Package Marking15.1 Packaging of Pro
40、duct 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 acquisition requirements.16. Quality Assurance Provisions16.1 Warranty:16.1.1 Respons
41、ibility 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 defect of workmanship to produce the unit.17. Keywords17.1 resistance temperature detector
42、(RTD); thermistor;thermocoupleSUPPLEMENTARY REQUIREMENTSTEMPERATURE MONITORING EQUIPMENT (NAVAL SHIPBOARD USE)The following supplementary requirements established for U.S. Naval shipboard application shallapply when specified in the contract or purchase order. When there is conflict between the stan
43、dard(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 Shipboard, for new ship construction.S1. ScopeS1.1 This supplement covers temperature mo
44、nitoring 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 equipment, inconjunction with the temperature sensor assemblies and inter-connecting cabli
45、ng, 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 particularlocation is below or above a preset limit. Monitoring oftemperatures shall be accom
46、plished 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 shallactuate external audible alarms specified herein.F2362 03 (2013)3S1.3 Selective Temperature
47、Readout EquipmentSelectivetemperature readout equipment, in conjunction with tempera-ture sensor assemblies and interconnecting cabling, comprise atemperature measuring system. In order to enable operatingpersonnel to measure a number of temperatures at remotepoints, the system shall enable the oper
48、ator 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).Readout of temperatures shall be accomplished by measuringthe output of thermocouples or
49、 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 Measurement Thermocouples3S2.2 Government Documents:4S2.2.1 Military Standards:MIL-STD-167
