1、Designation: E 879 01 (Reapproved 2007)Standard Specification forThermistor Sensors for Clinical Laboratory TemperatureMeasurements1This standard is issued under the fixed designation E 879; the number immediately following the designation indicates the year oforiginal adoption or, in the case of re
2、vision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers the general requirements fornegative temperature coefficient thermistor
3、-type sensors in-tended to be used for clinical laboratory temperature measure-ments or control, or both, within the range from 10 to 105 C.1.2 This specification also covers the detailed requirementsfor ASTM designated sensors.1.3 This standard does not purport to address all of thesafety concerns,
4、 if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2E 344 Terminology Relating to Thermometry an
5、d Hydrom-etryE 563 Practice for Preparation and Use of an Ice-Point Bathas a Reference TemperatureF 29 Specification for Dumet Wire for Glass-to-Metal SealApplications3. Terminology3.1 DefinitionsThe definitions given in TerminologyE 344 shall apply to this specification.3.2 Definitions of Terms Spe
6、cific to This Standard:3.2.1 dissipation constant, d, nthe ratio of the change inenergy dissipated per unit time (power) in a thermistor,DP = P2 P1, to the resultant temperature change of thethermistor, DT = T2 T1.d5DPDT(1)The dimensions of the dissipation constant are W/K.For this specification, T1
7、is in the range from 20 to 38 C andDT = 10 C.3.2.2 dumet, nround, copper-coated 42 % nickel-ironwire intended primarily for sealing to soft glass.Also known asCuNiFe in some communities.3.2.3 insulation resistance, dc, nthe resistance at a speci-fied direct-current voltage between the insulated lead
8、s of athermistor sensor and the metallic enclosure of the sensor, ifsuch an enclosure is present, or else between the sensor leadsand a conductive medium in which the sensor is immersed.3.2.4 qualification test, na series of tests conducted by theprocuring agency or an agent thereof to determine con
9、form-ance of thermistor sensors to the requirements of a specifica-tion, normally for the development of a qualified products listunder the specification.3.2.5 response time, nthe time required for a sensor tochange a specified percentage of the total difference betweenits initial and final temperat
10、ures as determined from zero-power resistances when the sensor is subjected to a stepfunction change in temperature.3.2.6 time constant, nthe 63.2 % response time of asensor that exhibits a single-exponential response.3.2.7 zero-power resistance, nthe dc resistance of a de-vice, at a specified tempe
11、rature, calculated for zero-power.3.2.7.1 DiscussionAccurate zero-power resistance is ob-tained by extrapolating to zero-power the resistance valuesobtained from measurements at three or more levels of powerwith the sensor immersed in a constant temperature medium.For the purpose of this specificati
12、on, this is obtained frommeasurements at a single power level adjusted such that thepower is not greater than one-fifth the product of the dissipa-tion constant specified in Table 1 (see 3.2.1 and 7.3) and theappropriate tolerance requirement of Table 2. When makingstability measurements, the power
13、shall be kept constant.4. Classification4.1 Thermistor sensors covered by this specification shall beclassified with a type designation code that includes theASTMdetailed specification number followed by a descriptive code.See Fig. 1.1This specification is under the jurisdiction of ASTM Committee E2
14、0 onTemperature Measurement and is the direct responsibility of Subcommittee E20.08on Medical Thermometry.Current edition approved May 1, 2007. Published June 2007. Originallyapproved in 1982. Last previous edition approved in 2001 as E 879 01.2For referenced ASTM standards, visit the ASTM website,
15、www.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.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.TA
16、BLE 1 Specification for ASTM Clinical Laboratory Thermistor SensorsASTM No. E 879 S B1N E 879 E B1N E 879 S B2N E 879 E B2NDescription Silicone Rubber Coated GlassProbeEpoxy Coated Glass Probe Silicone Rubber Coated GlassProbeEpoxy Coated Glass ProbeMajor Application General Purpose ClinicalLaborato
17、ry TemperatureMeasurementGeneral Purpose ClinicalLaboratory TemperatureMeasurementGeneral Purpose ClinicalLaboratory TemperatureMeasurementGeneral Purpose ClinicalLaboratory TemperatureMeasurementOperating Temperature Range 10 to 60 C 10 to 60 C 10 to 60 C 10 to 60 CAccuracy Class 1 (60.01 C) 1 (60.
18、01 C) 2 (60.02 C) 2 (60.02 C)Temperatures for Accuracy Class 10 to 60 C 10 to 60 C 10 to 60 C 10 to 60 CAccuracies for other TemperaturesWithin Specified TemperatureRangeCalibration Type Non-interchangeable Non-interchangeable Non-interchangeable Non-interchangeableNominal R-T CharacteristicR = expA
19、0+ A1/T + A2/T2+A3/T3 (T in kelvins)T( C) = a0+a1LnR +a2(LnR)2+a3(LnR)31 273.15A04.4495078 4.4495078 4.4495078 4.4495078A13614.7764 3614.7764 3614.7764 3614.7764A288190.906 88190.906 88190.906 88190.906A322328247 22328247 22328247 22328247a00.11766716 3 1020.11766716 3 1020.11766716 3 1020.11766716
20、3 102a10.28173082 3 1030.28173082 3 1030.28173082 3 1030.28173082 3 103a20.23285292 3 1050.23285292 3 1050.23285292 3 1050.23285292 3 105a30.24131652 3 1060.24131652 3 1060.24131652 3 1060.24131652 3 106Type of Immersion Fluid water, air water, oil, air water, air water, oil, airNominal R0at 25 C 2.
21、5 kV 2.5 kV 2.5kV 2.5 kVDissipation Constant 3.5 6 0.9 mW/K 5.0 6 1.2 mW/K 3.56 0.9 mW/K 5.0 6 1.2 mW/K63.2 % Response Time 0.55 6 0.16 s 0.45 6 0.11 s 0.55 6 0.16 s 0.45 6 0.11 sRatio of 95 % to 63.2 % ResponseTimes2.5 6 0.6 2.1 6 0.5 2.5 6 0.6 2.1 6 0.5Design and Construction Fig. 2 Fig. 3 Fig. 2
22、Fig. 3ASTM No. E 879 S A2N E 879 E A2N E 879 G B1N E 879 H B1NDescription Silicone Rubber Coated GlassProbeEpoxy Coated Glass Probe5kV -4-WireNon-interchangeable Sensorin S.S. Housing5kV -2-WireNon-interchangeableSensorin S.S. HousingMajor Application General Purpose ClinicalLaboratory TemperatureMe
23、asurementGeneral Purpose ClinicalLaboratory TemperatureMeasurementGeneral Purpose ClinicalLaboratory TemperatureMeasurementGeneral Purpose ClinicalLaboratory TemperatureMeasurementOperating Temperature Range 10 to 105 C 10 to 105 C 10 to 60 C 10 to 60 CAccuracy Class 2 (60.02 C) 2 (60.02 C) 1 (60.01
24、 C) 1 (60.01 C)Temperatures for Accuracy Class 10 to 105 C 10 to 105 C 10 to 60 C 10 to 60 CAccuracies for other TemperaturesWithin Specified TemperatureRangeCalibration Type Non-interchangeable Non-interchangeable Non-interchangeable Non-interchangeableNominal R-T CharacteristicR = expA0+ A1/T + A2
25、/T2+A3/T3T( C) = a0+a1LnR +a2(LnR)2+a3(LnR)31 273.15A04.3332974 4.3332947 3.7563605 3.7563605A14440.1603 4440.1603 3614.7764 3614.7764A2104525.78 104525.78 88190.906 88190.906A34581329.78 4581329.78 22328247 22328247a00.98667965 3 1030.98667965 3 1030.98019160 3 1030.98019160 3 103a10.24329879 3 103
26、0.24329879 3 1030.28530667 3 1030.28530667 3 103a20.59584872 3 1060.59584872 3 1060.28303328 3 1050.28303328 3 105a30.97166167 3 1070.97166167 3 1070.24131652 3 1060.24131652 3 106Type of Immersion Fluid water, air water, air all fluids compatible with Type304 S.S.all fluids compatible withType 304
27、S.S.R0at 25 C 10kV 10 kV 5 kV 5 kVDissipation Constant 3.5 6 0.9 mW/K 5.0 6 1.2 mW/K 4.86 1.2 mW/K 4.8 6 1.2 mW/K63.2 % Response Time 0.55 6 0.16 s 0.45 6 0.11 s 4.5 6 1.1 s 4.5 6 1.1 sRatio of 95 % to 63.2 % ResponseTimes2.5 6 0.6 2.1 6 0.5 2.6 6 0.3 2.6 6 0.3Design and Construction Fig. 2 Fig. 3 F
28、ig. 4 Fig. 5E 879 01 (2007)2TABLE 1 (continued)ASTM No. E 879 G B1N E 879 H B1N E 879 G A2N E 879 H A2NDescription 10 kV 4-Wire Non-interchangeable Sensor inS.S. Housing10 kV 2-Wire Non-interchangeable Sensor inS.S. Housing10 kV 4-Wire Non-interchangeable Sensor inS.S. Housing10 kV 2-Wire Non-interc
29、hangeable Sensor inS.S. HousingMajor Application General Purpose ClinicalLaboratory TemperatureMeasurementGeneral Purpose ClinicalLaboratory TemperatureMeasurementGeneral Purpose ClinicalLaboratory TemperatureMeasurementGeneral Purpose ClinicalLaboratory TemperatureMeasurementOperating Temperature R
30、ange 10 to 60 C 10 to 60 C 10 to 105 C 10 to 105 CAccuracy Class 1 (60.01 C) 1 (60.01 C) 2 (60.02 C) 2 (60.02 C)Temperatures for AccuracyClass10 to 60 C 10 to 60 C 10 to 105 C 10 to 105 CAccuracies for otherTemperaturesWithin Specified TemperatureRangeCalibration Type Non-interchangeable Non-interch
31、angeable Non-interchangeable Non-interchangeableNominal R-T CharacteristicR = expA0+ A1/T + A2/T2+A3/T3T(C) = a0+a1LnR +a2(LnR)2+a3(LnR)31 273.15A03.5684919 3.5684919 3.7191520 3.7191520A13907.7065 3907.7065 4045.1666 4045.1666A233480.382 33480.382 8181.7100 -8181.7100A318666997 18666997 14472122 14
32、472122a00.86972495 3 1030.86972495 3 1030.89898144 3 1030.89898144 3 103a10.27135335 3 1030.27135335 3 1030.26152805 3 1030.26152805 3 103a20.20689100 3 1050.20689100 3 1050.97537969 3 1060.97537969 3 106a30.20547429 3 1060.20547429 3 1060.16613292 3 1060.16613292 3 106Type of Immersion Fluid all fl
33、uids compatible with Type304 S.S.all fluids compatible with Type304 S.S.all fluids compatible with Type304 S.S.all fluids compatible with Type304 S.S.Nominal R0at 25 C 10 kV 10kV 10 kV 10 kVDissipation Constant 4.8 6 1.2 mW/K 4.8 6 1.2 mW/K 4.86 1.2 mW/K 4.8 6 1.2 mW/K63.2 % Response Time 4.5 6 1.1
34、s 4.5 6 1.1 s 4.56 1.1 s 4.5 6 1.1 sRatio of 95 % to 63.2 %ResponseTimes2.6 6 0.3 2.6 6 0.3 2.6 6 0.3 2.6 6 0.3Design and Construction Fig. 4 Fig. 5 Fig. 4 Fig. 5ASTM No. E 879 V B3I E 879 W B3NDescription Interchangeable SensorEnclosed in 1.17 mm PlasticTubeNon-interchangeable SensorEnclosed in 0.9
35、2 mm PlasticTubeMajor Application Cuvette Thermometry Cuvette ThermometryOperating Temperature Range 10 to 60 C 10 to 60 CAccuracy Class 3 (60.05 C) 3 (60.05 C)Temperatures for AccuracyClass24 to 45 C 10 to 60 CAccuracies for otherTemperaturesWithin Specified TemperatureRange10 to 24 C: 60.1 C45 to
36、60 C: 60.1 CCalibration Type Interchangeable Non-interchangeableNominal R-T CharacteristicR = expA0+ A1/T + A2/T2+A3/T3T(C) = a0+a1LnR +a2(LnR)2+a3(LnR)31 273.15A03.1645305 3.0612396A13763.4399 3613.0051A247816.278 88718.122A318332303 22380305a00.78686094 3 1030.78069589 3 103a10.28128740 3 1030.289
37、67541 3 103a20.25226292 3 1050.38427027 3 105a30.20852922 3 1060.24169639 3 106Type of Immersion Fluid water waterNominal R0at 25 C 11 kV 10 kVDissipation Constant 1.1 6 0.3 mW/K 0.8 6 0.2 mW/K63.2 % Response Time 0.5 6 0.12 s 0.26 6 0.06 sRatio of 95 % to 63.2 %ResponseTimes3.0 6 0.3 3 6 0.3Design
38、and Construction Fig. 6 Fig. 7E 879 01 (2007)34.2 ASTM Specification NumberThe ASTM specificationnumber specifies uniquely the design and construction of thesensor including the type designation if more than one typeappears in the same specification.4.2.1 Type DesignationThe type designation shall b
39、e aletter symbol to indicate the design and construction of thethermistor sensor.4.2.1.1 Type SSilicone rubber-coated glass probe withtinned Dumet extension leads (see Fig. 2).4.2.1.2 Type EEpoxy-coated glass probe with silver-plated copper extension leads (see Fig. 3).4.2.1.3 Type GGeneral purpose
40、four wire sensor in stain-less steel housing (see Fig. 4).4.2.1.4 Type HGeneral purpose two-wire sensor in stain-less steel housing (see Fig. 5).4.2.1.5 Type VInterchangeable sensor enclosed in 1.2-mmvinyl tube (see Fig. 6).4.2.1.6 Type WNon-interchangeable sensor enclosed in0.9-mm vinyl tube (see F
41、ig. 7).4.3 Operating Temperature RangeThe operating tempera-ture range shall be designated by a letter symbol (see Table 3).4.4 Accuracy ClassThe accuracy class shall be designatedby a single-digit number (see Table 2).4.5 Calibration TypeThe type of calibration required foreach unit shall be design
42、ated by a letter symbol. The letter Ishall be used to denote units that are interchangeable withrespect to a single resistance-temperature relationship. Theletter N shall be used to denote non-interchangeable units forwhich resistance-temperature information must be furnishedfor each unit. For Calib
43、ration Type N sensors, serial numberidentification must be provided.5. Requirements5.1 SpecificationsSensors shall comply with the generalrequirements specified herein as well as with the applicabledetailed specifications of Table 1. In the event of conflictbetween this requirement paragraph and the
44、 detailed specifi-cation of Table 1, Figs. 2-7 the latter shall govern.5.2 Zero-Power Resistance versus TemperatureRelationshipThe zero-power resistance versus temperaturerelationship shall be presented in a form such that anytemperature within the specified operating temperature rangecan be obtaine
45、d from that relationship and have an uncertaintyno greater than one-tenth the specified tolerance in Table 2.When tested in accordance with 7.2, the zero-power resistanceversus temperature relationship for interchangeable parts shallcomply to within the tolerance specified in Table 2. Themanufacture
46、r of the sensor shall, for non-interchangeable parts,supply this relationship with each part shipped.5.2.1 AccuracyThe resistance-temperature relationship,provided in Table 1, or with the sensor, or both, shall not differfrom that obtained from measurements made in accordancewith 7.2 by more than th
47、e tolerances specified inTable 2 for theapplicable intervals specified in Table 1.5.3 Thermal Requirements:5.3.1 Dissipation ConstantWhen tested in accordancewith 7.3, the dissipation constant shall be as specified in thedetailed specification.5.3.2 Response TimeWhen tested in accordance with 7.4,th
48、e response time or time constant, or both, shall be as specifiedin the detailed specification.5.4 Environmental Requirements:5.4.1 Operating Temperature RangeThe operating tem-perature range shall be as specified in the type designation code(see 4.1 and 4.3).5.4.2 Storage Temperature RangeSensors sh
49、all be ca-pable of meeting all requirements specified herein as well asthose listed in the applicable detailed specification after storageat any temperature (or combination thereof) in the rangefrom 40 to 60 C for a period of 1 year.5.4.3 Humidity RequirementSensors shall be capable ofbeing operated or stored at relative humidity from 0 to 95
