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Technical content

The temperature class represents the maximum permissible continuous operating or storage tem- perature available. The stability group represents the maximum drift rate, in percent resistance change per year, of the thermistor, when operated or stored at all temperatures up to the maximum rating. Ultra- stable Probe Thermistors should not be exposed to temperatures higher than the maximum rating, as this will degrade their stability and void the stability classification. When specified, additional precon- ditioning can be preformed to stabilize units for a particular application.

Applications

The NTC Type SP60, SP65, SP85, and SP100 Ultra- stable Probe Thermistors may be used in all temper- ature measurement and control applications with the added assurance of long term stability and reliability. They are the ideal choice for use as secondary stan- dards in laboratories. Amphenol Advanced Sensors The NTC Type SP60, SP65, SP85, and SP100 Ultra-stable Probe Thermistors have similar construction and dimensions to the Type P60, P65, P85, and P100 Probe Thermistors. Ultra-stable Probe Thermistors receive additional processing to assure their continuous use in one of three temperature classes and are catego- rized into one of six stability groups.

SP60/65/85/100 Specifications NTC Type SP60/65/85/100 dimensions Thermal and Electrical Properties The following table lists the thermal and electrical properties for all ultra-stable probe thermistors. All definitions and test methods are per MIL- PRF-23648 Table A Thermistor Type SP60 SP65 SP85 SP100 Body Dimensions Standard Lengths Lead-wires Minimum Lead Length .875 in (22 mm) .875 in (22 mm) .875 in (22 mm) .875 in (22 mm) Lead Material Class “A” 200°F (105°C) Tinned Dumet Tinned Dumet Tinned Dumet Tinned Dumet Class “B” 392°F (200°C) Platinum Alloy Platinum Alloy Platinum Alloy Platinum Alloy Class “C” 572°F (300°C) Platinum Alloy Platinum Alloy Platinum Alloy Platinum Alloy Thermal Time Constant Still Air at 77°F (25°C) 12 sec 13 sec 16 sec 22 sec Plunge into Water 300 msec 320 msec 400 msec 600 msec Dissipation Constant Still Air at 77°F (25°C) .60 mW/°C .65 mW/°C .85 mW/°C 1.00 mW/°C Still Water at 77°F (25°C) 3.00 mW/°C 3.30 mW/°C 4.00 mW/°C 5.00 mW/°C Power Rating (in air) 100% Maximum Power Rating @ 77°F (25°C) .048 Watts .052 Watts .068 Watts .080 Watts Derated to 0% @ Maximum Temperature See Class See Class See Class See Class

Stability Classes (By Nominal Resistance at 77°F (25°C) Ultra-stable probe thermistors availability depends upon nominal resistance at 77°F (25°C). Stability class is indicated by a code letter for temperature class and a code number for stability group. Example: “A1” = .02% maximum change per year at 221°F (105°C) maximum temperature. Table B Material System (All Types 60/65/85/100) Code Letter R-vs-T Curve Ratio Nominal Resistance Range @ 77°F (25°C) Ohms (W) Code Class “A” 221°F (105°C) maximum Class “B” 392°F (200°C) maximum Class “C” 572°F (300°C) maximum A 1 11.8 51 to 150 – – A3 A4 A5 A6 – – B6 – – C6 A 2 12.5 150 to 360 – – A3 A4 A5 A6 – – B6 – – C6 A 3 14.0 360 to 750 – – A3 A4 A5 A6 – – B6 – – C6 A 4 16.9 750 to 1.5k A1 A2 A3 A4 A5 A6 – B5 B6 – – C6 A 5 19.8 1.5k to 3.6k A1 A2 A3 A4 A5 A6 – B5 B6 – – C6 A 6 22.1 3.6k to 6.2k A1 A2 A3 A4 A5 A6 – B5 B6 – – C6 A 7 22.7 6.2k to 9.1k A1 A2 A3 A4 A5 A6 – B5 B6 – – C6 B 8 29.4 9.1k to 27k A1 A2 A3 A4 A5 A6 – B5 B6 – – C6 B 9 30.8 27k to 43k – A2 A3 A4 A5 A6 – B5 B6 – – C6 B 10 32.3 43k to 75k – A2 A3 A4 A5 A6 – B5 B6 – – C6 B 11 35.7 75k to 160k – A2 A3 A4 A5 A6 – B5 B6 – – C6 B 12 38.1 160k to 360k – A2 A3 A4 A5 A6 – B5 B6 – – C6 B 13 45.0 360k to 750k – A2 A3 A4 A5 A6 – B5 B6 – – C6 B 14 48.1 750k to 1.5M – A2 A3 A4 A5 A6 – B5 B6 – – C6 B 15 56.5 1.5M to 3.0M – – – A4 A5 A6 – – B6 – – C6 D 16 75.6 3.0M to 8.2M – – – A4 A5 A6 – – B6 – – C6 D 17 81.0 8.2M to 20M – – – A4 A5 A6 – – B6 – – C6 “1” = 0.02%/year “2” = 0.05%/year “3” = 0.075%/year “4” = 0.1%/year “5” = 0.2%/year “6” = 0.5%/year

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Ordering Information

The code number to be ordered may be specified as follows: Code Model Number SP 60 SP 65 SP 85 SP 100 Code Probe Length A 1/8 in (3.175 mm) B 1/4 in (6.35 mm) D 1/2 in (12.7 mm) Code Material System Code X See table B for codes Code Zero-power resistance @ 77°F (25°C)**

202 See Note 2

Code Tolerance* F 1 G 2 J 5 K 10 L 15 M 20 N 25 P 30 Q 40 R 50 S Non-standard (specify value) Code Temperature Class Stability A 221°F (105°C) maximum B 392°F (200°C) maximum C 572°F (300°C) maximum Code Group (Resistance Change) 1 .02% per year 2 .05% per year 3 .075% per year 4 .1% per year 5 .2% per year 6 .5% per year *Special tolerances are available on request. Consult the factory for special resistance tolerances, non-standard resistances and/or non- standard temperatures. **The zero-power resistance at 77°F (25°C), expressed in ohms, is identified by a three digit code number. The first two digits represent significant figures, and the last digit specifies the number of zeros to follow. Example: 2k Ohms =“202”. The standard resistance val-