TEMPERATURE STANDARDS: TYPE S /AS / ES PRECISION, ULTRASTABLE NTC STANDARDS DESCRIPTION: Thermometrics temperature standards consist of ultra-stable thermistor probes assembled into thin wall stainless steel housings with shielded extension leads. The thermistors used receive special processing to ensure long term stability. All thermistor temperature standards are ruggedly constructed and are suitable for liquid immersion. APPLICATIONS: STABILITY: The stability of each temperature standard is guaranteed for a period of one year. When properly used, the following stability ratings apply: Type "AS" 0.002 C/year Type "S" 0.005 C/year Type "ES" 0.005 C/year CALIBRATION: Precision calibration, traceable to the National Institute of Standards and Technology, is provided for all temperature standards. A computer generated table in increments of 0.01C is furnished with each calibration based on the inter2 polation formula, RT=exp (A0+ A1/T + A2/T + 3 A3/T ). The constants for the formula are obtained from a polynomial regression performed on the calibration data obtained. Over the range of 0C to 60C, calibration is performed at the triple point of water (0.01C) and 15C, 25C, 30C, 37C, 50C, and 60C. For the range of 0C to 100C, calibrations are performed at the triple point of water, 25C, 30C, 37C, 60C, 80C, and 100C. Twowire calibrations are performed using a wheatstone Bridge calibrated to an accuracy of better than 0.005%. Four-wire calibrations are based on a comparison technique using a ratio bridge having an accuracy of 0.0002%. All resistance measurements are referenced to standard resistors calibrated by NIST. All temperature measurements are made using a standard platinum resistance thermometer which has been calibrated by NIST. Thermometrics Thermistor standards are rugged, precision sensors suitable for use as secondary or working temperature standards for all laboratory metrology applications. They generally are not affected by shock and vibration and, consequently, are also suitable for field use. Thermometrics Temperature standards fill the need for low cost temperature standards for general laboratory and hospital use, clinical applications and process temperature measurements. Special versions are available for military and space use. Standards are also available for other temperature ranges in a variety of sizes and enclosures. Our Applications Engineering Staff can assist you with your specific requirements. DATA: CONFIGURATION: Temperature standards are enclosed in thin-wall stainless tubes, welded closed at one end. The shielded cable is encapsulated into the tube to provide a solid moisture-proof seal. Full immersion of the metal portion of the standard is permissible. The calibration data is given for an immersion depth of 8" on 9" housings, and 4" on 41/2" long housings. TEMPERATURE RANGE: The Type "S" and Type "AS" are designed for operation over the range of 0C to 60C. The Type "ES" is rated for 0C to 100C. RESISTANCE VS. TEMPERATURE CHARACTERISTIC: The nominal resistance values are shown below: TYPE RESISTANCE IN OHMS OC 25C 60C 100C "AS" & "S" 14250 5000 1458 - "AS" & "S" 11400 4000 1166 - "ES" 28500 10000 2915 925 TEMPERATURE STANDARDS: TYPE S /AS / ES PRECISION, ULTRASTABLE NTC STANDARDS READ-OUT DEVICES: Thermometrics Temperature Standards are designed for use with Thermometrics Precision Thermometer Model TS8504. Also any suitable resistance measuring instrument may be used with Thermometrics TEMPERATURE STANDARDS. Care must be taken, however, to avoid excessive self-heating of the thermistor. A power dissipation of 4 microwatts will result in 0.001C self-heat. Self-heat error can be minimized by duplicating the conditions of calibration which are provided with each Thermometrics certificate of calibration. AVAILABLE MODELS THREE DIFFERENT TYPES ARE AVAILABLE EACH IN FOUR DIFFERENT SIZES TO ACCOMMODATE ALL STANDARD REQUIREMENTS: TYPE "S" which includes S10, S15, S20, S25 offer standard 0.005C/year stability and temperature range 0 to 60 C. TYPE "AS" which includes AS110, AS115, AS120, AS125 offer 0.002C/yr stability and temperature range 0 to 60 C. TYPE "ES" which includes ES210, ES215, ES220, ES225 offer 0.005 C/yr stability and temperature range 0 to 100C. NOTE: Add Suffix "8504" when Standard is to be used with Model TS8504 Precision Thermometer. CODING: All temperature standards Type "S", "AS", & "ES" may be ordered by part number and are available in two-wire and four-wire terminations. Unless otherwise specified a two-wire termination will be supplied. If a four-wire termination is desired specify by adding the suffix "4wire". Therefore an ES220 unit in 4-wire is ordered as "ES220-4 wire". When used with Thermometrics Model TS8504 Precision Thermometer add suffix "8504" so that in above example the part number would be ES2208504. The Standards so ordered will come with the leads attached to a special connector that incorporates an EEPROM. The EEPROM has the constants in memory based on the precision calibrations explained earlier. In order to use existing Thermometrics Temperature Standards with Thermometrics Model TS8504 an interfacing cable is available as part number C8504. When ordering an interfacing cable, it is important to specify the Type ("S","AS", or "ES") and Serial Number for which the cable is desired. Each standard requires its own unique interfacing cable. TYPE ACCURACY 0C - 60C 60C - 100C "AS" 0.001C - "S" 0.0015C - "ES" 0.0015C 0.0025C The uncertainties of the computer tables are 0.001C for the Type "AS" and 0.003C for the Types "S" and "ES". TEMP. RANGE FOR "S" & "AS" C EXTENDED TEMP. RANGE TYPE "ES" STABILITY /YEAR C TEMP. RANGE "ES" C 0.002 0-60 ES210 0.005 0-100 AS115 0.002 0-60 ES215 0.005 0-100 0.005 AS120 0.002 0-60 ES220 0.005 0-100 0.005 AS125 0.002 0-60 ES225 0.005 0-100 DIMENSIONS IN INCHES ("L") DIA X ("D") LONG STANDARD TYPE "S" STABILITY C/YEAR ABSOLUTE TYPE "AS" STABILITY C/YEAR 1/4" X 9" S10 0.005 AS110 1/8" X 4-1/2" S15 0.005 1/4" X 4-1/2" S20 1/8" X 9" S25 BOWTHORPE THERMOMETRICS Crown Industrial Estate, Priorswood Road Taunton, Somerset TA2 8QY UK Tel +44 (0) 1823 335200 Fax +44 (0) 1823 332637 THERMOMETRICS, INC. 808 US Highway 1 Edison, New Jersey 08817-4695 USA Tel +1 (732) 287 2870 Fax +1 (732) 287 8847 KEYSTONE THERMOMETRICS CORPORATION 967 Windfall Road St Marys, Pennsylvania 15857-3397 USA Tel +1 (814) 834 9140 Fax +1 (814) 781 7969 TEMPERATURE STANDARDS: TYPE S /AS/ ES PRECISION, ULTRASTABLE NTC STANDARDS RECALIBRATION SERVICES: We offer a recalibration recertification service for temperature standards Type "S" "AS" & "ES". For the Type "S", the units are initially evaluated at the triple point of water and 25C. The Type"ES" are evaluated at the triple point of water, 37C, and 100C. If the calibrations repeat their original values within the published accuracy, then recertification is provided. If not, then complete recalibration is required if the stability has not been impaired. The Type "AS" can only be recertified after complete recalibration. STANDARD CONFIGURATION STANDARD CONFIGURATIONS TO BE USED WITH THERMOMETRICS PRECISION THERMOMETER MODEL TS8504 BOWTHORPE THERMOMETRICS Crown Industrial Estate, Priorswood Road Taunton, Somerset TA2 8QY UK Tel +44 (0) 1823 335200 Fax +44 (0) 1823 332637 THERMOMETRICS, INC. 808 US Highway 1 Edison, New Jersey 08817-4695 USA Tel +1 (732) 287 2870 Fax +1 (732) 287 8847 KEYSTONE THERMOMETRICS CORPORATION 967 Windfall Road St. Marys, Pennsylvania 15857-3397 USA Tel +1 (814) 834 9140 Fax +1 (814) 781 7969