Temperature Standards - Thermometrics, Inc.

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 process-

ing to ensure long term stability. All thermistor tem-

perature standards are ruggedly constructed and are

suitable for liquid immersion.

APPLICATIONS:

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 af-

fected by shock and vibration and, consequently,

are also suitable for field use. Thermometrics Tem-

perature standards fill the need for low cost temper-

ature 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 en-

closed 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

0°C to 60°C. The Type “ES” is rated for 0°C to

100°C.

STABILITY: The stability of each temperature stan-

dard 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 com-

puter generated table in increments of 0.01°C is

furnished with each calibration based on the inter-

polation formula, RT=exp (A0+ A1/T + A2/T2+

A3/T3). The constants for the formula are obtained

from a polynomial regression performed on the cal-

ibration data obtained. Over the range of 0°C to

60°C, calibration is performed at the triple point of

water (0.01°C) and 15°C, 25°C, 30°C, 37°C, 50°C,

and 60°C. For the range of 0°C to 100°C, calibra-

tions are performed at the triple point of water,

25°C, 30°C, 37°C, 60°C, 80°C, and 100°C. Two-

wire 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 measure-

ments are referenced to standard resistors calibrat-

ed by NIST. All temperature measurements are

made using a standard platinum resistance ther-

mometer which has been calibrated by NIST.

RESISTANCE VS. TEMPERATURE CHARACTERISTIC: The nominal resistance values are shown below:

TYPE RESISTANCE IN OHMS

O°C 25°C 60°C 100°C

“AS” & “S” 14250 5000 1458 –

“AS” & “S” 11400 4000 1166 –

“ES” 28500 10000 2915 925

TYPE ACCURACY

0°C – 60°C 60°C – 100°C

“AS” 0.001°C –

“S” 0.0015°C –

“ES” 0.0015°C 0.0025°C

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 other-

wise specified a two-wire termination will be sup-

plied. 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 ES220-

8504.

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.

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 STAN-

DARDS. Care must be taken, however, to avoid

excessive self-heating of the thermistor. A power

dissipation of 4 microwatts will result in 0.001°C

self-heat. Self -heat error can be minimized by dupli-

cating the conditions of calibration which are pro-

vided with each Thermometrics certificate of cali-

bration.

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 0.005°C/year stability and tempera-

ture range 0° to 60° C.

TYPE “AS” which includes AS110, AS115, AS120,

AS125 offer 0.002°C/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 100°C.

NOTE: Add Suffix “8504” when Standard is to be

used with Model TS8504 Precision Thermometer.

The uncertainties of the computer tables are 0.001°C for the Type “AS” and 0.003°C for the Types “S”

and “ES”.

TEMP. EXTENDED

DIMENSIONS IN INCHES STANDARD STABILITY ABSOLUTE STABILITY RANGE TEMP. STABILITY TEMP.

(“L”) DIA X (“D”) LONG TYPE “S” °C/YEAR TYPE °C/YEAR FOR “S” RANGE °/YEAR RANGE

“AS” & “AS” TYPE °C “ES”

°C “ES” °C

1/4" X 9" S10 0.005 AS110 0.002 0-60 ES210 0.005 0-100

1/8" X 4-1/2" S15 0.005 AS115 0.002 0-60 ES215 0.005 0-100

1/4" X 4-1/2" S20 0.005 AS120 0.002 0-60 ES220 0.005 0-100

1/8" X 9" S25 0.005 AS125 0.002 0-60 ES225 0.005 0-100

BOWTHORPE THERMOMETRICS THERMOMETRICS, INC. KEYSTONE THERMOMETRICS CORPORATION

Crown Industrial Estate, Priorswood Road 808 US Highway 1 967 Windfall Road

Taunton, Somerset TA2 8QY UK Edison, New Jersey 08817-4695 USA St Marys, Pennsylvania 15857-3397 USA

Tel +44 (0) 1823 335200 Tel +1 (732) 287 2870 Tel +1 (814) 834 9140

Fax +44 (0) 1823 332637 Fax +1 (732) 287 8847 Fax +1 (814) 781 7969

TEMPERATURE STANDARDS:

TYPE S/AS /ES

PRECISION, ULTRASTABLE NTC STANDARDS

TEMPERATURE STANDARDS: TYPE S/AS/ES

PRECISION, ULTRASTABLE NTC STANDARDS

BOWTHORPE THERMOMETRICS THERMOMETRICS, INC. KEYSTONE THERMOMETRICS CORPORATION

Crown Industrial Estate, Priorswood Road 808 US Highway 1 967 Windfall Road

Taunton, Somerset TA2 8QY UK Edison, New Jersey 08817-4695 USA St. Marys, Pennsylvania 15857-3397 USA

Tel +44 (0) 1823 335200 Tel +1 (732) 287 2870 Tel +1 (814) 834 9140

Fax +44 (0) 1823 332637 Fax +1 (732) 287 8847 Fax +1 (814) 781 7969

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 25°C.

The Type”ES” are evaluated at the triple point of water, 37°C, and 100°C. If the calibrations repeat their orig-

inal 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 recali-

bration.

STANDARD CONFIGURATION

STANDARD CONFIGURATIONS TO BE USED WITH

THERMOMETRICS PRECISION THERMOMETER MODEL TS8504