Ametek STS Specifications

STS Series

Superior Temperature

Reference Sensors

Product Description

SUPERIOR TEMPERATURE REFERENCE SENSORS are a series of high quality sensors, ideal for

STS

important. STS sensors are based on more than 50 years of industrial temperature sensor manufacturing

experience.

industrial temperature calibration applications where accuracy and long-term stability are

Features

The main requirement of a reference sensor is stability: The less the sensor drifts, the lower the mea-

surement uncertainty. All JOFRA Superior Temperature Reference Sensors are economical and oer fast

—

response times, low immersion depths, compact physical sizes, and specied low drift rates

temperatures. These are all important considerations when selecting a reference sensor.

In addition to the standard straight sensors, we oer a special cable type reference sensor, permitting the

sensor to be positioned throughout the depth of the well in a dry block (for example) under a sanitary

ange. In addition, we have a specic series of intelligent sensors developed for use with the DTI050 refer-

ence indicator.

even at high

Key Features

 Wide Temperature Range

-150 to 700° C (-238 to 1292° F). A single sensor may cover the complete

temperature range.

 Fast Response Time

Ensures correct monitoring of temperature stability in liquid baths or dry-block

calibrators.

 Specied Low Drift

Maintains a minimal uncertainty budget over the entire period between re-calibration

intervals. Allows for easier recalibration scheduling.

 Calibration Certicate

Wide choice of accredited and traceable certicates.

STS-050 A

Measuring Temperature with JOFRA Reference Sensors

The JOFRA STS-050 A probes are designed for fast and accurate,

traceable calibration of temperature. STS-050 can be used for

measuring and calibration with AMETEK DTI Series, PTC B & C

Series, RTC B & C Series, HPC Series, ATMi and ASC series.

Standard delivery includes International traceable calibration

certicate, and accredited (ISO/EN/IEC 17025) calibration cer-

ticate can be chosen by selecting calibration option H. Several

connection options can be selected, to adapt our wide range of

calibrators.

Standard Delivery

STS-050 A sensor with handle  Sensors delivered in carton box

 Traceable calibration certicate, 7 calibration points from -45 to

400° C

 Cable – according to order number  User manual.

Specications

Dimensions

Reference A ....................................250 mm (9.84 in)

350 mm (13.78 in)

Reference B ...................................... 4 mm (0.16 in)

Reference C ....................................140 mm (5.51 in)

Temperature Range

All Sensors ...........................-50 to 400° C (-58 to 752° F)

Accuracy

Hysteresis Long Term Stability Repeatability

(1) When used in the range -50 to 400° C (-58 to 752° F). (2) When exposed to 400° C (752° F) for 100 hours. Stability will depend on

Sensing Element

Type ......................................................Pt100

Nominal Resistance @ 0° C (32° F) ..........................100 Ω

Temperature Coecient .....................

Minimum Immersion Depth

STS-050 A – 4 mm (0.16 in). . . . . . . . . . . . . . . . . . . . . .100 mm (3.94 in)

(1)

@ 0° C (32° F) .......................0.01° C (0.02° F)

(2)

@ 0° C (32° F) ..... typical 0.014 ° C (0.025° F)

(1)

@ 0° C (32° F) ...................0.005° C (0.009° F)

actual use of the sensor.

=0.00385 1/°C

100

Self-Heating Eect

0.06 °C /mW (0.11 °F/mW)

Response Time

STS-050 A – 4 mm (0.16 in): τ

–

STS-050 A

Liquid in motion v = 0.4 m/s.

Electrical Connections

Cable .................................................... 4-wire

Connection ..See "Cable Length and Termination" options below

Insulation Resistance

@ 23° C (73° F) .......................................100 Gohm

@ 400° C (752° F) ......................................70 Mohm

Outer Tube

Inconel 600

Operating Conditions

Sensor, Connection, and Cable ................Max. 70° C (158° F)

Storage Temperature ...................-20 to 70° C (-4 to 158° F)

Humidity .......................................... 0 to 90% RH

Protection Class .................................DIN 40050 IP-50

4 mm (0.16 in): τ

(50%) ...................8 seconds

0.5

(90%) ................. 26 seconds

0.9

Ordering Information

Base Model Number Sensor Diameter Shape and Length Cable Length and Termination Calibration Certicate

STS050 A

Pt100 reference sensor, solid, with handle,

-50 to 400° C (-58 to 752° F)

Sample Order Number

STS050A250DF ...4 mm STS-050 reference sensor, straight 250 mm, cable length 1 m (3.3 ft)

with REDEL connector for DTI050, and NPL traceable calibration certicate.

Overall diameter 4 mm (0.16 in) Straight sensor, 250 mm (9.8 in) in carton ....250 1 m (3.3 ft) REDEL connector for RTC/PTC/DTI050. . . . . . D Traceable certicate to international standards. Standard -45 to 400° C ...F

Straight sensor, 350 mm (13.8 in) in carton ...350 1 m (3.3 ft) 4 banana plugs for ASC Series .............F Accredited certicate. ISO17025. Option -45 to 400° C ..................H

1 m (3.3 ft) 4 pin LEMO connector for DTI 1000/HPC ... G

1 m (3.3 ft) 6 pin LEMO connector for ATMi ...........H

STS-100 A/B

Quality Dened

It is not easy to make a good quality reference sensor. The main requirement of a reference sensor

is stability. This means minimal drift as a function of operating time at the actual temperature. The

less the sensor drifts, the lower the measurement uncertainty.

Standard Diameter — Fast Response

The STS-100 A/B series has a relatively small diameter: STS-100 A is 4 mm / 0.16 in, and STS-100 B is

6.35 mm / 0.25 in. This leaves optimum space for sensors-under-test in the dry-block, and ensures

a fast response time. A fast reacting sensor will optimize the measurement information.

Reduced Hysteresis and Drift

The sensing element is comprised of a pure plat-

inum coil. This coil is suspended in a way that

minimizes stress and ensures a near zero hysteresis value.

The main reason for drift within a sensor assembly is impurities within the element, especially at

temperatures above 350° C (660° F). All internal parts must be cleaned thoroughly. AMETEK has

developed a unique cleaning method for the internal bore of the Inconel® sheath. The platinum

sensor is embedded within an ultra-clean, temperature resistant ceramic; and assembly of the

components is performed in a clean room. These precautions ensure minimum contamination of

the element during use, and provide the user with the best possible performance.

Aging /Annealing

Once the sensors are assembled, they are subjected

to a long approval process. This includes mechani-

cal stress reduction of the entire assembly as well

as aging the sensor element itself. The purpose of

aging the sensor is to remove the initial drift.

The procedure involves heating the sensor up to 650° C (1202° F) and holding it for 1 hour before

cooling down. This process is repeated over a period of several days. The resistance is then mea-

sured at 0° C (32° F) and recorded. The sensor is again heated up to 650° C (1202° F), and this time

the temperature is held constant for 100 hours.

(1202º F)

JOFRA STS-100 A Annealing the probes

650º C

0º C

(32º F)

First measurement

Second measurement

Time

Finally the output from the sensor is again measured at 0° C (32° F) and recorded. The dier-

ence between the rst and second measurement is recorded. The dierence between these two

measurements is our verication of the stability qualities of the sensor. To be accepted for nal

calibration and certication, the sensor must meet our minimum tolerance, which we document

in a quality certicate.

Reduced Isolation — Resistance-Error

Electrical isolation resistance (parasite-resistance-error) when measured at the highest operat-

ing temperature should be as high as possible. A low isolation resistance would cause the output

signal to be incorrect in relation to the temperature. JOFRA STS-100 A/B series sensors meet the

IEC-751 requirements of isolation resistance by several hundred percent.

The Final Quality-Certiﬁcate-Check

Upon completion of every certicate, after nal calibration of the sensor, examination and ap-

proval cycles are performed according to our established procedures. The critical verication is

to ensure that the dierence between the initial and the nal 0° C (32° F) measurement on the

certicate meets our minimum tolerance. These requirements are based on a vast amount of data,

which has been evaluated statistically. This value indicates if the sensor has a sucient long-term

stability. We also check that the linearization coecients have values that correlate to an accept-

able curve sequence in accordance with our requirements.

Certiﬁcation

The nal documentation on sensors is the calibration certicate. JOFRA sensors have the follow-

ing calibration options.

Accredited Certiﬁcate (Standard) Traceable to the European Accreditation Organization.

Temperature range from -45 to 650° C (-49 to 1202° F).

The certicate contains a minimum of 6 temperature points starting and ending at 0° C (32° F).

The certicate also contains calculated linearization coecients.

Delivery Without Certiﬁcate — Annealed Only (Optional) In some cases, the customer

may prefer to calibrate the sensor themselves. It is possible to purchase the sensor without any

certication. We do not recommend this option because we are not able to complete the nal

“quality-certicate-check.”

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