PT-111-14L - Lake Shore Cryotronics, Inc.

Lake Shore ☎ (614) 891-2244 Fax: (614) 818-1600 www.lakeshore.com EMail: sales@lakeshore.com

Platinum RTDs

•Follows Lake Shore

extended standard curve

from 30 K to 70 K

•High reproducibility

•Low magnetic field

dependence above 40 K

•Low susceptibility to

ionizing radiation

•Conforms to DIN 43760

and IEC 751 Standards

down to 70 K

•Lake Shore provides

individual calibrations

from 14 K to as high as

800 K

•SoftCal calibration

available

PT-100 Platinum RTDs

PT-100 platinum resistance thermometers

(PRTs) are an excellent choice for use as

cryogenic temperature sensing and control

elements in the range from 30 K to 873 K

(-243 °C to 600 °C). Over this temperature

span, PRTs offer high repeatability and

nearly constant sensitivity, dR/dT. Platinum

resistors are also of use as control

elements in magnetic field environments

where errors approaching a degree can be

tolerated. PRTs are interchangeable above

70 K. The use of controlled-purity platinum

assures uniformity from device to device.

PRTs experience rapidly decreasing

sensitivity below approximately 30 K. They

should be calibrated in order to achieve

maximum accuracy for use below 100 K.

The plot below illustrates platinum sensor

conformance to the DIN 43760:1980 curve.

PT-102

T ypical Resistance and Sensitivity values for PT-100s. See page A-57 for tabular data.

Typical Magnetic Field-Dependent

Temperature Errors ∆T/T (%)

at B (magnetic induction)

B (tesla)

T(K) 2.5 5 8 14 19

20 20 – 100 250 –

40 0.5 1.5 3 6 8.8

87 0.04 0.14 0.4 1 1.7

300 -0.01 0.001 0.02 0.07 0.13

Recommended for use when T ≥ 30 K.

Long axis parallel to B; orientation effects exist.

B.L. Brandt, L.G. Rubin and H.H. Sample, Low-

T emperature Thermometry in High Magnetic Fields.

VI. Industrial-grade Pt resistors above 66 K; Rh-Fe

and Au-Mn resistors above 40 K, Rev . Sci. Instrum.

59, 642 (1988).

1. If your application requires more than one

platinum resistor, up to five platinum resistors can

be matched with one another to within ± 0.1 K at

liquid nitrogen temperature with only one calibration

being purchased. If absolute accuracy is required,

one of these matched sensors can be calibrated.

For larger quantities, or for different requirements,

consult Lake Shore. At the time of order, add the

suffix -LN to the sensor.

Example: PT-102-14D-LN is a PT-102-LN sensor with a

calibration range of 14 K to 100 K that is matched with

at least one other uncalibrated PT-102 to within ±0.1 K

at liquid nitrogen temperature.

2. For metrological applications below 30 K, use a

germanium resistor (page 1-22). PT-100 sensors are

not useful below 14 K for metrology and are of

limited use below 30 K for temperature control due to

rapid decline in sensitivity.

3. For high temperature use anneal at Tmax +10 °C.

1-28 PT-100 Platinum RTDs

PT-103

PT-111

See the Reference Section

for a detailed description of

Self-heating

Installation

Uncalibrated sensors

SoftCal™

Calibrated sensors

CalCurve

Sensor packages

Lake Shore ☎ (614) 891-2244 Fax: (614) 818-1600 www.lakeshore.com EMail: sales@lakeshore.com

Platinum RTDs

PT-100 Platinum RTDs 1-29

(1) If not heated above 475 K

(2) The leads are moderately robust, but care should be taken when handling.

Specifications

PT-102 PT-103 PT-111

Temperature

Useful range

Minimum 14 K 14 K 14 K

Maximum 873 K 873 K 673 K

Maximum storage temperature 500 K 500 K 400 K

Standard curve DIN 43760 DIN 43760 DIN 43760

Resistivity (typical) See plots on previous page See plots on previous page See plots on previous page

Sensitivity (typical) See plots on previous page See plots on previous page See plots on previous page

Dimensionless sensitivity (typical) See plots on previous page See plots on previous page See plots on previous page

Repeatability ±10 mK (77 K to 305 K) ±10 mK (77 K to 305 K) ±10 mK (77 K to 305 K)

Accuracy (interchangeability) See figure on previous page See figure on previous page See figure on previous page

Accuracy (SoftCal)

2-point (77, 305) ±250 mK (70 K to 325 K) ±250 mK (70 K to 325 K) ±250 mK (70 K to 325 K)

3-point (77, 305, 480) ±250 mK (70 K to 480 K) ±250 mK (70 K to 480 K) ±250 mK (70 K to 480 K)

Accuracy (calibrated) ±20 mK at 100 K; ±35 mK at 300 K ±20 mK at 100 K; ±35 mK at 300 K ±20 mK at 100 K; ±35 mK at 300 K

Stability

Short-term ±10 mK (77 K to 305 K) ±10 mK (77 K to 305 K) ±10 mK (77 K to 305 K)

Long-term (per year)(1) ±10 mK at 77 K ±10 mK at 77 K ±10 mK at 77 K

±10 mK at 30 K to 273 K ±10 mK (30 K to 273 K) ±10 mK (30 K to 273 K)

Thermal response time 1.75 S at 77 K; 12.5 S at 273 K 1.75 S at 77 K; 12.5 S at 273 K 2.5 S at 77 K; 20 S at 273 K

Recommended recalibration schedule Annual Annual Annual

Excitation

Recommended 1 mA 1 mA 1 mA

Maximum power before damage 5 mW, 3 mA or 1 V, whichever is less (all models)

Dissipation at rated excitation 100 µW at 273 K 100 µW at 273 K 100 µW at 273 K

Units range (ohms) 0 Ω to 300 Ω0 Ω to 300 Ω0 Ω to 300 Ω

Lead wire configuration (polarity) Platinum, no polarity Platinum, no polarity Platinum, no polarity

Physical Specifications

Materials in the sensor/construction High stability of the PT-100 PRTs is achieved through production techniques that provide nearly strain-free, securely mounted

elements rigidly encapsulated in ceramic or glass. All devices are carefully annealed after assembly (all models).

Size in millimeters 2 mm diameter x 20.3 mm long 1.6 mm diameter x 12 mm long 1.8 mm diameter x 5 mm long

Mass 250 milligrams 120 milligrams 52 milligrams

Leads

Size 0.25 mm diameter x 15 mm long 0.25 mm diameter x 15 mm long 0.25 mm x diameter 10 mm long

Number Two (2) Two (2) Two (2)

Material Platinum Platinum Platinum/Nickel Alloy

Insulation None None None

Internal atmosphere Solid Solid Solid

Environmental

Radiation effects Recommended for use in radiation environments (all models). See Reference Section.

Magnetic fields Because of their relatively low magnetic field dependence above 30 K, platinum sensors are useful as control elements in

magnetic field applications when some error can be tolerated (all models).

Vacuum vs. liquid differences Not applicable Not applicable Not applicable

ESD sensitivity None None None

Noise sensitivity None None None

What is SoftCal?

SoftCal is a 2-point or 3-point

calibration which offers improved

accuracy without the cost of a full

calibration. SoftCal is available for

silicon diodes and platinum sensors.

For detailed information on SoftCal,

CalCurve and Curve 10, see the

Reference Section.

Using a 2-point SoftCal with fixed

temperature points taken at 77 K and

305 K, Lake Shore can generate a

temperature table for a platinum

sensor which is accurate to ±250 mK

from 70 K to 325 K. Using a 3-point

SoftCal with fixed temperature

points taken at 77 K, 305 K, and

480 K, Lake Shore can generate a

temperature table for a platinum

sensor which is accurate to ±250 mK

from 70 K to 480 K.

For information

on Packages for

Sensor Installation,

see pages

1-40 to 1-42.

Adding lead length

to sensors - see

page 1-43.

Lake Shore ☎ (614) 891-2244 Fax: (614) 818-1600 www.lakeshore.com EMail: sales@lakeshore.com

Platinum RTDs

Uncalibrated sensor

Specify the Model number in the left column only,

for example PT-103.

Calibrated sensor

Add Calibration Range Suffix Code to the end of the

Model number, for example PT-103-14L.

Accessories suggested for installation (see Section 3)

Stycast Epoxy CryoCable

Apiezon Grease Manganin Wire

IMI-7031 Varnish Indium Solder

90% Pb, 10% Sn Solder Phosphor-Bronze Wire

Ordering Information

1-30 PT-100 Platinum RTDs

Accessories available for sensors

ECRIT Expanded interpolation table

SCR Special calibration report

8000 Calibration report on floppy disk

COC-SEN Certificate of conformance

Platinum R TD Calibration Range Suffix Codes

Numeric figure is the low end of the calibration.

Letters represent the high end: D = 100 K, L = 325 K, H = 475 K, J = 800 K.

SoftCal™

Model number 2S 3S 14D 14L 14H 14J 70L 70H 70J

PT-102 ✓✓✓✓ ✓✓✓✓ ✓

PT-103 ✓✓✓✓ ✓✓✓✓ ✓

PT-111 ✓✓✓✓ ✓ ✓✓