epak ELECTRONICS LTD.

MILLFIELD ESTATE, CHARD, SOMERSET. TA20 2BB. TEL : 01460 61791 FAX : 01460 67833

NEW from Epak Electronics is the range of high quality thermistors from Sensor Scientific Inc. We are offering full engineering applications support on SSI's entire product range of thermistors, RTD's and custom probe assemblies.

The range of thermistors covers :-

SSI Thermistors & Sensors CD-ROM Available.

Wafer Thermistors

Sensor Scientific wafer thermistors are ideally suited for applications requiring a high-precision temperature sensor, without the high cost. Standard units are available with resistance values from 100 to 100k ohms @ 25°C. Values outside this range are available through special order. A variety of custom options are available, including ready to use temperature probe assemblies. Design assistance is available.

Features:

Interchangeable Tolerance Wafer Thermistor

· Best choice for applications requiring high accuracy or interchangeability over a wide temperature range.

· Very High Stability

· Industry standard resistance vs Temperature curves

Standard Tolerance Wafer Thermistor

· Best Choice for applications requiring high accuracy at a single temperature (standard calibration temperature is 25°C: Other temperatures are available)

· High Stability

· Cost Effective

Options

· Customised lead and terminations

· Non-Standard resistance tolerances

· Non-Standard interchangeability and operating range

· Non-Standard resistanve vs Temperature curves

SP Series Glass Probe Thermistors

Sensor Scientific glass probe thermistors are ideal for applications requiring high stability and ruggedness. Typical applications include fluid flow, level measurement, temperature measurement and temperature compensation.

· Superior Stability

· Robust Glass Seal Construction

· Non-Standard Glass and Lead Lengths, Resistance values, value added assemblies are available.

S14 Series Small Bead Thermistors

Sensor Scientific small bead thermistors are typically used in applications that require a sensor with low thermal mass coupled with a

small physical size. Typical applications include bio-medical assemblies, fluid flow, fluid level measurement, hot wire anemometry, and

small surface area measurement.

· Superior Stability

· Very Fast Response Time

· Low Thermal Mass

· Non-Standard Glass and Lead Lengths, Resistance values, value added assemblies are available.

Glass Encapsulated Thermistors

The SD series of glass encapsulated thermistors offer tighter tolerances and low costs associated with wafer thermistors, with reliability and high temperature capabilities normally associated with glass probe thermistors. The rugged DO-35 diode style package is resistant to environmental stress. Tape and reel packaging is available for auto-insertion applications.

Specifications:

· Thermal Time Constants: 5 secs (still air)

· 0.5 sec (stirred oil)

· Dissipation Constant: 2mW/°C

· Maximum Operating Temperature: 300°C

Features:

· High Stability

· Low Cost

· High Temperature Capability

· Hermetically Sealed DO-35 Package

Options:

· Non-Standard Resistance Values

· Non-Standard Tolerances

· Tape & Reel Packaging

· Value Added Custom Probe Assemblies

Surface Mount Chip Thermistors 0805 Package

Applications:

· Rechargeable Battery Packs

· Medical Electronics

· Automotive Electronics

· Crystal Oscillators

· Temperature Measurement

· Temperature Compensation

Features:

· EIA Size 0805

· Surface-Mountable via Die Bond or Reflow Soldering Process

· Tough Plastic Package Survives Rough Handling

· Available on Tape and Reel

· Leach-Proof Electrodes

· New Innovative Design (US/Int Patent Pending)

· Standard Resistance Tolerances of ±5%, 10% & 15% @25°C

Electrical & Thermal Characteristics:

Dissipation Constant

Alumina Substrate, 0.64mm thick 7.1 mW/°C

Flex Polymide circuit 0.11mW/°C

Beta Tolerance +/- 200K

Operating Temperature Range -50 to +125°C

Options:

Non-Standard Resistance

Tolerances, and

Resistance Values

Custom Temperature Probe Assemblies

Sensor Scientific Temperature Probe Assemblies offer a specific Solution for a specific application. The designs depicted below are just a small sample of the many options available. If a standard configuration is not practical, our application engineers will assist you in designing the probe best suited to your specific application. Most of the designs depicted below are available with wafer (W type), glass encapsulated (SD type), or glass probe (SP type), NTC thermistors, and Platinum (P type) RTD elements. Call Epak Application engineers for further details.

STD 10 High Temp Probe

STD 11 Shrink Tubing Therm/Assembly

STD 12 Disposable Patient Temp/ probe

STD 13 Patient Skin Probe

STD 14 Disposable Skin Temp

STD 15 Wallmount Surface Sensor

STD 16 Duct Sensor

STD 17 Surface Mount Duct Sensor

STD 18 Immersion Sensor

 

Thermistor Maximum Operating Temperature:

W type 150°C (for best stability interchangeable wafer thermistors, the operating temperature should be limited to 70°C maximum)

S, SP & SD type 200°C

P type Platinum RTD elements 400°C

 

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