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Philtec, Inc.

Philtec, Inc.

PHILTEC: Custom Fiberoptic Sensors for Non-contact Measurement of Linear Distance, Displacement and Vibration

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Extreme Temperatures

You are here: Home / Industry/Applications / Extreme Temperatures

Philtec sensors can be designed for use in extreme high or low temperatures.

Temperature Limits [App Note 71 PDF]

Standard Glass Fiber Sensor Tips

Standard sensor tips are constructed with glass fibers, epoxy and stainless steel housings. These standard materials allow operation down to cryogenic temperatures approaching absolute zero. The upper temperature limits are:

Application Notes For Extreme Temperatures

Cryogenics: Cryogenic Imaging System

Cryogenic Turbo Pump

200°C continuous
300°C intermittent
Standard, most models
250°C continuous
300°C intermittent
High Temperature Cure, specify Option T8
350°C continuous
400°C intermittent
High Temperature Construction, Specify Option T9

Fused-End Quartz Fiber

800°C continuous (End Face Only)

Fiberoptic Cables

Glass and Quartz fibers have a buffer coating that keeps the fibers flexible. That coating burns off starting at 300°C and the fibers will become brittle and easily cracked. The sheathing materials limit the temperature range of the cables as given in the table below. In the most extreme conditions, the glass fibers can be exposed to cryogenic temperatures near absolute zero and elevated temperatures above 300°C (up to 480°C). Fibers exposed to temperatures above 300°C will become very brittle, and therefore, they should not be flexed during or after such exposure. Fibers can be slowly exposed to cryogenic temperatures and returned to room temperature (avoiding thermal shock) without suffering embrittlement. The temperature limits of the various cable jackets are as follows:

ModelMaterialsTemperature RangeFeatures
nonePVC over Steel Monocoil+10 to +105 CGood general purpose, moderate crush resistance, moderate tensile strength.
C1Interlocking Stainless Steel-150 to +450 CHigh strength & temperature range, good flexibility.
C2Silicone-Fiberglass over
Steel Monocoil
-75 to +232 CFlexible and durable, moderate crush resistance, good tensile strength, radiation resistant.
C3Silicone-Fiberglass-75 to +232 CVery flexible and durable, light crush resistance, good tensile strength, excellent flex life and resistance to fatigue, radiation resistant.
C5PVC over Interlocking
Stainless Steel
+10 to +105 CExcellent pliability, does not stretch, resists lateral pressure, twisting & pulling, withstands repeated bending.
C6Convoluted PTFE-150 to +260 CGood for vacuum applications, moderate crush resistance, very flexible, MRI compatible. Opaque PTFE is available in limited sizes.
C7PTFE-150 to +260 CLiquid tight vapor barrier protection, very poor flexibility. Vacuum & MRI compatible.
C8PVC+10 to +107 CSmall lightweight, very flexible, liquid tight, MRI compatible, no crush resistance.
C9Annealed SS Tubing-150 to +450 CSemi-rigid, liquid tight, crush proof. Good for high temperature, high pressure, high vibration environments
C11Polyolefin Shrink Tubing-55 to +300 CSemi-Flexible, liquid tight, thin wall vapor barrier, not crush resistant. MRI and vacuum compatible, radiation resistant.
C12Polyolefin Over SS Interlok-55 to +300 CCrush proof, semi-flexible, liquid tight, thin wall vapor barrier, vacuum compatible.
C13Furcation Tubing+10 to +85 CPVC over Kevlar over Polypropylene fibers prevent stretching. Good for small fiber sensors, D20 or RC20 and smaller. MRI compatible and liquid tight. Light crush resistance but not kink resistant.
C14MiscellaneousCustomer choice for special application.

Electronics

Analog Output Amplifiers – 0°C to 70°C
DMS Amplifiers with LCD – 0°C to 50°C
DMS Electronics without LCD – 0°C to 70°C

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PHILTEC, Inc. | Annapolis, Maryland U.S.A. | tel: 410-757-4404 | fax: 410-757-8138 | e-mail: sensors@philtec.com