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Application Notes for Extreme Temperatures
High Temp Fiberoptics: For Exposure To 482°C
Cryogenics: Cryogenic Imaging System
Extreme Temperatures
Philtec sensors can be designed for use in extreme high or low temperatures.
Temperature Limits [Datasheet 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:
| 200°C continuous 350°C intermittent 1-2 hrs |
Standard, most models |
| 260°C | Models RC12, RC140, RC190 |
| 350°C continuous | High Temperature Cure, specify Option T8 |
| 482°C continuous | High Temperature Construction, Specify Option T9 |
Fiberoptic Cables
The sensor cables are comprised of glass fiberoptics with a protective sheathing. 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 abslolute zero and elevated temperatures above 300°C (up to 482°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 protective sheathing layers are as follows:
| Standard | PVC over steel monocoil. Good general purpose sheathing. | +10 to +107°C |
| C1 | Stainless steel interlocking hose. Provides maximum strength. | -150° to +340°C |
| C2 | Silicone rubber. maximum flexibility, no crush resistance. |
-62 to +260°C |
| C3 | Silicone over PTFE spiral wrap. Non-metallic light crush resistance, for short lengths only, 2 meters maximum. |
-62 to +260°C |
| C4 | Silicone over steel monocoil. moderate crush resistance. | -62 to +260°C |
| C5 | PTFE over SS Interlok. Provides vapor barrier protection, maximum strength, wide temperature range. Has poor flexibility. |
-150 to +260°C |
| C6 | PVC low temperature shrinkwrap over Polyethylene Wrap. Non-metallic with light crush resistance, good for long lengths. |
+10 to +107°C |
| C7 | Translucent PTFE. For high vacuum applications. Does not outgas. Wide temperature range, poor flexibility, susceptible to light interference. |
-150 to +260°C |
| C8 | PVC Only. Good flexibility, no crush resistance. | +10 to +107°C |
| C9 | Annealed stainless steel tubing (semi-rigid), provides vapor barrier protection, maximum strength, widest temperature range. Has very poor flexibility. |
-150 to +34°C |
| C10 | Silicone over SS Interlok. Good strength sealed sheathing, wide temperature range, good flexibility. |
-62 to +260°C |
| C11 | Polyolefin Heat Shrink Tubing, moderate flexibility, poor crush resistance, good vapor barrier, tough thin-wall material |
-55 to +150°C |
Quartz Fiber Optic Cables and Sensor Tips
Quartz fibers are required for use in applications where the temperatures exceed the limitations of glass fibers, and also in radiation environments. Probes made using quartz fibers can operate up to 800°C. Quartz probes will cost much more than probes made using glass fibers. Please contact the factory for further information.
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