DESCRIPTION

 The Carbon+Unitrode-1” is designed for cure monitoring of carbon fiber composites like carbon fiber sheet molding compound (CF-SMC) or carbon fiber reinforced prepreg (CFRP) in presses, molds or harsh environments.

 Dielectric sensors normally require filters to block conductive fillers and prevent short circuiting of the electrodes. Filters, however, must be replaced manually after each test and add time, effort and cost, so it is necessary to avoid them in rapid, repetitive operations. For cure monitoring without filters, the electrode of the Carbon+Unitrode-1” has a rugged, insulating coating that allows direct contact with carbon fiber composites.

 The Carbon+Unitrode-1” may be mounted so the electrode is flush with a platen or mold surface, insuring no interference with the flow of material during processing. The high temperature polymer body is protected by a stainless steel sheath with a nominal 1.0” (2.54 cm) diameter. A thermocouple is positioned just below the surface to allow measurement of process temperatures. Dielectric and thermocouple signals are routed through a 10-foot (3 m) long stainless steel conduit to high temperature connectors. Sensor and cabling are rated for operation up to 220 °C and are suitable for R&D, QA/QC and manufacturing applications with repetitive operations.

SPECIFICATIONS

Dimensions (available with side or rear exit conduit):

• Diameter, sensor head : 1.0” (2.54 cm) nominal
• Height, sensor head : 1.0” (2.54 cm) nominal
• Length, conduit : 10’ (3 m) nominal
• Diameter, active face : 0.69” (17.5 mm)
• Diameter, electrode : 0.50” (12.7 mm)

Composition:

• Body : High temperature polymer
• Sheath/conduit : Stainless steel
• Cabling : Teflon insulated

Operational:

• Temperature, maximum : 220 °C (428 °F)
• Frequency, mid-con mode : 0.1 Hz – 100 KHz

Sensor Parameters:

• A/D ratio : 3 to 8 cm (depending on sample thickness)
• Base capacitance : ~20 pF – 25 pF (actual value may vary)

Thermocouple : Type J standard, Type K avail. upon request