Abstract: An apparatus and method for calibrating the pressure readings obtained by catheter tip pressure transducers. The apparatus includes a Plexiglas vessel covered by a closure containing eight catheter ports through which the transducers are introduced into the vessel. The vessel is filled with saline solution that has been warmed to body temperature. The transducer ends of the catheters are inserted through airtight hemostatic control valves into the vessel through the catheter ports. Plexiglas guide tubes are used to guide the transducers into the saline solution at predetermined distances below the surface of the saline solution. The distances are used to calculate the hydrostatic pressures exerted upon the transducers by the saline solution. Known pressures are applied to the transducers through an airtight pressure port in the closure. Calculated hydrostatic pressures are added to the known pressures to provide calibration pressures for comparison with monitored pressure readings.

Abstract: The present invention relates to injection mold hot runner control devices and more particularly to an injection molding control device which eliminates the conventional control cables to improve the quality of feedback signals received by the controller and the safety of the environment in which such systems are used. The present invention utilizes a signal processor to convert analog signals received from the mold temperature sensors into a digital feedback signal in the vicinity of the mold and to transmit such feedback signal to a receiver connected to a controller at a location remote from the mold. The mold controller processes the feedback signal and generates a corresponding control signal. The control signal is transmitted from the remotely located controller to the controlled device, typically the mold heaters.