Temperature compensatible pressure monitor and sensor construction

A sensor for monitoring the pressure level of a desired pressure source and providing a signal whenever the pressure source level differs from a pre-set level even when exposed to extreme temperature conditions, said sensor comprising:

• A. a housing having at least one pressure receiving inlet for connection to the pressure source being monitored;
• B. switch means
• a. mounted in the housing, and
• b. adapted to provide an output signal when activated for indicating a pressure level change outside of the pre-set parameters;
• and
• C. a temperature compensating pressure level monitoring-actuator assembly incorporating
• a. an elongated actuating rod
• (1) mounted for axial movability in response to changes in the level of the source pressure,
• (2) connected at one end to the switch means for activation thereof whenever the source pressure differs from the pre-set level, and
• (3) formed from temperature insensitive material, whereby changes in the ambient temperature has negligible effect on the expansion or contraction of said rod, and
• b. movement control means
• (1) connected to the actuating rod, and
• (2) providing an adjustable biasing force to said rod for controllably setting the forces required to move the elongated rod from its first monitoring position to its second alarm-activating position;
• whereby an effective precision temperature insensitive sensor is attained which continuously monitors a pressure source within limited pre-set ranges and provides an output indication whenever the source pressure deviates from the pre-set level regardless of temperature conditions to which the sensor is exposed.