Pressure detection device and pressure detection system

A pressure detection system comprising:

• a detection device including:
• a detection element that detects a change in pressure;
• a processing circuit that applies electrical processing to a detection signal outputted by the detection element;
• an electrical conduction member that has conductivity and is disposed to cover at least a part of the processing circuit, and is connected to a ground of the processing circuit;
• and a housing that houses the detection element, the processing circuit and the electrical conduction member, the housing being electrically insulated from the detection element, the processing circuit and the electrical conduction member, and mounted to a grounded conductor in a state of being in contact with the conductor;
• and
• a supplying and processing device that is connected to the detection device via a supply line for supplying power-supply voltage to the processing circuit, a transmission line for transmitting an output signal outputted from the processing circuit and a ground line to be connected to the electrical conduction member or the ground of the processing circuit, and is connected to the conductor by a system different from a system via the ground line, to supply the power-supply voltage to the detection device and to apply processing to the output signal inputted from the detection device.

A pressure detection system comprising:

• a detection device including:
• a detection element that detects a change in pressure;
• a processing circuit that applies electrical processing to a detection signal outputted by the detection element;
• a first housing that has conductivity and is disposed to cover at least a part of the processing circuit, and is connected to a ground of the processing circuit;
• a second housing that has conductivity and houses the first housing, and is mounted in a state of being in contact with a grounded conductor;
• and an insulating member that has an insulating property and is disposed between the first housing and the second housing to electrically insulate the first housing and the second housing;
• and
• a supplying and processing device that is connected to the detection device via a supply line for supplying power-supply voltage to the processing circuit, a transmission line for transmitting an output signal outputted from the processing circuit and a ground line to be connected to the first housing or the ground of the processing circuit, and is connected to the conductor by a system different from a system via the ground line, to supply the power-supply voltage to the detection device and to apply processing to the output signal inputted from the detection device.