Silicon Diaphragm (only for gases) |
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Principle |
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A strain sensitive resistor (strain gauge) layer is formed on a silicon chip.
When pressure is applied in the direction of the arrow, the silicon chip is
affected and the resistance value of the strain sensitive resistor (strain gauge)
changes. A change in pressure is thereby converted into an electrical signal.
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Structure |
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| Silicon diaphragm AP-30 Series |
Mechanical (Bourdon tube type, etc.) |
 |
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| Pressure is applied directly to the
silicon diaphragm through the
pressure port. |
Pressure applied to the inside
of the Bourdon tube expands
or contracts the entire tube,
and moves the indicator. |
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Features |
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| Pressure sensors fit into two basic categories: electronic
and mechanical. Previously, mechanical sensors like the
Bourdon tube were used. However, since they have a short
service life, electronic pressure sensors that feature long
service life, high accuracy, and high-speed response have
become more desirable. |
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| |
Electronic type AP-30 Series |
Mechanical type |
| Display |
7-segment LED display (3 digits) |
Pointer |
| Output |
Open-collector output |
Contact output |
| Service life |
100 million operations
or more |
10 million operations
or more |
| Responsibility |
5 ms |
150 ms (typical) |
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|
Stainless Diaphragm (Available for both gas and liquid) |
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Principle |
|
| Vapor-deposited distortion resistance on the stainless
diaphragm converts the change in pressure into an
electrical signal. |
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Structure |
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| Single diaphragm
AP-V80W Series |
Double diaphragm method |
 |
 |
| Thin film semiconductor
resistance integrated into the
stainless diaphragm directly
detects the pressure. |
The double diaphragm method
transfers pressure applied onto
the thin stainless diaphragm to
the sensor via silicon oil. |
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Features |
|
| There are two types of stainless steel diaphragms: single
and double. The double diaphragm is commonly used.
However, its thin membrane and temperature sensitive
silicon oil has led to durability and reliability problems. The
single diaphragm has a simple structure that has resolved
the problems mentioned on the left. |
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