# Pressure Transducers

Pressure transducers convert liquid or gas pressures into electric quantities. According to measuring purposes, they are connected to various instruments for monitoring, recording and controlling pressures.
They have highly precise dedicated self-temperaturecompensated strain gages incorporated as pressure detecting elements and feature a hermetically-sealed structure with inert gas filled in, ensuring superior linearity, thermal characteristics and waterproofness. Thus, they enable highly precise and stable pressure measurement for a long period of time in a wide range of fields including chemical, machinery and steelmaking.

Important Notice
Unless specified, strain-gage transducers must not be used under hydrogen environment.

## Features

• Long-term stable operation
• Highly precise
• Excellent thermal characteristics

## Types of Pressure

### Absolute Pressure

Absolute pressure is a pressure expressed by referring to vacuum (complete) pressure as zero. It is mainly used in physical science for expressing atmospheric pressure, etc. Absolute pressure is calculated by following formula : absolute pressure = atmospheric pressure + gage pressure. KYOWA mentions absolute pressure as “abs.” to differenciate absolute pressures to gage pressures.

### Gage Pressure

Gage pressure is a pressure expressed by referring to atmospheric or ambient pressure as zero. Industrially, it is merely called pressure unless otherwise noted. Pressure higher than atmospheric or ambient pressure is called positive gage pressure and pressure lower than atmospheric or ambient pressure, negative gage pressure. Though ISO recommends to affix "Pe" or "Gage" to gage pressure, KYOWA does not affix either of them to gage pressure.

### Differential Pressure

Differential pressure is a difference between a specific pressure and other. Thus, it may be either positive or negative.

### Relations between Pressure Units

Pa bar kgf/cm2 atm mmH2O（mmAq）
1 1×10-5 1.01972×10-5 9.86923×10-6 1.01972×10-1
1×105 1 1.01972 9.86923×10-1 1.01972×104
9.80665×104 9.80665×10-1 1 9.67841×10-1 1×104
1.01325×105 1.01325 1.03323 1 1.03323×104
9.80665 9.80665×10-5 1×10-4 9.67841×10-5 1

1Pa=1N/m2
1Torr=1mmHg=1.33322×102Pa=1.33322×10-3bar=1.35951×10-3kgf/cm2
=1.31579×10-3atm=1.35951×10mmH2O(mmAq)
1psi=6894.7Pa=7.0307×10-2kgf/cｍ2