Pressure Sensor: Zero-reset Function Does Not Work

The zero-reset function of E8F2 Pressure Sensor does not work. What's causing this and what can be done to resolve it?

Cause: You may be using the E8F2 outside the measurement range.

Countermeasure: Use the E8F2 within the measurement range.

Pressure Sensor: Linear Accuracy

What is linear accuracy of Pressure Sensors?

Linear accuracy, expressed as a percentage of full scale, is the amount of deviation from the rated values for output current (4 mA and 20 mA) or voltage (1 V and 5 V) when zero pressure and the rated pressure are applied at a constant temperature of 23°C.

Example: The accuracy for E8M-10 Pressure Sensor is ±5% FS.

Converting this into voltage,

±5% × 1⁄1000 (%) × 4 V (FS) = ±0.2 V,

so the line will deviate ±0.2 V max.

Pressure Sensor: Negative Pressure Applied to Positive Pressure Sensor

If a negative pressure is applied to a positive pressure sensor, may the sensor fail to operate properly?

If an absolute value of pressure is above a withstanding pressure,the sensor may be damaged.

For example, when using the Digital Pressure Sensor "E8F2-A01C" a withstanding pressure is 400kPa. This means that as long as a pressure in a range from -400 to 400kPa is applied within 30 seconds, the sensor is not damaged

Pressure Sensor: Positive and Negative Gauge Pressure

What is positive and negative gauge pressure?

Gauge pressure is the amount of pressure expressed in terms of atmospheric pressure. It is referred to as "positive pressure" when it is greater than one atmosphere, and "negative pressure" when it is less than one atmosphere.

Pressure Sensor: Atmospheric Pressure

What is atmospheric pressure?

Atmospheric pressure is the pressure of the atmosphere. Standard Atmospheric pressure (1 atm) is equivalent to a pressure of 760 mm-Hg expressed by a height of 760 mm on a mercury barometer.

Pressure Sensor: Relationship between Pressure and Output Voltage for Negative-pressure Models

For negative-pressure models, what is the relationship between pressure and output voltage?

The relationship is given in the following graph.

Pressure Sensor: Measure Liquid Pressure

Are the Pressure Sensors which can measure the pressure of liquids available?

Yes. The Pressure Sensor "E8AA Series" can measure it.

However, the flow rate cannot be measured.

Pressure Sensor: Absolute Vacuum

What is an absolute vacuum of Pressure Sensors?

An absolute vacuum is a space with a complete absence of air or any objects. It is a condition in which pressure is infinitely low.

Pressure Sensor: Measure Pressure Difference

Are Pressure Sensors available that can measure pressure difference?

Yes, E8M-A1 Pressure Sensors and E8Y series can measure pressure difference.

Example: Connect the larger absolute value to the positive (+) port.

Using the E8M-A1

Difference between pressure values -55 Pa and -20 Pa

Negative (-) port: -20 Pa

Positive (+) port: -55 Pa

Difference between pressure values 10 Pa and 25 Pa

Negative (-) port: 10 Pa

Positive (+) port: 25 Pa

The reference port is the negative (-) port. Use the port as the negative (-) port when it is left open to atmospheric pressure.

Pressure Sensor: Relationship among Units of Pressure

What is the relationship among units of pressure?

The relationships are given in the following table.

Pressure Sensor without Piping

Piping is a lot of trouble. What Pressure Sensors do not require piping?

The E8MS/E8M Series Pressure Sensors does not require piping. Because piping is not required, measurement errors and response delays are eliminated, which improves measurement accuracy.

Pressure Sensor: Control Multiple Pressures from a Location

Are products which can control multiple pressures from a single location available?

The Pressure Sensor "E8MS/E8M Series" can display the pressure indications for four pressure sensors (four pressure generating locations) on a single panel and therefore the pressures for four sensors can be controlled from a single location.

Pressure Sensor: Manual Pressure Setting Procedure

What is the procedure for setting the pressure of E8F2 Pressure Sensor manually?

Pressure Sensor: Pressure Autotuning Setting Procedure

What is the procedure for setting autotuning for E8F2 Pressure Sensor?

Pressure Sensor: Withstand Pressure

What is the withstand pressure of Pressure Sensors?

Withstand pressure is the pressure that can be withstood for up to 30 s if the rated pressure range is exceeded. For example, the Withstand pressure for E8F2-A01C Pressure Sensor is 400 kPa.

Pressure Sensor: Indicator and Operation Key Functions for E8F2

What are the functions of the individual indicators and operation keys on E8F2 Pressure Sensor?

Indicates the degree of measured pressure in relation to the set pressure.

1. Bar Indicator (Green)
   Indicates the degree of measured pressure in relation to the set pressure.
2. Numeric and Menu Display (Red)
   Indicates measurement values and setting menu items.
3. Unit indicator (Green)
   Indicates the unit used for detection. The unit indicated on the indicator is the one currently set.
4. OUT1 Indicator (Orange)
   Lit when OUT1 is turned ON.
5. OUT2 Indicator (Orange)
   Lit when OUT2 is turned ON.
6. Up Key
7. Down Key
   • Used to select or change the set items, set contents, and set values in setting mode.
   • Press either key to check the ON and OFF points in measurement mode. The values are reset by pressing both keys simultaneously.
   • Use together with the SET Key for setting the Sensor to a special setting mode or energy-saving mode.

1. SET Key
   • Used for entering the set contents and set values in setting mode.
   • Used for setting the Sensor to basic setting mode or pressure setting mode.

Pressure Sensor: Hysteresis

What is hysteresis (for ON/OFF outputs)?

Hysteresis is the difference between the ON-point pressure and OFF-point pressure for output expressed as a percentage of the pressure full scale.

For example, assuming the rated pressure of the E8F2-A01C is 100 kPa (because the pressure range is 0 to 100 kPa),

the ON point is 80 kPa, and

the OFF is 50 kPa,

the hysteresis = 30% according to the following formula.

Pressure Sensor: Linear Hysteresis

What is linear hysteresis?

An ideal line is drawn along the output current (or voltage) values for zero pressure and rated pressure to find the amount of error between the actual measured current (or voltage) and the ideal current (or voltage). The linear hysteresis is the maximum absolute value of the difference between the values obtained for pressure rising error and pressure falling error expressed as a percentage of full scale.

For example, assuming the rated pressure of the E8F2-A01C is 100 kPa (because the pressure range is 0 to 100 kPa),

the ON point is 80 kPa, and

the OFF is 50 kPa,

the hysteresis = 30% according to the following formula.

Pressure Sensor: E8Y Pressure Indicator

How is pressure indicated for E8Y Pressure Sensors?

The indication method slightly differs between E8Y-A1 and E8Y-A2/A5.

Indicated as 000 Pa to 999 Pa below 1 kPa and, but changes to 1.00-kPa display above 1 kPa.

Indicated as 0.00 kPa to 2.00 kPa or 5.00 kPa whether above or below 1 kPa. Indication is not given in units of 1 Pa.