Specialized manufacturer of Digital Pressure Meters and Load Cells


Pressure Sensor

About Sensor Installation

  1. What should be done to eliminate the influence of noise?
    • First of all, install the sensor as far from the noise source as possible.
    • If doing so does not work, connect the ground to the frame on which the sensor is installed.
    • If the influence of noise is still suspected nonetheless, it is recommended to use a commercial noise filter.
  2. What should be done to prevent condensation?
    • First, dehumidify the room with air-conditioner.
    • If the sensor is directly installed on a cooling pipe, provide a connection pipe to set the sensor apart from the cooling pipe by more than 30 cm, so that the difference between the sensor temperature and ambient temperature may be within 5°C.
  3. Can you tell me the working temperature?
    • Please confirm the compensated temperature range and safe temperature range shown in the product specifications on this site. The former shows the range where the accuracy of the product is guaranteed, and the latter is the range where the product can be used without failure.
    • When using the sensor in low temperature, make sure the location where the sensor is used will not be frozen.

About Products

  1. What does "oil-free processing" mean?
    • It refers to the processing for cleaning the pressure port so that no oil and water from adhering to or remaining in the surface of the pressure port.
  2. Is it possible to make sensors for the range other than those shown in the website?
    • Yes, it is.
      However, some restrictions on the accuracy or temperature characteristics may apply. Contact our Sales Department in advance.
  3. Can chemical or gases that cause corrosion be measured?
    • Basically, stainless steel materials such as SUS316L or SUS630 are used in the connecting parts of pressure ports of VALCOM sensors. Measurement is possible as long as your media to be measured do not corrode these materials.
  4. What is the difference between the gauge pressure (atmospheric pressure) and absolute pressure?
    • Basically, gauge pressure (atmospheric pressure) is based on the pressure of the atmosphere where the sensor is placed as zero (reference), and absolute pressure is measured from absolute zero, the pressure in a vacuum (approx. 10 Pa or below).
  5. What should be done to protect against excessive pressure or pressure surge?
    • If a pressure surge occurs, the peak value may be five times the normal pressure. In such a case, it is recommended to provide an orifice or other fitting to reduce the pulsation pressure.(Refer to the Options page.)
  6. What is water hammer phenomenon?
    • If flow rate is changed abruptly by using a valve, a severe and transient pressure fluctuation may occur, thus causing a hammering noise. This is called water hammer phenomenon. If water hammer occurs, excessive pressure will be exerted on the pressure port of the sensor, which may lead to failure.

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