Pressure sensors and Liquid leak sensors FAQ

Pressure sensors and Leakage sensors FAQ

  • Chapter 1
  • About Products (2)  

Q16. Liquid leak sensors WL10 reusability

A WL10 detected a water leak. Can it be reused if the water is wiped off from its detection face?
Yes, it can. Wipe off the water droplets completely with a dry cloth. Failure to comply may result in a malfunction. The WL10 operates according to the following principle: its internal light-emitting device (LED) emits light, which is totally reflected by its internal prism and then received and converted by its internal photodiode (PD) into an electric current. When the prism comes into contact with a liquid, the LED light is transmitted and diffused in the direction of the liquid, resulting in a significant decrease in the amount of light reaching the PD. The WL10 uses this property of light to detect liquid leakage.
Fig.) WL10 leakage detection principle

Q17. Product lineup in accordance with UL991

We are considering using a pressure sensor for a semiconductor manufacturing machine. Are UL991-compliant ones available from you?
Yes. Our product lineup includes PAS91, an absolute pressure sensor featuring both an analog output and a switch output, and PG-20, a pressure gauge installable into integrated gas units.
Absolute pressure switch PAS91 series
Pressure gauge PG-20 series
  • Absolute pressure switch PAS91 series
  • Pressure gauge PG-20 series

Q18. How to solve E2 ERRORs in pressure gauges

We restarted a PG-75 for the first time after long-term non-use. Its zero adjustment resulted in an "E2 Error" message. How should this be dealt with?
The "E2 Error" message occurs as a result of zero adjustment performed with a residual pressure exceeding ±10%. To undo the error, press the M key. After venting the pressure to atmosphere, perform zero adjustment again.

Q19. Effects of the use of not specified power supplies

According to its specifications, the P-3000S is driven with a standard constant current of 1.5 mA. Is there any problem when it is driven with a constant voltage of 5 V? Besides, what will become of the accuracy of linearity and that of the temperature characteristics when a 1-mA current is set for a constant current drive?
The P-3000S is a high-precision pressure sensor with a built-in temperature compensation circuit. Temperature compensation is driven by a power supply with a constant current of 1.5 mA to optimize the temperature within a range of 0°C to 50°C. The driving power supply can still work with a constant voltage of 5 V, which, however, results in poor temperature characteristics. With a constant current of 1 mA, the output voltage will decrease, resulting in poor temperature characteristics.

Q20. How to solve Zero Point ERRORs in pressure gauges

The PG-100 handy manometer we use reads "-00.3" at power-on. The normal reading should be either "00.0" or "00.1." Is our PG-100 out of order?
    The zero reading of the PG-100 may shift depending on external factors, such as a change in the ambient temperature. The PG-100 has a zero adjustment trimmer at its top. Adjust the trimmer with a precision screwdriver.

Q21. Batteries replacement notice of Manometers

Is it normal that the reading by the PG-100 manometer appears thin when its battery is running low? Does a dying battery result in a reading lower than the actual pressure? Is there any method we can check with as the reference for the time to replace the battery?
When the battery is running low, "LOBAT" appears in the upper left part of the LCD to prompt the user to replace the battery.

Q22. About elements and materials of pressure sensors

We have adopted the PG-35 pressure gauge as the atmospheric pressure detector for the vacuum equipment we manufacture. The specifications for the equipment of an end-user who has placed an inquiry for our vacuum equipment require that the atmospheric pressure sensor to be used shall be a semiconductor sensor with a diaphragm made of stainless steel. Does the PG-35 meet this requirement?
The liquid contact part of the PG-35 is made of SUS 316L stainless steel and meets the requirement. Note, however, that the sensor module of the PG-35 is a dual-diaphragm pressure transducer with sealed-in silicone oil. Use under high vacuum may cause the air entrapped in the silicone oil to bubble, resulting in a shift in the zero voltage. For use under a pressure of 1.3 kPa abs or lower, we recommend the PG-35L, a silicone oil-free, thin-film element pressure gauge. Click here to download the brochure for the PG-35L.
  • A. Double diaphragm(Oil-enclosured) type
    Series namePressure lower limit
    P-8300, P-8305, P-8505, PA-750, PA-758, PA-800, PA-830, PA-838, PA-838-D, PA-840, PA-848, PA-850, PA-858, PS8,  PS83, PS85, PG-35,PG-75, PG-208, PG-100B 1.3 kPa abs.
  • B. Thin film type(High vacuum compatible)
    Series namePressure lower limit
    PA-920S, PA-928S, PA-930, PA-930-A, PS91, PG-20, PG-35L 1.4 × 10-4 kPa abs.

    Go to the detailed information page of pressure gauge pg-35l seriesMore information about pressure gauge pg-35l series,click here.

Q23. Manometers selection for organic solvent medium

We want to use a PG-100-102A at hand to measure a fluid containing a diluted organic solvent. Is this possible?
The medium for use with the PG-100-102A is a noncorrosive gas (moisture-free air or inert gas). For users intending to measure the pressure of a fluid containing an organic solvent, we recommend the PG-100B-102A with a pressure receiver made of SUS 316L stainless steel.

Q24. Use at high altitudes / Kind of pressure references

We are considering using a PS6-102G-NAR in a location at an altitude of 1,000 [m]. Can it be used in this way?
Yes, it can. The PS6-102R-NAR pressure switch reads gauge pressure using atmospheric pressure as its reference pressure (0 kPa), and its altitude standard at the height of 1,000 m is atmospheric pressure.
Pressure indication method

Q25. Out of Production

What is the discontinuation information for the pressure sensor?
Information on discontinued products and alternative products is posted on the company's HP product information page.

page top