Manufacture: Azbil Corporation
Model: HPQ-T1, HPQ-T2

Detecting the upper and lower limits of the liquid level in a tank

• This switch incorporates an amplifier and can be attached to the sight tubes and level gauge pipes of semiconductor and FPD manufacturing equipment, etc., to detect liquid level
• Refraction-based detection ensures sufficient gain between light-ON and dark-ON light levels
• A detection method that is suitable for liquids with poor transmittance (photoresist liquid, waste fluids, etc.) and that minimizes malfunctions due to bubbles, water droplets, etc.

Summary

Features

• Fits various pipe diameters
  Can be attached to a pipe with outer diameters of 8 to 13 mm (thickness: 1 mm).
  PFA pipes are recommended. For pipes made of other materials, please contact us.
• Repetitive detection of liquid level with high accuracy
  A 1 mm-wide slit is provided for the optical axis, achieving a high repetitive detection accuracy of ±0.5 mm.
• Easy operation check and adjustment of gang-mounted switches
  The operation panel located on the side improves usability and facilitates operation checks.
  The operation mode can be changed using the Light-ON/Dark-On switch. By also using the operation indicator, the I/O can be checked.
• PNP output is available.
  PNP output, which is often required for equipment to be exported, is also available as a standard feature.

Detection principle

Lineup

Model	Features
HPQ-T1	Applicable pipe diameter: 8–13 mm, NPN output
HPQ-T1-002	Applicable pipe diameter: 8–13 mm, NPN output, Light-ON, adjustable sensitivity
HPQ-T1-003	Applicable pipe diameter: 8–13 mm, NPN output, Dark-ON, adjustable sensitivity
HPQ-T1-004	Applicable pipe diameter: 3–7 mm, NPN output
HPQ-T2	Applicable pipe diameter: 8–13 mm, PNP output
HPQ-T2-005	Applicable pipe diameter: 3–7 mm, PNP output