HS Code for Manostats

Manostats are classified under HS code 9032.20, which covers automatic regulating or controlling instruments and apparatus. The classification is based on the functional nature of the device. A manostat is designed to maintain a constant pressure in a system by automatically triggering a corrective action when the pressure deviates from a set point. This distinguishes it from a simple pressure gauge. Under the General Rules of Interpretation (GRI), specifically GRI 1, the device is classified in Chapter 90 because it is a precision instrument used for checking or controlling variables. Heading 9032 is reserved for instruments that consist of a measuring device, a control mechanism, and a starting, stopping, or operating device. Since a manostat performs all these functions to regulate pressure, it is specifically assigned to the subheading 9032.20.

Products Included

• Automatic pressure regulators (manostats)
• Vacuum manostats for laboratory environments
• Industrial pressure controllers with automatic feedback loops
• Electronic manostats used in HVAC systems

Common Misclassification

Manostats are often confused with HS code 9026.20, which covers instruments for measuring or checking pressure. The key difference is that 9026 instruments only measure or display pressure, whereas 9032 instruments (manostats) actually control it. Another common misclassification is HS code 8481.10, which covers pressure-reducing valves. While both regulate pressure, 8481.10 is for mechanical valves, whereas 9032.20 is for the complete automatic controlling apparatus that may include electrical or electronic components to maintain a set point.

FAQ

What is the HS code for Manostats?

The HS code for automatic manostats is 9032.20.

Is a manual pressure valve considered a manostat?

No, manual valves are classified under heading 8481. A manostat must be an automatic controlling instrument to fall under 9032.20.