What is the general threshold for pressure switch action?

Here is the professional English translation of the pressure switch action threshold settings:

?? I. Typical Application Scenarios & Threshold References

Fire Protection Systems?

Standard Type?: Activation range ?0.035–0.05MPa? (pump start pressure)

Preaction Systems?: Lower sensitivity range ?0.03–0.05MPa?

Rail Transportation?

Train braking system trigger point: ?3.8 Bar? (≈ ?0.38MPa?), cuts off traction enable when line pressure drops below this value.

Industrial Equipment?

Reference Point?: Typically ?0.5MPa? (calibrated at standard atmospheric pressure)

Action Threshold?: Common setting ?0.8MPa? (adjusted via precision wrench)

Hysteresis Range?: Maintain ?0.05–0.2MPa? (too small causes frequent cycling; too large reduces accuracy)

?? II. Adjustment Procedures

Mechanical Pressure Switches?

Increasing Threshold?:

  - Loosen adjustment screw counterclockwise

  - Pressurize to target value

  - Tighten clockwise until contacts activate (audible "click")

Differential Setting?:

  Lower limit = Upper limit (e.g., 0.8MPa) - Desired differential (e.g., 0.3MPa → 0.5MPa)

Electronic Pressure Switches?

Modify setpoint via menu interface (long-press function key for calibration mode on some models)

PID algorithm optimization for dynamic conditions

?? III. Key Parameter Standards

Parameter? ?Recommended Range? ?Application Example?

Safety Margin? ≥1.2× operating pressure Rated 10MPa switch ≤8MPa test

Hysteresis Rate? 5%–15% of full scale Food machinery: 5–8%, Industrial: 10–15%

Action Error? ≤±1.0% FS 10MPa scale error ≤0.1MPa

? IV. Critical Prohibitions

Never exceed rated range?: Test pressure ≤80% of rated value

Avoid insufficient hysteresis?: Causes equipment cycling → reduced lifespan

Power off before adjustment?: Always disconnect system power

Post-adjustment Validation?: Cycle pressure 3×; actuation deviation ≤50% of accuracy class

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