Johnson Controls C-5230-3 Signal Limiter

The Johnson Controls C-5230-3 Signal Limiter is a critical component for pneumatic control systems, designed to maintain precise operational boundaries by capping output pressure. Functioning as a proportional direct-acting limiter, this unit ensures that branch line pressures stay within a calibrated range, preventing equipment strain or process deviations. It features a high and low limit configuration, providing a 1:1 ratio between limits during standard operation. With a supply pressure rating of 13-25 psig, it integrates seamlessly into existing HVAC pneumatic loops. The low limit adjustment ranges from 2 psi above to 1 psi below supply pressure, while the high limit adjustment allows for 3 psi above to 1 psi below supply pressure. This level of field-adjustable precision is essential for technicians managing pneumatic actuator calibration and damper control sequences where signal integrity is paramount.

Key Technical Benefits

• Dual-Limit Protection: Restricts pneumatic signals to a defined window, protecting sensitive final control elements.
• High Signal Fidelity: Maintains a 1:1 transmission ratio when the signal is within the set high and low parameters.
• Versatile Range: Supports supply pressure ranges from 13 to 25 psig, suitable for most commercial pneumatic control air systems.
• Field Calibration: Independent high limit and low limit adjustment screws allow for localized tuning based on specific airflow control requirements.
• Direct-Acting Reliability: Minimal moving parts ensure long-term stability in analog pneumatic circuits.

Common Questions

Can the C-5230-3 be used as a pressure repeater?
While it maintains a 1:1 ratio within its set limits, its primary function is signal limiting. If the input exceeds the high setpoint or drops below the low setpoint, the device will clamp the output, unlike a standard pneumatic repeater.

What is the impact of supply pressure fluctuations?
This unit is designed for a nominal supply pressure of 20 psig. Significant variations outside the 13-25 psig range can shift the proportional output and affect accuracy.

How do I adjust the high and low limits?
Technicians can adjust the limits using the internal adjustment screws. Use a calibrated pneumatic test gauge to verify the 1:1 ratio and the specific cutoff points for the high and low limit adjustments.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.