Armstrong International A6942 Humidistat

The Armstrong International A6942 Humidistat is a high-performance duct mounted high limit pneumatic humidistat designed for precise industrial and commercial humidity management. Engineering for the demanding environments of hospitals, laboratories, and printing plants, this high limit RA duct hygrostat operates within a critical 55-95% relative humidity (RH) range. Its reverse-acting pneumatic mechanism utilizes a highly sensitive hygroscopic membrane to prevent over-humidification in HVAC duct systems. Key technical features include a bimetal temperature compensation system to maintain accuracy across varying thermal conditions, up to 30 psig maximum supply pressure, and adjustable sensitivity ranging from 1/4 to 4 psi per 1% RH. This OEM component ensures your pneumatic control system remains within safe moisture limits, protecting sensitive equipment and improving indoor air quality. By integrating this duct hygrostat, facilities can maintain strict set points while minimizing air consumption, with a normal supply pressure of 15 to 25 psig for optimal commercial HVAC maintenance.

• High Limit Precision: Specifically calibrated for the 55-95% RH range to prevent condensation and moisture damage in supply ducts.
• Temperature Compensated: Integrated bimetal element offsets temperature fluctuations to ensure consistent humidity readings.
• Flexible Installation: Designed with a slide-base duct-mounting box for easy calibration access and maintenance.
• Adjustable Sensitivity: Fine-tune the pneumatic output from 1/4 to 4 psi per 1% RH to match your specific system requirements.
• Industrial Durability: Robust construction suitable for high-demand environments like schools, hospitals, and textile mills.

• What is the primary function of a high limit humidistat? It acts as a safety device in the ductwork to shut down humidification if the moisture levels exceed the safe 55-95% RH threshold, preventing mold and duct saturation.
• Is the A6942 direct or reverse acting? The Armstrong A6942 is a reverse-acting (RA) instrument, meaning a decrease in humidity causes an increase in the pneumatic air signal.
• What air pressure is required for operation? It typically operates with a normal supply pressure of 15-25 psig, with a maximum rating of 30 psig.

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.