Technical Specification Sheet Document No. 149-931 August 18, 2016 Siemens Industry, Inc. Page 1 of 2 QXA Series Condensation Monitors QXA2100 (Switch Point = 95%) QXA2101 with Remote Sensor (Switch Point = 95%) Description The QXA Series Condensation Monitors are used to avoid damage due to condensation on chilled ceilings and other HVAC installations. All QXA devices are equipped with an SPDT dry contact capable of switching 1 amp @ 24 Vac or 0.5 amp @ 24 Vdc. The switching point is approximately 95% rh. with a switching differential of 5% rh (Switch Point minus 5% rh). Hardware is included for installation on pipes with outside diameters from 0.39 to 3.94 inches (10 to 100 mm). The QXA2101 features a remote sensing element for use in difficult to reach spaces. Equipment Combinations The QXA Series condensation monitors can be used in any 24V AC/DC control circuit and can be wired NO or NC to provide indication of pending condensation. Typical Application The condensation monitor acquires the relative humidity near the pipe surface, and the SPDT relay changes state as the relative humidity approaches the dew point. Reset occurs automatically when the relative humidity decreases to approximately 5% rh below the switching point. In chilled ceiling applications, the 24V power to the chilled water valve actuator is wired through the NC contact on the QXA Sensor. As measured relative humidity approaches dew point, the contact opens to interrupt power to the valve actuator. Proper operation requires that the valve actuator be power-to-open with a spring return actuator. The QXA Series devices can also be used to help prevent condensation on pipes and other surfaces throughout the HVAC system. Specifications Power Requirements Operating voltage Frequency Power consumption 24 Vac/Vdc + 20% 50/60 Hz Maximum 1 VA Switching Points Switching differential Response time in static air 95% + 4% rh @ 77°F ≈ 5% rh 3 minutes (maximum) Output Relay output Switching capacity (24V) SPDT dry contact AC = 1 amp; DC = 0.5 amp Enclosure IP54 (≈NEMA 3) Shipping weight 8 ounces (227 g) Information in this document is based on specifications believed correct at the time of publication. The right is reserved to make changes as design improvements are introduced. Products or company names mentioned herein may be the trademarks of their respective owners. © 2016 Siemens Industry, Inc. Siemens Industry, Inc. Building Technologies Division 1000 Deerfield Parkway Buffalo Grove, IL 60089-4513 USA Tel. +1-847-215-1000 Your feedback is important to us. If you have comments about this document, please send them to sbt_technical.editor.us.sbt@siemens.com. Document No. 149-931 Printed in the USA Page 2 of 2 Wiring Figure 1. Wiring Diagram. G (G+) Operating voltage AC 24V or DC 24V G0 (G ) System neutral Q... Potential free changeover contact AC/DC 1 to 30V Dimensions Figure 2. QXA2100 Dimensions. Figure 3. QXA2101 Dimensions. Next >