The ES-02 Condensation Monitor is a high-precision anti-condensation sensor designed specifically for chilled beam and radiant cooling systems. It monitors surface relative humidity in real time and triggers early warnings to the BMS before condensation forms, effectively preventing water damage, dripping, and mold growth.
Item No.: ES-02
Early Condensation Prevention: Detects rising surface humidity before visible dripping occurs, protecting chilled beams, radiant panels, and ceilings from water damage and mold.
High-Precision RH Sensing: Accurate measurement range of 10%–100% RH with premium sensing elements for reliable localized detection.
Versatile Dry Contact Relay: Potential-free changeover contact (24V AC/DC, 0.5A) for seamless integration with any controller or BMS.
Stable Operation: Built-in 5% RH hysteresis prevents false triggering and system hunting.
Flexible Installation: Supports wall mounting or pipe mounting (up to diameter 50mm) with included thermal conductive film for accurate surface temperature reading.
Full BMS Integration: Native support for BACnet and Modbus protocols, ideal for smart building automation projects.
In modern chilled beam and radiant cooling applications, surface condensation poses a serious risk of water damage, mold growth, and costly system downtime. The ES-02 Condensation Monitor serves as a proactive 24/7 guardian, directly measuring relative humidity on the coldest surfaces such as cooling pipes, beams, or ceilings.
When the surface relative humidity reaches the preset switching point (90% +/- 3% RH), the ES-02 immediately activates its potential-free relay output. This signal can be sent to your Building Management System (BMS) to raise chilled water temperature, close valves, or trigger an alarm — all before condensation actually forms.
ISO Certified Production: Every ES-02 unit is manufactured in an ISO 9001:2015 and ISO 14001:2015 certified facility.
Compliance Standards: Fully certified with CE (RED/EMC/LVD), RoHS, and FCC marks for global market access.
OEM Experience: Backed by E-TOP Controls, a professional manufacturer with over 20 years of experience (since 2003) in ODM/OEM services.
Looking for a seamless integration? The ES-02 Condensation Monitor is designed to work perfectly with our professional controllers.
Explore our BACnet MS/TP Thermostats
View Professional FCU Thermostat Solutions
| Category | Feature | Detailed Specification |
| Power | Power Supply | 10–24V AC/DC +/- 20% |
| Sensing | Humidity Range | 10–100% RH, non-condensing |
| Humidity Threshold | 90% +/- 3% RH (at 24V AC/DC, 20°C) | |
| Humidity Hysteresis | 5% RH | |
| Control | Relay Output | Changeover contact, potential-free (Dry contact) |
| Switching Capacity | Max. 24V AC/DC, 0.5A | |
| WET Contact | Contact for RH > 90%, Power off (NC) | |
| DRY Contact | Contact for RH < 85%, Power on (NO) | |
| Integration | Protocol | Modbus RTU / BACnet MS/TP (Optional) |
| Electrical Connection | 5-pole push-in terminal, max. 1.5 mm2 | |
| Mount Type | Wall mount or Pipe mount (Max. diameter 50mm) | |
| Thermal Coupling | Specialized Thermal Conductive Film (Included) | |
| Physical | Material | ABS + PC (Flame retardant, RoHS certificated) |
| Protection Class | IP40 | |
| Product Size | 69.3 x 56.3 x 21 mm | |
| Environment | Operating Temp. | 0 to 50 Celsius |
| Storage Temp. | -20 to +70 Celsius | |
| OEM & ODM | Customization | 1. Customized logo and package |
| 2. Customized UI and control logic | ||
| 3. Customized hardware (PCB & schematic) | ||
| Certificate | Compliance |
CE (RED/EMC/LVD), UKCA, FCC, ETL Listed, RoHS, REACH, ISO9001:2015, ISO14001:2015 |
A: Yes. E-TOP has been a professional ODM & OEM manufacturer since 2003, specializing in HVAC controls, smart thermostats, and environmental sensors such as the ES-02 Condensation Monitor. Our 20+ years of experience ensure high-quality R&D and stable supply.
A: Absolutely. We offer full brand customization. Logo printing is free with MOQ of 500pcs, and custom packaging is available with MOQ of 1000pcs.
A: Yes. The ES-02 natively supports BACnet and Modbus protocols for seamless BMS integration. Our full thermostat range also offers WiFi connectivity with smartphone app control (Android/iOS) and voice control via Alexa and Google Assistant.
A: Samples can be ready in 3 working days, and mass production lead time is approximately 25 days. All sensors and thermostats come with a standard 1-year warranty.
A: The ES-02 uses a specialized thermal conductive film and direct surface mounting (wall or pipe), allowing it to measure localized surface relative humidity with much higher precision and faster response than general room humidity sensors.
A: Our products are fully compliant with international standards, including CE (RED/EMC/LVD), UKCA, FCC, ETL Listed, RoHS, and REACH. Furthermore, our manufacturing facility is certified with ISO9001:2015 for Quality Management and ISO14001:2015 for Environmental Management, ensuring the highest level of reliability and sustainability.
The ES-02 Condensation Monitor is a high-precision anti-condensation sensor designed specifically for chilled beam and radiant cooling systems. It monitors surface relative humidity in real time and triggers early warnings to the BMS before condensation forms, effectively preventing water damage, dripping, and mold growth. Item No.: ES-02 Early Condensation Prevention: Detects rising surface humidity before visible dripping occurs, protecting chilled beams, radiant panels, and ceilings from water damage and mold. High-Precision RH Sensing: Accurate measurement range of 10%–100% RH with premium sensing elements for reliable localized detection. Versatile Dry Contact Relay: Potential-free changeover contact (24V AC/DC, 0.5A) for seamless integration with any controller or BMS. Stable Operation: Built-in 5% RH hysteresis prevents false triggering and system hunting. Flexible Installation: Supports wall mounting or pipe mounting (up to diameter 50mm) with included thermal conductive film for accurate surface temperature reading. Full BMS Integration: Native support for BACnet and Modbus protocols, ideal for smart building automation projects.
Learn More
Address:No.6 of Tong'an Industrial Park, Meixi Rd,Tong'an District, Xiamen China 361100
Phone:+86 0592 6155792
Email:info@etopcontrols.com
