S-One
Measures how much your roof structure deflects under snow and rain load, around the clock.
DSW ponding water monitoring
Measures ponding water next to your roof drains, every minute, so you know when a drain stops keeping up. It stands next to the drain on a ballast block, charges from its own solar panel and alerts your team during the storm, while someone can still check a blocked drain.
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60 s
Between readings, 20 s at most in intense rain
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±0.2 in
Accuracy (±5 mm)
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0.8–5.9 in
Water level range (2–15 cm)
Why ponding water matters
The problem
Water builds up on a flat or low-slope roof during heavy rain or when a drain is clogged. Storms are getting more intense and harder to predict, so this happens more often.
Water that stays on the roof adds load to the structure, soaks the insulation and shortens the life of the roof covering. The drains have to work, and someone has to know when they don’t.
How it works
DSW stands next to a roof drain on a concrete ballast block, so installation is non-invasive. It measures the height of the water around the drain.
- A reading every 60 seconds, and as often as every 20 seconds during intense rain.
- Each sensor runs on a rechargeable battery charged by its own solar panel. There is no cable to run to any drain.
- Sensors send readings over LoRaWAN to a DSW gateway on the roof. The gateway passes them to the Smart Roofs Platform through its built-in cellular modem, without using the building’s network.
- When the water level crosses a predefined threshold, the platform sends SMS and email alerts to your team.
What your site team gets
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Drain status without a roof walk
See from your desk which drains are holding water.
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When and how long
Every rainfall leaves a record of when water started to build up at each drain and how long it stayed.
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Time to respond
An alert during the storm, while someone can still check a blocked drain.
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Decisions based on data
Maintenance planned on measured water levels helps extend the life of the roof.
Alerts reach your team on their phones and in their inbox. History and reports for each building stay on the Smart Roofs Platform.
- SMS
- App notification
Technical highlights
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Without recharging
25 days
Ni-MH battery, charged by the sensor's own solar panel.
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Range to the gateway
1,970 ft
600 m over LoRaWAN.
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Sensors per gateway
100
4 GB of memory holds 2 million readings.
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On the gateway's backup battery
8 hours
If the power goes out.
DSW sensor
- Water level range
- 0.8–5.9 in (2–15 cm)
- Accuracy
- ±0.2 in (±5 mm)
- Measurement interval
- 1 minute standard, 20 seconds at most
- Power
- Ni-MH rechargeable battery with solar charging, up to 25 days without recharging
- Charging time
- 2 days in full sun (50,000 lx)
- Radio
- LoRaWAN, 915 MHz (US version), built-in antenna, 14 dBm (25 mW)
- Range to gateway
- Up to 1,970 ft (600 m)
- Operating temperature
- −4 °F to 140 °F (−20 °C to +60 °C), outdoors, year-round
- Size without ballast
- 10.9 × 5.4 × 4.8 in (276 × 136 × 122 mm)
- Weight
- 2.0 lb (0.9 kg), 8.2 lb (3.7 kg) with ballast
- Other sensors
- Rollover and movement detection
DSW gateway
- Power
- 120 VAC single-phase; 15 W, 63 W while the backup battery charges
- Backup battery
- Built-in UPS, 12 V 7 Ah, up to 8 hours; full recharge in 4 hours
- Capacity
- Up to 100 DSW sensors; 4 GB memory (2 million readings)
- Internet connection
- Built-in cellular (GSM) modem, independent of the building’s network
- Wired ports
- Ethernet (RJ45) for a permanent link; Ethernet (RJ45) for BMS integration
- Sensor radio
- 915 MHz ISM band, external antenna, 500 mW (27 dBm), star topology
- Self-monitoring
- Power failure, case opening, backup battery voltage and low-battery warning, internal temperature
- Option
- External temperature, humidity and pressure sensor (THP)
- Housing
- Surface-mounted plastic, IP65, UV resistant, 5.9 × 15.7 × 19.7 in (15 × 40 × 50 cm)
- Operating temperature
- −13 °F to 140 °F (−25 °C to +60 °C)
What to plan for before installation
- The DSW sensors are wireless and solar powered.
- The DSW gateway needs a 120 VAC single-phase supply where it is mounted on the roof. One gateway serves up to 100 sensors.
- The gateway keeps running on its built-in backup battery for up to 8 hours if the power goes out.
- An Ethernet port is available for a permanent link, and a second one for integration with your building management system (BMS).
What customers say about DSW
“Thanks to the Sense S-One and Sense DSW systems, the roof load is monitored continuously and the roof drains are checked effectively for blockages.”
Translated from the Polish original of the reference letter.
Other parts of the system
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Smart Roofs Platform
One place for every roof you manage, with live readings, alerts and weather warnings.
