Liquid Leak Sensor S50

The S50 is a wireless leak sensor that detects most common liquids — water, oils, coolants and chemicals — with a contact probe, reporting alarms to your server within 30 seconds. Its IP68 probe and enclosure, 17,000 mAh replaceable battery and ultra-low-power design deliver 16+ years of service, while 2,000-record offline logging and SMS alerts (LTE model) keep alarms safe through outages.

BeginSense S50 liquid leak sensor
Key Features

Install once. Protect for years.

Fast alarm reporting

Under 30 seconds to your server

Long battery life

16+ years at one report/day

Rugged sealing

IP68 dust-tight, temporary submersion

Replaceable power cell

17,000 mAh / 3.6 V

  • Detects most liquids — water, chemicals, oils and coolants (not strong acids or alkalis).
  • Event-triggered alerts — wireless alarm reported to your server within 30 seconds.
  • 4G by default — LoRaWAN and NB-IoT variants available for LPWAN deployments.
  • Offline data logging — 2,000 records stored and retransmitted after network outages.
  • SMS alerts — direct notification on the LTE model, no platform required.
  • Optional temperature & humidity — −45 to +135 °C sensing on the probe.
Target Applications

Where a small leak becomes a big loss

Oil depot storage tanks

Oil depots & fuel storage

Early detection of fuel and oil seepage around tanks and pipelines.

Wine cellar barrels

Wine cellars & warehouses

Monitor barrels for damage and catch leaks before they spoil the vintage.

Chemical raw-material warehouse with IBC tanks

Chemical warehouses

Detect leaks the moment they happen, preventing hazards early.

Data center server room

Data & server rooms

Under-floor leak detection with immediate SMS escalation.

Basement utility room

Facilities & basements

Long-life, maintenance-free coverage of remote or hard-to-reach areas.

Specifications

S50 technical specifications

ModelS50-4S50-NS50-L
Bands4G LTE: Global, or B1/3/5/7/8/20/28 (EU), or B2/3/4/5/7/8/28/66 (LA)NB-IoT: GlobalLoRaWAN: EU868 / US915 / AU915 / AS923 / KR920 / IN865
Optional sensors
Temperature & humidityTemperature range: −45.0 to +135 °C · Humidity range: 0 % – 100 %
Battery
Battery3.6 V 17,000 mAh (replaceable)
Battery life>16 years (1 report/day) · >8 years (2 reports/day)
General
Shell materialPC, UL94 V-0 fire rating
Probe materialPPSU
Alert time< 30 s
Working current< 100 mA
Sleeping current50 µA
ProtocolTCP / UDP / MQTT (S50-4 / S50-N) · LoRaWAN (S50-L)
SMS alertSupported (S50-4)
Offline data log2,000 records
SIM typeNano SIM (S50-4 / S50-N)
Operating temperature−40 to +85 °C
Dimension126 × 60 × 47 mm
Weight265 g
Compatibility note: the sensing probe detects most common liquids including water, oils, coolants and chemicals. Strong acids and strong alkalis are not supported.

Available with Pre-installed Global IoT SIM & Subscription Model (For Bulk Orders).

FAQ

Leak Sensor S50 — common questions

The probe detects liquid on contact: when liquid bridges the sensing surface, the sensor state changes and an alarm is generated. Because there are no exposed electrodes, the probe resists corrosion and false alarms from oxidation.

The S50 stores up to 2,000 records locally and automatically retransmits them once connectivity returns. Alarms are queued, not lost.

Yes. The 17,000 mAh / 3.6 V cell is user-replaceable, and with typical reporting (once per day) it lasts more than 16 years — so in most deployments it is never replaced at all.

The compact 126 × 60 × 47 mm enclosure mounts on walls (external probe version) or flat surfaces near the risk area, with the probe placed where liquid would first accumulate. No wiring is needed — power and communication are fully integrated.

Protecting tanks, rooms or a whole site?

Tell us the liquids, areas and networks involved — we will size and spec the right standard S50 deployment. Private-label, firmware and platform-integration support is available for qualified projects.

Talk to an Engineer