Water detector with float sensor

Warns when the liquid
level rises or falls


Mobeye WaterGuard-FS

The Mobeye WaterGuard-FS is a highly reliable water detector for reporting changes in the water level. The alarm notifications are sent via a push message, telephone call, SMS or e-mail.

Battery operated water detector with float,
you will receive the alert by phone.

Using the float sensor, the Mobeye WaterGuard-FS monitors the water level in a tank, basin, or pool. A second float sensor can be used to monitor a second water level. Fully battery-powered or on external power. If an external power source is used and a power outage occurs, it also sends a power failure message.

This product is the successor of the Mobeye CM2300FS.

Float sensor

The water float sensor has a moving part that moves up and down due to rising or falling water. Internally it has a magnetic contact (“reed contact”). The water level opens or closes the float. The float is installed horizontally, preferably with the hanging part down. If there is no suitable wall to fix the float, a stainless steel support lath (with hole) may help.
For detecting water leaks, we recommend the CM4300 (version with a leak sensor).

Alarm messages

In the event of an alarm, the Mobeye WaterGuard-FS sends alarm notifications by app (IOS/Android), telephone call (voice message), text message and/or e-mail. For the push messages there is a choice between an escalation plan or group message. With the escalation plan, the recipient can confirm the push message, so that the other contacts no longer receive the message. If none of the recipients confirms the push message, a phone call is made. The number of contacts is unlimited.

External voltage vs battery powered

The Mobeye WaterGuard-FS can run on batteries for a long time which makes it independent of an external power source. Optionally, a mains adapter is connected (12-24V DC). In this case, the power supply is also monitored. If there is outage, a message will be sent. The internal batteries ensure that the alarm device continues to work for a long time. The WaterGuard-FS will continue to monitor the water level and input contacts and will still report alarms. Once the power restores a notification will be sent.

Potential-free alarm inputs

In addition to the level sensor, the Mobeye WaterGuard-FS (CM4300FS) has a second NO/NC input for connecting an alarm contact or sensor. This is meant to monitor a second float, or the status of a device, such as a water pump.

Network and SIM card

The Mobeye SIM card gives the device full functionality, including the use of the Mobeye Internet Portal and the app. With the Mobeye SIM card, communication takes place over the 4G LTE-M network with 2G as fallback.
When you insert your own SIM card, the device works on 2G. Alarm messages are then sent via SMS and/or call to max. 5 telephone numbers.

Mobeye WaterGuard-FS
  • Tank
  • Water basin
  • Grey and clean water
  • Bilge water
  • Swimming pool

Reliable and understandable

  • Alarm via app, call, SMS and email
  • Water level signaling
  • Power failure monitoring (if connected to external voltage)
  • NO/NC alarm input
  • Easy to use
  • Full insight into device when connected to Mobeye Internet Portal


Mobeye WaterGuard-FS

Summary of features


  • detection of water level
  • power failure monitoring
  • second alarm input (NO/NC)


  • to private contacts via an app, call, SMS and/or email


  • water alarm and recovery
  • power outage and power recovery
  • input alarm, (optional) alarm reset
  • battery low voltage, (missed) test message

Other settings

  • delay time on water, input and power failure alarm
  • alarm repeat interval
  • inputs adjustable as NO or NC
  • identification text, alarm texts

Mobeye SIM card (option)

  • online activation
  • gives access to Mobeye Internet Portal and App
  • communication via 4G LTE-M and 2G Quadband EGSM
  • low-cost, flat-fee, multi-provider

Mobeye Internet Portal and App
(when using Mobeye SIM card)

  • alarm per push messages/SMS/call/email/ARC
  • push messages as group message or sequential
  • status display
  • online programming
  • keep-alive monitoring
  • position display (Cell-ID)

Own SIM card (option)

  • alarm notifications via SMS text message and call to max. 5 contacts
  • communication via 2G Quadband EGSM


  • 94 x 94 x 28 mm

Power supply

  • 12-24V DC + 2x CR123, or
  • 2x CR123

Battery life

  • 1 year (if battery-operated)
  • 3 years (external power)

Communication module

  • 4G LTE-M (WW) + 2G Quadband EGSM 850/900/1800/1900 MHz


  • CM4300FS
  • float sensor
  • 2x CR123 batteries
  • Mobeye SIM card (optional use)

Accessories (not included)

  • mains adapter (country specific), external antenna