Aquastop SHT 226 Water Detector
€88.24
The Aquastop for standing water: switches off before damage occurs
The Schabus Aquastop SHT 226 is a ready-to-plug water detector with a mini float switch and automatic appliance shut-off. It is plugged in as an intermediate adapter between the wall socket and the appliance and detects water or other liquids as soon as they reach a level of approximately 4 cm. It then issues an acoustic and visual warning, and the connected appliance is disconnected from the mains via the integrated socket.
Unlike the SHT 216, this Aquastop does not react to tiny drops but only when liquid collects. This is ideal when water remains in places that you cannot immediately see or reach, for example in lifting stations, tanks or basements. If the pump of a lifting station fails, the water level in the collection tank rises. When the liquid reaches the switching point, an alarm is triggered and the connected appliance is switched off so that no further water can flow in.
Because the float switch operates mechanically, it can also be used for suitable non-conductive liquids such as heating oil, diesel, vegetable oil or lubricating oil, provided they have a density of at least 0.7 g/cm³. In addition, a normally closed solenoid shut-off valve can be controlled via the switchable socket, stopping the supply in the event of a liquid ingress. The appropriate valve is installed by your specialist.
Important note: The Aquastop is operated with 230 V and must not be used outdoors. It must be placed in a protected, dry location and shielded from moisture, splash water and direct sunlight. The float switch is not intended for permanent underwater use; the sensor cable is only briefly water-resistant. After an alarm, the Aquastop does not switch itself back on automatically – it must be reset manually.
Plug in, mount the float switch, be protected
The SHT 226 monitors a liquid level and automatically switches off the connected appliance when the switching point is reached.
Ready to plug in
Plugged in as an intermediate adapter between wall socket and appliance – no battery required and quickly installed.
Reaction from approx. 4 cm
The mini float switch detects rising liquid levels from a height of about 4 cm.
Automatic appliance shut-off
When the switching point is reached, the integrated socket is switched off and the appliance is disconnected from the mains.
Acoustic and visual
An alarm tone and the red status indicator report the alarm directly on the unit.
Also for other liquids
Suitable for water as well as heating oil, diesel, vegetable oil and lubricating oil, provided the density is at least 0.7 g/cm³.
Solenoid shut-off valve controllable
A normally closed valve can be controlled via the switchable socket. Installation is carried out by a specialist.
2.5 m sensor cable, extendable
LIYY control cable, available from the factory in individual lengths or extendable up to 50 m.
Controlled restart
No automatic restart: after the cause has been eliminated, the Aquastop is reset manually by briefly disconnecting it from the mains.
What’s in the box
The Aquastop is supplied ready with float switch and sensor cable.
- Aquastop SHT 226 water detector as intermediate plug-in unit with mains plug
- Mini float switch with connected control cable (2.5 m)
- Operating instructions
How the SHT 226 is constructed
The Aquastop consists of the intermediate plug-in unit with integrated socket and the mini float switch, which is connected via a sensor cable.
Schuko plug
With the Schuko plug, the Aquastop is plugged into a properly installed 230 V socket. It is powered directly from the mains – no battery is required.
Integrated socket with plug lock
The mains plug of the appliance to be monitored is plugged into the socket of the Aquastop. In the event of an alarm, this socket is switched off. The plug lock (protective cover) prevents unintentional unplugging of the connected appliance.
Status indicator
The status indicator lights up green as long as the Aquastop is ready for operation and the appliance is running. In the event of an alarm it lights up red.
Acoustic signal transmitter
The integrated signal transmitter emits a loud warning tone in the event of an alarm that can also be heard at a spatial distance.
Sensor cable LIYY
The 2.5 m long, two-core LIYY cable connects the float switch to the intermediate plug-in unit. It is briefly water-resistant, flame-retardant, self-extinguishing and low-adhesion as well as largely resistant to oils, greases, coolants and lubricants. It is not intended for permanent underwater installation.
Mini float switch made of plastic
The mechanically operating float is in the lower position in the normal state. When the liquid rises to the switching point, it moves upwards and the Aquastop triggers an alarm and shut-off. It must therefore be able to move freely and be installed as vertically as possible.
From normal state to shut-off
The SHT 226 detects an elevated liquid level when the float reaches the switching point, issues an acoustic and visual warning and automatically switches off the connected appliance.
Normal state
The float is in the lower position. The status indicator lights up green and the connected appliance, for example a lifting pump, is in operation.
Liquid level reached
The float moves upwards as soon as the predefined liquid level is reached.
Alarm and shut-off
The alarm sounds, the status indicator lights up red and the connected appliance is switched off. The Aquastop remains in the alarm state until the float is back in its starting position and the Aquastop is briefly disconnected from the mains.
Mount the float switch and plug in the Aquastop
Read the operating instructions carefully before installation and observe the safety instructions.
Mounting the mini float switch
- Select the mounting location: Mount the float switch at the point where the desired liquid level is to be monitored, for example in drip trays, containers or shafts.
- Align the float: The float must be able to move freely and must not be blocked by components, cables, dirt or deposits.
- Observe the installation position: The float switch should be installed as vertically as possible. A lateral tilt is not permitted.
Commissioning
- Mount the float switch as described above.
- Plug the Aquastop into a properly installed 230 V socket.
- Plug the mains plug of the appliance to be monitored into the socket of the Aquastop and secure the protective cover against unintentional unplugging.
- The status indicator lights up green: The Aquastop is ready for operation.
- Then perform the function test.
Extending the sensor cable: If required, the cable can be extended with a thin LIYY cable (max. 2 × 0.14 mm²) up to 50 m. To do this, the existing cable is cut and reconnected with terminals. For longer lines it is advisable to have the connection made by a specialist or to order the desired length directly from the factory. Larger cross-sections can cause malfunctions.
Check the function and react correctly
Perform the function test at least once a month for your own safety.
Function test
- Carefully move the float by hand upwards to the switching point.
- The alarm sounds and the connected appliance is switched off.
- Return the float to the starting position.
- Briefly disconnect the Aquastop from the mains and plug it back in.
Behaviour in the event of an alarm
When the switching point is reached, the alarm sounds, the indicator lights up red and the connected appliance is switched off. The alarm remains active until the Aquastop is disconnected from the mains and the sensor is no longer in the alarm state.
- Eliminate the cause: Eliminate the water leakage or the elevated liquid level.
- Check the sensor: The float must be back in the starting position.
- Reset the Aquastop: Briefly disconnect the Aquastop from the mains.
- Put back into operation: Plug the Aquastop back in. The indicator lights up green.
Causes and solutions
The indicator does not light up
Possible cause: No mains voltage present or the Aquastop is not fully plugged in. Solution: Check whether the Aquastop is fully inserted into the socket and check the voltage supply of the socket with another appliance.
No alarm when switching point is reached or during function test
Possible cause: The float does not reach the switching point or cannot move freely. Solution: Carefully move the float by hand upwards. It must be able to move freely. Check the mounting and repeat the function test.
Liquid level rises but no alarm
Possible cause: The float switch is mounted too high, unfavourably or not in accordance with the intended installation position. Solution: Check the mounting position and installation orientation. The float must be able to move freely and reach the switching point.
The alarm cannot be reset
Possible cause: The float is still in the upper switching position. Solution: Eliminate the cause of the elevated liquid level and check whether the float returns freely to its starting position. Then briefly disconnect the Aquastop from the mains.
The float does not move freely
Possible cause: Dirt, deposits or mechanical obstruction. Solution: Check the float switch and remove any dirt. The float must be able to move freely.
The connected appliance remains switched off
Possible cause: The Aquastop is still in the alarm state. Solution: Eliminate the cause of the alarm, return the float to its starting position and reset the Aquastop by briefly disconnecting it from the mains.
Sensor or cable damaged
Take the Aquastop out of operation. Do not use the device with a damaged sensor or damaged connection cable. If faults persist, please contact support. Do not attempt to open or repair the device yourself.
Manufacturer’s notes
- Read the operating instructions carefully before installation and commissioning and keep them safe; only pass the device on to third parties together with these instructions
- Danger from electrical voltage: Improper handling of the 230 V device can lead to serious injury
- Only use in a technically perfect condition
- Do not open or modify the device; it contains no user-serviceable parts
- Do not use if the housing, mains plug, socket or connection cables are damaged
- Do not operate outdoors and protect from moisture, splash water and direct sunlight
- Do not exceed the permissible switching capacity
- Unplug from the socket before cleaning work
- Packaging material is not a toy and must be kept away from children
- Not for children or persons with reduced physical, sensory or mental capabilities, unless they are supervised or have been instructed in safe use
- Intended for residential, commercial and small business areas with connection to the public low-voltage network
- The Aquastop is used to detect liquid levels and to automatically switch off a connected electrical appliance; it is not approved for other uses
Cleaning and care
The Aquastop is largely maintenance-free. To ensure reliable function, the unit and float switch should be regularly checked for dirt and damage and cleaned if necessary.
- Before cleaning, pull the mains plug of the Aquastop out of the socket. Only clean the device in a de-energised state.
- If necessary, clean the housing with a slightly damp, soft cloth. Do not use aggressive cleaning agents or solvents (e.g. alcohol, petrol) and ensure that no moisture enters the device.
- For the float switch, ensure that the float can move freely. Remove dirt with a damp cloth, then wipe with clean water and dry.
- Do not immerse the device in water or other liquids and allow all parts to dry completely after cleaning before putting the Aquastop back into operation.
Warranty, guarantee and disposal
The SHT 226 is covered by the statutory warranty from the date of purchase, at least 2 years in the EU. The manufacturer Elektrotechnik Schabus additionally offers a 5-year guarantee that can be registered online. Repair and spare parts are available directly from the manufacturer, even beyond the statutory warranty.
The SHT 226 meets the applicable European requirements for the product and bears the CE marking. The complete EU Declaration of Conformity is available for download on the manufacturer’s website.
The Aquastop must not be disposed of with household waste. In accordance with EU Directive 2012/19/EU on waste electrical and electronic equipment (WEEE), it must be collected separately at the end of its service life and sent for environmentally sound recycling, for example via a municipal collection point for electrical equipment. Packaging material should also be disposed of in an environmentally friendly manner (WEEE Reg. No. DE 91394868).
Why the SHT 226 is suitable
No permanent false alarms
Reacts only when liquid collects, not to tiny drops.
Active protection
Automatically switches off the connected appliance and issues acoustic and visual warnings.
Ready to plug in
Plugged between wall socket and appliance, float switch mounted – done.
Versatile
Water, heating oil, diesel, vegetable oil and lubricating oil from 0.7 g/cm³.
Valve control
A normally closed solenoid shut-off valve can be controlled via the switchable socket.
Flexible cable
2.5 m LIYY cable, available from the factory in individual lengths or extendable up to 50 m.
Controlled restart
No automatic restart – only after the cause has been eliminated and a manual reset.
From the manufacturer
Made in Germany, 5-year guarantee can be registered, repair and spare parts directly from the manufacturer.
Areas of application
- Lifting stations of washing machines or dishwashers: switches the machine off before water damage occurs
- Lifting stations and pumps: shut-off when the water level in the collection tank rises
- Heating oil tanks and lubricating oil containers: alarm in the event of overfilling or leakage
- Water storage tanks and rainwater systems: stops pumps or warns before water overflows
- Basements and technical rooms: protection against backflow, pipe bursts or leaking water
- Drip trays, containers and shafts
- Monitoring of standing water in hidden places
- Commerce and trade: machines with coolant or oil
- Holiday homes: protection even when no one is present
- Control of a normally closed solenoid shut-off valve (installation by a specialist)
The Schabus Aquastop SHT 226 switches off and warns before the water becomes a problem. Liquid level detected – damage averted.
Frequently asked questions
When do I need the SHT 226?
Whenever water or other liquids can remain standing and collect, for example in lifting stations, tanks, rainwater storage systems or basements. The SHT 226 automatically switches off appliances and warns you before damage occurs.
What is the difference between the SHT 216 and the SHT 226?
The SHT 216 detects even small amounts of electrically conductive liquids with its fork water sensor. The SHT 226, on the other hand, works with a mechanical mini float switch and reacts to a rising liquid level from about 4 cm. This makes it particularly suitable for lifting stations, tanks and collection containers as well as for certain non-conductive liquids.
How do I install the SHT 226?
Mount the mini float switch, plug the Aquastop into the wall socket, plug the mains plug of the appliance to be monitored into the socket of the Aquastop and secure the protective cover. When the status indicator lights up green, it is ready for operation. A specialist company is only required for the solenoid shut-off valve.
From what level is liquid detected?
Liquid levels from a height of about 4 cm are reliably detected.
How am I warned when liquid is detected?
An acoustic and visual warning is issued: the alarm sounds and the status indicator lights up red. At the same time, the Aquastop switches off the connected appliance.
For which liquids is the SHT 226 suitable?
For water, heating oil, diesel, vegetable oil, lubricating oil and other non-conductive liquids, provided they have a density of at least 0.7 g/cm³. The float switch operates mechanically, so non-conductive liquids are not a problem.
Can I connect a solenoid shut-off valve?
Yes. Normally closed valves can be controlled via the switchable socket. The appropriate valve is installed by your specialist.
Can I extend the float switch cable?
Yes. The cable is 2.5 m long as standard and can be extended with an LIYY cable (max. 2 × 0.14 mm²) up to 50 m. To do this, the existing cable must be cut and reconnected with terminals. For longer lines a specialist is recommended, or you can order the desired length directly from the factory.
Is the float switch waterproof?
The LIYY cable is briefly water-resistant and resistant to oils, greases, coolants and lubricants, but is not suitable for permanent underwater applications.
Can the mini float switch remain permanently underwater?
No. It is not intended for permanent underwater use. It is suitable for monitoring rising liquid levels, for example in lifting stations or collection containers. For applications with permanent underwater exposure, a sensor solution designed for this purpose should be selected.
Does the mini float switch have to be mounted vertically?
Yes. It should be installed as vertically as possible so that the float can move freely. A lateral tilt is not permitted and can impair reliable function.
Can I use the SHT 226 to monitor a lifting station?
Yes, it is particularly well suited for this purpose. If the pump of a lifting station fails, the water level in the collection tank rises. When the liquid reaches the switching point of the mini float switch, an alarm is triggered and the connected appliance is automatically switched off. This prevents further water inflow from the connected appliance.
What happens after an alarm? Does the device switch itself back on automatically?
No. After an alarm, the cause of the elevated liquid level must first be eliminated. Once the float has returned to its starting position, the Aquastop is reset by briefly disconnecting it from the mains. The connected appliance is then ready for operation again.
How can I check the function of the SHT 226?
Carefully lift the movable float by hand. The Aquastop must then trigger an acoustic and visual alarm and switch off the connected appliance. Then let the float drop again and reset the device by briefly disconnecting it from the mains. The manufacturer recommends a monthly function check.
What happens if the float switch is dirty or blocked?
Deposits, dirt or foreign objects can impair the mobility of the float. Therefore, regularly check whether the float can move freely, especially in applications in shafts or rainwater systems.
Can I also use the SHT 226 outdoors?
The mini float switch can be used, for example, in suitable shafts or rainwater systems. The Aquastop socket unit itself, however, must be operated in a protected, dry location. It must not be exposed to rain or splash water.
How long is the guarantee valid?
The statutory warranty of at least 2 years applies in the EU. In addition, the manufacturer Schabus offers a 5-year guarantee that can be registered online.
Questions about the Aquastop SHT 226?
Our support team in Germany will advise you free of charge on selection, installation and configuration.
Aquastop SHT 226 – Water Detector with Float Switch and Device Shutoff
The SHT 226 reliably detects water accumulation using a float switch and can automatically shut off connected devices. Ideal for basements, technical rooms, or household appliances to prevent water damage at an early stage.
Technical Data
- Operating voltage: 230 V AC, 50–60 Hz (±10 %)
- Power consumption: approx. 1.4–3 W
- Switching power: 3500 VA (2300 W) / 16 A (10 A)
- Protection class: IP 20
- Dimensions (HxWxD): 121 × 57 × 38 mm
- Cable length: 2.5 m
- Conductor: 2×0.14 mm², white, Ø 3.2 mm
Alarm
- Sound pressure level: 80–85 dB @ 10 cm
Ambient Conditions
- Operating range: -15 °C to +40 °C
Installation
- Socket device, easy installation
Manufacturer information:
Electrical engineering Schabus GmbH & Co. KG
Baierbacher Straße 150
83071 Stephanskirchen
Germany
Telephone: +49 80 36 / 674 979 – 0
Email: info@elektrotechnik-schabus.de
Responsible person:
Didactum® Security GmbH
Im Mühlenfeld 4
48163 Münster
Deutschland
Fon:
(+49) 250 19 71 63 54 / (+49) 171 33 11 577
Email: info@didactum-security.de
