SHT 5002 DIN Rail Water Detector
€91.60
The Level Controller for DIN Rail: Two Float Switches Control Filling or Emptying, an Independent Alarm Line Protects Against Overflow
The Schabus water alarm SHT 5002 is a 2-point level control device for installation in distribution boards, control cabinets or surface-mounted enclosures. Two sensors define a lower and an upper level, between which the SHT 5002 automatically fills or empties a container. For this purpose it switches a connected pump or valve via a potential-free changeover relay.
In addition, the SHT 5002 has a third, completely independent alarm line with its own relay. It reports water outside the desired range, for example in the event of pump failure, a leak or an overflow. On request it stores the alarm until you acknowledge it.
The level controller is suitable for cisterns, tanks, pump sumps, garden ponds and pools. In combination with mini float switches it can also be used for other liquids such as heating oil, diesel, vegetable oil, lubricating oils or distilled water. The device operates with maintenance-free microcontroller technology.
Important note: Installation and electrical connection must be carried out by a qualified specialist. Isolate the device from the supply before working on it. Float switches or water sensors are not included in the scope of delivery and must be ordered separately.
Good to know: The level control (S1 and S2) and the overflow alarm (S3) operate independently of each other. If the pump fails, S3 can still raise an alarm. To protect against a missing alarm, the manufacturer recommends checking the system regularly for correct function.
Control and Monitor in One Device
The SHT 5002 combines 2-point level control with an independent overflow alarm and can be easily configured via wire bridges.
2-Point Level Control
Two sensors define the lower and the upper level. The pump operates only within the defined range.
Filling or Emptying
With or without wire bridge B1 you set the switching behaviour of relay K1 for filling or emptying.
Independent Overflow Alarm
The third alarm line S3 has its own relay K2 and its own LED and operates independently of the level control.
Memory Function
With wire bridge B2 the alarm remains active until you acknowledge it by pressing the button.
Two Potential-Free Changeover Contacts
One potential-free changeover contact each for the level control (K1) and for the alarm (K2).
Also for Other Liquids
With mini float switches also suitable for heating oil, diesel, vegetable oil, lubricating oils and distilled water.
LED Status Indication
Two LEDs show the status of the level control and the overflow alarm at a glance.
TEST and RESET Buttons
With TEST you simulate a water alarm at S3, with RESET you acknowledge relay K2.
230 V AC or DC Voltage
The device is operated from the mains. Alternatively, operation with DC voltage via terminals 5 (+) and 6 (−) is possible.
DIN Rail Housing
The housing is mounted on a 35 mm DIN rail (DIN EN 502).
What's in the Box
The SHT 5002 has no options and no additional variants. The matching sensors or float switches must be ordered separately.
- Level controller SHT 5002
- Mounting material
- Operating instructions
Float switches or water sensors are not included; see section “Suitable Sensors and Accessories”.
How the SHT 5002 Is Constructed
The compact DIN rail device has a control front with indicators and buttons as well as connection terminals at the top and bottom of the housing.
DIN Rail Housing
The housing is installed in a distribution board, control cabinet or surface-mounted enclosure on a 35 mm DIN rail. It is intended for use in residential buildings, sales areas and rooms of small businesses such as workshops and service centres, i.e. at locations with connection to the public low-voltage network.
Indicators: LED “Sensor S3” and LED “Level S1-S2”
The LED “Level S1-S2” shows the status of the level control (relay K1), the LED “Sensor S3” the status of the overflow alarm (relay K2).
TEST and RESET Buttons
With the TEST button you simulate a water alarm at input S3. With the RESET button you acknowledge relay K2 during a sensor alarm.
Connection Terminals for Voltage and Relays
Here you connect the operating voltage (L and N, alternatively DC voltage at terminals 5 and 6) as well as the two changeover contacts K1 and K2. K1 switches the pump or valve, K2 a signal horn, warning light or other signalling device.
Sensor Terminals S1, S2 and S3
S1 is the input for the lower level, S2 for the upper level, S3 for the independent alarm line. The sensor cables can be up to 50 m long.
Terminals for the Wire Bridges B1 and B2
With B1 you set filling or emptying, with B2 you activate the memory function of alarm S3. A bridge means “ON”, no bridge means “OFF”.
How the SHT 5002 Works
With sensor 1 you define the lower level, with sensor 2 the upper level. Via wire bridge B1 you determine how relay K1 switches.
Fill Container (without Bridge B1)
Water level below sensor 1: relay K1 picks up, the pump runs. Water level at sensor 2: relay K1 drops out, the pump stops.
Empty Container (with Bridge B1)
Water level at sensor 2: relay K1 picks up, the pump runs. Water level below sensor 1: relay K1 drops out, the pump stops.
Sensor Alarm S3
With sensor 3 you define a water level height independently of the level control. If the water level is below sensor 3, relay K2 is picked up. When water touches sensor 3, K2 drops out.
Where Is Sensor 3 Placed?
Mounted above sensor 2 it provides an overflow alarm in the event of pump failure. Below sensor 1 a dry-run alarm to protect the pump. Between sensor 1 and 2 a water level alarm.
With Memory Function (Bridge B2)
The alarm remains active until it is cleared by pressing the button. LED and relay K2 must be acknowledged as soon as the water no longer touches sensor 3.
Without Memory Function (without Bridge B2)
The alarm remains only as long as the sensor reports water. Then the LED goes out and relay K2 picks up again.
Status Check at a Glance
The two LEDs on the device front show you the status of the system at any time.
Level S1-S2 Lights Green
Relay K1 is dropped out, the pump is off.
Level S1-S2 Flashes Green
Relay K1 is picked up, the pump is active.
Sensor S3 Flashes Red
Water at sensor 3, relay K2 is dropped out, the alarm is active.
Sensor S3 Lights Red
The alarm has been acknowledged with RESET, relay K2 is picked up. There is still water at sensor 3.
If the LED “Sensor S3” is off, no water is detected.
Which Sensors You Can Connect
For S1 and S2 the manufacturer recommends mini float switches. They must be ordered separately. The SHT 5002 itself has no options.
Mini Float Switches
Recommended for level control and for the overflow alarm. They switch precisely, are barely susceptible to interference and operate mechanically, i.e. independently of the conductivity of the liquid. They are available in plastic (article 200940) and stainless steel (article 200941).
Hanging Float Switch
Article 200950, ideal when drilling is not possible. It is suspended from above, the flanged weight keeps it vertical, the PG gland allows stepless height adjustment. Also suitable for tanks that must not be drilled, for example enamelled troughs in agriculture.
Water Sensors
Suitable as an alternative, but only for conductive liquids and regularly dry environments, for example the fork sensor SHT 5006 (article 300745). Particularly useful for the overflow alarm at S3, e.g. on the floor.
LIYY Control Cable
For extending the cables of float switches and sensors. Up to 50 m cable length is possible per input.
External Signalling Devices
Signal horn, warning light (e.g. flashing light, article 200894), valve or smart module can be controlled via the overflow relay K2.
Mounting Bracket
Mounting bracket (article 300787) for fixing a mini float switch, for example to a side wall.
Install, Connect, Test
Installation and connection must be carried out by a qualified specialist.
Installation
- Isolate the system and verify absence of voltage.
- Mount the SHT 5002 in a distribution board, control cabinet or surface-mounted enclosure on a 35 mm DIN rail.
- Choose the installation location so that the device is protected from moisture (splash or rain water), dust and direct sunlight.
Connection and Configuration
- Connect the operating voltage. Alternatively you can operate the device with DC voltage via terminals 5 (+) and 6 (−).
- Mount the sensors: sensor 1 for the lower level, sensor 2 for the upper level. Floats must not get caught on the container wall, cables or deposits.
- Select the operating mode: fill container without wire bridge B1, empty container with wire bridge B1.
- If required, mount sensor 3 for the alarm line, above sensor 2 (overflow), below sensor 1 (dry run) or between them (water level alarm).
- Decide whether alarm S3 should operate with memory function (wire bridge B2) or without.
- Connect pump or valve to relay K1 and signalling device to relay K2. Observe the permissible switching capacity of the relays.
Notes on the Sensor Cables
- Up to 50 m sensor cable is possible per input (S1, S2 and S3)
- The manufacturer’s LIYY control cable is suitable for extensions
- Longer distances can lead to signal interference or malfunctions
- Ensure clean routing
Commissioning and Functional Test
- Test of sensor alarm S3: Press the TEST button. The device simulates a water alarm at input S3.
- Test of the level control: Touch the sensor contacts one after the other with a cloth soaked in water or with electrically conductive metal to simulate a change in water level.
- Observe the LEDs and the response of pump, valve and signalling device.
- Repeat the functional test regularly.
How the SHT 5002 Is Used
Fill Container
Two float switches define the lower and upper level, a third reports the overflow, for example via a signal horn on relay K2.
Empty Container
The pump starts at the upper level and stops at the lower level. A third sensor reports the overflow in the event of pump failure.
Cistern with Soakaway
The SHT 5002 controls the drinking water top-up via a valve. The height difference between S1 and S2 should save one day’s drinking water requirement and leave sufficient space for the next rain. A hanging float switch (article 200950) avoids drilling the cistern. A mini float switch (article 200940) with mounting bracket (article 300787) in the soakaway detects if water is not draining properly, e.g. due to contamination, and triggers a flashing light.
Water Top-Up for Pool or Pond
If float S1 sinks to its lower level, the pump starts or a valve opens. When the upper level at S2 is reached, the pump stops or the valve closes again.
Extended Top-Up in Hot Summer
For ponds with fish stock: In addition a thermostat with temperature sensor can also trigger top-up at elevated temperature; its normally closed contact is connected in series with S1. If the temperature cannot fall below the set value, the thermostat relay may only switch for a limited time, for example via a time relay.
Clean and Check
- Keep moisture (splash or rain water), dust and direct sunlight away from the device
- Clean only with a dry linen cloth; in case of heavy soiling it may be slightly dampened
- Do not use solvent-containing cleaning agents
- Check the system regularly for correct function
- The device is maintenance-free and contains no parts that you need to maintain
Manufacturer’s Notes
- Read the operating instructions thoroughly before installation and commissioning and keep them
- Installation must be carried out by a qualified specialist
- Work on mains voltage only in the isolated state
- Intended use: 2-point level control with additional alarm line
- Packaging material is not a children’s toy and does not belong in children’s hands
- The manufacturer is not liable for damage or losses arising from the fact that no alarm signal is given despite water ingress
- Repairs and maintenance may only be carried out by the manufacturer or authorised specialist personnel
What the SHT 5002 Does Not Do
- It has no own acoustic alarm. Signal horn or warning light are connected externally via relay K2
- It contains no sensors. Float switches or water sensors must be ordered separately
- It controls two levels. It does not provide continuous level measurement
- Water sensors detect only conductive liquids and are intended for regularly dry environments. For non-conductive liquids use mini float switches
- The suitability of the float switches for chemicals and cleaning agents depends on the float switch material
- It is an indoor device in a DIN rail housing and is not protected against splash or rain water
If Something Does Not Work as Expected
Pump Switches the Wrong Way Round?
Check wire bridge B1: without bridge filling is selected, with bridge emptying is selected.
Alarm S3 Remains Active?
Check whether the memory function (wire bridge B2) is set. Then the alarm must be acknowledged with RESET as soon as the water no longer touches sensor 3.
Unexpected Alarm or Fault?
Check the length of the sensor cables (up to 50 m per input) as well as their routing and connections.
If the fault persists, put the system into a safe state and contact Schabus Support.
In Case of Service and Return
- Get in touch if the device is defective and state your complete address as well as the reason for return.
- Within Germany the manufacturer will send you a free return label by e-mail.
- Pack the device adequately. Enclose a fault description, proof of purchase as well as your address and delivery address (name, telephone number, street, house number, postcode, city, country).
The manufacturer cannot accept unfree parcels. Unauthorised returns that do not constitute a complaint will be charged subsequently.
Warranty, Guarantee and Disposal
The SHT 5002 is covered by the statutory warranty of at least 2 years in the EU. In the event of material defects and quality deficiencies the manufacturer repairs or replaces the device free of charge provided it has been used in accordance with the operating instructions. In addition, Elektrotechnik Schabus 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 device bears the CE marking. The declaration of conformity can be found on the manufacturer’s website.
The SHT 5002 does not belong in household waste. The crossed-out waste bin symbol reminds you to use the take-back systems so that the materials can be reused in an environmentally friendly manner at the end of the service life (WEEE Reg. No. DE91394868). Further information is available from the waste advice centre of your city or from the manufacturer.
Why the SHT 5002 Is Suitable
Control and Monitor
Level control and independent overflow alarm in one DIN rail device.
Easily Configurable
Filling, emptying and memory function adjustable via wire bridge.
For Many Liquids
With mini float switches also for oils, diesel and distilled water.
Possible Without Drilling
With the hanging float switch that is simply suspended in the container.
Clear Status Indication
Two LEDs as well as TEST and RESET buttons for checking and acknowledgement.
From the Manufacturer
Personal expert advice, 5-year guarantee registrable, repair and spare parts directly from the manufacturer.
Application Areas
- Cisterns and rainwater harvesting
- Tanks
- Pump sumps
- Garden pond and pool, water top-up
- Livestock troughs
- Technical rooms
- Industrial level control
- Overflow protection
- Overflow alarm in the event of pump failure
- Dry-run alarm to protect the pump
- Water level alarm
The Schabus water alarm SHT 5002: control safely, monitor reliably.
Frequently Asked Questions
What is a 2-point level controller and how does it work?
A 2-point level controller such as the SHT 5002 operates with two defined switching points, the lower and the upper level. Depending on whether filling or emptying is required, it switches automatically between these points. The connected pump always operates only within the defined range, ensuring safe and energy-efficient operation.
What is the difference between “filling” and “emptying”?
This is determined by wire bridge B1. Without bridge (filling) the pump starts when the water level falls below the lower level and stops when the upper level is reached. With bridge (emptying) the pump starts when the upper level is reached and stops when the water has fallen below the lower level.
Which sensors can I connect to the SHT 5002?
For level control (S1 and S2) the manufacturer expressly recommends mini float switches, as they switch precisely, are barely susceptible to interference and can also be used in liquids such as diesel or oil. For the overflow alarm (S3) water sensors or an additional float switch are possible. Water sensors are particularly suitable for regularly dry surfaces, float switches better for level monitoring.
Are float switches included in the scope of delivery?
No. The box contains the level controller, the mounting material and the operating instructions. Float switches or sensors must be ordered separately.
Can I also use the SHT 5002 with oil, diesel or distilled water?
Yes, if you use mini float switches. These operate mechanically and are independent of the electrical conductivity of the liquid. This makes the SHT 5002 suitable for many non-conductive or critical media such as diesel, heating oil, lubricating oil and distilled water, also for cleaning agents or chemicals provided they are compatible with the float switch material.
I do not want to drill my tank. Is it possible without?
Yes, the hanging float switch (article 200950) is available for this. It is simply suspended from above; the flanged weight always keeps it vertical in the water. The PG gland allows stepless height adjustment; fixed installation is not required. Ideal for tanks that must not be drilled.
How does the overflow alarm work?
The second alarm line (sensor S3, relay K2) detects water outside the desired range, for example in the event of a pump defect, a leak or an overflow. As soon as water is detected, the red LED flashes, relay K2 drops out and connected signalling devices such as horn, valve or smart module are activated. Optionally the alarm can be stored and acknowledged manually.
How do I activate the memory function?
Fit wire bridge B2. Then LED and relay K2 remain in the alarm state until you acknowledge, even if the water no longer touches sensor 3. Without bridge B2 the LED goes out and relay K2 picks up again as soon as the water no longer touches sensor 3.
How do I acknowledge the alarm?
Relay K2 can be acknowledged separately with the RESET button during sensor alarm S3. In this case the LED “Sensor S3” lights red as long as the water still touches sensor 3.
How far may the sensor be from the device at most?
For reliable function a maximum cable length of 50 metres per input (S1, S2 or S3) must be observed. Longer cable runs can lead to signal interference or malfunctions. Ensure suitable cable lengths and clean routing. The manufacturer’s LIYY control cable is suitable for extension.
What do the LEDs indicate?
The green LED “Level S1-S2” lights continuously when the pump is off and flashes when the pump is active. The red LED “Sensor S3” is off when no water is detected, flashes when water is detected and the alarm is active, and lights permanently when the alarm has been reset manually but water is still present.
How do I test the function?
For sensor alarm S3 press the TEST button; this simulates a water alarm at input S3. For the level control touch the sensor contacts one after the other with a cloth soaked in water or electrically conductive metal to simulate a change in water level. The manufacturer recommends checking the system regularly for correct function.
Can I operate the device with DC voltage?
Yes. Instead of 230 V mains voltage you can alternatively operate the SHT 5002 with DC voltage. Use terminals 5 (+) and 6 (−) for this. The permissible values can be found in the data sheet.
How do I clean the device?
Only with a dry linen cloth, which may be slightly dampened in case of heavy soiling. Do not use solvent-containing cleaning agents. Keep moisture, dust and direct sunlight away from the device.
Are there options or additional variants?
No. The SHT 5002 has no options. Float switches, sensors and cables are matching accessories and are ordered separately.
How long is the guarantee valid?
The statutory warranty of at least 2 years in the EU applies. In addition, the manufacturer Schabus offers a 5-year guarantee that can be registered online.
Questions about the water alarm SHT 5002?
Our support team in Germany advises you free of charge on selection, installation and configuration.
Water Detector SHT 5002 – DIN Rail
The SHT 5002 is a professional water detector designed for installation in control cabinets on a 35 mm DIN rail. It features two separate sensor zones (level control and overflow) as well as two potential-free changeover relays, making it suitable for industrial systems, technical rooms, and professional building automation.
Technical Data
- Operating voltage: 230 V AC (±10%) / 50–60 Hz, 12–16 V DC / 0.5 A
- Power consumption: approx. 3 W
- Operating temperature range: 0 °C to +40 °C
- Protection class: IP 20
- Dimensions (H×W×D): 57 × 72 × 90 mm (4 TE DIN rail)
- Mounting: 35 mm DIN EN 50022, rail-mounted device
Sensor & Connections
- Sensor inputs: 2× level control, 2× overflow
- Sensor voltage: 2.5 V AC
- Sensor switching point: RS < 80 kΩ
- Cable: 2 × 0.14 mm², up to 50 m possible
Relays
- Relay 1 (level S1–S2): Changeover contact, max. 5 A / 230 V AC, potential-free
- Relay 2 (overflow S3): Changeover contact, max. 5 A / 230 V AC, potential-free
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
