Automatic Water Level Relay with 3 Probes – Effortless Pump Control
Tired of overflowing tanks or pumps running dry because you forgot to switch them off? This automatic water level relay is the perfect solution. It intelligently manages your pump by starting and stopping it based on the water levels detected by the probes, removing the need for constant manual supervision.
Note: The package includes the control relay and 3 level probes (5m each). The water pump is not included.
Why choose this model? (Key Advantages):
- 3 x 5m probes included — Ready for immediate installation in deep tanks or medium-sized basins without extra costs.
- 20A / 220V resistive relay output — Handles high-capacity pumps without the risk of overloading.
- 3 modes: AUTO / ON / OFF — Switch to manual mode in seconds without needing to rewire.
- 4 preconfigured scenarios — Filling, draining, minimum level maintenance, or transfer between two tanks, with clear connection guides.
- Colour-coded wiring (red, blue, black, green, yellow) — Easily identify each probe at a glance, virtually eliminating connection errors.
- Compact 86×66×49 mm housing — Fits easily into any standard electrical cabinet or junction box.
Details and Performance
Level detection is achieved through electrical conductivity. When the stainless steel probes make contact with the water, the circuit closes, triggering or cutting the relay automatically. The unit supports 20A for resistive loads and 10A for inductive loads (motors, pumps), making it compatible with most domestic and semi-industrial submersible or surface pumps. The three-position selector gives you immediate control, allowing you to manually override the system whenever necessary.
| Parameter | Value / Detail |
|---|---|
| Rated Voltage | 220V AC |
| Relay Output – Resistive Load | 20A / 220V |
| Relay Output – Inductive Load | 10A / 220V |
| Number of Probes Included | 3 probes |
| Probe Length | 5 metres each |
| Operating Modes | ON / OFF / AUTO |
| Housing Dimensions | 86 × 66 × 49 mm |
| Compatible Applications | Tanks, basins, swimming pools, aquariums |
Programming and Usage Instructions
- Automatic Tank Filling (Figure 1): Connect probe A (red) to the high level (stops pump when full); probe B (blue) to the low level (starts pump when low); probe C (black) as the common bottom line. Probes D (green) and E (yellow) are connected together with C.
- Automatic Tank Draining (Figure 2): Probe E at the high level starts the pump; probe D at the low level stops the pump; C remains the common line. Probes A and B remain disconnected.
- Minimum Level Maintenance (Figure 3): Connect C and D as control points for the low level; create a short bridge between E and C. Probes A and B remain disconnected. The pump stops automatically when the level drops below the minimum threshold.
- Automatic Transfer Between Two Tanks (Figure 4): Probe A at the top level of the upper tank (stops pump); probe B at the low level of the upper tank (starts pump); C as the common line for both tanks; probe D at the low level of the lower tank (stops pump); probe E at the high level of the lower tank (starts pump). If high-level activation in the lower tank is not required, probe E can be disconnected.
- Set the selector to AUTO for continuous automatic operation or ON/OFF for immediate manual intervention.
Package Contents
- 1× Automatic water level control relay 220V
- 3× Stainless steel level probes (5 m each)
Frequently Asked Questions
Is it compatible with any type of submersible pump?
Yes, it works with 220V AC submersible and surface pumps, provided the current draw does not exceed 20A (resistive) or 10A (inductive). Please check your pump’s technical specifications before installation.
Can I use the probes in saltwater or chlorinated water (pools)?
Yes. The probes are corrosion-resistant and suitable for chlorinated or saltwater in standard concentrations. In highly aggressive chemical environments, inspect them periodically and replace them if signs of wear appear.
Can I extend the probes beyond 5 metres?
Yes, using appropriate electrical cable and waterproof connectors. For distances over 20m, use shielded cable to reduce electrical interference that could cause false triggering.
What happens after a power cut?
When power is restored, the relay resumes operation based on the selector position and the current water level. There is no internal state memory; the pump reacts directly to the conditions at that moment.
Can it control transfer between two tanks simultaneously?
Yes. Using the scenario in Figure 4, the relay monitors the levels in both tanks using the 3 included probes and automatically manages the water transfer between them.
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