Water level control relay for a single tank with heating element protection – Tense SSR-09

Product description

The SSR-09 relay from Tense is a modern unit designed for automatic water level control in boilers, tanks, and water heaters.
It ensures reliable water refilling, timely pump shutdown, and above all effective protection of the electric heating element from dry running.

The device uses capacitive electrodes to monitor the water level and automatically controls the pump and heater according to the current situation in the tank.

Key advantages

• Dry run protection for the boiler and heating element – extends the device's lifespan.

• Automatic water level control: the pump turns on at low level and off when the upper level is reached.

• Heater protection – if there is no water at the heating element, the device immediately blocks its power supply.

• LED operation indication for pump and heating for easy status check.

• Easy installation – mounting on DIN rail, clear screw terminals.

• Compact dimensions, low power consumption.

• Wide operating voltage range 170–260 VAC – stable operation even with network fluctuations.

Operating principle

SSR-09 operates with two electrodes placed in the tank:

1. Lower electrode (min. level)

   • If the water level falls below this electrode, the relay activates the pump and starts refilling water.

2. Upper electrode (max. level)

   • When the upper level is reached, the relay automatically switches off the pump.

3. Protective electrode at the heating element

   • If there is no water at the heating element, the relay cuts off power to the heater and prevents overheating.

This intelligent logic ensures safe and economical operation of the entire system.

Usage

• Electric boilers and storage water heaters

• Heating systems with accumulation tanks

• Domestic and industrial water tanks

• Water supply and pumping systems

• Tanks for drinking or utility water

Installation and connection

• Mounting on a standard DIN rail in the distribution cabinet.

• Connection using screw terminals.

• Electrodes must be installed in the tank at the desired levels.

• For stable operation, the manufacturer recommends using conductors of min. 2.5 mm².

Note: Electrodes (level probes) are not included in the package and must be ordered separately.