Relay for controlling the liquid level in a vessel, 3 sensors

Reletek RS-LC Series are microcontroller-based liquid level control relays designed for automatic filling or draining control of tanks, reservoirs and wells. The devices operate with conductive probes (electrodes) and provide reliable level monitoring through adjustable sensitivity and time delay settings. The RS-LC series is suitable for industrial, commercial and residential applications where stable and accurate liquid level control is required.

Main advantages:

Microcontroller-based control
Adjustable sensitivity from 5kΩ to 100kΩ
1 C/O output contact
Operation with 2 or 3 electrodes
Selectable filling or draining function
LED indication for supply and output status
Wide AC / DC supply voltage range 24–240 V
DIN-rail mounting, 1 module width

Technical specifications:
Series RS-LC
Supply terminals A1 – A2
Rated supply voltage AC / DC 24 ~ 240 V
Frequency 50 / 60 Hz
Power consumption < 1 W
Sensitivity 5 kΩ ~ 100 kΩ adjustable
Trip delay RS-LC1: 2 s; RS-LC2 / RS-LC3: 0.5 ~ 10 s
Supply indication Green LED
Output indication Red LED
Output contact 1 × C/O
Contact rating 16 A / 250 V AC (AC1)
Rated insulation voltage 415 V
Protection degree IP20
Pollution degree 3
Electrical life 105
Mechanical life 106
Altitude ≤ 2000 m
Operating temperature -20°C ~ +55°C
Permissible humidity ≤ 50% at 40°C (non-condensing)
Storage temperature -30°C ~ +70°C
Conductor size 0.5 ~ 2.5 mm²
Tightening torque 0.5 Nm
Mounting DIN rail TH35 (EN60715)