GRL8-03 Liquid Level Control Relay

The GEYA GRL8-03 liquid level control relay is a specialized device engineered for precise water level management in applications such as water towers, wells, and storage tanks. This compact, DIN-rail mountable relay ensures a consistent water supply by automatically controlling water pumps based on real-time level data. Whether you’re managing an industrial facility or a residential water system, the GRL8-03 offers advanced features like adjustable sensitivity, galvanically separated supply voltage, and pump protection to deliver reliable performance and operational efficiency.

Voltage Range: AC/DC 24V-240V, 50/60Hz
Supply Voltage Tolerance: ±10%
Sensitivity (Input Resistance): Adjustable, 5kΩ to 100kΩ
Voltage in Electrodes: Max AC 1V
Current in Probe: AC <1mA

→ Download GRL8-03 Liquid Level Control Relay Catalog PDF

Category Monitoring Relay

Description

Product Highlight

Automated Water Level Control: Maintains optimal water levels by starting and stopping the pump based on preset minimum and maximum thresholds.

Pump Protection: Adjustable sensitivity (5kΩ to 100kΩ) prevents dry-running by detecting low water levels, extending pump lifespan.

Manual Start Option: External start button provides flexibility for manual pump operation when needed.

Wide Voltage Compatibility: Galvanically separated supply voltage (AC/DC 24V-240V) ensures safe and versatile operation.

Real-Time Monitoring: Green and red LED indicators offer clear feedback on relay status and water shortage alerts.

Space-Saving Design: Compact dimensions (18mm W x 64mm D x 90mm H) and DIN-rail mounting make installation a breeze.

Functions Diagram:

Wiring Diagram:

Panel Diagram：

Dimensions（mm）：

Model	GRL8-03
Function	well-tank level contorl
Supply terminals	A1,A2
Voltage range	AC/DC 24-240V(50-60Hz)
Input	max .2VA
Supply voltage tolerance	-15%;+10%
Sensitivity(input resistance）	adjustable in range 5 kΩ -100 kΩ
Voltage in electrodes	max. AC 5 V
Current in probe	AC <0.1 mA
Time response	max. 400 ms
Max. capacity length	800 m (sensitivity 25kΩ), 200 m (sensitivity 100 kΩ)
Max. capacity of probe cable	400 nF (sensitivity 25kΩ), 100 nF (sensitivity 100 kΩ)
Supply indication	Green LED
Accuracy in setting(mechanical)	≤10 %
Output	1xSPDT
Current rating	10A/AC1
Switching voltage	250VAC/24VDC
Min. breaking capacity DC	500mW
Output indication	Red LED
Mechanical life	1*10⁷
Electrical life(AC1)	1*10⁵
Reset time	max.200ms
Operating temperature	-20℃ to +55℃（-4℉ to 131℉）
Storage temperature	-35℃ to +75℃（-22℉ to 158℉）
Mounting/DIN rail	Din rail EN/IEC 60715
Protection degree	IP20 terminals
Operating position	any
Overvoltage category	III
Pollution degree	2
Max. cable size(mm²)	solid wire max.1×2.5or 2×1.5/with sleeve max.1×2.5(AWG 12)
Dimensions	90x 18x 64mm
Weight	80g
Standards	EN 60255-1