Product Overview

The VIOX FCL18-01/02 liquid level control relay is an advanced monitoring solution designed for precise liquid level detection in industrial settings. Engineered to provide reliable monitoring for overliquid or underliquid conditions, this DIN rail-mounted relay offers exceptional versatility with multiple control functions and a wide operating voltage range.

Available in two models—FCL18-01 (dedicated 2-level control) and FCL18-02 (configurable 1 or 2-level control)—these relays deliver dependable liquid level monitoring across diverse industrial applications, from water tanks to chemical reservoirs and processing equipment.

Key Features and Benefits

Versatile monitoring capabilities: Monitor for both overliquid and underliquid conditions with precision
Broad power compatibility: Wide power supply range from 12 to 240 VAC/DC ensures compatibility with various electrical systems
User-friendly setup: Easy configuration with wiring diagrams clearly visible on the side of the product
Industrial-grade performance: Strong anti-interference capability for reliable operation in electrically noisy environments
Multiple control functions: Choose from various liquid level control functions (A through F) for precise application matching
Adjustable sensitivity: Fine-tune detection parameters to suit different liquid types and environments
Visual status indicators: Green LED for power supply status and red LED for relay activation state
Configurable time settings: Adjustable time ranges from 0.1s to 10s for customized response
Robust industrial design: IP20 protection rating with operating temperature range from -20°C to +85°C

Model Comparison: FCL18-01 vs. FCL18-02

VIOX FCL18-01_02 Liquid Level Control Relay front

Feature	FCL18-01	FCL18-02
Control Level Options	2-level control only	1 or 2-level control (selectable)
Control Functions	2-level control, Empty liquid	Multiple functions (A through F)
Terminal Configuration	A1-A2, 14-11-12, S1-S2-C	A1-A2, 14-11-12, S1-C (1-level) or S1-S2-C (2-level)

Technical Specifications

Specification		Details
Input Terminal		A1-A2
Voltage Range		AC 230V / DC24V / AC/DC 12-240V
Power Consumption		AC 3.5VA/ DC 2.0W
Voltage Tolerance		-15% ~ +10%
Supply Indication		Green LED
Relay Indication		Red LED
Time Ranges		0.1s – 10s
Setting Method		Button
Setting Deviation		0.1%
Temperature Coefficient		0.05%/°C, at=20°C (0.05%/°F, =68°F)
Output Contact		1*SPDT
Rated Current		1*16A
Mechanical Life		1*10⁷
Electrical Life		1*10⁵
Ambient Temperature		-20 … +60 °C / -40 … +85 °C
Mounting		DIN rail EN/IEC 60715
IP Rating		IP20
Stripping Length		7mm (0.28in)
Installed Altitude		≤2200m
Pollution Level		2
Max Cable Size		AWG13-20 0.4N·m
Dimensions		90mm18mm64mm
Weight		About 90g
Standards		GB/T 14048.5, IEC60947-5-1, EN68121-1

Control Functions Overview

The FCL18-02 offers multiple operational modes to adapt to various liquid level control requirements:

VIOX FCL18-01_02 Liquid Level Control Relay control function principles

Function A (2-level control, Fill liquid)

Provides dual-level monitoring for filling applications. The relay activates when liquid level falls below the minimum threshold and deactivates once it reaches the maximum level, ensuring precise fill control.

Function B (1-level control, Fill liquid)

Single-level monitoring for filling operations. The relay operates based on a single sensor point with adjustable time delay (Tt) for smooth operation.

Function C (1-level control, Fill liquid)

Alternative single-level fill monitoring with different timing characteristics, offering flexibility for various process requirements.

Function D (1-level control, Empty liquid)

Single-level monitoring optimized for emptying operations. The relay activates when liquid exceeds the minimum threshold and deactivates when it falls below, with adjustable time delay (Tt).

Function E (1-level control, Empty liquid)

Alternative single-level emptying control with different timing characteristics for specialized applications.

Function F (2-level control, Empty liquid)

Dual-level monitoring for emptying applications. The relay activates when liquid level exceeds the maximum threshold and deactivates once it falls below the minimum level, ensuring precise empty control.

Wiring Instructions

VIOX FCL18-01_02 Liquid Level Control Relay control wiring

2-level Control Configuration

For dual-level monitoring applications:

Connect power supply to terminals A1-A2
Output relay contacts available at terminals 14-11-12
Connect level probes to terminals S1-S2-C, with C being the common connection point

1-level Control Configuration

For single-level monitoring applications:

Connect power supply to terminals A1-A2
Output relay contacts available at terminals 14-11-12
Connect level probe to terminals S1-C, with C being the common connection point

Accessories Information

The FCL-PB liquid level probe is required for proper operation but is not included with the main unit. It must be purchased separately. The probe cables are available in three standard lengths:

1.5 meters in red
2.5 meters in white
3.5 meters in blue

VIOX FCL18-01_02 Liquid Level Control Relay control accessories

Installation Guidelines

For optimal performance and reliability, follow these installation recommendations:

Mounting: Install the relay on a standard 35mm DIN rail in a control panel or enclosure
Environmental considerations: Place in locations with ambient temperatures between -20°C and +60°C for optimal performance
Electrical connections: Use AWG13-20 wire size with proper stripping length of 7mm
Probe positioning: Install probes at desired monitoring levels, ensuring proper submersion in the liquid to be monitored
Voltage selection: Ensure proper supply voltage (from 12 to 240 VAC/DC) is connected to terminals A1-A2
Function selection: Choose the appropriate function (A-F) based on your specific application requirements

Applications

The FCL18-01/02 liquid level control relay is ideal for a wide range of industrial applications, including:

Water management: Municipal water supply, water treatment plants, irrigation systems
Industrial processes: Chemical processing, manufacturing facilities, production lines
Storage tanks: Fuel storage, chemical reservoirs, water tanks
Building systems: Water supply management, HVAC applications, basement flood protection
Agricultural settings: Irrigation systems, livestock water supply
Waste management: Sewage control, effluent monitoring

Configuration and Adjustment

The FCL18-01/02 features intuitive controls for easy setup and adjustment:

Sensitivity adjustment: Rotary dial with settings from 5-100 kOhm allows fine-tuning for different liquid conductivity levels
Function selection: Choose between operational modes (Functions A-F) to match your specific application needs
Time delay adjustment: Set time delay (Tt) from 0.1s to 10s to prevent false triggers from wave action or momentary level changes

Ordering Information

The FCL18 series follows a simple model numbering system:

FCL18-XX-Y

XX: Model type (01 for 2-level control only, 02 for 1 or 2-level control)
Y: Supply voltage (A for AC230V, D for DC24V, W for AC/DC12-240V)

Example: FCL18-02-W is the configurable model with 1 or 2-level control capability and wide-range AC/DC12-240V power supply.

Compliance and Certification

The FCL18-01/02 meets international standards for safety and performance:

GB/T 14048.5
IEC60947-5-1
EN68121-1

Conclusion

The VIOX FCL18-01/02 liquid level control relay offers industrial-grade performance in a compact, easy-to-install package. With its versatile control functions, wide operating voltage range, and robust design, it provides reliable liquid level monitoring across diverse applications. Whether you need simple single-level detection or more complex dual-level control, the FCL18 series delivers dependable operation and straightforward setup, making it the ideal choice for industrial liquid monitoring needs.

For more information about the FCL18-01/02 liquid level control relay or to discuss your specific application requirements, please contact our technical support team.

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