FCL18-01
Single‑Function Liquid Level Relay | Dual‑Probe Emptying Control | 18mm DIN Rail
Dedicated Dual‑Level Emptying Control in 18mm Width
The FCL18-01 is a specialized liquid level relay designed exclusively for dual‑level emptying control applications. Engineered for reliability in industrial environments, this relay activates the pump when liquid reaches the high level and continues pumping until the low level is reached. Its focused functionality ensures optimal performance in drainage, tank emptying, and wastewater systems.
With a compact 18mm DIN‑rail housing, AC/DC 12‑240V wide supply range, and a robust 16A SPDT output, the FCL18‑01 offers a cost‑effective solution for applications requiring reliable high‑level to low‑level pump‑down control.
Quick Specifications
Why Choose the FCL18-01?
Engineered for reliable dual‑level emptying control in industrial environments.
Dedicated Emptying Control
Single‑function relay optimized for dual‑level pump‑down applications — activates at high level, deactivates at low level.
Adjustable Sensitivity
Fine‑tune the detection threshold (10–100kΩ) to match different probe lengths and liquid conductivity.
16A SPDT Relay
Directly switch pumps, valves, or alarms. Mechanical life up to 10 million cycles.
Simple One‑Button Setup
Single button for sensitivity adjustment. No mode selection or time delay configuration required.
Wide AC/DC Supply
Universal 12–240V AC/DC input – one model works for global installations without modifications.
Dual‑Level Emptying Control
The FCL18-01 operates exclusively in 2‑level control, providing precise control for emptying operations using two level sensors.
Mode F – Dual‑Level Emptying Control
This specialized relay activates the pump when the liquid reaches the high‑level sensor (S1) and continues pumping until the liquid drops below the low‑level sensor (S2). Ideal for applications requiring complete tank emptying with pump protection.
- High‑Level Trigger: Pump activates when liquid reaches or exceeds the HIGH level (S1)
- Continuous Operation: Pump remains active while liquid level is above LOW level (S2)
- Low‑Level Shutoff: Pump deactivates when liquid drops to or below LOW level (S2)
- Built‑in Protection: Prevents pump dry‑running and ensures complete tank emptying
Technical Specifications
| Parameter | Specification |
|---|---|
| Supply Voltage | AC/DC 12‑240V (-15% / +10%) |
| Power Consumption | AC 3.5VA / DC 2.0W |
| Supply Indication | Green LED (Un) |
| Relay Indication | Red LED (R) |
| Control Mode | Empty Liquid with 2 Levels (fixed) |
| Probe Configuration | 2 probes only (S1, S2, C) |
| Sensitivity Setting | 10kΩ – 100kΩ (adjustable via button) |
| Output Contact | 1 × SPDT (NO+NC) |
| Rated Current | 16A / 250V AC |
| Mechanical Life | 1 × 10⁷ operations |
| Electrical Life | 1 × 10⁵ operations |
| Ambient Temperature | -20°C … +60°C |
| Storage Temperature | -40°C … +85°C |
| Mounting | DIN rail EN/IEC 60715 (35mm) |
| Dimensions (H×W×D) | 90 × 18 × 64 mm |
| Weight | 68g |
| IP Rating | IP20 |
| Standards | GB/T 14048.5, IEC 60947‑5‑1, EN 61812‑1 |
Terminal Connections
FCL18-01 – Dual‑Level Emptying Control Wiring
- De‑energize the panel before wiring.
- Verify supply voltage matches AC/DC 12‑240V rating.
- Connect the load (pump/valve) between terminal 11 and 14 (NO) for normal operation.
- For dual‑probe emptying control, connect probes to S1 (high), S2 (low), and C (common).
- Use correct wire gauge for 16A load (min 1.5mm²).
- Tighten screws to 0.4 N·m; stripping length 7mm (AWG13‑20).
Front Panel & Settings
Configure sensitivity using the front‑panel button – no mode selection or time delay required.
Un – Green LED
Lit = power supply applied
R – Red LED
Lit = relay output active (NO closed, pump running)
How to Adjust Sensitivity
- Enter setting mode: Press and hold the Sensitivity button until the green LED starts flashing.
- Adjust sensitivity: Continue pressing the button to cycle through sensitivity levels (10kΩ, 20kΩ, 50kΩ, 100kΩ). The red LED blinks to indicate the selected level.
- Confirm & exit: Press and hold the button again until the green LED stops flashing. The setting is saved.
Note: The FCL18-01 has a fixed emptying control mode. No function selection or time delay adjustment is available – simply set the sensitivity and the relay is ready for operation.
Model Comparison
| Model | Function | Probe Poles | Modes | Sensitivity | Delay |
|---|---|---|---|---|---|
| FCL18-01 | Single‑function emptying control | 2 poles only | 1 (Emptying) | Adjustable 10‑100kΩ | Not available |
| FCL18-02 | Multifunction level relay | 1 or 2 poles | 6 (A‑F) | Adjustable 10‑100kΩ | 0.1‑20s |
Product Video
Typical Applications
Wastewater Systems
Control pumps in sewage treatment and drainage systems.
Industrial Tanks
Empty chemical storage and processing tanks.
Fuel Storage
Control fuel transfer between storage tanks.
Chemical Processing
Precise emptying of reaction vessels.
Ready to Order or Need More Details?
Download the datasheet or contact FIICCO for pricing, samples, and OEM options.
Frequently Asked Questions
FCL18-01 is a single‑function relay dedicated to dual‑probe emptying control with adjustable sensitivity only. FCL18-02 is a multifunction relay with 6 selectable modes (A–F), adjustable sensitivity, and adjustable time delay.
Connect the common reference electrode to terminal C. Connect the high‑level probe to S1 (pump starts when liquid reaches this point) and the low‑level probe to S2 (pump stops when liquid drops below this point). For dual‑probe emptying control, all three probes are required.
The FCL18-01 accepts AC/DC 12–240V (‑15% / +10%). One model works for 12V, 24V, 110V, 230V AC or DC systems.
No. The FCL18-01 is a simplified single‑function relay with only sensitivity adjustment. For applications requiring time delay, please use the FCL18-02 multifunction model.
The SPDT output relay is rated 16A at 250V AC (resistive load), suitable for direct control of pumps, contactors, and valves.
Yes. We provide custom branding, model numbering, packaging, and tailored specifications for volume orders. Contact us for details.