Description
Flexible Non-Intrusive Level Detection for Liquid Tanks
The FLD-32 Flexi Watch Thru-Wall Level Sensor is a compact and innovative device designed for limit level sensing of liquids in non-conductive tanks and pipelines. This sensor operates through the wall of glass or plastic vessels, allowing accurate detection of liquid presence without direct contact with the medium.
Because the sensor works externally, it eliminates the need to drill holes or install probes inside the tank. This non-invasive design reduces the risk of leaks, contamination, and mechanical damage, making it ideal for modern industrial and laboratory installations.
High-Frequency Sensing Technology for Reliable Operation
The FLD-32 uses advanced high-frequency sensing technology to detect liquids through non-conductive walls. This technology ensures reliable operation even when the liquid creates conductive deposits or adheres to the inner wall of the vessel.
The sensor can detect both conductive and non-conductive liquids, providing versatility across many industrial applications. It works effectively with liquids stored in glass or plastic containers, pipelines, and gauge tubes.
Flexible Housing for Curved Surfaces
One of the key features of the FLD-32 “Flexi Watch” is its flexible polyurethane housing. The sensor can easily adapt to slightly curved surfaces, making it suitable for installation on cylindrical tanks, pipes, and vessels.
This flexibility allows the sensor to maintain consistent contact with the tank wall, ensuring reliable detection and accurate switching performance.
Quick Installation with Adhesive or Fastening Bands
The sensor is designed for fast and convenient installation. It includes a self-adhesive mounting layer that allows the device to be attached directly to the tank surface. For additional security, the housing also includes holes that allow installation using special fastening bands.
This flexible mounting method makes the sensor easy to install in new or existing systems without complex modifications.
Easy Configuration and Visual Status Indication
The FLD-32 supports simple configuration using a programming wire or magnetic pen, depending on the model version. This allows users to easily adjust sensitivity and switching modes to match the specific application.
An integrated LED indicator clearly shows the operating status of the sensor, enabling operators to quickly confirm whether the device detects liquid presence.
Compact and Lightweight Industrial Design
The sensor features a lightweight polyurethane housing that ensures durability while keeping the device extremely compact. Its minimal weight and small dimensions make it ideal for installations where space is limited.
With reliable sensing performance and simple installation, the FLD-32 provides an efficient solution for external liquid level detection.
Product Name: Thru-Wall Level Sensor FLD-32 “Flexi Watch”
Application: Limit level sensing of liquids through non-conductive vessel walls
Supply Voltage: 6 – 30 V DC
Current Consumption (Idle): Max. 0.6 mA
Switched Current: 3.3 – 40 mA
Voltage Drop (Closed State): Max. 6 V
Maximum Switching Frequency: 1 Hz
Ambient Temperature Range: −20 °C to +70 °C
Minimum Vessel Diameter for Installation: 300 mm
Maximum Vessel Wall Thickness:
-
Conductive liquids: 8 mm
-
Non-conductive liquids (εr < 10): 3 mm
Protection Class: IP67
Housing Material: Polyurethane (flexible)
Connection Cable Type: PUR 3 × 0.14 mm²
Weight:
-
Approx. 40 g (including 2 m cable)
-
10 g (without cable)





