MF-LD-230AC Festo Illuminating seal

Technical Overview

The Festo MF-LD-230AC is a high-performance illuminating seal designed for industrial solenoid valve applications. Featuring an integrated LED switching position indicator, this seal provides immediate visual feedback of the valve status. It is designed for type B square design MSF electrical connections and operates at a nominal voltage of 230 V AC. Constructed from transparent TPE-U(PU), the seal offers IP65 protection and robust immunity to surges up to 4 kV, making it suitable for demanding automation environments.

Key Features

Integrated LED switching position indicator
Type B square design (MSF) electrical connection
IP65 degree of protection against dust and water
Protective conductor connection available
Mounting via M3 central screw for secure attachment
Transparent TPE-U(PU) housing for clear visibility

Technical Specification Matrix

Parameter	Value
Switching position indicator	LED
Type of mounting	On solenoid valve via M3 central screw
Product weight	1.6 g
Electrical connection	Type B Square design MSF
Nominal operating voltage AC	230 V
Immunity to surge	4 kV
Protective conductor connection	Available
Nominal power illuminating seal	0.33 W
Permissible voltage fluctuations	+/- 10 %
Degree of protection	IP65
Ambient temperature	-25 °C ... 85 °C
CE mark (see declaration of conformity)	To EU Low Voltage Directive
UKCA marking (see declaration of conformity)	To UK regulations for electrical equipment
LABS (PWIS) conformity	VDMA24364-B2-L
Pollution degree	3
Material housing	TPE-U(PU)
Colour	Transparent

Industrial Applications

1. Visual Diagnostics in Automotive Paint Spray Booths

Utilizing the transparent illuminating seal on pneumatic solenoid valves controlling automated paint spray guns and robotics to provide instant visual feedback of valve actuation.

Problem Solved

Eliminates the need for manual multimeter testing to check 230V AC coil status, drastically reducing diagnostic downtime. The critical LABS (PWIS) conformity ensures no silicone or paint-wetting impairment substances are introduced into the booth, preventing costly paint finish defects.

LABS (PWIS) VDMA24364-B2-LLED Switching position indicator230 V AC Nominal operating voltageTransparent Colour

2. Solenoid Status Verification in Industrial Packaging Machinery

Integrated between the coil and Type B electrical plug of pneumatic actuators in high-speed corrugated cardboard folding and gluing machines.

Problem Solved

Provides reliable visual confirmation of valve firing sequences in electrically noisy environments. The 4 kV surge immunity protects the LED from transient voltage spikes caused by large induction motors, while the M3 central screw ensures secure mounting despite intense machine vibration.

Type B Square design MSF4 kV Immunity to surgeOn solenoid valve via M3 central screw0.33 W Nominal power illuminating seal

3. Valve Actuation Monitoring in Wastewater Treatment Automation

Deployed on 230V AC pilot solenoid valves operating main fluid control gates in outdoor or semi-outdoor wastewater and effluent treatment facilities.

Problem Solved

Enables operators to visually verify process sequences in harsh, damp, and thermally fluctuating environments without opening sealed panels. The IP65 rating and Pollution degree 3 certification ensure resilience against moisture and industrial contaminants, operating reliably across extreme ambient temperatures.

-25 °C ... 85 °C Ambient temperatureIP65 Degree of protectionPollution degree 3TPE-U(PU) Material housing