Panel Indicators, Pilot Lights

Part Number	Description / PDF	Quantity
6563409304F Dialight	LED 1/2" DOME BLUE 230VAC TERM	0
5591201003F Dialight	LED PANEL YLW DIFF 1.9V SNAP 6"L	66
6772312323F Dialight	7MM HO/O PMI-6VDC W/O-RING	56
5563604324F Dialight	LED 1" DOME GRN PMI 24V C1D2	61
6561358303F Dialight	LED PNL IND OR 37.5V IP67/NEMA4X	69
5590202023F Dialight	LED PMI SNAP-IN GRN PVC FREE	188
6561206304F Dialight	LED 1/2" FLAT GRN 28VDC TERM	70
6201401304F Dialight	8MM FLT PMI BLUE 3VDC W/TERMS	205
5571605203F Dialight	LED PNL MT 11/16" 24V WT GREEN	246
6091222140F Dialight	LED PNL MT 9MM 24V BLACK GREEN	273
6563202304F Dialight	1/2" DOM GN 5VDC W/TERM	99
6792325343F Dialight	LED PANEL INDCATOR ORANGE 24V	88250
5581101001F Dialight	LED PANEL IND RED DIFF SNAP-IN	425
6563356203F Dialight	PANEL IND 28V 1/2" DOM OR W/LEAD	69
6552303103F Dialight	LED PANEL INDICATOR YELLOW 12V	594
5593001007F Dialight	LED PANEL RED/GRN SNAP-IN 14"LD	2956
6092212330F Dialight	LED 9MM GREEN PMI W GASKET	0
6303504304F Dialight	30MM DOM RD 24VDC W/TERM	20
5581601001F Dialight	LED PANEL IND YLW TINTED SNAP-IN	0
6561202304F Dialight	1/2" FLT GN 5VDC W/TERM	99

Panel Indicators, Pilot Lights

1. Overview

Panel indicators and pilot lights are optoelectronic devices that provide visual status feedback in electrical and electronic systems. These components convert electrical signals into light outputs, enabling operators to monitor equipment conditions at a glance. Their importance spans across industrial automation, consumer electronics, transportation, and medical devices, where reliable visual indication ensures operational safety, efficiency, and user interaction.

2. Major Types and Functional Classification

Type	Functional Features	Application Examples
LED Panel Indicators	Low power consumption, long lifespan, instant response	Industrial control panels, HVAC systems
Lamp-based Pilot Lights	High brightness, compatibility with AC/DC circuits	Machinery status indication, heavy-duty equipment
Combined Indicator/Switch	Integrated illumination with manual control	Emergency stop circuits, control desks
Multi-color Indicators	Programmable color outputs for status differentiation	Network routers, medical diagnostic equipment
Remote Indicators	Separate light source and panel module	Automotive dashboards, aerospace control systems

3. Structure and Components

Typical construction includes:

Light Source: LED chips or filament bulbs with specific color/wavelength
Housing: Thermoplastic or metal body with mounting threads (e.g., M20, NPT)
Optical System: Diffused or focused lens for uniform light distribution
Electrical Interface: Screw terminals, PCB pins, or quick-connect terminals
Sealing Elements: Rubber gaskets for IP65+ protection ratings

4. Key Technical Specifications

Parameter	Significance
Operating Voltage Range	Determines compatibility with control circuits (3-480V AC/DC)
Luminous Intensity (cd)	Affects visibility in different lighting conditions
Color Wavelength (nm)	Standardizes visual coding (e.g., 630nm red for warnings)
MTBF (Hours)	Indicates reliability (LED: 50,000-100,000 hours)
IP Rating	Defines environmental protection level
Response Time (ms)	Critical for real-time status monitoring

5. Application Areas

Industrial: CNC machines, PLC control cabinets, factory automation
Transportation: Locomotive control panels, aircraft avionics
Medical: Patient monitors, imaging equipment status indicators
Consumer: Home appliance power indicators, audio equipment
Energy: Solar inverters, smart grid monitoring systems

6. Leading Manufacturers and Products

Manufacturer	Representative Product	Key Features
Phoenix Contact	ILLINOX series	Modular design, IP69K rating
Omron	XLDC12E-4AH	Ultra-compact LED indicator with 100,000-hour lifespan
Siemens	8WA1000 series	Multi-voltage capability (24-415V AC/DC)
Eaton	Pilot Lights H45K	Shock-resistant filament lamps for heavy-duty use
TE Connectivity	CapLED	Capacitive touch-enabled indicator

7. Selection Recommendations

Key considerations:

Environmental factors: Temperature range (-40 C to +85 C), vibration levels
Electrical compatibility: Voltage matching and circuit type (AC/DC)
Visibility requirements: Ambient light conditions and viewing distance
Certification needs: UL, CE, RoHS compliance for regulatory environments
Mechanical specifications: Panel cutout size (commonly 16/22/30mm)

Example: Selecting an IP67-rated LED indicator with 24V DC operation for a food processing plant's washdown area.

Industry Trends

Emerging developments include:

Integration with IoT systems for smart status monitoring
Miniaturization for high-density panel designs
RGB-LED technology for dynamic color coding
Energy harvesting indicators for self-powered operation
Enhanced durability coatings for extreme environments