Panel Indicators, Pilot Lights

Part Number	Description / PDF	Quantity
6561209304F Dialight	LED 1/2" FLAT GRN 230VAC TERM	32
6561306303F Dialight	LED 1/2" FLAT YLW 28VDC LEAD	34
6571604303F Dialight	LED 17.46MM GREEN DIFF PANEL MNT	0
5561703304F Dialight	LED PNL MT 1" 12V WT FLAT YLW	0
5571805203F Dialight	LED PNL MT 11/16" 24V WT BLUE	1
6071312120F Dialight	LED PNL MT 7MM 6V CHROME YEL	150
5561805304F Dialight	LED PNL MT 1" 125VAC WT FLAT BLU	0
5590303023F Dialight	LED PMI SNAP-IN YLW PVC FREE	734
5591101007F Dialight	LED PANEL RED DIFF SNAP-IN 14"LD	548
6563356204F Dialight	PANEL IND 28V 1/2" DOM OR W/TERM	0
6563206304F Dialight	LED 1/2" DOME GRN 28VDC TERM	0
6092122140F Dialight	LED PNL MT 9MM 24V BLACK RED	1711825
5595301007F Dialight	LED SNAP-IN PANEL 5MM 3V YELLOW	1391
6563206303F Dialight	LED 1/2" DOME GRN 28VDC LEAD	20
6761211110F Dialight	LED PANEL INDCATOR GREEN 3.3V	0
5563705304F Dialight	LED PNL MT 1" 125V YEL DOME PMI	27
5580803027F Dialight	LED PMI SNAP-IN BLUE PVC FREE	0
6773335333F Dialight	7MM HO/O PMI-12VDC W/O-RING	250
6071212330F Dialight	LED 7MM GREEN PMI W GASKET	362
6091122140F Dialight	LED PNL MT 9MM 24V BLACK RED	150

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