Panel Indicators, Pilot Lights

Part Number	Description / PDF	Quantity
655-1409-103F Dialight	1/2"FLTSNAP BL230VAC W/LEADS	250
6563309303F Dialight	LED 1/2" DOME YLW 230VAC LEAD	82
6073232330F Dialight	LED 7MM GREEN PMI W GASKET	28
6071112130F Dialight	LED PNL MT 7MM 12V CHROME RED	130
6803332233F Dialight	10MM HO/O PMI-12VDC	3
556150A214F Dialight	1"FLAT RED LED PMI CONST INT	24
6563353303F Dialight	LED PNL IND ORG 12V IP67/NEMA 4X	57
6561357303F Dialight	PANEL IND 72V 1/2" FLT OR W/LEAD	60
6062415110F Dialight	LED PNL IND 6MM R,G 2V RECESS	711
6563108303F Dialight	1/2" DOM RD 37.5VDC W/LEAD	0
5592301003F Dialight	LED PANEL YLW DIFF 2V SNAP 6"LD	890
5590303027F Dialight	LED PMI SNAP-IN YLW PVC FREE	0
5595501027F Dialight	LED PMI SNAP-IN RED PVC FREE	0
6781131111F Dialight	8MM HR/R PMI 2VFTYP W/O RES	324
6792115341F Dialight	9MM HR/R PMI-24VDC W/O-RING	16
6573009803F Dialight	LED IND GREEN RA	0
6211123304F Dialight	22MM FLTPMI RGB 12VDC W/TERM	97
6561204304F Dialight	LED 1/2" FLAT GRN 24VDC TERM	103
6572602103F Dialight	LED 17.46MM GREEN DIFF PANEL MNT	58
6572002303F Dialight	LED 17.46MM WHITE DIFF PANEL MNT	0

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