Panel Indicators, Pilot Lights

Part Number	Description / PDF	Quantity
655-1205-103F Dialight	1/2"FLTSNAP GN120VAC W/LEADS	250
5595101001F Dialight	LED PANEL RED DIFF SNAP-IN STR	52
5581101027F Dialight	LED PMI SNAP-IN RED PVC FREE	223
6561309303F Dialight	LED 1/2" FLAT YLW 230VAC LEAD	51
5563708304F Dialight	LED PANEL MT 1" WT DOME YELLOW	0
6783431114F Dialight	8MM HB/B PMI 3.3VFTYP W/ORES	92
6792425344F Dialight	9MM HB/B PMI-24VDC W/O-RING	88
5590203007F Dialight	LED SNAP-IN PANEL 5MM 12V GREEN	3868
6083331110F Dialight	LED PNL IND 8MM YLW LOCKWASH/NUT	509
6561322304F Dialight	1/2" FLT Y/G 5VDC W/TERM	52
5561709304F Dialight	LED PNL MT 1" 230VAC WT FLAT YLW	0
5563704304F Dialight	LED PNL MT 1" 24V WT DOME YEL	0
6561107304F Dialight	1/2" FLT RD 72VDC W/TERM	81
6781335233F Dialight	8MM HO/O PMI-12VDC	63
6571704303F Dialight	LED 17.46MM YELLOW DIFF PNL MNT	15
5593001003F Dialight	LED PANEL RED/GRN SNAP-IN 6"LD	164
5561609324F Dialight	LED 1" FLAT GREEN 230V C1D2	8
6092222140F Dialight	LED PNL MT 9MM 24V BLACK GREEN	58
655-1305-103F Dialight	1/2"FLTSNAP YL120VAC W/LEADS	250
5561905304F Dialight	LED PNL MT 1" 24V FLAT ORANGE	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