.

Internal and external filters

Applicable Standards

Both filter types adhere to industry-specific regulations, including:

  • ISO 10526(Standard illuminants for colorimetry, e.g., D65, A light sources)
  • ASTM E1164(Practice for obtaining spectrophotometric data for object-color evaluation)
  • MIL-STD-810G(Environmental engineering considerations for military equipment, including filtration)
  • IEC 60529(IP ratings for dust/water resistance in external air filters)
  • NSF/ANSI 42 & 53(Standards for drinking water treatment filters)

Working Principle

  • Internal Filters:
    • Operate viainterference, absorption, or diffractionto modify light spectra.
    • Example: A UV-cut filter in a camera blocks ultraviolet wavelengths to improve color accuracy.
  • External Filters:
    • Usemechanical, electrostatic, or chemical mediato trap particles/contaminants.
    • Example: A HEPA filter in an HVAC system captures 99.97% of 0.3 µm particles.

Test Principle & Applications

  • Optical Testing (Internal Filters):
    • Spectral Transmittance: Measured via spectrometers (e.g., ISO 13655).
    • Applications: Color calibration, fluorescence microscopy, solar simulation.
  • Environmental Testing (External Filters):
    • Particle Retention Efficiency: Tested per ASHRAE 52.2 (air filters) or NSF protocols (water filters).
    • Applications: Cleanrooms, medical facilities, industrial emissions control.

Key Considerations:

  • Internal Filters: Require precision alignment and material durability (e.g., fused silica, coated glass).
  • External Filters: Must balance efficiency with airflow/flow rate (e.g., MERV ratings for HVAC).

Both internal and external filters play pivotal roles in optimizing system performance, ensuring compliance with regulatory standards, and enhancing product reliability across industries.

Main Parameters

ParameterInternal FiltersExternal Filters
Application Optical instruments, cameras, displays HVAC systems, water treatment, light sources
Mounting Integrated into device housing Removable cartridges, cassettes, or frames
Spectral Range Narrow bands (e.g., UV-cut, IR-pass) Broad or customizable (e.g., HEPA, UV sterilization)
Lifespan 500–10,000 hours (dependent on material) 3–12 months (water/air filters)
Maintenance Minimal (factory-replaced) User-replaceable cartridges
Pressure Drop Negligible (no airflow restriction) Varies (e.g., 0.1–2.0 inches H₂O for air filters)

Qinsun Instruments Co., LTD is a professional laboratory testing instrument manufacturer in China,Have been focusing on laboratory instrument R&D more than 30 years and have rich industry experience,Based on international testing standards,We are also the instrument supplier for BV SGS laboratory,We provide one-stop solutions for lab instruments,Free Training and Turn-Key Service,Products exported all over the world,Offer 36 month warranty and are a trustworthy partner.


在线联系供应商

至: Standard International Group (HK) Limited
Your E-mail:
消息正文:


Send to other suppliers

Other supplier products

Round Track Pilling Tester
Round Track Pilling Tester Product Overview TheRound Track Pilling Testeris a standardized testing instrument designed to evaluate fabric pilling resistance by simulating re...
Retractable CIP rotary spray nozzle
Retractable CIP rotary spray nozzle STD-150 retractable CIP rotary spray nozzle Dynamic Retractor CIP systems clean even the remotest corners. Where to attach the spray head? This qu...
MST clothing pressure tester-QINSUN
MST clothing pressure tester-QINSUN Product Introduction The MST Clothing Pressure Tester/Underwear Pressure tester is used in the body or in the laboratory to easily measure the pr...
Reciprocating Wear Tester
Reciprocating Wear Tester Standards ASTM F2496: Scratch hardness and adhesion testing for prints/coatings. ISO 1518-1 & -2: Scratch resistance determination for pain...
Automotive Wires Low - temperature Impact Tester
Automotive Wires Low - temperature Impact Tester Test standard: ISO 6722. ISO 14572. ISO 19642. SAEJ 1128. QC/T 730. JASOD611-2009 Technical parameters: 1) Low temperature impact height: 50-2...
供应产品

Same products

Tabletop Xenon Arc Weathering Tester (SunMaster)
Tabletop Xenon Arc Weathering Tester (SunMaster) 卖方: Standard Groups Get a quote: Whats/App: +86 185 0176 3615 Web: qinsun-lab.com The Water-Cooled Xenon Lamp Weat...
Blow-By Test Rig
Blow-By Test Rig 卖方: Standard Groups Get a quote: Whats/App: +86 185 0176 3615 Web: qinsun-lab.com Test system for the characterisa...
Air filter System(ISO 16890/EN 779)
Air filter System(ISO 16890/EN 779) 卖方: Standard Groups Get a quote: Whats/App: +86 185 0176 3615 Web: qinsun-lab.com Filter test system for general a...
Oil Thread Leak Test System
Oil Thread Leak Test System 卖方: Standard Groups Get a quote: Whats/App: +86 185 0176 3615 Web: qinsun-lab.com Test System for oil thread leak ...
Manual HEPA/ULPA Filter Scanning Test System
Manual HEPA/ULPA Filter Scanning Test System 卖方: Standard Groups Get a quote: Whats/App: +86 185 0176 3615 Web: qinsun-lab.com The Manual HEPA/ULPA Filter Scan...