Product Overview

The KR‑2528 mask visual‑field evaluator is a dedicated PPE test rig for assessing visual obstruction caused by respirators and protective masks. Based on optical projection principle, light sources installed inside a calibrated anthropomorphic head‑form cast light onto a translucent hemispherical scale screen. Mask frames and eye‑windows block portions of light, allowing operators to read the remaining effective viewing angle directly from the spherical grid scale.

This bench‑top unit validates whether peripheral vision meets regulatory thresholds for gas masks, particulate respirators and everyday protective masks. It complies with GB 2626‑2019, GB 2890 and EN 136 requirements. It finds wide application within mask‑manufacturing quality‑control workshops, PPE design labs, occupational‑safety inspection centres and accredited third‑party testing facilities.

Core Product Competitive Advantages

1. High‑transparency durable acrylic hemispherical projection screen Large‑size hemispherical panel features superior light transmission and anti‑ageing performance. Printed angle grid markings deliver clear read‑outs of blocked and available viewing sectors, minimising subjective judgement deviations during visual‑field assessment.
2. Standard‑compliant anthropomorphic head‑form assembly Dummy‑head geometry replicates average adult facial‑feature proportions with 62.5 mm pupillary‑distance. Built‑in internal light sources simulate human‑eye light‑emitting points to restore real‑world wearing test conditions.
3. Adjustable movable head‑form base platform Sliding rail‑mounted head‑form support enables precise horizontal positioning. Operators align eye‑points to the spherical‑screen centre quickly for different mask‑style samples.
4. Robust aluminium‑profile machine frame construction Main supporting framework adopts extruded aluminium alloy, delivering high structural rigidity while resisting surface corrosion. Height‑adjustable levelling feet compensate for uneven lab‑floor surfaces and stabilise the whole test station.
5. Simple‑setup manual‑observation workflow No complex computer software required. After mask mounting and light‑source activation, test operators read visual‑field‑angle results straight from spherical‑scale markings. Short preparation time supports frequent batch‑sample screening tasks.

Complete Technical Parameter Table

Compliance Standards: GB 2626‑2019, GB 2890, GB/T 32610, EN 136

Standard Complete Test Operating Workflow

1. Pre‑Test Preparation Place instrument on level lab ground, adjust levelling feet for horizontal stability. Connect mains‑power‑supply. Check hemispherical screen surface for dirt or scratches. Move the head‑form on sliding rails and align eye‑light‑source position to the spherical‑screen centre point.
2. Specimen Mounting Fit target mask / respirator securely onto the standard head‑form. Adjust strap tension to replicate real‑wearing fit. Ensure mask frame and eye‑window sections sit in their natural operating posture without distortion.
3. Launch Visual‑Field Projection Test Turn‑on built‑in eye‑simulating light sources. Light beams project onto the translucent hemispherical scale screen. Mask structures produce shadow areas corresponding to visual‑obstruction zones.
4. Visual‑Angle Reading & Result Recording Read left‑eye and right‑eye available viewing‑angle values directly from spherical‑grid scale. Compare measured visual‑field figures against standard‑limit requirements and document pass‑or‑fail conclusion within lab‑records.
5. Post‑Test Tidying Switch‑off internal light sources. Remove mask specimen. Keep hemispherical acrylic panel free of dust and fingerprints. Power‑off main‑unit when all testing batches are finished. Inspect head‑form sliding‑rail movement status periodically.

Wide Industrial Application Scenarios

Respirator & Mask‑Manufacturing Enterprises

Batch visual‑field performance screening for gas‑masks, dust‑respirators and daily‑use protective masks; evaluate how shell‑shape and frame‑layout impact wearer’s field‑of‑view during new‑product development cycles.

PPE Product‑Design & R‑D Departments

Optimise mask outline and eye‑window layout; strike balance between protective‑sealing performance and unobstructed user‑visibility.

Occupational‑Safety & Medical‑Device‑Inspection‑Institutes

Carry‑out multi‑standard‑compliant visual‑field verification for respiratory‑protective‑goods.

University Safety‑Protection‑Material‑Research‑Laboratories

Experimental‑teaching‑apparatus for respirator ergonomics and visual‑obstruction‑related research subjects.

Third‑Party Accredited‑PPE‑Testing‑Organizations

Conduct formal visual‑field‑assessment and produce inspection‑documents for product‑certification‑audits.

Standard Factory‑Full‑Delivery Kit

1. KR‑2528 mask visual‑field‑tester main frame‑unit
2. Standard anthropomorphic head‑form assembly with internal simulated‑eye light‑sources
3. High‑transparency marked‑grid acrylic hemispherical projection screen
4. Aluminium‑profile supporting frame and height‑adjustable levelling feet
5. Power‑supply connecting‑cable
6. Multilingual printed‑operation‑manual complying with GB‑EN‑relevant‑test‑specifications
7. Factory‑issued performance‑inspection‑certificate

Optional spare‑parts & custom‑options: replacement acrylic hemisphere panel, alternative‑spec head‑form variants, custom‑voltage power‑supply‑adaptation.

Global Distributor & After‑Sales‑Support

We provide remote‑one‑on‑one operational guidance covering specimen‑mounting, head‑form position‑adjustment and routine surface‑cleaning‑maintenance. Spare‑parts stock includes acrylic‑screen spare‑parts, light‑bulb components and sliding‑rail accessories. Bulk‑order customers can apply for custom‑power‑supply‑voltage variants for overseas‑market deployment. Regional‑exclusive‑agent privileges contain priority‑production‑scheduling, OEM private‑branding‑services and complete‑set high‑definition product‑marketing‑image‑resources.

Product‑Banner‑Marketing‑Slogan

KR‑2528 Mask Visual‑Field Tester | GB2626‑GB2890‑EN136‑Compliant Respirator‑View‑Obstruction‑Evaluator For PPE‑Lab‑QC‑Certification‑Testing

Core‑Feature‑Labels‑For‑Product‑Images

GB2626‑GB2890‑EN136‑Compliant, Mask‑Visual‑Field‑Obstruction‑Test, 300mm‑Hemisphere‑Radius, ≤120°‑Measurable‑Field‑Of‑View, 62.5mm‑Standard‑Pupil‑Distance, Transparent‑Marked‑Acrylic‑Hemisphere, Standard‑Light‑Equipped‑Head‑Form, Sliding‑Rail‑Head‑Form‑Platform, Aluminium‑Alloy‑Frame‑Build, Levelling‑Adjustable‑Support‑Feet, Manual‑Optical‑Projection‑Measurement, Respirator‑Ergonomic‑Visibility‑Performance‑Evaluation

Safety‑Operation‑Reminder

Avoid scratching or contaminating the acrylic hemispherical‑screen surface; clean only with soft lint‑free cloth. Do not stare directly at internal light‑sources for extended periods. Check head‑form sliding‑rail movement regularly. Ensure reliable equipment‑grounding before power‑on.