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NovaStar, QT182, Mask and Respirator Field Tester, 335mm Semi-Circular Arc Radius, Left and Right Field of View <=120 Degrees (New)

NovaStar, QT182, Mask and Respirator Field Tester, 335mm Semi-Circular Arc Radius, Left and Right Field of View <=120 Degrees

Description

  1. Overview
    1. Mainly used for visual field testing of masks and respirators, which is useful for mask and respirator manufacturers, quality supervisors, scientific research, and for testing prior to selling masks.
    2. Applicable standards: GB/T 32610-2016, GB 2626-2019, GB2890-2009.
  2. Features
    1. The equipment is composed of a semi-arc bow, recording device, seat frame and test head die.
    2. Semi-arc bow: the radius is 300 to 340 mm. Can be rotated around the horizontal radius plane passing through the point 0°, and a scale extending to the 90° arc bow every 5° from 0° on both sides, equipped with sliding white visual standard.
    3. Recording device: the recording needle is connected with the visual standard through components such as axle wheel, and the direction and angle of the visual standard are recorded on the visual field drawing correspondingly.
    4. Seat frame: used to support semi-circular arc bow and fixed recording device.
    5. Test head mold: a standard head mold, the two eye holes of the head mold are equipped with small light bulbs, the position of the bulb and the position of the head mold are according to the requirements of GB 2890. The test head die must be installed on the workbench in such a way that the left and right eyes are placed at the center of the semicircular arch and the "0" point is directly seen.
  3. Main Indicators
    1. Semi-circular arc radius: 335 mm.
    2. Left and right field of view: ≤120°.
    3. Bulb distance: the vertex of the bulb is connected after the two eye points (7±0.5).
  4. How It Works
    1. Install a low-voltage bulb in the position of the eyeball of a standard head, so that the vertical angle of its light rays is equal to the vertical angle of the average adult’s field of vision.
    2. When the mask is worn, the cone of light is reduced by the mask’s eye window, and the percentage saved is equivalent to the field of vision saved by a standard head mask.
    3. When the medical field meter measures the field of vision after wearing the mask, it measures the total visual field area of the two eyes and the binocular visual field area of the common part of the two eyes.
    4. The percentage of the total visual field and binocular visual field can be obtained by correcting them with the correction coefficient.
    5. Wear the mask of the lower field of vision (degree), according to the location of the lower intersection of the visual field map.