1. Main purpose:
      According to the relevant: GB 2890-2009 Respiratory protection self-priming filter gas mask 6.8 field of view; GB 2626-2019 Respiratory protective products self-priming filter anti-particle respirator 6.10 field of view; GB/T 32610-2016 daily protective mask technical specifications 6.12 field of view Standard production, mainly used for visual field testing of masks, face masks, respirators, etc. It is suitable for masks and respirator manufacturing enterprises, quality supervision, scientific research, wearing and other units.
Second, the main features:
     1. The overall equipment consists of semi-circular arc bow, recording device, seat frame, test head mold, etc.
     2. Semi-circular arc bow: The radius (300-340) mm can be rotated around the horizontal radius surface passing through the midpoint 0°, and the two sides have a scale extending from 0° to 5° from each 0° to the 90° arc bow. White optotype.
     3. Recording device: The recording needle is linked with the visual mark through the shaft wheel and other components, and the orientation and angle of the visual mark are recorded on the visual field drawing correspondingly.
     4. Stand: used to support the semi-circular arc bow and fixed recording device.
     5. Test head mold: a standard head mold, with small bulbs in the two eyelets of the head mold, the position of the bulb and the placement of the head mold are in accordance with the requirements of the standard GB 2890. The test head mold should be installed on the worktable so that the left and right eyes are placed at the center of the semi-circular arc bow, and look directly at its "0" point.
Three, specifications:
*Display and control: color touch screen display and control, parallel metal button control.
* The radius of the arc bow (300-340) mm: it can be rotated around the level of 0°, and the two sides have a scale extending from 0° every 5° to 90°. There is a sliding white visual mark on the arc bow.
*Recording device: The recording needle is linked with the visual mark through the shaft wheel assembly, and the corresponding position and angle of the visual mark are recorded on the visual field drawing.
*Standard head type: the bulb apex of the pupil position device of the two eyes is 7±0.5mm behind the midpoint of the two eyes. The standard head type is installed on the work table so that the left and right eyes are placed at the center of the semi-circular arc bow and straight See its "0" point.
*Power supply and power: 220V, 50Hz, 500W
*Dimensions (L×W×H): 580mm×380mm×700mm
*Weight: about 50Kg