Parameter | Specification |
a. Light source | Incandescent lamp operated at nominal rated voltage |
b. Spectral response of photocell | Photopic (daylight spectral response of the human eye) |
c. Angle of view | 15º maximum total angle |
d. Angle of projection | 15º maximum total angle |
e. Calibration error | Plus or minus 3 percent opacity; maximum |
f. Zero and span drift | Plus or minus 1 percent opacity, 30 minutes |
g. Response time | Less than or equal to 5 seconds |
Ariz. Admin. Code tit. 18, ch. 2, APPENDICES, app Table 1