MONARCH INSTRUMENT RLS, Инструкция по эксплуатации

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The RLS should be optically aligned to illuminate the On-Target Indicator
once per revolution. It is recommended that the optical sensor be placed
at a slight angle (15 degrees) from perpendicular so that the sensor will
receive only pulses from the reflective marker. Triggering from contrasting
colors should be done perpendicular to the target. The RLS should be at
least 1 inch from the reflective target to avoid false triggering. The green
LED On-Target Indicator will blink at the input frequency rate when the RLS
is properly aimed.
Note: The green LED On-Target Indicator will blink (on/off) at slow speeds
and remain on steady at high speeds.
Note:
Optical speed sensors require environments that are clean and free
of mist, steam, dirt, oil, and other contaminants to function properly. The
RLS can survive these conditions, but it will not function properly if the
optics are contaminated. Carefully cleaning or drying the optics will restore
normal operation.