SpotOn 35650, Product Manual, Page: 7 / 36

INSTRUCTIONS IN ENGLISH
| QUANTUM PAR LIGHT METER
5
The DLI calculation can be reset to zero by pressing and holding both the POWER and SCAN
buttons simultaneously until you see the DLI value change to 0.0. The integration and calculation
of DLI will start accumulating a new 24 hours’ worth of 3-minute readings from that point forward.
Note: If there is a battery in the meter, it will take and store a light reading every 3 minutes (this
function does not affect expected battery life).
Cleaning the Sensor
Use a damp cloth to clean the light sensor; mild soap may be used if needed. Do NOT use
chemicals like alcohol, acetone, or ammonia-based cleaners. They can damage the white diffuser
disc.
Changing the Battery
The LCD will show an empty battery icon when it is time to change the battery. Remove the screw
cover (6) of Fig. 5 by rotating counter clockwise. A screwdriver may be required to loosen the
cover. Gently pry out the old battery with a small knife or tiny screwdriver as shown in (8) of Fig.
6, being careful not to damage the battery holder. Replace with a new
CR2032 lithium coin cell
battery
and replace the screw cover. Tighten the cover clockwise until the o-ring seal is slightly
compressed.
Daily Light Integral (DLI) Readings
The SpotOn® Quantum PAR Light Meter always takes a light
reading every 3 minutes. The Daily Light Integral (DLI) is
calculated from the past 24 hours of 3-minute readings and is
updated every 15 minutes. Readings are automatically taken
regardless if the meter’s display is on or off. The DLI value
is displayed on the LCD for 3 seconds every time the meter is
turned on. The current DLI value can be viewed by turning the
meter on or power cycling (off and on) as needed.
Fig.6
SpotOn® Quantum PAR Light Meter Item #35650