Campbell TB4, Product Manual

Page: 38 / 49

Appendix C. CS700H Operation Details
C-4
If the heating elements are left turned on, the funnel
temperature may reach a point where the snow evaporates
before it hits the funnel!
C.3 Status LED
The Status LED, within the ambient temperature sensor probe, flashes to
indicate the mode that the CS700H is in (see TABLE C-2 ).
TABLE C-2. Status LEDs
Mode Flash Rate Description
Long Flash LED on for 0.5 s Controller powering up.
Slow Flash 1 flash every 1.5 s
In standby mode waiting for a
heating cycle.
Medium Flash 2 flashes per second
Within a heating cycle and the
heating elements are presently
turned off. Waiting for snow to be
present before turning on heaters.
Fast Flash 8 flashes per second
Within a heating cycle and the
heating elements are presently
turned on.
C.4 Snow Sensor
The snow sensor is actually a capacitive proximity sensor that registers any
material object within a few mm range. The sensor power is turned on and off
to conserve power. TABLE C-3 lists the conditions that power is applied.
The state of the snow sensor (snow detected) is read using the measure (
a
M! )
and data ( a
D0!
) commands (fourth value).
The snow sensor must detect snow continuously for 5 s before the
detected flag is set to 1 . And conversely, snow must be absent for
5 s continuously before the detected flag is reset to 0 . This process
prevents a premature heating cycle when in the automatic mode.
CAUTION
NOTE