Using the Dew Zapper Pro
The Dew Zapper Pro will prevent dew from forming on your optics for
as long as it is in use. You should use the Dew Zapper Pro before dew
forms on your telescope or accessory lens. If dew is already present,
the Dew Zapper Pro may be capable of gradually removing the dew;
this depends upon the conditions.
Operating the Control Box
The Dew Zapper Pro’s control box allows the amount of heat provided
to the heating element bands to be adjusted. It features microproces-
sor controlled circuitry which adapts to changing temperature and
humidity. This allows for precise temperature control. Up to four heat-
ing bands can be controlled at once.
Plug the control box’s power cord into your power source. A red LED
on the plug and green LED on the control box will indicate the Dew
Zapper Pro is properly powered on.
Remove the jack covers from the control box as needed. Plug a heat-
ing band into one of the jacks. Each of the control knobs controls the
jack aligned with it (
Figure 3). Turn the control knob clockwise and the
channel’s red LED will light up to indicate the channel is active.
Under normal use, you only need to set the control knob to about 25%
power (with the control knob at the 9 o’clock position). If the dew con-
ditions become severe, you can increase the power to
MED/50%. If
dew is has formed on your lens, turn the control knob to
HI/100%.
Return the setting to about 25% once the dew is gone.
Battery Saver
The Dew Zapper Pro features a battery saver to protect the life of your
battery. If the input voltage drops to 11.25 volts, the green
POWER LED
will flash. To preserve your battery, the Dew Zapper Pro will automati-
cally power itself off approximately 30-60 minutes after the
POWER
LED begins flashing. This is useful if you are using a car battery or
sharing your battery with other devices, like a motor drive for your tele-
scope mount.
The battery saver can be disabled if you are using a dedicated power
source. To disable the battery saver, move Switch
1 (located inside
the small square hole on the left side of the control box) to the down
position (
Figure 4). The down position is actually labeled “ON”, which
disables the battery saver. Switch
2 is not used.
Auxiliary Output Jack
The Dew Zapper Pro has a 12-volt DC auxiliary port located on the
right side of the control box next to the power cord. The auxiliary port
can be used with an optional 12-volt DC accessory equipped with a
standard RCA-type plug. The accessory should not draw more than
10 amps.
Specifications
Power requirement:
12V DC, “cigarette lighter” receptacle
Fuse:
10
A
Heating band controls:
Variable output, up to 4 heating bands can
be independently controlled
LEDs:
Green power LED, 1 red heating band
control LED per channel, 1 red power plug
LED
Battery saver:
Power LED warning at 11.25V, power
shut off at 11.1V, disable switch
Auxiliary output:
12V DC, 10 A max
Control box cord length:
12'
Heating band cord length: 6'
Figure 3.
Each of the four the control knobs controls the jack aligned with it.
Figure 4.
Move Switch 1 to the down position to disable the battery saver.
Switch 2 is not used.
Band
Length
Max Input Current (Amps) Max Heat Output
(Watts)
4"
0.0167
0.2
6"
0.375
4.5
15"
0.940
11.3
27"
1.688
20.3
37"
2.31
27.7
