Dew Remover Heaters, Controllers and Power Sources
Dew Remover Heaters are heater strips designed for use in 12 volt
systems. The heater wraps around the telescope tube and secures
with a Velcro tab. The outer surface of the heater strip is insulated
to direct the heat into the telescope, reducing waste of your battery
juice. With or without a dew shield, dew heaters let you view when
unheated scopes are foggy!
Using polymer thick film resistive heater technology, sixty-six percent
of the surface area is heat emitting, meaning even heat distribution
and no localized hot spots or burnouts. Because of the increased
contact area with the scope, this type of dew heater provide more
effecient heating with less wattage.
Each heater has a six foot cable with a phono-plug connector that
fits the popular controllers from Kendrick, Dew Buster, etc, and can
also be powered directly from a 12 volt power source with our
optional cigarette lighter adapter. These heater's flexibility allows
it to be used on scopes along with dew shields and rail systems.
The heater strips are available for all popular sized telescopes.
Measure the diameter of your telescope to choose the right size
heater. For in between sizes, err on the long side as the heaters
can overlap itself and work normally. Specs at bottom of this page.
#DN16 is a heater patch for hand controllers like the Meade Autostar
and Celestron controller. The 3-1/4 watt heater in contact with the
back of the controller keeps it warm so the LCD display doesn't
become sluggish or frost up. Best used with the SmartCases for
Celestron, but can also be held on with user supplied
Elastomeric Retention Devices. (Rubber Bands) More information
#DN18 is a heated Telrad Dew Shield, when flipped down it shields
the telrad glass fron dew and heats it! Telrad not included.
#DN19 is a tandem heater set with a single 6 ft wire, for big binocular
objectves up to 3.3" or 110mm outside diameter. Also has a short
female power jack for connecting #DN17 eyepiece heaters.
The #DNCP Fused Cigarette Lighter Plug Adapter provides an easy
solution for simple installations, replacing expensive controllers.
It comes with a 5 amp replacable 3AG type fuse, which will support
all of the heaters listed below. Six ft long, and includes a Y cable to
support two dew heaters. Also works with other brand dew heaters.
Prices include shipping in the USA!
About our polymer thick film
resistive heater technology:
Thick film heaters are the current technology used for resistive heating,
verses nickel-chromium (nichrome) resistive wire heating. Resistive wire
heating is used for very high temperatures like portable space heaters, but
it's not particularly well suited for dew heaters. Thick film heaters are also
used for high temperatures, and the same technology is used for residential
and commercial electric strip space heaters, industrial process heating, etc.
The wattage rating of these heaters is not limited by the technology or
construction, as much higher temperatures could be achieved if needed.
The large heated surface area of heaters allows more efficient heat
transfer than a single resistive wire element, thereby decreasing the
power needed to cause the same temperature rise in the telescope.
The heater strips are made by basically printing a pattern of resistive
goop on a high temperature plastic substrate. When the goop cures and
hardens, a second plastic sheet is laminated on top, making a sandwich
with the thick film heating element inside. Heat transfer thru the plastic
substrate is efficient and well distributed, with the majority of the surface
transferring heat into the telescope tube. The construction of the
heater strips protects the actual heating material, allowing them to be
flexed without concern. The power cable conductors are machine crimped
to the heating material and mechanically terminated to provide a durable,
flexible interface. The robust construction makes a heater that does not
"burn out" over time like resistive wire heaters.
Two Channel Dew Heater Controller
Astrozap Flexi-Heat Dew Shields are Here!