Videolarm pfdw75tf2n Betriebsanweisung
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PrEssurIZInG tHE EncLosurE
Air is inserted in the enclosure through the Schreader valve located
on the top of the unit. A pressure release valve is located under the
housing cap located in this same location. Air vents from the pres-
sure release valve between the housing top and the cap.
on the top of the unit. A pressure release valve is located under the
housing cap located in this same location. Air vents from the pres-
sure release valve between the housing top and the cap.
Figure 4
Vent holes
Schraeder
valve
Before inserting air into the housing be sure the (2) cap vents
are free of obstructions such as ice or debris (Figure 4).
are free of obstructions such as ice or debris (Figure 4).
Pressurized housings provide maximum protection for CCTV
cameras and lenses. The charge of dry nitrogen inside the housing
eliminates the effects of moisture, dust, insects and corrosive exhaust
fumes. This allows a longer lifetime for your surveillance equipment.
cameras and lenses. The charge of dry nitrogen inside the housing
eliminates the effects of moisture, dust, insects and corrosive exhaust
fumes. This allows a longer lifetime for your surveillance equipment.
To pressurize the housing, you must have the following:
1. A tank of dry nitrogen
2. A regulator on the tank
3. A hose with air chuck to connect the regulator to
the housing’s intake valve
2. A regulator on the tank
3. A hose with air chuck to connect the regulator to
the housing’s intake valve
dry nitrogen
Nitrogen is a readily available. To obtain supplies, check your local
yellow pages for a medical or industrial gas provider. If the tank is to
be carried from location to location, a size of 40 cubic foot is recom-
mended. This should be enough to refill 30 individual housings.
Handle the tanks with care. Although nitrogen is an inert gas, the
tank is highly pressurized and if the valve or regulator is damaged
the tank could be dangerous. Tanks of dry nitrogen can be kept for
several years.
yellow pages for a medical or industrial gas provider. If the tank is to
be carried from location to location, a size of 40 cubic foot is recom-
mended. This should be enough to refill 30 individual housings.
Handle the tanks with care. Although nitrogen is an inert gas, the
tank is highly pressurized and if the valve or regulator is damaged
the tank could be dangerous. Tanks of dry nitrogen can be kept for
several years.
the regulator
The tank will have a standard 580 fitting, but a regulator will be
required. A recommended regulator for the tank would be a Harris
#9296-15-580 or #425-15-580. For local distribution you can contact
Harris at 800-241-080
required. A recommended regulator for the tank would be a Harris
#9296-15-580 or #425-15-580. For local distribution you can contact
Harris at 800-241-080
4.
the Hose
The purge valve, called a “Schraeder” or “dill” valve, is similar to the
air intake valve on car or bicycle tires. To connect the regulator to
the purge valve on the housing, you’ll need a hose with a 1/4” barb
on one end and an air chuck on the other. The barb connects to the
regualtor, the air chuck to the Schraeder valve. These hoses can be
obtained at local auto parts stores.
air intake valve on car or bicycle tires. To connect the regulator to
the purge valve on the housing, you’ll need a hose with a 1/4” barb
on one end and an air chuck on the other. The barb connects to the
regualtor, the air chuck to the Schraeder valve. These hoses can be
obtained at local auto parts stores.
!
Pressurizing and Purging the Housing
(to remove moisture)
(to remove moisture)
Set the gauge on the regulator to between 10 and 20 psi. Place the
air chuck on the Schraeder valve, just as you would on a tire, and
press down to begin filling. Continue until you hear air venting from
the pressure relief valve (located under plastic cover–see Figure 3 on
previous page). Drain all air in housing and refill housing . Repeat an
additional 2 times. After refilling for the third time, check pressure in
housing. It should read between 5 to 7 psi.
air chuck on the Schraeder valve, just as you would on a tire, and
press down to begin filling. Continue until you hear air venting from
the pressure relief valve (located under plastic cover–see Figure 3 on
previous page). Drain all air in housing and refill housing . Repeat an
additional 2 times. After refilling for the third time, check pressure in
housing. It should read between 5 to 7 psi.