Thermo Scientific Thermolyne NCAT F85930, Installation And Operation Manual

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6
Installation
Balance Installation
22 NCAT Asphalt Content Tester Thermo Scientific
2. Flexible 3" I.D. seamless steel tubing or electrogalvanized steel tubing is recommended for venting.
Lightly seal connections at blower exit at the top of the tester with clear silicon such as DOW >32
or GE RTV or equivalent. Use sparingly so the exhaust tube can be detached for servicing. Do not
use galvanized tin dryer pipe or double-wall galvanized tin as the seams will leak fumes into the lab.
Do not use vent pipe that is reduced to less than 3" I.D.
3. Minimize 90° bends in your exhaust system if possible. Bends restrict the exhaust air flow and tend
to accumulate particulates which can also restrict air flow.
4. Termination of your exhaust system may be in open air or to a larger exhaust duct. Open air
termination is the most efficient. Duct termination should not be in the vicinity of fresh air
intakes. Also, the duct cap must not restrict the air flow. Exhausting into a larger duct requires an
airtight connection. The larger duct must not create a positive air pressure internally which can
diminish the “tester’s” blower efficiency. Perform the “lift test” to ensure a -3.2 to -8.2 gram lift.
(See
“Lift Test Procedures” on page 27 ). Increasing the velocity of the exhaust flow above the lift
of - 8.2 grams may blow fines from the basket resulting in an exaggerated asphalt cement content.
5. Turn on fume hood blowers and conduct “lift test” to ensure the -3.5 to -10 gram lift is
maintained. Perform the test with room doors open and closed to ensure proper makeup air for
the room.
Balance Installation
The NCAT Asphalt Content Tester is supplied with an electronic balance, for use in the NCAT
Asphalt Content Tester. The balance operates on voltage supplied by the tester. The balance is shipped
in a separate carton containing specialized packaging material. It is recommended that the specialized
carton and packaging be retained for safe balance storage or reshipment.
The balance carton will contain the following:
The balance is shipped separately to ensure that the balance is not damaged during
shipment.
Appropriate exhaust must be provided to remove smoke and gases produced in a
testing procedure. Seamless flexible exhaust tubing with an inside diameter of 3" is
recommended. Seamless flexible 3" steel tubing is available. (See
“Replacement Parts”
on page 73 ).
The exhaust exiting the furnace exhaust port may reach 270°C. Do not use
flammable materials or materials with a low melting point for exhaust tubing.
1 Balance
1 Support plate
1 Catch pan
4 Screws