TE-PNY1123 19 Operations Manual
2. Mount the calibrator orifice and top loading adapter plate to the sampler. A
sampling filter is generally not used during this procedure. Tighten the top
loading adapter hold down nuts securely for this procedure to assure that
no air leaks are present. Also, the 6" Spool Piece is usually empty during
calibration but make sure of no leaks.
3. Turn unit on and allow the sampler motor to warm up to its normal
operating temperature.
4. Conduct a leak test by covering the hole on top of the orifice and pressure
tap on the orifice with your hands. Listen for a high-pitched squealing
sound made by escaping air. If this sound is heard, a leak is present and the
top loading adapter hold-down nuts need to be re-tightened. Avoid
running the sampler for longer than 30 seconds at a time with the
orifice blocked. This will reduce the chance of the motor overheating.
Also, never try this leak test procedure with a manometer connected to the
side tap on the calibration orifice or the blower motor. Liquid from the
manometer could be drawn into the system and cause motor damage.
5. Connect one side of a water manometer to the pressure tap on the side of
the orifice with a rubber vacuum tube. Leave the opposite side of the
manometer open to the atmosphere.
Note: Both valves on the manometer have to be open for the liquid to flow
freely also to read a manometer one side of the 'U' tube goes up the other
goes down; add together this is the "H2O
6. A manometer must be held vertically to insure accurate readings. Repeat
this procedure until the readings have been taken from all five resistance
plates. When using a variable orifice, five flow rates are achieved in this step
by adjusting the knob on the variable orifice to five different positions and
taking five different readings. Careful: if TE-5028 is wide open (knob
turned all the way counterclockwise), you might get more than 8
inches on oil manometer connected to bottom of blower motor. Turn
knob clockwise before turning unit on and check it for a visible
reading. DO NOT suck oil up into top reservoir of oil manometer.
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