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44
the system and cause motor damage.
Step eight: 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. 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 and the other goes down; added together this is the "H2O
Step nine: Turn black knob on top of calibrator (TE-5028A) counter clock-wise opening the four
holes on the bottom wide open. Record the manometer reading from the orifice and the continuous flow
recorder reading from the sampler. A manometer must be held vertically to insure accurate readings.
Tapping the backside of the continuous flow recorder will help to center the pen and give accurate
readings. Repeat this procedure by adjusting the knob on the orifice to five different reading. Normally
the orifice reading should be between 3.0” and 4.0” of H2O. If you are using a fixed orifice (TE-
5025A), five flow rates are achieved in this step by changing 5 different plates (18,13,10,7, and 5 hole
plates) and taking five different readings.
Step ten: Record the ambient air temperature, the ambient barometric pressure, the sampler serial
number, the orifice s/n, the orifice slope and intercept with date last certified, today’s date, site location
and the operator’s initials.
Step eleven: Unplug the Adapter from the source voltage (the motor will shut off), unplug the battery,
and reconnect the brush-less motor to the brush-less mass flow controller.
Step twelve: Remove the orifice and top-loading adapter plate.
An example of a PM10 Sampler Calibration Data Sheet has been attached with data filled in from a
typical calibration. This includes the transfer standard orifice calibration relationship which was taken
from the Orifice Calibration Worksheet that accompanies the calibrator orifice. Since this calibration is
for a PM10 sampler, the slope and intercept for this orifice uses actual flows rather than standard flows
and is taken from the Qactual section of the Orifice Calibration Worksheet. The Qstandard flows are
used when calibrating a TSP sampler.
The five orifice manometer readings taken during the calibration have been recorded in the column on
the data worksheet titled "H2O. The five continuous flow recorder readings taken during the calibration
have been recorded under the column titled I (chart).
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