Section 3
Powering Up/Leak Checking 1400a TEOM Monitor
3.1 Powering up the TEOM
1. Supply the appropriate voltage to the instrument.
Press the APOWER@ switch to the on position, on
the front panel of the control unit=s display (see
Figure 1).
2. The Title screen will appear on the control
unit=s display. After six seconds the Main
screen will appear (see Figures 2 & 3).
3. Make sure that the vacuum pump is running. It
will start drawing a sample through the system.
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Note 1: Once the power switch is pressed, the ACHECK STATUS@ light will come on. This is
because the flow rates and the temperatures are outside of the tolerance ranges. The
ACHECK STATUS@ light will remain lit during the first 30 minutes after the power
switch is turned on while the monitor warms up. The Status light will automatically turn
off after all flow rates and temperatures reach the tolerance ranges (see Figure 4).
Note 2: The flow controllers inside the control unit will make a slight Aclicking@ sound when
the instrument is turned on (see Figure 5). The instrument automatically resets itself
when it is turned on. As part of the initialization procedure, the monitor waits until the
flow rates and temperatures stabilize within a narrow range for 30 minutes before
starting data collection. This ensures the validity of all data points computed by the
system.
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3.2 Leak Checks
1. With the TEOM plugged into the appropriate power source, turn on the unit. Make sure the
vacuum pump is running.
2. Remove the TEOM filter from the mass transducer according to the set-up instructions in
subsection 1.6 Sample Preparation and Filter Installation (Section 1, page 23 of this
manual).
3. Once the filter is removed, make sure the mass transducer is closed and the sensor door is
closed.
4. When at the Main screen, press the up (<>) and down (<>) arrow keys to display the main
flow and auxiliary flow values on the four-line display (see Figures 6, 7 & 8).
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5. Locate the flow audit adapter which is in the flow audit adapter kit.
6. Remove the sample inlet from the flow splitter.
7. Remove the sharp cut cyclone from the flow splitter and install the flow audit adapter (see
Figure 9).
8. Close the valve of the flow audit adapter.
9. When in the Main screen, the main flow reading should read less than 0.15 l/min. The
auxiliary flow reading should read less than 0.65 l/min. If the main flow reading is less than
0.15 l/min and the auxiliary flow reading is less than 0.65 l/min, slowly open the valve on the
flow audit adapter to gradually release the vacuum in the system. The leak check is
completed. Replace the sharp cut cyclone and the sample inlet.
10. If the main flow reading is greater than 0.15 l/min and the auxiliary flow reading is greater
than 0.65 l/min, check the hose fittings and other critical connections in the flow system for
leaks and then repeat steps 8 & 9.
If the main flow is now below 0.15 l/min and the auxiliary flow reading is less than 0.65
l/min, then gradually open the valve on the flow audit adapter to release the vacuum.
11. If the main flow reading is greater than 0.15 l/min and the auxiliary flow is greater than 0.65
l/min, the leak check procedure must be repeated using an offset value to account for the
characteristic non-linearity of the mass flow sensor.
12. To determine the non-linearity offset value (NOV), slowly open the valve on the flow audit
adapter. Disconnect or unplug the vacuum pump from its power source so that the pump is
not running.
13. In the main menu with the main flow and auxiliary flow readings being displayed, wait 1
minute and observe the main flow and auxiliary flow readings. These are the NOV=s for
both the main flow and auxiliary flow. Record these values.
14. Plug in or reconnect the vacuum pump so that it is running. Wait 3-5 minutes to allow the
main flow and auxiliary flow to stabilize. When both flow rates have stabilized, close the
valve on the flow audit adapter.
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15. At the Main screen, the main flow reading should read less than 0.15 l/min plus the main
flow NOV, and the auxiliary flow reading should read less than 0.60 l/min plus the auxiliary
flow NOV.
Example: If the NOV for the main flow was recorded as 0.08 l/min, add 0.08 to 0.15 for a
total of 0.23 (0.08 + 0.15 = 0.23). The main flow reading should be less than 0.23
l/min.
If the NOV for the auxiliary flow was recorded as 0.12 l/min, add 0.12 to 0.65 for
a total of 0.77 (0.12 + 0.65 = 0.77). The auxiliary flow reading should be less
than 0.77 l/min.
If the flow readings exceed these calculated values, perform an analog board calibration
(refer to R&P=s service manual). This may also indicate that there is a faulty connection or
component (such as the mass flow controller or the vacuum pump). If the readings do not
exceed the calculated flow rates, slowly open the flow audit adapter valve to release the
vacuum. Remove the audit adapter from the flow splitter. Install the sharp cut cyclone and
the sample inlet onto the flow splitter. Replace the TEOM filter in the mass transducer, close
the mass transducer and the sensor unit door.
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