E-BAM-9805 Manual Rev B.docx
Page 44
5.5.2 Nozzle Interior Cleaning
Every six months, the inside of the nozzle assembly should be cleaned. This process simply
involves blowing low pressure compressed air through the assembly.
CAUTION: Never attempt to remove or disassemble the nozzle assembly! The beta source is
housed inside the nozzle.
1. Advance the filter tape to a fresh spot.
2. Remove the PM10 head (and the PM2.5 sharp cut cyclone, if installed) and the short inlet
tube from the top of the E-BAM.
3. Turn on the sample pump and, while the pump is running, use a can of dusting air with a long
plastic nozzle to blow through the inlet on top of the monitor. Three to four blasts at different
angles should be sufficient. This will dislodge any particulate from the inside of the nozzle
and sample tube walls and deposit it onto the tape.
4. Repeat the process until the tape spot no longer shows signs of particulate. The tape may
need to be advanced to an unused spot to determine this.
5. Replace the inlet tube and cyclones when finished.
5.6 Ambient Temperature Sensor Audit
The ambient temperature must be audited or calibrated before any flow calibrations are performed.
Enter the Ambient Temperature calibration screen (see section 0) and perform a single point
verification of ambient temperature. This is acceptable for all field calibrations.
The E-BAM parameter is the instantaneous output from the 597A sensor. This is the parameter
being audited. The Standard parameter is the field where the correct temperature as shown on the
traceable reference standard temperature audit device is entered.
Position the reference standard as closely as possible to the AT sensor of the 597A and allow them
to equilibrate. Compare the E-BAM value to the standard. If an adjustment is necessary, enter the
correct temperature in the Standard field and then press the CALIBRATE key to correct the E-BAM
sensor reading. The E-BAM and Standard parameters should now match. Press the X key to exit
the screen when finished.
If difficulty is encountered during the process, the DEFAULT key can be pressed to erase all field
calibration factors from the temperature sensor and to start over with factory default calibration
factors. Then try the calibration again.
5.7 Ambient Barometric Pressure Sensor Audit
The ambient barometric pressure must be audited or calibrated before any flow calibrations are
performed. Enter the Ambient Temperature calibration screen (see section 3.5.3) and perform a
single point verification of ambient barometric pressure. This is acceptable for all field calibrations.
The E-BAM parameter is the instantaneous output from the 597A sensor. This is the parameter
being audited. The Standard parameter is the field where the correct pressure as shown on the
traceable reference standard pressure audit device is entered.
Position the reference standard as closely as possible to the BP sensor of the 597A and allow them
to equilibrate. Compare the E-BAM value to the standard. If an adjustment is necessary, enter the
correct pressure in the Standard field and then press the CALIBRATE key to correct the E-BAM
sensor reading. The E-BAM and Standard parameters should now match. Press the X key to exit
Содержание E-BAM
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