E-BAM-9805 Manual Rev B.docx
Page 50
5.10 Filter Sensors Audit
There are four sensors located near the filter tape sample location. They are temperature, relative
humidity, upper pressure (pressure before the tape) and lower pressure (pressure after the tape).
These should be audited using the Filter Sensors test menu (see section 3.5.6) as recommended in
section 5.1.
5.10.1 Filter Temperature Sensor Audit
The filter temperature sensor is used to measure the temperature of the sample air and to monitor
the function of the inlet heater. Set the Filter Sensor field to the TEMPERATURE option. The nozzle
will raise and turn on the pump drawing ambient air in. Depending on difference will determine how
long equilibration will take.
The E-BAM parameter is the instantaneous output from the
unit’s filter temperature 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 filter sensor 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.
Important Note
: It is often difficult to calibrate the sensor if the E-BAM is warm. The heating of the
unit will increase the sample temperature (as it should) making it difficult to compare the E-BAM
filter temperature reading to an ambient temperature traceable standard reading. If the
sensor is to be calibrated, it is best to do it when the E-BAM is cold (equilibrated to ambient) and the
vane is lowered. It is recommended to leave the sensor at the factory default calibration.
The E-BAM filter temperature sensor very rarely fails.
5.10.2 Relative Humidity Sensor Audit
The filter relative humidity sensor is used to measure the humidity of the sample air and to control
the inlet heater to prevent moisture from being sampled as particulate mass. Set the Filter Sensor
field to the HUMIDITY option. The nozzle will raise and turn on the pump drawing ambient air in.
Depending on difference will determine how long equilibration will take.
The E-BAM
parameter is the instantaneous output from the unit’s filter internal relative humidity
(RH) sensor. This is the parameter being audited. The Standard parameter is the field where the
correct RH as shown on the traceable reference standard RH audit device is entered.
Position the reference standard as closely as possible to the filter sensor and allow them to
equilibrate. Compare the E-BAM value to the standard. If an adjustment is necessary, enter the
correct RH 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
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