BAM 1020-9800 Manual Rev W.docx
Page 61
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Inlet Heater AC: The inlet heater is powered by AC line voltage. The heater either
plugs into an external gray plastic relay enclosure on the back of the BAM (with its own
power cord), or it plugs directly into the back of the BAM and takes power from the
main power supply, with the relay located under a clear plastic cover on the inside
floor of the BAM enclosure. See Section 2.5. Do not open the relay cover or touch the
relay while the BAM and/or the relay box is plugged in. Do not remove the cylindrical
metal shell from the smart heater module, or touch any of the internal parts while the
heater is plugged in. The heater module does not contain any serviceable parts inside
the metal shell.
7.5 Basic Problem and Cause/Solution Table
The following table contains information on some of the more common BAM 1020 problems
which may be encountered, and some steps to identify and remedy the problems. Met One
welcomes customer suggestions for new items to include in this section of future manual
revisions. If the solution cannot be found in the following table, then contact one of our expert
service technicians for help in resolving your problem.
Problem:
The BAM won’t start a measurement cycle.
Cause/Solution:
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The BAM 1020 is programmed not to start a sample cycle until the beginning of
an hour. Make sure the clock is set correctly.
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The BAM 1020 will wait until the beginning of a new hour before it starts, even if
the operation mode is set to ON.
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Don’t expect the pump to turn on until the clean tape count is finished, about 8
minutes after the start of the hour.
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The BAM 1020 cannot start if the pinch rollers are latched UP! The BAM 1020
cannot lower them.
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Make sure the filter tape is installed correctly.
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The BAM 1020 will never start a cycle if the display is left in a TEST or SETUP
menu! The main screen or OPERATE menu must be displayed.
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The BAM 1020 will usually display an error if it cannot start a new sample cycle.
Problem: The analog output voltage and/or digital concentration reading are full-scale.
Cause/Solution:
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The BAM 1020 will force the analog and digital concentration values to full-scale
(usually 0.985mg) to indicate that an error has prevented the collection of a valid
hourly data point, or that the hourly cycle was interrupted. Download the digital
error log to identify the cause. The current hourly record after power-up will also
be full-scale.
Problem: The BAM hourly concentration is reading negative values.
Cause/Solution:
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It is possible for the BAM 1020 to occasionally read negative numbers if the
actual ambient particulate concentration is below the detection limit of the BAM
1020, such as below 3 micrograms. This is because the BAM has a noise band of
several micrograms. This should not happen often.
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If the BAM 1020 is reading negative numbers hour after hour, it may be punching
holes in the filter tape. These holes can be very small. This is almost always
caused by debris on the nozzle or vane. Clean the parts.
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The BKGD zero correction offset value may have been incorrectly entered, or
may need to be audited. Met One supplies the BX-302 zero filter kit for auditing
the zero average and noise floor of the BAM 1020. Set the BKGD value to 0.000
during the test.
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Look for sources of electrical noise, such as bad grounding. Any source of noise
will show up in the zero filter test.
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Verify that the inlet tube is grounded to the chassis of the BAM 1020.
