BAM 1020-9800 Manual Rev W.docx
Page 63
Problem: The BAM 1020
logs frequent “L” Power Failure errors.
Cause/Solution:
•
The 5 volt DC power supply output must be set to 5.25 volts. Contact the Service
dept for instructions to check or adjust this.
•
The CHASSIS terminal needs to be connected to a good earth ground.
•
Try plugging the BAM into a computer-style UPS.
•
Even a split second power failure will c
ause an “L” error. This will interrupt the
sample cycle until the top of the next hour.
•
Local high power RF fields must be avoided if possible.
•
Some vintages of the DC power supply used in the BAM can be prone to
oxidization on the harness pins which can cause the BAM 1020 to reset
frequently. Upgrade parts may be available for certain units. Current power
supplies have the output harness wires soldered to the supply. Contact the
Service department.
•
Rarely, some older 220 volt units can experience resets caused by the Smart
Heater control wiring inside the BAM. Contact the Service department.
Problem: The BAM data shows repeated concentration values hour after hour.
Cause/Solution:
•
Certain error flags, such as the “T” (tape broken) flag will cause the BAM to
repeat the last known good concentration value until the error is resolved. Check
the error log to identify any errors for those hours. This only occurs on firmware
before R3.6.
•
If the RANGE setting on the BAM is set higher than 2.000mg, them the resolution
of the A/D system is reduced to 2 micrograms. If the ambient air concentrations
do not vary much over several hours, then the BAM data may show repeated
values due to lost resolution. Leave the RANGE set to 1.000mg unless very high
concentrations are expected.
Problem:
Frequent “D” membrane density errors.
Cause/Solution:
•
This usually indicates the membrane foil surface is dirty or damaged. It can be
cleaned with water rinse. Damaged membranes must be replaced.
•
The membrane assembly may not be fully extending or retracting properly, which
causes the metal part of the assembly to partially or completely block the beta
particles. Check the membrane motion.
•
Verify that the ABS expected membrane mass matches the calibration certificate.
Problem: The clock settings are lost when the BAM 1020 is powered down.
Cause/Solution:
•
It is normal for the clock to drift as much as 1 minute per month.
•
The BR2032 lithium battery on the 3230 circuit board may need to be replaced
every 1-2 years.
Problem: The filter tape keeps breaking during normal operation.
Cause/Solution:
•
The photo sensors which watch the tape transport motion may be out of
alignment. Check the photo sensors as described by section 7.16.
•
This is sometimes caused by misalignment of the “SHUTTLE” photo sensor or the
interrupter flag on the end of shuttle beam inside the BAM.
Problem:
The display shows “MISSING TEMP PROBE” message.
Cause/Solution:
•
The BAM 1020 requires a BX-596 or BX-592 ambient temperature sensor if either
the CONC TYPE or FLOW TYPE are set to ACTUAL. If no sensor is attached to
channel 6 of the BAM, this message will appear.
•
If the Auto ID line from the temperature sensor is not working, the BAM will not ID
the sensor, causing the alarm.
•
BAM 1020 units with firmware part 3236-2 (PM10 only) cannot identify the BX-
596.
