BAM 1020-9800 Manual Rev W.docx
Page 36
5.7 Field Calibration of the Flow System
– Actual Flow Mode
Flow calibrations, checks, or audits on any BAM 1020 set for actual flow control are very fast
and easy. An ambient temperature sensor must be connected to input channel 6. The FLOW
TYPE setting must be set to ACTUAL in the SETUP > CALIBRATE menu, or the flow
calibration screen will not even appear as an option in the TEST menu. Perform a leak check
and nozzle cleaning before doing any flow calibrations.
The TEST > FLOW calibratio
n screen is shown below. The “BAM” column displays what the
BAM 1020
measures for each parameter. The “STD” column is where you can enter the
correct values from your traceable reference standard device. The <CAL> symbol appears to
the left of row of the active selected parameter. The selected parameter can be changed by
pressing the NEXT key. No calibration changes are made to the selected parameter unless
the CAL or DEFAULT key is pressed. The ambient temperature and pressure are always
calibrated before the flow, because the BAM 1020 uses these parameters to calculate the air
flow rate in actual mode.
MULTIPOINT FLOW CALIBRATION
TARGET BAM STD
AT: 23.8 23.8 C
BP: 760 760 mmHg
<CAL> FLOW 1: 15.0 15.03 15.00 LPM
FLOW 2: 18.4 18.41 18.40 LPM
FLOW 3: 16.7 16.67 16.70 LPM
CAL NEXT DEFAULT EXIT
Actual Flow Calibration Screen
1. Enter the TEST > FLOW menu as shown above. The nozzle will lower automatically
when this screen is entered.
2. (Optional Audit Only)
To perform a simple flow “check” or “audit” in which no
calibrations are to be changed, simply use the NEXT soft key to select the AT
(temperature), BP (pressure), and FLOW 3 (16.7) parameters one at a time. Compare
the BAM column reading to your standard device for each parameter, and record the
results. No calibrations are altered if the CAL or DEFAULT keys are not pressed. If
calibration is required, go on to step 3.
3. Select the AT parameter if not already selected. Measure the ambient temperature
with your reference standard device positioned near the BAM 1020 ambient
temperature probe. Enter the value from your reference standard into the STD field
using the arrow keys. Press the CAL soft key to calibrate the BAM reading. The
BAM
and STD temperature values should now be the same.
4. Press the
NEXT
key to select the BP field. Enter the barometric pressure value from
your reference standard into the STD field, and press the CAL soft key to calibrate the
BAM reading. The
BAM
and STD pressure values should now be the same.
5. After the temperature and pressure readings are both correct, remove the PM
10
head
from the inlet tube and install your reference flow meter onto the inlet tube. Press the
NEXT key to select the first flow point of 15.0 L/min. The pump will turn on
automatically.
Allow the BAM 1020 to regulate the flow until the BAM reading stabilizes
at the target flow rate
. Enter the flow value from your standard device into the STD
field using the arrow keys, then press the CAL soft key. Note:
The BAM flow reading
