![background image](http://html.mh-extra.com/html/aeroqual/aqs-1/aqs-1_user-manual_2862866056.webp)
MRK-D-0048 V4
Aeroqual Dust Sentry / AQS User Guide
Page | 56
8.1.6
If the values are stable but outside the acceptable range listed in Table 8 Column 8.1.5 (b)
then a new gain must be calculated and applied. Calculate and record new Ox gain using
Equation 5.
New Gain = Current Gain x (Span concentration / Gas reading)
You can use the calibration app “Recommend” button (Figure 5-3), this will perform the gain
calculation but you must accept this gain by pushing the “Apply” button, this will upload the
new gain.
NOTE: The calibration app restricts the gain between 0.2 and 5.0. The manual entry screen will allow
the gain to be set outside these limits.
8.1.7
Calculate and record the ratio of the gain change by using Equation 6. Record the ratio in
Table 8, column 8.1.7.
Gain Change Ratio = New Gain / Current Gain
8.1.8
If the calculated gain is within acceptable limits listed in Table 8 Column 8.1.5 (d), upload the
new gain.
If the required gain is outside the recommend limits do not upload the gain, write
fail
in the
column 8.1.10. Move on to next module and
go to Step 8.1.1.
8.1.9
Record the O
x
readings after the new O
x
gain has been uploaded. Confirm the readings are
within acceptable limits.
If yes then write
pass
in column 8.1.10, if no then
fail
. Move on to next module and
go to
Step 8.1.1.
8.1.10 Deliver zero air for 10 minutes to purge the gas lines.
NOTE: Change the gas connection from the AirCal 1000 over to the Ozone calibrator. Make sure to
cap the end of the tee as shown in Figure 5-5.
8.1.11 Deliver ozone from the ozone calibrator at your chosen span point, Aeroqual recommends 0.1
ppm, make sure the tee is closed using the cap as shown in Figure 5-5.
NOTE: It takes a while for the ozone delivery to stabilise at the chosen span point, you should have
previously set the output of the ozone generator to your chosen span point and left the
generator running at this span point for at least 30 mins, to allow the output to stabilise.
8.1.12 Record the ozone span concentration in Table 8 Column 8.1.3.
8.1.13 Wait for the O
3
values to stabilise towards O
3
calibration gas, as described in Table 8 Column
8.1.5 (c) If the values have not stabilised then write
fail
in the last column.
NOTE: If the O
3
module fails calibration then the NO
2
measurement cannot be used.
8.1.14 Record the stabilised
O
3
values
in Table 8 Column 8.1.5 from the 10 minute average. If the
values are stable and within the accepted range listed in Table 8 column 8.1.5 (b), then no
gain change is required, then write
pass
in column 8.1.10.
8.1.15 If the values are stable but outside the acceptable range Calculate and record new O
3
gain
using Equation 5.
New Gain = Current Gain x (Span concentration / Gas reading)
You can use the calibration app “Recommend” button (Figure 5-3), this will perform the gain
calculation but you must accept this gain by pushing the “Apply” button, this will upload the
new gain.
8.1.16 Wait for the
O
x
values
to stabilise towards O
3
calibration gas. After the O
x
values have
stabilised calculate the
a
value. The
a
value is calculated according to this equation:
a = Ox reading / O3 span concentration
The
a
value should be in the range 0.3 to 1.5. If your calculated
a
value falls outside this
range do not change the a value, contact Aeroqual for technical support:
.
8.1.17 Upload the
a
value in the manual entry screen shown in Figure 5-4. Record the new
a
value
in Table 8 column 8.16b.
8.1.18
After the O
x
and O
3
gains, and the a value have been applied
, record the NO
2
readings in
Table 8 Column 8.1.9. Do not adjust any calibration settings of the NO
2
channel.
8.1.19 Turn off the Ozone gas and return the monitor sampling zero air from the AirCal 1000.
NOTE:
Change the gas connection from the Ozone calibrator over to the AirCal 1000 calibrator.
Make sure to remove the cap from the end of the tee as shown in Figure 5-6.