envea STACK 602, User Manual

Page: 44 / 68

9 Maintenance STACK 602
44
(PC-000848-MA Issue 5, December 2021)
ENVEA UK Ltd
2. Increase the Sensitivity from Low
→
Medium
→
High , until a signal
>12.5 is reached. Each sensitivity change will increase the reading by a
factor of 8.
3. Increase the Brightness % from 50% (up to max. 100%), ideally to reach a
level of between 80 and 100 . If this level cannot be reached, increase the
level to 100%.
NOTES
:
(i) If settings are at maximum level (for example, High sensitivity and 100% brightness)
and the signal still reads <25, then check the alignment of the sensor heads to
improve the signal level.
(ii) If the Set Up screen shows a fixed maximum level (reaching 118 on the bar chart),
the Receiver has become saturated. To correct this, lower the sensitivity and
brightness until the level drops.
(iii) It is recommended not to run with a brightness level of less than 50% because this
increases the level of Transmitter noise.
7.6 Calibration Factor (Cal Factor)
The Cal Factor is used to scale the raw dust reading to provide a mg/m³ reading
within the instrument. Alternatively, the raw dust reading can be output to your
own system (using analogue or Modbus outputs) and calibrated within that
system.
The Cal Factor scales the raw reading as follows:
Dust Reading (mg/m³) =
raw instrument reading x Calibration Factor
The Cal Factor is applied to:

The Multiple Device menu screen
 Logged data within the instrument (short term, via PC-ME DUST TOOLS
only)
 Analogue (4-20mA) outputs

Modbus RS-485 output values.
The default Cal Factor is
1.00
. The procedure to calculate the correct Cal Factor
is described in
Appendix B
on page
61
.
NOTE
: When the Cal Factor is adjusted, the new Cal Factor is only applied to newly logged
data. Existing logged data remains calibrated to the old Cal Factor. The control unit
maintains a history of Cal Factor changes for use by the PC-ME DUST TOOLS
software.
7.6.1 Advanced Settings
For information on more advanced sensor/device settings, refer to the relevant
control unit manual (see
Related Documentation
on page
11
).