envea STACK 602, User Manual

Page: 42 / 68

9 Maintenance STACK 602
42
(PC-000848-MA Issue 5, December 2021)
ENVEA UK Ltd
7.4.1 Sensor Channels
For each STACK 602 sensor, the following channels are added to the control unit
automatically. Switch to the
Multiple Devices screen to view these.
Channel Description
1
Dust Dynamic opacity reading (can be calibrated in mg/m³)
2
Opacity
Opacity reading in % (0% = clear stack, 100% = obscured
stack)
3
I Total light intensity (diagnostic only)
4
SC Scintillation count (diagnostic only)
5
Tx Temp Transmitter PCB temperature (diagnostic only)
6
Rx Temp Receiver PCB temperature (diagnostic only)
The STACK 602 optical sensor has two outputs: Dynamic Opacity mode and
Opacity mode. The Dynamic Opacity mode is equivalent to a ‘Dust’ reading. If
either mode (602 Dust / 602 Opacity) is not required, this can be deleted manually
from the control unit.
7.5 Adjust Sensor Brightness and Sensitivity
To set up the STACK 602, the brightness and sensitivity settings must be adjusted,
so an appropriate Received Light signal is being detected at the Receiver.
CAUTION!
Adjustments to the sensor sensitivity and/or brightness affect
the Dust calibration.
Neither sensitivity nor brightness settings should be changed once the
STACK 602 has been calibrated. The settings should be noted during
the calibration procedure (see section
7.6
on page
44
).
1. Referring to
Figure 21
below, select the QA/Self Tests icon to display this
screen.
2. From the Device list, select Stack n Opacity .
3. Select the Set Up button (top right) and press ENTER to display this screen.
NOTES
: Sensitivity and brightness settings can be set automatically or manually. It is
recommended to set the brightness and sensitivity automatically using the
AUTOSET function (see below)
.
7.5.1 Adjusting Sensitivity/Brightness Automatically (Autoset)
1. Referring to
Figure 21
below, select the Autoset button and press ENTER.
2. Select the Sensitivity button and press ENTER to increase the setting from
Low to Medium / High until a sufficiently large Received Light signal is
reached ( >12.5 , on the bar chart).