Snifter mA+ EX RF User Manual 14
8 AUTO-SETUP
To be able to detect variations in dust follow, and to set the alarm so that it will go
off if there is excessive dost flow, you must determine the typical dust flow in the
application when the process is operating normally.
The unit has an auto-setup function. With this, you can set the measuring range of
the dust monitor so that a typical dust flow in the application corresponds 5% (4.8
mA) of the output scale.
Before running the auto-setup it is necessary to know that the process is running
with normal dust flow. When initiated, auto-setup sets the dust measuring
parameters based on the normal dust flow.
After the auto-setup, by default alarm signals are set as follows:
• alert when the dust concentration exceeds 5 times the typical dust level.
• alarm when the dust concentration exceeds 20 times typical dust level.
In addition, the following key parameters will also be affected.
• 4 -20 mA high level is set to 20 times typical dust level and low level is set to 0
• Dust signal averaging time is set to default.
• Signal hysteresis and delay times are set to default.
For more information, see Table 3 Default operating configuration on factory
settings.
NOTE
As the auto-setup procedure can also be altered by the user, this section only
describes the actions of factory default auto-setup.
8.1 How to do the auto-setup?
Follow the procedure below to run the auto-setup.
1. Connect the sensor to the duct, connect the power to the device and wait for
10 minutes the process to stabilize.
1. Then start the auto-setup procedure either:
1.1 by connecting the automatic setup signal (green wire) to the V+ signal
(wire) for a period of 1 second. The automatic setup will initiate and
the front panel light will start to blink slowly (sequence D in Figure 5
Description of Snifter mA+ EX RF cover illumination sequences.).
Then Release the automatic setup signal, by disconnecting the green
wire from V+.
To Next Page
Loading...