32
7
Instructions on Commissioning and Maintenance
7.2.4.3 Measuring Points
Apart from the Adjust function, the measuring points (refer to chapter
) of the device can be used. This allows to continuously measure the unevalu-
ated intensity. The measured resistance should be> 5 MOhm.
WARNING!
Connect only potential free measuring equipment/devices to the testing terminals.
The measuring equipment/devices must provide a reliable separation of the measuring circuit
to hazardous active parts, according to EN 61140 e.g. by double or reinforced insulation ac-
cording to EN 61010-1 (e.g. a standard handheld multi meter).
The trigger threshold for the F200K is at = 25 mVAC, while the measured signal voltage
can amount to maximally 3 VAC.
To allow an
optimum suppression
of reflections, the measured values should be clearly be-
low the specified value of 25 mVAC of the response threshold after burner switch-off.
See also table in chapter
7.2.4.2 Alignment with Adjustment Function
7.2.4.4 Frequency Settings
An adaptation to the burner flame can additionally be configured in the F200K2 (ex-proof) as
to the lower frequency limit (chapter
9.1.2 F200K2... (Ex-proof), in the State as Delivered
).
This frequency allows no remote switch-over. Generally, a low frequency limit means a higher
availability, a reduction of the selectivity. 3 levels are provided for (10, 20 and 30 Hz).
CAUTION!
The
setting
(changeover to another frequency range) has always to be carried out for both
processing channels
A and B in an identical way
. Always ensure that
only one
frequency
range (Channel A + B) is in the
ON
position is selected each time.
