Interfaces 4-23, Control location, Recorder outputs – INFICON Protec P3000(XL) Helium Leak Detector User Manual
Page 78: 5 interfaces, 1 control location, 2 recorder outputs, Examples
4-23
Equipment Settings
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in
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4.5
Interfaces
In the I
NTERFACES
submenu the
CONTROL
LOCATION
, the
RECORDER
OUTPUTS
. the
PLC
inputs, the RS232
PROTOCOL
and the B
AUD
RATE
&
END
SIGN
can be edited.
4.5.1
Control location
The
CONTROL
LOCATION
can be “
LOCAL
”, “RS232” or “
LOCAL
AND
RS232”. In
LOCAL
mode the RS232 interface can only be used to read data, but not for control
purposes. In RS232 mode, the Zero and Cal functions are controled solely via the
interface. In
LOCAL
AND
RS232 mode the Protec P3000 can be controlled via the
interface but also by input from the main display.
Default setting: local and RS232
Notice
Even with the control location set to RS232 some parameter may still be
able to be changed through the main units software menues. Please lock
these by activating the menu PIN to prevent unitended changes.
4.5.2
Recorder outputs
The
RECORDER
OUTPUT
SCALE
is linear and logarithmic. The linear output signal is
provided through channel 1 (pin 1 of the I/O port) and the logarithmic output is
provided through channel 2 (Pin 14 of the I/O port) (see Section
In logarithmic output scale the voltage range is 0 - 10 V. Beginning at 1V, each leak
rate decade is spread over 2 volts, i.e.:
1…3V: 1
st
decade
3…5V: 2
nd
decade
5…7V: 3
rd
decade
7…9V: 4
th
decade
Thus a leak rate range of 4 decades will be output by way of an analog signal. The
four decades are set through the value and the unit of measurement for the trigger
level. The software of the Protec P3000 will set the output voltage in such a manner
that the trigger level itself will always be set within the second decade (i.e. within the
range of 3 to 5 Volts).
Examples:
The following table has been provided to clarify the way in which the output voltage
represents the leak rate.
Trigger level
Output voltage (1 to 9V) will correspond to
3 g/a
0.1 to 1000 g/a
0.2 oz/yr
0.01 to 100 oz/yr
5 x 10
-4
mbar l/s
1x10
-5
to 1x10
-1
mbar l/s