Interface settings
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en
Instructions for use
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Dräger PointGard 2000 Series
25
2. Set the current and confirm.
13.1.9 Setting analog offset
This function adds an offset to the analog output at 4 mA. The
offset adjusts the current at 4 mA without affecting the 20 mA
set point.
1. Select
Settings
>
Communication
>
Analog interface
>
Analog offset
and confirm.
2. Select the line for editing the offset (range: -0.5 to 0.5mA)
and confirm.
3. Set the current and confirm.
The setting for the
Analog offset
is displayed.
4. Select
Confirm
and confirm with [OK].
13.1.10 Setting analog span
This function adjusts the analog output at 20 mA without
affecting the 4 mA set point.
1. Select
Settings
>
Communication
>
Analog interface
>
Analog span
and confirm.
2. Select the line for editing the offset (range: -0.5 to 0.5mA)
and confirm.
3. Set the current and confirm.
The setting for the
Analog span
is displayed.
4. Select
Confirm
and confirm with [OK].
13.1.11 Testing the analog interface
These functions change the current of the analog interface for
test purposes (e.g. to check the programming of the control
unit). It might be necessary to inhibit the alarms at the control
unit to avoid false alarms. After exiting these functions, the
currents automatically return to the maintenance signal.
During the test, the maintenance symbol is displayed.
●
To set current or concentration:
1. Select
Settings
>
Communication
>
Analog interface
and the desired option.
2. Once the alarms at the control unit are inhibited, confirm
the message
Inhibit all alarms
with
Next
.
3. Select the line for editing and confirm with [OK].
4. Set the desired value.
5. Select
Next
and confirm.
6. Select the desired option:
7. Select
Next
and confirm.
The function is aborted.
8. Once the alarms at the control unit are enabled again,
confirm the message
Enable all alarms
.
●
To set a test signal:
1. Select
Settings
>
Communication
>
Analog interface
and the desired test.
2. Once the alarms at the control unit are inhibited, confirm
the message
Inhibit all alarms
.
3. Select
Enable
or
Disable
and confirm.
13.1.12 Beam block
This function is only available for PointGard 27x0 IR (using
the sensor PIR 7x00).
The factory default setting for the beam block function is off.
If turned On, the beam block signal will be transmitted on the
analog interface if the optics of the PIR 7x00 sensor is “dirty”.
The optics of the PIR 7x00 can become “dirty” if there is a
build-up of deposits on the optical surfaces. However, if the
gas concentration rises to a level above beam block limit, the
instrument returns to normal operation.
If the build-up of deposits on the optical surfaces increases
beyond the point where a measurement is possible, the
instrument will go into fault.
●
To set beam block signals on/off:
1. Select
Settings
>
Communication
>
Analog interface
and the desired option.
2. Select
Enable
or
Disable
and confirm.
●
To set beam block signals:
1. Select
Settings
>
Communication
>
Analog interface
and the desired option.
Set Current
This function sets the current
to any value between 0 and
22 mA. Analog offset and
analog span are not used for
this function.
Set concentr.
This function sets the current
corresponding to any mea-
surement value between
0 and full scale deflection.
Set concentr. out
/
set current out
This function sets the preset
measurement value or cur-
rent test value.
During the test, the mainte-
nance symbol is displayed.
concentration off
/
current off
This function aborts the
transmission of the preset
test value.
Set fault
Sets the current to the fault
current.
Set warning
Sets the current to the warn-
ing current.
Set mainten.
Sets the current to the main-
tenance current.
Beamblock on/off
This function switches the
beam block on or off
Set beamblock
This function sets the current
to the beam block warning
current
