Setting Static Maintenance Current; Setting Analog Offset; Setting Analog Span; Testing The Analog Interface - Dräger Polytron 8000 Serie Instructions For Use

2. Set the signal type and confirm.
static A constant current that can be configured.
dynamic A square wave signal with the following
characteristics:
[mA]
5
3

13.1.8 Setting static maintenance current

The maintenance current can only be set if the maintenance
signal has been set to static.
1. Select Settings > Communication > Analog interface
>Maint. current and confirm.
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 0.5 mA,
SIL: -0.1 to 0.1) 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 0.5 mA,
SIL: -0.1 to 0.1) 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
● To set current or concentration:
1. Select Settings > Communication > Analog interface
and the desired option.
Dräger Polytron
0,7 t
[s]
1,1
is displayed.
®
8000 Series
Set Current
Set concentr.
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:
Set concentr. out /
set current out
concentration off /
current off
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.
Set fault
Set warning
Set mainten.
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 Polytron
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.
Interface settings
This function sets the current
to any value between 0 and
22 mA. Analog offset and
analog span are not used for
this function.
This function sets the current
corresponding to any mea-
surement value between
0 and full scale deflection.
This function sets the preset
measurement value or cur-
rent test value.
During the test, the mainte-
nance symbol is displayed.
This function aborts the
transmission of the preset
test value.
Sets the current to the fault
current.
Sets the current to the warn-
ing current.
Sets the current to the main-
tenance current.
®
87x0 IR (using the
en