22 Dräger Polytron 8700/8720
Settings menu
Setting the warning current
This function is used to define the current for the warning
signal on the analog interface.
1. Select Settings > Communication > Analog interface >
Warning current and confirm.
2. Select the current line for the entry and confirm.
3. Set the currrent and confirm.
The setting for the warning current is displayed.
4. Select Confirm and confirm.
Changing the maintenance signal type
This function is defines the type of signal used on the analog
interface for the maintenance signal.
1. Select Settings > Communication > Analog interface >
Maint. signal and confirm.
2. Select static or dynamic signal type and bestätigen.
Setting the maintenance current
This function is used to define the current for the maintenance
signal on the analog interface.
1. Select Settings > Communication > Analog interface >
Maint. current and confirm.
2. Select the current line for the entry and confirm.
3. Set the currrent and confirm.
The setting for the maintenance current is displayed.
4. Select Confirm and confirm.
Switching Beam Block on or off (for PIR 7000/7200 only)
If the Beam Block signal is enabled and the optical surfaces of
the PIR 7000 or PIR 7200 are dirty, a Beam Block signal will be
output over the analog output of the transmitter. In the case of
a high and potentially dangerous gas concentration of more
than 15 % LEL (PIR 7000) or 15 % of the full-scale reading
(PIR7200), the device will switch back to the normal measuring
mode. If the contamination on the surfaces increases and
correct measurement is not possible, the device transmits
a fault signal.
1. Select Settings > Communication > Analog interface >
Beamblock on/off and confirm.
2. Select On or Off and confirm.
Setting the beam block current (for PIR 7000/7200 only)
This function is used to define the current for the beam block
signal on the analog interface.
1. Select Settings > Communication > Analog interface >
Beambl. current and confirm.
2. Select the current line for the entry and confirm.
3. Set the currrent and confirm.
The setting for the beam block current is displayed.
4. Select Confirm and confirm.
Setting the 4-20 mA offset
This function can be used to set an adjustable offset current on
the analog interface. The offset is constant over the entire
range of the output signal.
1. Select Settings > Communication > Analog interface >
Analog offset and confirm.
2. Select the current line for the entry (max. range: -0.2 to
1.5 mA) and confirm.
3. Set the currrent and confirm.
The setting for the 4-20 mA offset is displayed.
4. Select Confirm and confirm.
NOTICE
The static signal type is a constant current. The current
can be configured.
The dynamic signal type is a square wave signal with
the following characteristics:
0533300.eps
t
[s]
T
1
4
20
[mA]
T
2
3
i
i
0633300.eps
t
[s]
1,1
[mA]
0,7
5
3
NOTICE
The maintenance current can only be set if the
maintenance signal has been set to static. This function
is not available otherwise.
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