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Interface settings
12.1.1 Full scale deflection
®
Polytron
8100 EC, 87x0 IR and 8200 CAT LC only
Some sensors offer an adjustable full scale deflection to limit
the measuring range for the 4-20 mA interface.
The full scale deflection (FSD) sets an endpoint within the
measuring range of the sensor. If the gas concentration
reaches this endpoint, the 4-20mA interface transmits 20mA.
Example: Required range 0 to 500 ppm CO (e.g. part number
6809605 default 300 ppm, range min/max = 50/1000
ppm).Select full scale deflection as 500 ppm. The analog
output will be linear between 4 mA = 0 ppm and 20 mA = 500
ppm.
12.1.2 Setting fault current
This function defines the current for the fault signal.
1. Select Settings > Communication > Analog interface
>Fault current and confirm.
2. Select the line for editing the current and confirm.
3. Set the current and confirm.
The setting for the Fault current is displayed.
4. Select Confirm and confirm with [OK].
12.1.3 Information regarding the warning signal
To transmit a warning signal via the analog interface, it must
be switched on.
The warning signal alternates between the warning current
and the measurement current.
– Warning current (interval T2)
– Measurement current (interval T1-T2)
Time intervals and the warning current are configurable.
[mA]
20
4
3
T
T
1
12.1.4 Switching the warning signal on or off
1. Select Settings > Communication > Analog interface >
Warning and confirm.
2. Select Enable or Disable and confirm.
12.1.5 Setting warning interval
1. Select Settings > Communication > Analog interface >
Warning interval and confirm.
2. Set times for warning intervals T1 and T2 and confirm.
12.1.6 Setting warning current
1. Select Settings > Communication > Analog interface >
Warning current and confirm.
2. Set the current and confirm with [OK].
34
t
[s]
2
12.1.7 Setting the warnings of the Dräger
SensorAlive
This menu can be used to set various parameters of the
warning current:
● To set the warning current, select Settings >
Communication > Analog interface > DSA warn
current and enter the value.
● To set the threshold value for the warning, select Settings
> Communication > Analog interface > DSA warn limit
and enter the value.
● To enable or disable the warning, select Settings >
Communication > Analog interface > Set DSA warning
and confirm.
Select Enable or Disable and confirm.
12.1.8 Setting maintenance signal
1. Select Settings > Communication > Analog interface >
Maint. signal and confirm.
2. Set the signal type and confirm.
static
dynamic
12.1.9 Setting the 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.
12.1.10 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].
12.1.11 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.
Instructions for use
|
Dräger Polytron
A constant current that can be configured.
A square wave signal with the following
characteristics:
[mA]
5
3
0,7
1,1
®
8000 Series SW version ≥ 4.0.x
t
[s]
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