Technical Manual | Dräger Polytron
®
8000 Series 73
Interface settings
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 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:
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 corre-
sponding to any measurement value
between 0 ppmand full scale deflec-
tion.
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