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.