KROHNE OPTIWAVE 5200C SIL - Manual (Page 12)

6
SPECIFICATION OF SAFETY FUNCTION
12
OPTIWAVE 5200 C
www.krohne.com 02/2013 - 4001906202 - AD SIL OPTIWAVE 5200 R02 en
6.2.3 Safety function characteristics
The safety function uses only a 4...20 mA analog output signal to measure the level and give the
device status. The analog output signal has an accuracy of ±2.5%.
If the device finds a fault:
If a logic solver is used, it must use low error alarm signals (current input ≤ 3.6 mA ) to set itself
to a fail-safe condition.
WARNING!
The device must have the applicable options and settings for the application. The ambient and
process conditions must agree with the technical data given in the handbook (document [N1])
and this document (safety manual). You must obey the installation instructions given in the
handbook (document [N1]).
CAUTION!
We recommend that the 4 and 20 mA limits of the measuring range are not in the top dead zone
(100 mm / 3.9
¨ below the antenna).
The shape of the tank bottom can have a large effect on the accuracy when the tank is almost
empty. We recommend that device is not used to measure the liquid when it is less than 300 mm
from the bottom of the tank.
For more data about the top dead zone, refer to the "Operation" and "Technical Data" chapters in
the handbook (document [N1]).
Function input Function input Function input Function input None
Function output Function output Function output Function output 4…20 mA
Error signal Error signal Error signal Error signal ≤ 3.6 mA