Pfm Electronic Insert Fei57S - Endress+Hauser Liquicap M FTI51 Operating Instructions Manual

Liquicap M FTI51
Endress+Hauser
Functional safety (SIL)
The electronic insert FEI55 meets the requirements of SIL2 or SIL3 in accordance with
IEC 61508, IEC 61511-1 and can be used in the safety systems with the corresponding
requirements.
An exact description of the requirements in terms of functional safety can be found in
document FY01072F.
5.3.6

PFM electronic insert FEI57S

The two-wire DC connection is used in conjunction with one of the following Nivotester
switching devices from Endress+Hauser:
FTC325 PFM, FTL325P
The PFM signal is between 17 to 185 Hz.
The failsafe mode (MIN) / (MAX) and the point level adjustment are configured on the
Nivotester.
 20 Frequency: 17 to 185 Hz
Power supply
• Supply voltage: 9.5 to 12.5 V
• Power consumption: < 150 mW
• Reverse polarity protection: yes
• Separation voltage: 0.5 kV
Output signal
PFM 17 to 185 Hz
Connectable load
• floating relay contacts in the connected switching unit Nivotester:
FTC325 PFM, FTL325P
• for the contact load capacity, refer to the technical data of the switching device
Do not switch on the supply voltage until you have learned about the device functions
as described in section "Operation option" →  37. This will ensure that you do not
accidentally trigger any processes by switching on the supply voltage.
Connecting the FEI57S
16 mA
8 mA
0 mA
DC
Electrical connection
t
A0040777
33