General Information; Safe Function; Validity; Technical Data - Labom CI4 Series Sil Instructions

1

General Information

These SIL Instructions contain information and instructions for using the device as part of
your protection system according to IEC/EN 61508. In addition to these instructions,
please take all relevant legal requirements, applicable standards as well as the additional
technical specifications
www.labom.com).
1.1

Safe Function

The safe function of the device according to IEC/EN 61508 is the 4...20 mA current signal.
1.2

Validity

The safe function can only be guaranteed if the option "Func-
tional safety according to IEC/EN 61508" has been chosen for
the device. These devices are marked as shown on the right.
2

Technical Data

The following technical data applies to the safe function of the device.
2.1

Accuracy

Assured accuracy in safe mode: 1%
For devices with diaphragm seal take the error of the diaphragm seal into account as well.
For devices with ATC-option the accuracy for devices without ATC-option applies only.
Please observe that for devices with operating software for level applications inaccurate
level parameters directly affect the accuracy of the level calculation. E. g. the less accurate
the density is set, the more the calculated level deviates from the actual level.
2.2

Reaction Times

 In the event of a request: 220 ms
 In the event of fault detection: 100 ms
Note that any set damping value can extend the reaction time in the event of a request.
Additional elements in the process connection, such as capillaries, can extend the reaction
time in the event of sudden pressure changes in the process.
2.3

Start-up Behaviour

A safe state is also guaranteed during initialisation or a phase of low voltage. After con-
necting the supply voltage, a current of < 3.6 mA (alarm current) is issued at the current
output. Following completion of initialisation, after about 5 seconds, the current output
jumps to a current proportional to the applied pressure or approaches the correct current
according to the set damping value.
SA_001_2019-07_10.00 Transmitter PASCAL Ci4
on the accompanying data sheet into
SIL marking on the unit.
account (see
Page 2/4