Requirements For Safe Operation; Regular Inspections - Labom CI4 Series Sil Instructions

3.2

Requirements for Safe Operation

Avoid unsafe operating conditions (see 3.1).
Ensure compatibility of wetted materials with process media and cleaning agents.
Avoid environmental conditions that exceed the data sheet limits.
Avoid a pressure load that exceeds the permissible pressure limits as per the data sheet.
Monitor both alarm states (< 3.6 mA or > 21 mA) regardless of the alarm function setting.
Avoid an excessive supply voltage above 30 V.
3.3

Regular Inspections

Hazardous undetected faults during operation can be detected with a high level of certain-
ty during regular inspections. The operator can define the inspection interval depending on
the PFD value required.
Not only the device but the complete measuring chain should be tested during inspection.
It is the responsibility of the plant operator to determine an adequate test of the safety
function.
The following inspection procedure is recommended for the device to achieve a high fault
detection.
 Set the current simulation to a value of ≤ 3.6 mA and check whether the current
output reaches this value
 Set the current simulation to a value of > 21 mA and check whether the current out-
put reaches this value
 Apply one or more pressure values - depending on the safety-related pressure
range - and check whether the current output corresponds to the applied pressure
 Visual monitoring of damage
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