Installation And Commissioning; Proof Test; Checking The Function; Maintenance - Knick ProLine P22400 Mode D'emploi

30

Installation and Commissioning

The notes, conditions, and limit values specified in this user manual must be
observed during installation and operation of the loop-powered isolators.
• Mount the loop-powered isolator on a DIN rail (35 mm).
• Connect the loop-powered isolator according to the selected wiring
(see page 23).
• Check the loop-powered isolator for correct function (see below).

Proof Test

The proof test is used to detect failures in a safety-related system. The correct func-
tioning of the loop-powered isolators must therefore be checked at appropriate
intervals.
It is the responsibility of the operating company to choose the type of testing and
the test intervals. The test intervals are determined, for example, when calculating
the individual safety loops of a plant (PFD values).
The test must be carried out in a manner that verifies the flawless operation of the
safety functions in conjunction with all components.

Checking the Function

The documented PFD values apply to the test intervals T
The correct functioning of the loop-powered isolator must be checked in the
application. Proceed as follows:
• Adjust values for start and end of range and an average value (e.g., 50% value).
Check if the measurement error lies within the specified tolerances.
• Verify the transition to the safe state. This test is preferably carried out by simulat-
ing an open circuit (open input). The output must then sink to a value ≤ 3.6 mA.
If the functional test proves negative, the loop-powered isolator must be taken out
of service and the process be held in a safe state by means of other measures.
The loop-powered isolator itself is maintenance-free.

Maintenance

The series P224xx P1 loop-powered isolators are maintenance-free.

Repair

Please send defective units to the address named by our Knick Service Team.
A defective unit is to be replaced with a replacement unit of the same type within
72 hours.
SIL Safety Manual
= 1, 2 or 3 years.
1