Scope - Samson 3730-3 Safety Manual

Scope

1 Scope
General
The Type 3730-3 Electropneumatic Positioner is a single-acting, venting positioner with
HART communication for attachment to pneumatic rotary and linear actuators with
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spring-return mechanism. The positioner is used to position control valves.
Use in safety-instrumented systems
Observing the requirements of IEC 61508, the systematic capability of the pilot valve for
emergency venting as a component in safety-instrumented systems is given.
Use of the positioner is possible on observing the requirements of IEC 61511 and the re-
quired hardware fault tolerance in safety-instrumented systems up to SIL 2 (single device/
HFT = 0) and SIL 3 (redundant configuration/HFT = 1).
The individual safety functions of the positioner are to be regarded as Type A elements in ac-
cordance with IEC 61508-2.
Note
The architecture and the interval between proof tests must be changed accordingly for a
higher safety integrity level.
Versions and ordering data
Apart from the low-temperature version with metal cable gland, all versions of the
Type 3730-3 Positioner are suitable for use in safety-instrumented systems. However, the op-
tional equipment affects the safety-related behavior of the positioner. These options are the
inductive limit contact SJ2-SN and the solenoid valve.
The article code written on the nameplate provides details on the optional equipment of the
positioner:
SH 8384-3 EN 5