Product Description; Functional Safety; Relevant Standards; Conformity - HYDAC ELECTRONIC HLT 1000 Mode D'emploi

3 Product description

The linear position transducer series HLT 1000 has been specially developed for OEM
hydraulic cylinders, e.g. in mobile applications, and provides reliable monitoring of the
piston rod position in hydraulic cylinders.
The HLT 1000 is based on the robust, long-lasting and wear-free principle of
magnetostriction. The housing shape and the geometry are designed in such a way
that it is impossible to install it incorrectly in the cylinder.
An analogue current output is available for incorporation in modern controls. As
regards the mechanical installation, there are two models with different housing
geometries. This means that the HLT 1000 can be used in a wide variety of
applications.
The HLT 1000-FS linear position transducer is specially designed for use in safety
circuits/safety functions as part of the functional safety of machines up to SIL2 (IEC
61508) or PL = 'd' Cat 2 (DIN EN ISO 13849-1:2008). The linear position transducer is
designed to be a sensor element (SRP/CS) on electronic control systems (E/E/PE
system).

4 Functional safety

4.1

Relevant standards

Performance Level
DIN EN ISO 13849-1: 2008-12
Safety of machinery – Safety-related parts of control systems -
Part 1: General principles for design
Safety integrity level
DIN EN 61508: 2001
4.2

Conformity

Conformity to the relevant standards is certified by TÜV Nord in
certificate no: 44 207 12 388991.
4.3

Description of the safety functions

The linear position transducer has just one safety function:
The safety function of the linear position transducer consists in transmitting at any time
an output signal based on the distance to the magnet position within the specified
measuring accuracy, within the specified operating conditions and input parameters.
In case of internal error detection, the linear position transducer goes into the "safe
state".

4.3.1 Normal operation

Normal operation is characterized by a permanent output signal in the range
4 ... 20 mA.
5