Personnel Qualification; Personal Protective Equipment - WIKA MH-3 Betriebsanleitung

3. Safety
Specific notes based on the medium hydrogen (model MH-3-HY)
The sensor offered uses the wetted materials 2.4711 and 1.4404. These materials are
resistant to hydrogen embrittlement.
With a temperature of up to 30 °C, the stability under hydrogen influence is typically
EN
1 %/year, maximum 3 %/year.
Due to hydrogen diffusion into the sensor structures, a signal drift can occur dependent
upon the time. The time until the occurrence of a relevant signal drift and the size of the
signal drift depends mainly on factors such as the temperature of the hydrogen, hydro-
gen content in the medium, and the diaphragm thickness of the pressure sensor used.
It is explicitly recommended for the user to test the selected product version for suitabili-
ty in the intended application(s) with the specified ambient conditions.

1.3 Personnel qualification

Skilled personnel
Skilled personnel, authorised by the operator, are understood to be personnel who,
based on their technical training, knowledge of measurement and control technolo-
gy and on their experience and knowledge of country-specific regulations, current
standards and directives, are capable of carrying out the work described and indepen-
dently recognising potential hazards.

3.1 Personal protective equipment

The personal protective equipment is designed to protect the skilled personnel from
hazards that could impair their safety or health during work. When carrying out the
various tasks on and with the instrument, the skilled personnel must wear personal
protective equipment.
Follow the instructions displayed in the work area regarding personal protective
equipment!
The requisite personal protective equipment must be provided by the operating company.
WIKA operating instructions, OEM pressure sensor, model MH-3 7