Instruction Manual Version Page
M-Flow mflow_D5_0 © Vögtlin Instruments GmbH 07
Predictable risks
Before commissioning the system, the operator must take appropriate precautions to ensure that
the environment and/or persons are protected in the event of a fault.
Leakage of the control valves can result in the following risks:
- Escaping gas can be suffocating, toxic and/or corrosive. Please read the safety data sheet
of the used gas or gas mixture from the respective gas supplier carefully beforehand.
- When flammable gases escape, an explosive gas mixture can form in the environment.
- In the case of aggressive media, leakage can lead to corrosion damage to the device
and/or in the immediate vicinity.
The following causes can lead to gas leakage:
- The valve becomes leaky because it is operated with a gas which was not intended for this
purpose at the origin. As a result, gas may leak if the seals are not resistant to this gas.
- The process connections are not tight due to improper installation. A leak test must be
carried out before commissioning.
The possible causes of gas leakage are not conclusive and may have other causes as well.
Corrosive Gases
The operator is solely responsible for the safe operation of the system and takes precautions to
protect the environment and/or persons in the event of leaks.
The valve may only be operated with the gases for which the valve has been designed and
specified.
Sealing materials for corrosive gases
The manufacturer shall propose the sealing material suitable for the specified gas. The data on
resistance are taken from the literature of our suppliers. Therefore, we cannot guarantee the
specified sealing material.
Operation with ozone gas (O3)
The durability of the sealing material depends strongly on the operating conditions.
In ozone applications, concentration, humidity and temperature have a decisive influence on the
resistance of the sealing material used.
Vögtlin Instruments only supplies a device for O3 if the customer/plant operator himself determines
the sealing material.
The same applies to unknown media and gas mixtures.
