Leaky Gas Connections - Siemens SIPROCESS GA700 Compact Operating Instructions

Connecting
4.4 Gas connections
Sample gases
When measuring toxic or corrosive gases, the gas path may start to leak and sample gas can
accumulate in the device. This means devices used in hazardous areas must be purged with air
or inert gas. The gas discharged by purging must be routed via an exhaust gas line for
environmentally-friendly disposal.
During the operation of wall-mounted devices with Ex ec or Ex t type of protection:
• Do not introduce gases which have toxic, corrosive or flammable components in potentially
dangerous concentrations.
Common exhaust gas line
When the sample gas is removed into a collective exhaust line, observe the following points:
• The exhaust gas line must be free of "rapid" pressure fluctuations. If such pressure
fluctuations are present, implement appropriate remedial measures:
– Install a special exhaust line.
– Adjust diameter of combined exhaust line to prevent build up of dynamic pressure.
– Alternatively: Install a damping vessel (> 1 l) between the device and the exhaust line.
• Water can condensate in the exhaust line.
– Therefore, install the exhaust line as vertical as possible.
See also
Technical data (Page 87)
4.4.2

Leaky gas connections

NOTICE
Leaky gas connections
A gas-tight connection cannot be achieved if you install the clamping ring connections before
a sample gas restrictor or clamping screw was screwed onto the connecting socket. The gas
connection is irreversibly leaky.
• Observe the information provided by the manufacturer of the clamping screws. Observe the
• Before you install the clamping ring connections, make sure that the connecting socket is
• Tighten the clamping screws in accordance with the mounting specifications of the
42
installation guidelines.
either equipped with a sample gas restrictor or with a clamping screw.
manufacturer using a suitable open-ended wrench. In the process, make sure that you
counter properly.
SIPROCESS GA700 rack and wall mounted devices
Compact Operating Instructions, 06/2023, A5E35134047-AB