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VDL (E3.1) 10/2020 Page 64/196
6.5.4 Note on the use of a flame arrester
A flame arrester is not mandatory for VDL applications (TRBS 2152-4:2012). A pump designed for Zone 1
is equipped with a temperature sensor on the bearing which, in the event of a fault, causes the pump to
shut down immediately.
In general: In case of a risk of ignition before or after the vacuum pump, the operator must provide suitable
flame arresters in accordance with EN 12874. The suitability (chemical resistance, sufficient flow and safety
against clogging) must be ensured before commissioning.
6.5.5 ATEX connection kit for vacuum pump VP4 (option)
Connection kit for VP4 (Art. no. 8012-0621) consists of:
• Straining ring DN10/16 (3 pc.)
• Universal centering ring DN10/16 (3 pc.)
• Transition piece, adapter DN 16-10/8 (2 pc.)
• Vacuum hose 10/8, 2 m / 78.7 in
• Union nut M14 (2 pc.)
• Elbow DN 10/10
For mounting the VDL connection kit for VP4, please refer to the mounting instructions Art.
no. 7001-0152 supplied with the connection kit.
6.6 Connecting inert gas supply
When operating the VDL vacuum drying oven with inert gas, correctly follow the technical ventilation
measures, as described in the DGUV guidelines 213-850 on safe working in laboratories, issued by the
employers’ liability insurance association (for Germany
When operating with inert gas, the chamber is supplied with an oxygen displacing gas, e.g., N
2
. Inert gases
in high concentrations are hazardous to health. They are colorless and almost odorless and therefore prac-
tically imperceptible. Inhalation of inert gases can cause drowsiness up to respiratory arrest. When the O
2
content of the air decreases below 18%, there is risk of death from lack of oxygen. Any gas that might
escape has to be led out via good room ventilation or a suitable exhaust system.
DANGER
Risk of suffocation by inert gas in a high concentration.
Death by suffocation.
∅ Do NOT set up chambers in non-ventilated recesses.
Ensure that technical ventilation measures are activated.
Respect the relevant regulations for handling inert gases.
When decommissioning the vacuum drying oven, turn off the inert gas supply.
Connect the inert gas supply to the inert gas connection (adapter with hose olive diameter 8 mm / 0.31 in)
via a pressure reducer. Screw the enclosed adapter with hose olive on the thread (4) at the chamber rear.
Set the pressure reducer to a pressure slightly above ambient pressure. Ensure that the pressure reducer
will certainly open. Do not alter this setting in order to avoid perturbation inside the oven and release of big
quantities of inert gas after flooding the VDL.
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