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VDL (E3.1) 10/2020 Page 62/196
Defining the zone of the installation site of the vacuum pump (Directive 1999/92/EC)
If the pump module is defined as Zone 1, the operating chamber of the vacuum pump must be swept with
inert gas. A flow of at least 1 liter per minute (without pressure) is needed. For Zone 2 or without any zone
sweeping with inert gas is not required. In addition to sweeping with inert gas, in case of condensing media,
you can connect a gas ballast in order to avoid condensation.
The ATEX Directive 2014/34/EU compliant vacuum pump offered by BINDER is designed for a gas
inlet temperature of 40 °C / 104 °F max. Do NOT exceed this temperature. If the gas inlet temperature is
too high and then becomes even warmer by compression in the pump, the resulting temperature (of the
gas-solvent mixture inside the pump) could exceed the solvent’s temperature class and auto-ignition tem-
perature.
DANGER
Fire and explosion hazard due to exceeding the solvent’s auto-ignition temperature
by exceeding the gas inlet temperature.
Damage to the vacuum pump. Serious injury or death from burns and / or explosion
pressure.
Do NOT exceed the set-point temperature 40 °C / 104 °F.
With a set-point temperature above 40 °C / 104 °F, take appropriate measures to cool
down the sucked-in gas before its entry to the vacuum pump.
The maximum permissible ambient temperature of the vacuum pumps supplied by BINDER is 40 °C /
104 °F.
6.5.3 Installation of the vacuum pump VP4 in the pump module (option)
Avoid the solvent accumulation in the pump module as this would cause the pump module to
become an occasionally or continuously / for long periods / frequently potentially explosive
area (Zone 0 or 1). The VDL vacuum drying oven located on top of the module is constructed
in device category 3 in regards to its surroundings.
Installation of the supplied vacuum pump
• The vacuum drying oven is mounted onto the pump module as described in the mounting instructions
Art. No. 7001-0137.
• The suction line to the pump module is installed as described in the mounting instructions Art. No. 7001-
0137. Connect the vacuum connection (6) (small flange DN 16) on the back of the chamber to a vacuum
suction lead. When using a vacuum tube BINDER recommends the BINDER connection kit for VP4
(chap. 6.5.5). The optional pump module has a corresponding hose outlet on its rear.
• When the pump is removed from the original packaging, place it in the pump module.
• Connect the grounding elements as described in the mounting instructions Art. no. 7001-0137.
• Connect the pre-installed suction line to the vacuum pump inlet at the suction-side small flange connec-
tion located at the top of the condensate catchpot).
• Connect a conduit that is suitable for removing the extracted vapors from the pump module, onto the
pressure-side connection of the vacuum pump (hose olive on the top-back of the emission condenser).
• Guide the end of the conduit into an exhaust air system, which is explosion-proof constructed in consid-
eration of any possible residual solvent contents. The operator must check if an explosive atmosphere
may be present at the pump exit or at the exhaust waste vapor condenser. For this purpose, use a
calculation of the solvent’s partial pressure at the set-up coolant temperature of the exhaust waste vapor
condenser and compare it to the explosion limits of the pumped solvent. The exhaust solvent concen-
tration should be minimized by selecting the most appropriate condensation temperature for the solvent
at the refrigeration plant that can be connected to the exhaust waste vapor condenser.
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