Manufacturer's Safety Plan: Protective Measures And Equipment - Binder VDL Series Operating Manual

Material
The inner chamber is made of especially corrosion resistant stainless steel V4A (German material no.
1.4404, US equivalent AISI 316L) micro-polished. The rack holder and all of the chamber's vacuum
connections and valves are made of especially corrosion resistant stainless steel V4A (German material
no. 1.4571, US equivalent AISI 316Ti). The housing is RAL 7035 powder-coated. All corners and edges
of the housing are also completely coated. When operating the chamber at temperatures above 150 °C /
302 °F, the impact of the oxygen in the air may cause discoloration of the metallic surfaces (yellowish-
brown or blue) by natural oxidation processes. These colorations are harmless and will in no way impair
the function or quality of the chamber.
The chambers are jacket-heated. The preheating chamber technique ensures a completely homogene-
ous jacket temperature, ensuring uniform heat transfer into the inner chamber. The low-loss heat transfer
to the material uses the aluminum vacuum expansion racks (or optionally available in stainless steel). The
elastic-mounted safety glass window reliably compensates any overpressure or explosions that may oc-
cur. The laminated safety glass pane ensures proven and effective splinter protection in the event of an
implosion.
The chambers provide a universal connection for inert gas / ambient air, a compressed air connection for
sweeping the electrical installation area and the controller housing, and a measuring connection serving
to connect a measuring access port.
All installable items, such as racks and rack holders, can be easily removed. The completely smooth in-
ner chamber with its rounded corners and internally welded seams is easy to clean.
The minimum working temperature of the vacuum drying oven is approx. 10 °C / 18 °F to 16 °C / 28.8 °F
above room temperature, depending on the chamber size. The maximum temperature for VDL 23 and 56
is 110 °C / 230 °F, for VDL 115 it is 105 °C / 221 °F.
Vacuum pumps with a suction capacity of 1 m
3.1

Manufacturer's safety plan: Protective measures and equipment

The following measures were taken on the manufacturer's side in order to prevent ignition and explosi-
ons.
• Ignition source monitored via safety temperature limiter (TL) class 2
Only solvents with an auto-ignition temperature above 200 ° C may be entered into the chamber.
There is a safety margin of 20% of the minimum permissible auto-ignition temperature of 200 °C, rela-
ted to the hottest point in the interior (where the heating is attached to the inner chamber). The maxi-
mum surface temperature is 160 °C. Therefore, when operated correctly, the hot surfaces are always
below the auto-ignition temperature zugelassener Stoffe.
The safety temperature limiter (TL) serves to protect the vacuum drying oven, ist environment and
loading material against exceeding the permitted temperature. It has a fixed switching threshold at
165 °C +/- 5% and prevents exceeding this temperatuzre in the event of a fault. If this temperatue is
exceeded, the heater turns off. The TL protects the VDL vacuum drying oven, its environment and the
loading material against impermissible excess temperatures and prevents exceeding the maximum
drying temperature in case of a fault.
The safety temperature limiter (TL) provides mechanical temperature monitoring through an expansion
tank. If the permissible temperature is exceeded, the heating is switched off via a relay and an additio-
nal self-holding circuit is activated, which is only reset when the power plug is removed and reconnec-
ted. This prevents the heating from being automaticalls switched on again via the relay. When the TL
is triggered, an alarm message is displayed on the controller. An annual check by the operator is
recommended, for this a controller test routine is provided.
The setpoint can only be set up to the maximum drying temperature of 110 °C / 230 °F or 105 °C /
221 °F, depending on the chamber type.
Control technology ensures that there are no temperature overshoots when heating up.
VDL (E3) 09/2019
3 3
/h to 30 m /h are suitable for the VD vacuum drying oven.
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