BINDER VD 23 - Manual (Page 20)

VDL (E2.1) 04/2014 page 20/107
DANGER
Operation with material containing solvent that may be able to form an explosive
mixture with air.
Explosion hazard.

Follow the measures required for operation with solvent-containing materials that can
form an explosive mixture with air.
Measures required for operation with solvent-containing materials that can form an explosive
mixture with air:
•
Only trained personnel with key-authorization can work on the VDL vacuum drying oven
• Sweep the area for electrical equipment with compressed air or inert gas for at least 15
minutes. Sweeping must take place during the entire operating cycle; otherwise the vacuum
drying oven will shut off at all poles.
• Only after at least 15 minutes of sweeping, use the key switch to put the unit in operation.
• Determine the maximum drying temperature in relation to the ignition temperature of the
solvent according to the information panel “Temperature setting” (chap. 2.5). Do NOT ex-
ceed this temperature when presetting the set point on the RD3 temperature controller.
• In the case of solvent mixtures, use the ignition temperature of the solvent with the lowest
ignition temperature. For the ignition temperature, refer to the safety specifications of the
solvent.
• Before starting the drying process, set the temperature safety device to the maximum al-
lowed drying temperature according to the information panel “Temperature setting” (chap.
2.5). It is NOT sufficient to directly adjust the maximum temperature of the temperature
safety device to the maximum temperature of the solvent’s temperature class.
• Introduce the drying material and turn on the vacuum pump.
• Start the drying process. The heating unit is only released when a vacuum of 125 ± 25 mbar
/ 3.69 ±0.74 inHg) or below is reached.
• The duration of the drying process can be determined by means of the analogue pressure
display on the oven. When the pressure drops to pump pressure, the drying process is fin-
ished.
• Stop the drying process.
• Ventilate the vacuum drying oven using the aeration valve for ambient air (5) or inert gas
(6).
• Remove the charging material. Turn the key switch to position 0 (OFF) and remove the key
to prevent unauthorized operation of the oven.
• Sweep the area for electrical equipment at least 15 minutes with compressed air or inert
gas.
• Let the oven cool down to ambient temperature before you start a new drying process with
a modified ignition temperature.