Pfeiffer Vacuum A 1204H, Operating Instructions Manual

Page: 23 / 92

Installation
23
Connect the nitrogen pipe to the coupling connection (delivered with the pump). Pro-
vide a 6.35 OD (1/4 inch) pipe tubing (supplied by the customer).
Connect the plug on marked NITROGEN (see 4.2) .
Fig. 7: Nitrogen circuit connection
5.4.2 Nitrogen flow rate adjustment
Adjust nitrogen flow rate with the pressure regulator R1 (see 4.2) according to the pro-
cess.
Read the flow on the display of the HHR.
5.5 Connection to the pumping line
When there are pyrophoric, inflammable or toxic materials in the pump, this may lead to
additional risks, which the operator must assess and manage for the entire pumping sys-
tem.
The user and/or product OEM is ultimately responsible for the equipment and must apply
the specific safety guidelines, in accordance with local legislation.
WARNING
Pressurised circuit
To work safely on the product, the operator must:
Install a manual valve on the nitrogen circuit at a distance of 3 m from the product, so
that the nitrogen supply can be locked.
4 mm 6 mm
1/8 NPT 1/8 NPT
NITROGEN
DANGER
Risk of ignition
When flammable materials are sent to the pump:
Provide a hardware-based LEL detection in the exhaust extraction system (detection
capability at 25% of the LEL) that will stop chemical supply to the pump when gas is
detected over 25% of the LEL for that flammable material.
DANGER
Risk of explosion
If any corrosive, reactive, flammable, pyrophoric, oxidizing processes gases can be sent
to the pump:
Use an exhaust gas monitoring to ensure that gas flow to the pump is stopped when
exhaust gas device is lost.