● Maintenance and cleaning
● Storage or disposal
The work described in this document is only permitted to be performed by persons with the appropriate
technical qualifications (expert personnel) or who have received the relevant training from Pfeiffer Vac-
uum.
1.3 Conventions
1.3.1 Instructions in the text
Usage instructions in the document follow a general structure that is complete in itself. The required ac-
tion is indicated by an individual step or multi-part action steps.
Individual action step
A horizontal, solid triangle indicates the only step in an action.
► This is an individual action step.
Sequence of multi-part action steps
The numerical list indicates an action with multiple necessary steps.
1. Step 1
2. Step 2
3. ...
1.3.2 Pictographs
The pictographs used in the document indicate useful information.
Note
Tip
Wear laboratory gloves
Perform a visual inspection
1.3.3 Stickers on the product
This section describes all the stickers on the product along with their meaning.
D-35614 Asslar
Mod.
P/N
S/N
Input
PKR 251
PT R26 xxx
xxxxxxxxx
15...30 V DC 2 W
Made in Liechtenstein 2019/04
3103457
Rating plate
The rating plate is located on the top of
the device.
10 cm
4”
Warning against magnetic fields
The sticker displays a warning that the
magnetic field of the gauge can interfere
with the functioning of pacemakers, and
specifies the minimum distance to the
gauge which must be maintained by per-
sons with pacemaker implants.
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