MAS
page 6
MAS K05/0722
7. Mechanical Installation
In order to ensure a successful installation, inlet and outlet tubing or piping should
be in a clean state prior to plumbing your MAS to the system. MAS is applicable
to clean gas only because particles and other foreign matter may pollute the
sensor tube and laminar flow element and cause wrong measurement results. In
case of doubt, we recommend to use filters.
The following working pressures and/or medium temperatures may not be
exceeded:
•
10 bar or 50 °C for devices with nylon casing (MAS-1xxx and MAS-2xxx)
•
35 bar or 50 °C for devices with stainless steel casing
(MAS-3xxx and MAS-4xxx)
Be sure that the arrow on the side of the transducer points in the direction of flow.
With the nylon casing you must take care not to the turn the thread too far
(maximum 1.5 turns).
Attention! Over-tightening will crack the fittings and shift
calibration.
The preferred mounting position is horizontal. A vertical installation is possible,
but this must be considered during factory-calibration, since one has to count on
a zero-point movement depending on the operating pressure.
Swagelok and NPT screw connections must not be removed from the casing nor
should their position be altered since they form a unit with the laminar element
and could alter the calibration.
Swagelock-connections:
For the first installation of compression fittings, simply insert the tubing into the
fitting. Make sure that the tubing rests firmly on the shoulder of the fitting and that
the nut is hand-tight. Mark the nut at the six o’clock position. While holding the
fitting body steady with a back-up wrench, tighten the nut 1
1
/
4
turns. Watching the
mark on the nut, make one complete revolution and continue to the nine o’clock
position. After this, the fitting can be reconnected by tightening with a wrench. Do
not fail to use a back-up wrench or the inlet fitting may be damaged.
