Operating Instructions for Digital Mass Flow Meter and Controller Model: DMS

Kobold Messring GmbH Chapter 2 Installation
Installing the Instrument—Plumbing
® ®
DMS instruments are supplied with compression, VCO , VCR , or
female NPT process connections. To ensure a successful installation, inlet
and outlet tubing should be in a clean state prior to plumbing the instrument
into the system. The shipping caps covering the inlet/outlet fittings
should not be removed until immediately before installation.
Follow the installation instructions that are applicable to your instrument’s
process connection. Ensure that the tubing is free from burrs, or sharp rims
that may result from cutting.
CAUTION: Before use, all plumbing should be checked carefully for
leaks, especially at the connecting fittings. All instruments are leaktested
prior to shipping. It is not a requirement to leak test your instrument.
Do not use liquid leak detectors to search for leaks
inside or outside the DMS. Instead, monitor pressure decay.
Compression Fittings
1. Position the instrument with the flow direction arrow pointing in
the direction of flow.
2. Verify the position of the
front and back ferrule. Insert
the tubing into the fitting.
Be sure that the tubing
rests firmly on the
shoulder of the fitting and
that the nut is finger-tight.
Scribe the nut at the six
o’clock position.
3. While holding the fitting body steady with a backup wrench,
tighten the nut 1-1/4 turns, watching the scribe mark make one
complete revolution and continue to the nine o’clock position. For
1/16-inch, 1/8-inch and 3/16-inch (2, 3 and 4 mm) sizes, tighten
only 3/4 turns from finger-tight. Do . not over-tighten!
4. If you use flexible tubing (Example: Polyflow) use an “Insert” (see
www.swagelok.com)
DMS 2-3