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NOTE: If the user does not press the Push-Button within a 10-second
timeframe or keep the push-button pressed for the required time
(approximately 2 seconds or until Green LED turns Off), no action will take
place. Push-Button entry will reset to the default state and the Green LED will
be
turned
On.
7. MAINTENANCE
7.1 General
It is important that be DPC Mass Flow Controller be used only with clean, dry, non-corrosive
fi ltered gases. Liquids may not be used. Since the restrictor fl ow element (RFE) consists of
small stainless steel channels, it is prone to occlusion due to impediments of large particles
or gas crystallization. Other fl ow passages are also easily obstructed.
Great care, therefore, must be exercised to avoid the introduction of any potential fl ow im-
pediment. To protect the instrument, we recommend the use of in-line fi lters: 5µ (DPC04/07),
20µ (DPC14/17/37/47) or 50u (DPC57/67/77). There is no other maintenance required. It
is good practice, however, to keep the controller away from vibration, hot corrosive envi-
ronments, and excessive RF or magnetic interference. We recommend that instruments be
returned to Aalborg
®
for repair service and calibration (see Section 1.3).
CAUTION: TO PROTECT SERVICING PERSONNEL, IT IS MANDATORY THAT
ANY INSTRUMENT BEING RETURNED FOR SERVICE HAS BEEN COMPLETELY
PURGED AND NEUTRALIZED OF TOXIC, BACTERIOLOGICALLY INFECTED,
CORROSIVE OR RADIOACTIVE CONTENTS.
7.2 Cleaning
Before attempting any disassembly of the instrument for clearning, we recommend inspect-
ing the fl ow paths by looking into the inlet and outlet ends of the instrument for any debris
that may be clogging the fl ow through the instrument. Remove debris as necessary. If the
blockage still exists, contact Aalborg or your local distributor to arrange for repair or clean-
ing service.
CAUTION: DISASSEMBLY MAY COMPROMISE CURRENT CALIBRATION. After
RFE and fl ow paths cleaning, a recalibration is needed. Aalborg offers
professional calibration support. Contact Aalborg or your local distributor for
cleaning and recalibration options.
8. RECALIBRATION
The recommended period for recalibration of the DPC fl ow controller is once annually.
Aalborg
®
Instruments’ Flow Calibration Laboratory offers professional calibration support
for Mass Flow Meters using NIST-traceable precision calibrators under strictly controlled
conditions. NIST-traceable calibrations are available.
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