Aalborg XFM Digital - Manual (Page 5)

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CAUTION: XFM TRANSDUCERS SHOULD NOT BE USED FOR MONITORING
OXYGEN GAS UNLESS SPECIFICALLY CLEANED AND PREPARED FOR SUCH
APPLICATION.
For more information, contact your distributor or Aalborg
7
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Attitude limit of the Mass Flow Meter is ±15
F
from calibration position (standard
calibration is in horizontal position). This means that the gas flow path of the Flow
Meter must be within this limit in order to maintain the original calibration accura-
cy. Should there be need for a different orientation of the meter, re-calibration may
be necessary. It is also preferable to install the XFM transducer in a stable envi-
ronment, free of frequent and sudden temperature changes, high moisture, and
drafts.
Prior to connecting gas lines inspect all parts of the piping system including fer-
rules and fittings for dust or other contaminant’s.
When connecting the gas system to be monitored, be sure to observe the direc-
tion of gas flow as indicated by the arrow on the front of the meter.
Insert tubing into the compression fittings until the ends of the properly sized tub-
ing home flush against the shoulders of the fittings. Compression fittings are to be
tightened to one and one quarter turns according to the manufacturer's instruc-
tions. Avoid over tightening which will seriously damage the Restrictor Flow
Elements (RFE's)!
CAUTION: For XFM 17/37/47/57/67/77 models, the maximum pressure in the
gas line should not exceed 500 PSIA (34.47 bars). Applying pressure above
500 PSIA (34.47 bars) will seriously damage the flow sensor.
XFM transducers are supplied with either standard 1/4 inch (XFM 17 and 37), 3/8
inch (XFM 47/57), ½ inch (GDFM 67), or optional 1/8 inch inlet and outlet com-
pression fittings which should NOT be removed unless the meter is being cleaned
or calibrated for a new flow range. XFM 77 transducers are supplied with ¾ inch
FNPT fittings.
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