Aalborg GFM - Manual (Page 6)

2
CAUTION: IT IS THE USERS RESPONSIBILITY TO DETERMINE IF THE
INSTRUMENT IS APPROPRIATE FOR THEIR OXYGEN APPLICATION, AND FOR
SPECIFYING O2 CLEANING SERVICE IF REQUIRED. AALBORG IS NOT LIABLE
FOR ANY DAMAGE OR PERSONAL INJURY, WHATSOEVER, RESULTING FROM
THE USE OF THIS INSTRUMENT FOR OXYGEN GAS.
For more information contact your distributor or Aalborg
7
.
Attitude limit of the Mass Flow Meter is ±15 F from calibration position (standard cal-
ibration 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 accuracy. Should
there be need for a different orientation of the meter, re-calibration may be neces-
sary. It is also preferable to install the GFM transducer in a stable environment, 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.
Be sure to observe the direction of gas flow as indicated by the arrow on the front
of the meter when connecting the gas system to be monitored.
Insert tubing into the compression fittings (except GFM77) until the ends of the
properly sized tubings home flush against the shoulders of the fittings.
Compression fittings are to be tightened according to the manufacturer's instruc-
tions to one and one quarter turns. Avoid over tightening which will seriously dam-
age the Restrictor Flow Elements (RFE's)!
Using a Helium Leak Detector or other equivalent method perform a thorough leak
test of the entire system. (All GFM's are checked prior to shipment for leakage
within stated limits. See specifications in this manual.)
2.2 Electrical Connections
All GFM models require power supplies with nominal current rating of at least
200 mA. The operating power input is supplied via the DC power jack or the 9-
pin “D” connector located at the side of the flow transducer enclosure. On
GFM's pur-chased without an LCD readout, a readout panel meter, digital
multimeter, or other equivalent device is required to observe the flow signal.
ƽ
CAUTION: Some of the IC devices used in the GFM are Electro Static
Discharge (ESD) sensitive and may be damaged by improper handling.
When wiring interface connector, adjusting or servicing the meter, use of a
grounded ESD protection wrist strap is required to prevent inadvertent
damage to the CMOS integral solid state circuitry. When 9 pins interface
D-connector is not used do not remove factory installed ESD protection cover.
ƽ
CAUTION: WIRING THE GFM METER WITH THE POWER ON MAY RESULT IN
INTERNAL DAMAGE! PLEASE MAKE ALL WIRING CONNECTIONS BEFORE
SWITCHING ON THE POWER.
ƽ