Aalborg AFC - Manual (Page 5)

2
2. INSTALLATION
2.1 Primary Gas Connections
Please note that the AFM/AFC Mass Flow Meter/Controller will not operate with
liquids. Only clean gases are allowed to be introduced into the instrument. If
gases are contaminated they must be filtered to prevent the introduction of imped-
iments into the sensor.
Attitude sensitivity of the Mass Flow Meter is +15
F
. This means that the gas flow path
of the Flow meter/Controller must be horizontal within those stated limits. Should
there be need for a different orientation of the meter, re calibration may be necessary.
It is also preferable to install the AFM/AFC 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 contaminants.
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 until the ends of the properly sized tub-
ings home flush against the shoulders of the fittings. Compression fittings are to
be tightened according to the manufacturer's instructions to one and one quarter
turns. Avoid over tightening which will seriously damage the Restrictor Flow
Elements (RFE's)!
AFM/AFC transducers are supplied with standard 1/4 inch (AFM/AFC 26 and 36)
or 3/8 inch (AFM/AFC 46), or optional 1/8 inch inlet and outlet compression fit-
tings which should not be removed unless the meter is being cleaned or calibrat-
ed for a new flow range.
Using a Helium Leak Detector or other equivalent method perform a thorough
leak test of the entire system. (All AFM/AFC's are checked prior to shipment for
leakage within stated limits. See specifications in this manual.)
2.2 Electrical Connections
AFM/AFC transducers require a +15VDC and -15VDC power supply to operate.
Additionally, a readout panel meter, digital multimeter, or other equivalent device
is required to observe the flow signal. A variable analog 0-5VDC reference input
is required for AFC models. The Aalborg
7 SDPROC accessory Command
Modules offer a convenient and compact means to fulfill these needs.
AFM/AFC transducers come with a 15 pin "D" connector. The pin diagram is pro-
vided on figure 2-3.
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. ƽ