25
System Calibration
ACROMAG 611T/612T-500 SIGNAL CONDITIONER CALIBRATION PROCEDURE
After the connectors have been installed on the fiberoptic interconnect fiber and connected
to the
FuelCheck®
Controller and Probe, the attenuation reading on the Optical Gain meter
located on the front of the Controller should read
greater than -20 dBm with the Probe in air.
Typical readings in air are -5 dBm to -10 dBm. If the reading is less than -20 dBm contact
Technical Support at OMNTEC for assistance.
The system calibration is performed in 2 separate steps: A) prelimi-
nary calibration using samples in bottles, and B) final in-line calibra-
tion using known fluids in the pipeline. The preliminary calibration is
performed to simply ensure the sensor readings will be “in-scale”
when the pipeline is running. The final in-line calibration is performed
to optimize the output levels so that all the pipeline products
When performing the preliminary calibration, obtain samples of two
fluids which will fall on each end of the calibration scale. Example: if
the pipeline is transferring gasoline and diesel, the lowest octane
gasoline will be the fluid for the low set point and the diesel will be
used for the high set point. When using something other than gaso-
line and diesel, the fluid which has the dBm reading closest to -30
dBm will be used for the LOW set point.
1.
Turn system power on, allowing time for temperature to stabilize at
the programmed enclosure temperature (default =100°F ).
2.
Connect the multimeter to the + and – input test points. These are
located on the panel containing the on/off switch and the Fuse.
3.
Select the fluid set points within the 4-20 mA range. As an example,
we will select 8 mA for gasoline and 16 mA for diesel. The set point
can be set to any desired ratio to meet your desired presentation on
the display being used.
CAUTION:
Do not use a sharp object for depressing the calibration
buttons on the signal conditioner. Use blunt objects and apply pressure gradually until you feel
a tactile change or see the visual change in the LED’s.
Chapter
5
Acromag
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Summary of Contents for FuelCheck
Page 1: ...F FU UE EL LC CH HE EC CK K...
Page 24: ...23 19 5 11 5 6 0 2 25 2 5 Figure 33 FuelCheck Controller mounting dimensions...
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