4-13
Checking Static Pressure (SP)
The
µ
FLO allows you to check the Static Pressure Calibration and log the pressure marker check points.
It is recommended that checks of the Static Pressure (SP) be done prior to and directly following the
calibration.
During normal operation of the
µ
FLO, the display provides continuous SP readouts. However during this
procedure the
µ
FLO is placed in a temporary hold mode.
You can enter as many SP pressure markers as you desire. Recording too many markers could cause
the
µ
FLO to overwrite existing older events. Only the last five checks are used by the WINCCU editor for
calibration adjustment. Enter a low, mid-low, mid, mid-high and high value.
During this procedure, you will pressure both sides of the cell by closing both the
high and low side orifice valves, open the vent to atmosphere, then closing the
atmosphere vent and opening both high and low bypass valves.
The resulting comparison pressure must not be greater than the static pressure
cell's maximum pressure.
Calibrating Static Pressure (SP)
A three or five point pressure method is used to calibrate the
µ
FLO Static Pressure cell. These different
pressures are applied to the cell from a known traceable source with resultant pressure values entered
into the
µ
FLO using PCCU software.
When calibrating, wait for the readings to stabilize before entering new values.
The
µ
FLO uses an absolute Static Pressure (SP) Cell. Absolute pressure measures
the pressure referenced to a vacuum or sealed chamber. This is different than a
gauge cell which measures the pressure referenced to the atmosphere.
It is recommended that the initial calibration point be at vented conditions and when
doing so that the barometric pressure reading (in psi) be used as the initial point.
Since the static pressure cell is an absolute device, it always measures the true
pressure relative to a vacuum or sealed chamber. Thus when vented, it measures
true barometric pressure.
For other points of calibration, add reading of PSI and barometric pressure to arrive
at psia, then enter this reading.
To convert barometric pressure measured from inches of mercury to Barometric
Pressure (psi), perform the following calculation:
Barometric pressure, in inches of mercury x .4912 or (
÷
2.036) equals Barometric
Pressure in psi.
Summary of Contents for uFLO
Page 1: ...2100890 001 AB TOTALFLOW µFLO Computer User s Manual ...
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Page 16: ...1 2 FLO 6213 Figure 1 1 µFLO 6213 Dimensions ...
Page 18: ...1 4 Figure 1 3 Bottom View µFLO 6213 9 367 9 992 8 647 Figure 1 4 Bottom View µFLO 6210 ...
Page 39: ...2 9 FLO 6213 Figure 2 7 µFLO 6213 Wall Mounted ...
Page 50: ...2 20 Figure 2 13 Mounting AC Charger ...
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Page 70: ...4 6 11 9 5 4 1 13 3 FLO 6210 12 8 7 10 2 Figure 4 2 µFLO 6210 Component Cable Locations ...
Page 71: ...4 7 1 6 FLO 6213 5 13 3 2 4 7 8 10 9 12 11 Figure 4 3 µFLO 6213 Component Cable Locations ...
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