Greyline Instruments PDFM 5.1, Руководство пользователя

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Page 10
PDFM 5.1 Portable Doppler Flow Meter
CALIBRATION
Press the

to

Calibration and

to enter. Use

or

to position

before
each menu item and

to enter. When settings are completed press

to store and
return to the Calibration menu.
*20mA at
Press

then

or

to change the numbers and decimal point.
Use this menu to set the corresponding flow rate that will be
represented by 20mA analog output. If maximum flow is
unknown, enter an estimated flow rate and observe actual flow to
determine the correct maximum value. Any velocity or flow rate
up to +40 ft/sec (12.2 m/sec) may be selected.
*4mA at
Press

or

to set the flow rate corresponding to 4mA analog
output. This setting may be left at zero flow (or velocity or can
be raised to any value less than the 20mA setting, or lowered to
any velocity or corresponding flow rate down to -40 ft/sec (-12.2
m/sec).
Min Vel
Press

and enter a minimum velocity cutoff. Forward and
reverse velocities less than
Min Vel
will be forced to zero.
Pipe ID
Place the highlight under the digits and then

or

to change
the numbers and decimal point.
Pipe ID
should be entered as
the exact inside diameter of the pipe where the sensor is
mounted. Refer to the Pipe Charts Appendix in this manual for
inside diameter of common pipe types and sizes.
Damping Increase damping to stabilize readings under turbulent flow
conditions. Decrease for fast response to small changes in flow.
Damping is shown in percentage (maximum is 99%). Factory
default is 20%.
Press

to return to Menu Selections .
* Note 4-20mA circuitry is only powered by the AC power module.
To conserve power this output is not active in battery power mode.