Greyline Instruments PTFM 1.0, Руководство пользователя

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Page 15
PTFM 1.0 Portable Transit Time 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 Flow
Flow rates below this setting will be displayed as zero flow.
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 5%.
Press

from the Units/Mode display 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.