Meriam M2 – Series Smart Manometer - Manual (Page 15)

9
down arrow keys to
display the correct
value.
10. Press the PRGM
key until the display
changes.
See note 1
at bottom of this table.
Top line reads “VALUE=”.
Bottom line reads
“CHANGE?: YES”.
11. Press the PRGM
key.
Top line reads “USER UNIT
NAME”.
12. Follow steps 6-8
above to enter “FT
H
2
O”.
Bottom line reads “FT H2O”.
Last letter “O” is blinking.
13. Press the PRGM
key.
Top line reads “PROGRAM
MODE”.
Bottom line reads “UNITS
SELECT”.
14. Press the down
arrow key.
Bottom line reads “EXIT”.
15. Press the PRGM
key. Manometer returns to
Measure Mode. Units Display
shows “FT H
2
O”.
Note 1: If at steps 4 or 10 the “VALUE=” is the desired
value, press the up or down arrow key. This will toggle
the bottom line from the default “CHANGE?: YES” to
“CHANGE?: NO”. Step 5 would then jump to step 10.
Step 11 would then jump to step 13.
Flow Unit Select
Smart Manometers that use differential pressure sensors
can be programmed to display flow measurement units
such as CFM or L/min. The primary element must be a
differential pressure - square root - type device such as a
pitot tube, orifice plate or venturi.
The flow constant and flow units description are
programmed into the manometer using the same
keystrokes used in the User Unit Select programming. At
step
3 choose “FLOW UNIT SELECT” instead of “USER
UNIT SELECT”.
Calculate the Flow constant from the following equation:
F
c
= Q ÷ DP
½
where: F
c
= Flow constant
Q = Flow rate (from the flow element