Meriam M2110F SMART FLOW GAUGE - Manual (Page 23)

23
9.9 P9 – FLOW MEASUREMENT B-COEFFICIENT
The Flow Gauge calculates flow based on the differential pressure that develops across the primary element used in
the flow path. By defining the characteristics of the differential pressure drop as a square root or linear function the
smart gauge can calculate the flow rate from the sampled differential pressure. The P9 register defines the scaling
for the square root primary element, while the P9 and P10 programmable registers together specify the linear
coefficients for the LFE primary elements.
The P9 register is entered in multiple parts, decimal digit (mantissa) and x10 factor (exponent). This is required
because of the wide range of the B-coefficient values depending upon the size, type and rating of the primary
element. This register is entered first as the decimal (mantissa) part using the normal entry method. Following the
entry of this value the display will prompt the user for a x10 factor (exponential) value in the range of E-9 to E+9.
Only after the user has edited the P9 value will access to the unit selection list be allowed.
Example : B-Coefficient = .000123 : From primary element data sheet
B-Coefficient = .000123 = 1.23 x 10 -4 = 1.23 E -4
Data Entry Display for P9: 1.230 (After Program mode enter)
- E3 (After Decimal digit enter)
P# Name Description Value Range Notes
P9 B-Coefficient
Scaling The scaling constant required
calibrating the flow measurement
equation. Mantissa range
+/- 9.999
Exponent Range
E+9 to E-9
Total Range
0 to 2250
1) P9 is required for
LFE and Square
Root devices.
2) If P5 = setpoints
enabled ,and P9 is
set to zero
Pg. 25
Engineering Units Selection List
Gallons /Minute
/Hour
Pounds /Minute
/Hour
Cubic Feet
/Minute
/Hour
Liters /Minute
/Hour
Percent /Minute
/Hour
Kilograms /Minute
/Hour
Cubic Meters /Minute
/Hour
InH
2
O Units
User Units
The actual Flow
display magnitude will
depend on the scaling
values entered in to P9
and P10.
GAUGE IN MEASURE MODE
1. Press PRGM/ENTER to access P0 prompt
2. If lockout is in-active prompt will be P0
• Increment P# using UP ARROW until P9 is displayed
• Press PRGM/ENTER to access the register value
• Press the UP or DOWN ARROWS to change each digit
• Press PRGM/ENTER to enter each digit
• When the flashing decimal point is displayed, Press the UP or DOWN ARROWS to change the sign
• Press PRGM/ENTER to enter the value and sign
3. If lockout is active prompt will be L 00
• Enter Lockout Code then continue as explained in 2) above
All Models