Meriam M2110F SMART FLOW GAUGE - Manual (Page 24)

24
4. The display shows the exponent value for P9. Press the UP or DOWN ARROWS to change the exponent
digit.
• Press PRGM/ENTER to enter the digit, the decimal point will flash
• Press the UP or DOWN ARROWS to change the sign of the exponent
• Press PRGM/ENTER to enter the exponent value
• The present engineering units will be flashing. Press the UP or DOWN ARROWS to scroll through the
possible units.
• Press PRGM/ENTER to enter the selected units
5. The current engineering unit will now be flashing
• Use the UP/DOWN ARROWS to select the new engineering unit
• The user can rotate through the list of possible units and time bases
• Press PRGM/ENTER after selecting the new units
6. Press the BACKSPACE to return to MEASURE MODE
9.10 P10 – FLOW MEASUREMENT C-COEFFICIENT
The Flow Gauge calculates flow based on the differential pressure that develops across the primary element 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 P10 register is entered in multiple parts, decimal digit (mantissa) and x10 factor (exponent). This is required
because of the wide range of the C-coefficient values depending upon the size, type and rating of the primary
elements. 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.
Example: C-Coefficient = .000123: From primary element data sheet
C-Coefficient = .000123 = 1.23 x 10 -4 = 1.23 E -4
Data Entry Display for P10: 1.230 (After Program mode enter)
- E4 (After Decimal digit enter)
P# Name Description Value Range Notes
P10 C-Coefficient
Scaling The scaling constant required
calibrating the flow measurement
equation. Mantissa range
+/- 9.999
Exponent Range
E+9 to E-9
Total Range
+/- 2.0
P10 required for LFE
devices.
All Models