Liquid Controls SP4000 - Manual (Page 64)

61
SP4000 Flow Computer
FLOW INPUT
6.8
FLOW INPUT
(Continued)
The flowmeter pipe expands depending on the temperature of the fluid.
This affects the calibration of the flowmeter.
This submenu allows the user to enter an appropriate correction factor.
This is given by the manufacturer of the flowmeter. This factor converts
the changes in the measuring signal per degree variation from
calibration temperature. The calibration temperature is entered into the
flow computer to 70 F / 21
°
C.
Some manufacturers use a graph or a formula to show the influence of
temperature on the calibration of the flowmeter. In this case use the
following equation to calculate the meter expansion coefficient:
K
ME
Meter expansion coefficient
Q(T) Volumetric flow at temperature T resp. T
CAL
T Average process temperature
T
CAL
Calibration temperature
Note:
• This correction should be set in either the flowmeter or in
the flow computer.
• Entering the value "0.000" disables this function
• Value can be calculated from Fa factor
Input:
Number with floating decimal point:
0.000...999.9 (e-6/
°
X)
Display: 27.111 (E-6/oF)
METER EXP. COEF.
2
RATE 1
TOTAL
Q (T)
Q (T
CAL
)
T – T
CAL
K
me
=
1 –
• 1,000,000
METER EXP. COEF.