Micro Motion RFT9709 Manuál s instrukcemi stáhnout pdf (Strana 92)

Using ProLink

Software with Micro Motion

Transmitters

Configure Menu: Characterize

continued

Density factors for RFT9739

10.Multiply the meter factor from step 8. This is the mass-flow meter

factor. Record the meter factor. by the first five digits of the current

flow calibration factor. This is the first five digits of the new flow

calibration factor.

11.Open the Configure menu, then choose Characterize to open the

Characterize Sensor dialog box. Enter the new flow calibration factor

in the FlowCal text box. The complete flow calibration factor should

have eight digits and two decimal points.

Enter the value from step 10 as the first five digits and first deci-

mal point.

For the last three digits and second decimal point, enter the last

three digits and decimal point from the flow calibration factor

entered in step 4.

12.To verify the accuracy of the new flow calibration factor, repeat

step 7. The amount of fluid indicated in the Totalizer Control dialog

box should equal the weighed amount of fluid in the batch, within

accuracy specifications provided by Micro Motion for the flowmeter.

8.3 Density factors for

RFT9739

Density factors describe a particular sensor's density measurement

sensitivity. Testing conducted in the Micro Motion Flow Calibration

Laboratory determines the precise values of the density factors for each

sensor.

The RFT9739 uses six separate factors to calculate density:

•

Dens A

is the density, in grams per cubic centimeter, at line

conditions, of the low-density material used during a two-point

density calibration.

•

Dens B

is the density, in grams per cubic centimeter, at line

conditions, of the high-density fluid used during a two-point density

calibration.

•

is the tube period, in microseconds, adjusted to 0

C, when the

flow tubes contain the Dens A calibration fluid at line conditions.

•

is the tube period, in microseconds, adjusted to 0

C, when the

flow tubes contain the Dens B calibration fluid at line conditions.

•

(or

K3)

accounts for the effect of high flow rate on the density

measurement, and usually is not required. The FD and K3 factors

can be stored in, and viewed from, the ProLink transmitter

configuration file. The FD or K3 density calibration procedure is

described in

Section 14.4

, page 138.

•

Temp Coeff

, the temperature coefficient for density, represents the

percent change in the elasticity of the flow tubes around the bending

axis, and the corresponding change in tube period, per 100

Mass-flow meter factor

1 2 ... 87 88 89 90 91 92 93 94 95 96 97 ... 213 214

Komentáře k této Příručce

Žádné komentáře

Micro Motion RFT9709 Manuál s instrukcemi Strana 92

Komentáře k této Příručce