Fluid-components-international MT91 Manual Glossary User Manual download pdf

Doc. No. 003185 Rev. B B - 1

Model MT91 Multipoint Flowmeter

APPENDIX B - GLOSSARY FLUID COMPONENTS INTL

Appendix B. Glossary of Terms

Area

Cross-sectional area for a process line or duct.

()

Area of a circular duct= p r

or p

I.D.

Area of a Rectangular duct = h w×

Bipolar

Allows users to view both negative and positive values for DR.

DVM

Digital Voltmeter

EIA

Electronics Interface Association

C1 - C5

C1 through C5 are flow coefficients for the balanced polynomial equation. The

flow coefficients characterize the shape of the curve generated by the equation.

Flow C R C R C C R C R

=++++

−

12345

( ) () () ( )

∆∆ ∆∆

C1- C5 are unique to each sensing point. On the Delta R Paramter sheet,

they are shown as H01C1 through H01C5 for sensing point 1. (H = head,

01 = sensing point 1).

Comm Mode

Serial communication mode. There are three options: EIA-232, EIA-422, EIA-

485.

CorrF[1] - [4]

CorrF[1] through CorrF[4] are correction factors that apply to the Corrected Flow

Rate equation. See Chapter 3 - Operation for more information.

Corrected Flow Rate = C

+×+×+×()()()Cm Cm Cm

20 30

dR Min

DR value low end cutoff. Should be set to approximately 5 ohms less than the

lowest calibrated DR.

dr Max

DR value high end cutoff. Should be set to approximately 5 ohms greater than the

lowest calibrated DR.

Flow Element

The Flow Element includes the local enclosure and the sensing points.

Flow Factor

The Flow Factor is the multiplier that converts the internal flow rate (SFPS) to the

user selected flow untis.

Flow Min

Minimum calibrated flow rate in standard feet per second (SFPS)

Flow Max

Maximum calibrated flow rate in standard feet per second (SFPS)

Flow Transmitter

The Flow Transmitter consists of the remote enclosure and all of the electronics

contained within.

Full Scale

Full scale is from the zero value to the max flow value. For zero based

applications this is from 0.00 to the maximum flow value. For non-zero based

applications full scale is from minimum flow value to the maximum flow value.

Offset 1 - 16

Offset value for each sensing point. Offset Equation = DR + Offset Value

1 2

Summary of Contents

Page 1 - +×+×+×()()()Cm Cm Cm

Doc. No. 003185 Rev. B B - 1 Model MT91 Multipoint FlowmeterAPPENDIX B - GLOSSARY FLUID COMPONENTS INTLAppendix B. Glossary of TermsAreaCross

Page 2

FLUID COMPONENTS INTL APPENDIX B - GLOSSARYModel MT91 Multipoint Flowmeter B - 2 Doc. No. 003185 Rev. BPort [1]Channel 1 for output signal. Port [2]

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