# Fluid Components International MT91 Manual Glossary User Manual

## Appendix b. glossary of terms

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.

(

)

Are a o f a c irc ular duc t = p r 2 o r p

I .D.

2

2

*Area of a Rectangular duct = h *

* w*

×

**Bipolar**

Allows users to view both negative and positive values for

D

R.

**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*

=

+

+

+

+

−

1

2

3

4

5

2

2

(

)

(

)

(

)

(

)

∆

∆

∆

∆

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*

*1*

+

Ч

+

Ч

+

Ч

(

) (

)

(

)

*C*

*m*

*C*

*m*

*C*

*m*

2

0

3

0

2

4

0

3

**dR Min**

D

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

lowest calibrated

D

R.

**dr Max**

D

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

lowest calibrated

D

R.

**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 =

D

R + Offset Value