Manual

FEM-03 Flow Monitor

Operation and Programming Manual

have completed them. A blinking cursor highlights the active digit or field when entering or editing a

value. As you press SEL, the cursor starts on the left-most digit or character, moves to the right, and

wraps around to the left. Press and hold the UP or DN key to increase or decrease the value. When the

complete, desired value displays, press ENT to store it and advance to the next variable. The FEM-03

advances to the next variable for that mode until all are complete, and then resumes the display mode.

KFR A or B VALUE

The KFR is a scaling factor used in determining rate in a desired engineering unit such as GPM. The KFR

factor also determines the decimal resolution of the rate display. The FEM-03 calculates KFR using the K-

factor of the transducer being monitored. The K-factor is the number of impulses per engineering unit

established by the transducer manufacturer or by a calibration test.

The KFR is on the calibration data sheet supplied with the flow meter. You can also calculate the KFR

using the formula below:

Default is 100.00 (Hertz to two decimal places.)

To calculate the KFR factor, use the following formula: KFR= TIME BASE/K-FACTOR

Where:

- 100 is the TIME BASE constant for engineering units per second

- 6000 is the TIME BASE constant for engineering units per minute

- 360000 is the TIME BASE constant for engineering units per hour

- K-FACTOR is the average number of pulses per desired engineering unit that the

transducer produces.

1. Determine the number of decimal places desired for rate display.

2. Round off the result of the formula to the desired accuracy.

3. Enter the KFR using only that number of decimal places.

Using too few decimal places can cause relatively large display errors, up to several percent of actual

reading. Using too many decimal places can result in displays with a level of precision exceeding the

accuracy of the meter. The factory recommends using no more than four digits regardless of decimal

point position. The largest acceptable value for KFR is 65535 with the decimal in any location

(continued).

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