Operation – KROHNE IFC 100 Converter EN User Manual

Page 56

OPERATION

IFC 100

www.krohne.com

07/2010 - 4000041004 - MA IFC 100 R04 en

C1.2 filter

C1.2

filter

Grouping of all functions related to filter of measuring sensor electronics.

C1.2.1

limitation

Limitation of all flow values, before smoothing by time constant, affects all

outputs.

Settings: -xxx.x / +xxx.x m/s; condition: 1st value < 2nd value

Range 1st value: -100.0 m/s ≤ value ≤ -0.001 m/s

Range 2nd value: +0.001 m/s ≤ value ≤ +100 m/s

C1.2.2

flow direction

Define polarity of flow direction.

forwards (according to the arrow on the measuring sensor) or backwards (in

the opposite direction to the arrow)

C1.2.3

time constant

For all flow measurements and outputs.

xxx.x s; range: 0.0…100 s

C1.2.4

pulse filter

Suppresses noise due to solids, air/gas bubbles and sudden changes in pH.

Select: off (without pulse filter) / on (with old pulse filter) / automatic (with

new pulse filter)

Pulse filter "on":

Pulse filter "on": The change from one measurement value to the next one is

limited to the value "pulse limitation" for the total time "pulse width".

This filter allows a faster signal tracking for slowly changing flow values.

Pulse filter "automatic":

Pulse filter "automatic": The raw flow values are collected into a buffer,

covering two times the "pulse width" values. This filter is called "median"

filter.

This filter allows a better suppression of pulse shaped disturbances

(particles or air bubbles in very noisy environment).

C1.2.5

pulse width

Length of interference and delays to be suppressed on sudden changes in

flow.

Only available, if pulse filter (Fct. C1.2.4) is "on" or "automatic"

xx.x s; range: 0.01...10 s

C1.2.6

pulse limitation

Dynamic limitation from one measured value to the next; only effective, if

pulse filter (Fct. C1.2.4) is "on".

xx.x s; range: 0.01...100 m/s

C1.2.7

noise filter

Suppresses noise at low conductivity, high solids content, air and gas

bubbles, and chemically inhomogeneous media.

Select: off (without noise filter) / on (with noise filter)

C1.2.8

noise level

Range within which changes are evaluated as noise, and outside of which

changes are evaluated as flow (only with noise filter switched on,

Fct. C1.2.7).

xx.xx m/s; range: 0.01...10 m/s

C1.2.9

noise suppression

Set noise suppression (only when noise filter switched on, Fct. C1.2.7).

Range: 1…10, noise suppression factor [min = 1...max = 10]

C1.2.10

low flow cutoff

Sets output value of all outputs to "0":

x.xxx ± x.xxx m/s (ft/s); range: 0.0…20 m/s (0.0...32.8 ft/s)

(1st value = switching point / 2nd value = hysteresis),

condition: 2nd value ≤ 1st value

C1.2.11

conductivity

Setting the time constant for the conductivity measurement; only available, if

the conductivity measurement is activated

.book Page 56 Friday, July 9, 2010 12:29 PM