Burkert Type 8620 - Manual (Page 59)

mxCONTROL Type 8620
Page 59
Unit Group Measuring units (*)
Miscellaneous ppm, V, mA, Pulse, Hz, %, no unit?
Chemical Analysis µS/cm, mS/cm, MPY, µMPY, mV, mg/L, %Sat, pH
Volume L, hL, m3, Gal US; bbl US, gal Imp, ft3, yd3
Flow (flow rate) L/s, L/min, L/h, m3/min, m3/h, Gal/s US, Gal/m US, Gal/h US, gal/s Imp, gal/m Imp, gal/h
Imp, bbl/s US, bbl/m US, bbl/h US, ft3/s, ft3/min, ft3/h, P/s, P/m
Temperature °C, °F, °Rank, K
Pressure bar, mbar, psi
(*) If the display does not have sufficient spaces available, only 3 or 6 digits are shown; please refer
to the table in chapter 5.2 for the specific unit abbreviations.
Low Pass Filter
To minimise the effect of spikes and fast transients acting on the device's external cabling and
possibly causing interferences, a low pass filter (PT1) is employed.
The setting is made via the selection of the filter stage (refer to the following Table 6).
Filter stage Corresponds to limit frequency [Hz] Effect
0 10 Lowest filter effect
1 5
2 2
3 1
4 0,5
5 0,2
6 0,1
7 0,07
8 0,05
9 0,03 Greatest filter effect
Table 6: Filter stage and limit frequency
(Process Value) Alarm
This function activates the general alarm output if a controlled process value exceeds the (adjustable)
upper and lower alarm limits.
If the scaling unit of a frequency input was changed, the corresponding alarm and warning
limits
and the set points of the corresponding modules have to be set manually to the value
corresponding with the new engineering unit of the input (no automatic conversion from one
unit to a different one!).
When changing the scaling values, the corresponding alarm and warning limit as the set
points of the corresponding modules should be examined for their relevance!