Functions Of The Lcd Indicator For The Dwm 2000 D; Programmable Parameters; Flow Calibration; Current Output Adjustment - KROHNE DWM 2000 D Operating Instructions Manual

2

Functions of the LCD indicator for the DWM 2000 D

2.1

Programmable parameters

2.1.1 Flow calibration

The G can be modified in menu 2.1.3 in order to obtain the maximum accuracy at operating
K
conditions. A field calibration requires an accurate reference of velocity. The meter recalibration (G
modification) is also recommended after an exchange of electronics module.
The value of the new calibration constant (G

2.1.2 Current output adjustment

The minimum value (i
conditions can be adjusted from menus 2.2.2. and 2.2.3.
The actual values of the i
4...20 mA loop.
i must be in the range 3....12 mA. The factory setting is 4 mA.
0%
i must be in the range 12....21 mA. The factory setting is 20 mA.
100%

2.1.3 Time constant

The time constant value can be set in menu 2.2.4. This value represents the time needed to detect
63% of a simulated flow rate instantaneously raised from 0 to 100%. Time constant range : 5, 10,
15, 20, 25, 30, 50 m.
4
GK = GK x Va
new old
Vm
with:
Va = actual velocity
Vm = measured velocity (reference value)
) and the maximum value (i
0%
and the i must be measured with an accurate milliammeter in a
0% 100%
Operating Instructions DWM 2000 D
new) can be calculated as follows:
K
) of the current output at normal operating
100%
K