KROHNE H250 M9 ES EN - Manual (Page 18)

4
ELECTRICAL CONNECTIONS
18
H250
www.krohne.com 09/2012 - 4002294201 MA H250 KINAX R01 en
Power supply
The required supply voltage can be calculated using the formula below:
U
ext.
= R
L
. 22 mA + 12 V
where
U
ext.
= the minimum supply voltage and
R
L
= the total measuring loop resistance.
Current output adjustment
INFORMATION!
The supply voltage has to be between 12 VDC and 30 VDC. This is based on the total resistance of
the measuring loop. To calculate this, the resistance of each component in the measuring loop
(not including the device) must be added together).
INFORMATION!
The power supply has to be able to supply a minimum of 22 mA.
A fine adjustment of the current output can be performed using the ZERO and SPAN
adjustment screws of the KINAX 3W2 angular position transmitter.
For adjustment of 4.00 mA, the pointer must be set to RP on the scale. 4.00 mA can be set
using ZERO.
For adjustment of 20.00 mA, the pointer must be set to 100% flow rate value of the scale. 20.00
mA can be set using SPAN.
Instead of manual adjustment of the pointer, the flow rate values ??0 and 100% can be set for
the adjustment.
MA_H250_Sonder_Kinax_R01_en_4002294201_PRT.book Page 18 Monday, September 17, 2012 11:13 AM