Heinrichs Messtechnik GmbH
Operating Manual KDS/BGK
Page 23
13
Indicator unit
-
Analogue indicator approx. 160° with pointer
-
Customized product scale
14
Auxiliary power for limit switch
Inductive sensor NJ 1.5-6.5 N:
8.2 V (R
i
approx. 1 k
Ω
)
Inductive sensor NJ 2-11 SN:
8.2 V (R
i
approx. 1 k
Ω
)
Inductive sensor NBB 2-6.5M 30-E2:
10…30 VDC
Via an isolating amplifier.
Available as an accessory for 24/115/230 VAC and 24 VDC.
15
Analog output 4-20 mA
15.1
Measuring principle
The position of the float is transmitted to the pointer axle by means of a magnetic system. The KDSE measures
the field of a magnet mounted on the pointers axle and generates an output current of 4 to 20 mA from it.
15.2
System configuration
KDS-E possesses a passive 4 to 20 mA loop powered analogue output. Therefore the voltage at terminals (plug)
must never fall short of 14 V DC. The 4 to 20 mA output is linearized and corresponds to the indication scale.
Thus the accuracy of the analog output is not influenced by any non-linear function of the
float.
15.3
Measured variable
The position of the float is transmitted to the pointer axle by means of a magnetic system. The KDS-E measures
the magnet field of a magnet -mounted on the pointer axle- and generates a current output
of 4 to 20 mA. As the pointer scale is non-linear - the analog output is linearized with max. 16 interpolation
points not to have an effect on the meter accuracy.
15.4
Parameters
Power supply:
none, 2 wires current loop 4 – 20 mA (passive)
Input voltage:
14 … 30 V DC
Input power:
< 0.65 VA
Load:
500
Ω
The maximum load is calculated according to the formula:
Damping :
1 second, fixed
Influence T
Enviroment
± 0,05 % per 10 K
