VEGA Conductive electrodes - Manual (Page 12)

12 Conductive measuring system
Measuring data input (channel)
Number 1 (1 x level detection or
1 x pump control -Min-Max)
Response resistance 1 … 200 kOhm adjustable
Parallel resistance
- for fault monitoring
220 kOhm
Meas. circuit max. 5 V eff, max. 1 mA
Permissible line capacitance 1 x 100 nF or
2 x 70 nF at Min-Max.-control
Switching hysteresis approx. 15 %
Measuring data input, Ex-technical data
Signal circuit in classification intrinsic safety EEx ia IIC
Max. values
- U
O
10,6 V
- I
K
8 mA
- P 20 mW
Characteristics linear
Inner effective inductance negligible
Inner effective capacitance negligible
Max. permissible outer inductance 5 mH
Max. permissible outer capacitance 570 nF
The intrinsically safe circuits are reliably galvanically isolated from the not-intrinsically safe
circuits up to a peak value of the nominal voltage of 375 V.
Relay outputs
Number 1
Mode overfill protection (A) and dry run protection (B)
changeable
Contact 1 spdt per output
Contact material AgCdO and Au plated
Turn-on voltage min. 10 mV
max. 250 V AC or 250 V DC
Switching current min. 10 µA
max. 3 A AC or 1 A DC
Breaking capacity max. 750 VA or 54 W
Transistor outputs
Number 1 (synchronuously switching with relay outputs)
Galvanic isolation floating
Turn-on voltage U
B
= max. 36 V DC
Switching current I
B
= max. 60 mA
Voltage loss on transistor U
CE
= approx. 1,5 V at I
B
= 60 mA
Blocking current I
O
< 10 µA
Integration time
Adjustable 0,2 … 20 s
Product description