VEGA VEGADIF 34 … 51 - Manual (Page 10)

10 VEGADIF 34 … 51
20094-EN-030731
Product description
Electrical data
Connection
Cable entry Pg 13.5 (for cable-ø 9 … 12 mm) 1)
Screw terminals for wire cross section up to 2.5 mm 2
Ground terminal for wire cross section up to 4 mm 2
Supply and signal circuit (4 … 20 mA signal)
Supply voltage
- non-Ex instruments
11.5 … 45 V DC
- Ex instruments 11.5 … 30 V DC
Residual ripple no influence at U
SS
≤
4.5 V
Output signal 4 … 20 mA linear (differential pressure proportio
nal) or square root (flow proportional changeable)
Resolution better than 6 µA
Current limitation approx. 23 mA
Measuring range overrun 2.8 mA (standard) or 4 mA
Measuring range overrun 20.5 mA acc. to NAMUR
Fault signal (adjustable) 3.6 mA, 21.5 mA, current value
Integration time 2) 0 … 16 s with keys on the instrument
0 … 40 s with HART
® handheld
Adjustment period 0.5 … 2.0 s depending on the measuring range
Rise time 0.4 … 1.6 s depending on the measuring range
Heating time 2 s
Connection cable 2-wire
Max. permissible load depending on the power supply
Supply and signal circuit (digital communication signal HART ® )
Connection cable 2-wire (communication must not be influenced
by unshielded cables)
Line resistance
≤
25
Ω
/km
Total resistance more than 250
Ω
(communication resistance of
at least 250
Ω
necessary)
Total capacitance less than 180 nF
Max. length 1000 m
1) with smaller cable diameter, a suitable seal must be provided by the customer
2) Adjustment time of 10 % … 63 % of the measuring range final value
Voltage of the external energy U
H
in Volts
Load
R total
in Ohm
500
1000
1560
20 28,5 37 45 11,5
0