VEGA VEGABAR 87 4 … 20 mA_HART - Operating Instructions - Manual (Page 69)

69
11 Supplement
VEGABAR 87 • 4 … 20 mA/HART
45044-EN-131010
Cable length max.
Ʋ Sensors with signal output
4 … 20 mA, 4 … 20 mA/HART
50 m
Ʋ Sensors with signal output Profibus
PA, Foundation Fieldbus
25 m
Interface to the slave sensor
Data transmission
digital (I²C-Bus)
Configuration, connection cable 4-wire, screened
Cable length max. 25 m
Integrated clock
Date format
Day.Month.Year
Time format 12 h/24 h
Time zone Ex factory CET
Rate deviation max. 10.5 min/year
Measurement electronics temerature
Resolution
1 °C (1.8 °F)
Accuracy ±1 °C (1.8 °F)
Voltage supply
Operating voltage U
B
Ʋ Non-Ex instrument 9.6 … 35 V DC
Ʋ Ex-d instrument 9.6 … 35 V DC
Ʋ Ex-ia instrument 9.6 … 30 V DC
Ʋ Ex-d-ia instrument 15 … 35 V DC
Ʋ Ex-d-ia instrument with ship approval 15 … 35 V DC
Interpolation protection Integrated
Permissible residual ripple - Non-Ex, Ex-ia instrument
Ʋ for U
N
12 V DC (9.6 V< U
B
< 14 V) ≤ 0.7 V
eff
(16 … 400 Hz)
Ʋ for U
N
24 V DC (18 V< U
B
< 35 V) ≤ 1.0 V
eff
(16 … 400 Hz)
Permissible residual ripple - Ex-d-ia instrument
Ʋ for U
N
24 V DC (18 V< U
B
< 35 V) ≤ 1 V
eff
(16 … 400 Hz)
Load resistor
Ʋ Calculation (U
B
- U
min
)/0.022 A
Ʋ Example - Non-Ex instrument with
U
B
= 24 V DC
(24 V - 9.6 V)/0.022 A = 655 Ω
Potential connections in the instrument
Electronics
Not non-floating
Ground terminal Galvanically connected with the process fitting