VEGA VEGABAR 67 4 … 20 mA_HART - Manual (Page 55)

55
10 Supplement
VEGABAR 67 • 4 ... 20 mA/HART
36742-EN-130321
Weight approx.
Ʋ Basic weight 0.7 kg (1.543 lbs)
Ʋ Suspension cable 0.1 kg/m (0.07 lbs/ft)
Ʋ Connection tube 1.5 kg/m (1 lbs/ft)
Ʋ Straining clamp 0.2 kg (0.441 lbs)
Ʋ Threaded fitting 0.4 kg (0.882 lbs)
Lengths
Ʋ Connection tube 0.25 … 6 m (0.82 … 19.69 ft)
Output variable
Output signal
4 … 20 mA/HART
HART output values according to HART standard 5.0
Ʋ Primary Value Pressure
Ʋ Secondary Value Temperature 11)
Signal resolution 1.6 µA
Failure signal current output (adjustable) mA-value unchanged 20.5 mA, 22 mA, < 3.6 mA
Max. output current
22 mA
Load see load diagram under Power supply
Met NAMUR recommendation NE 43
Dynamic behaviour output
Run-up time approx.
10 s
90 %
100 %
10 %
t
t
T A
t
t
S
2 1
Fig. 32: Sudden change of the process variable. t
T
: dead time; t
A
: rise time; t
S
: jump response time
1 Process variable
2 Output signal
Dead time ≤ 150 ms
Rise time ≤ 100 ms (10 … 90 %)
Step response time ≤ 250 ms (ti: 0 s, 10 … 90 %)
Damping (63 % of the input variable) 0 … 999 s, adjustable
11) Depending on the respective instrument and the process fitting, the temperature can deviate from the real
process temperature.