VEGA VEGAPULS 68 (≥ 2.0.0 - ≥ 4.0.0) 4 … 20 mA_HART - two-wire - Manual (Page 66)

66
11 Supplement
VEGAPULS 68 • 4 … 20 mA/HART - two-wire
36535-EN-130205
Input variable
Measured variable
The measured quantity is the distance between process
fitting of the sensor and product surface. The reference
plane is the seal surface on the hexagon or the lower
side of the flange.
3
4
2
1
Fig. 53: Data of the input variable
1 Reference plane
2 Measured variable, max. measuring range
3 Antenna length
4 Useful measuring range
Max. measuring range 75 m (246.1 ft)
Recommended meas. range depending on the antenna diameter
Ʋ ø 40 mm (1.575 in) up to 15 m (49.21 ft)
Ʋ ø 48 mm (1.89 in) up to 20 m (65.62 ft)
Ʋ ø 75 mm (2.953 in) up to 40 m (131.2 ft)
Ʋ ø 95 mm (3.74 in) up to 50 m (164 ft)
Ʋ Parabolic antenna up to 75 m (246.1 ft)
Output variable
Output signal
4 … 20 mA/HART
Fulfilled HART specification 7.0
Signal resolution 0.3 µA
Failure signal current output (adjustable) mA-value unchanged 20.5 mA, 22 mA, < 3.6 mA
Max. output current
22 mA
Starting current ≤ 3.6 mA; ≤ 10 mA for 5 ms after switching on
Load see load diagram under Power supply
Damping (63 % of the input variable),
adjustable
0 … 999 s
HART output values according to HART 7.0 1)
Ʋ PV (Primary Value) Distance to the level
1) Default values, can be assigned individually