VEGA VEGAMET 391 4 … 20 mA_HART - Manual (Page 54)

54
11 Supplement
VEGAMET 391 • 4 … 20 mA/HART
36032-EN-130701
Input type Passive
Switching threshold
Ʋ Low -3 …5 V DC
Ʋ High 11 …30 V DC
Max. input voltage 30 V DC
Max. input current 30 mA
Max. sampling rate 10 Hz
Relay outputs
Quantity
6 x operating relay
Function Switching relay for level, fault signal or pulse relay for
flow/sampling pulse
Contact Floating spdt
Contact material AgSnO2, hard gold-plated
Switching voltage min. 10 mV DC, max. 250 V AC/60 DC
Switching current min. 10 µA DC, max. 3 A AC, 1 A DC
Breaking capacity min. 50 mW, max. 500 VA, max. 54 W DC (with U less
than 40 V) 1)
Min. programmable switching hysteresis 0.1 %
Mode pulse output
Ʋ Pulse length 350 ms
Current output
Quantity
1 x output
Function Current output for level or flow/sampling pulse
Range 0/4 … 20 mA, 20 … 0/4 mA
Resolution 1 µA
Max. load 500 Ω
Fault signal (switch over) 0; < 3.6; 4; 20; 20.5; 22 mA
Accuracy
Ʋ Standard ±20 µA (0.1 % of 20 mA)
Ʋ with EMC interferences ±80 µA (0.4 % of 20 mA)
Temperature error relating to 20 mA 0.005 %/K
Mode pulse output
Ʋ Voltage pulse 12 V DC at 20 mA with load 600 Ω
Ʋ Pulse length 200 ms
USB interface 2)
Quantity 1 x on front plate
Plug connection Mini-B (4-pole)
USB specification 2.0 (Fullspeed)
Max. cable length 5 m (196 in)