59
15 Supplement
VEGAMET 861 • 4 … 20 mA/HART
58866-EN-200401
Temperature error relating to 20 mA
0.008 %/K
Adjustment range HART sensor
± 10 % of sensor measuring range
Connection cable to the HART sensor
two-wire screened standard cable
Digital input
Quantity
2 x digital input
Input type active
Ʋ
Voltage
> 14 V DC
Ʋ
Current
> 3 mA
Ʋ
Max. load
200 Ω
Input type passive
Ʋ
Switching threshold Low
-3 … 5 V DC
Ʋ
Switching threshold High
11 … 30 V DC
Ʋ
Max. input voltage
30 V DC
Ʋ
Max. input current
30 mA
Ʋ
Max. sampling rate
10 Hz
Ʋ
Input impedance
8 kΩ
Relay output
Quantity
4 x operating relay, one can be configured as fail safe
relay
Function
Switching relay for level, fault signal or pulse relay for
flow/sampling pulse, pump control
Contact
Floating spdt
Contact material
AgSnO2, hard gold-plated
Switching voltage
max. 250 V AC/60 V DC
Switching current
max. 1 A AC (cos phi > 0.9), 1 A DC
Breaking capacity
3)
min. 50 mW, max. 250 VA, max. 40 W DC (with
U < 40 V DC)
AC/DC operation
Mixed operation with AC/DC voltage is not permitted for
the relay outputs
Min. programmable switching hysteresis 0.1 %
Mode pulse output
Ʋ
Pulse length
350 ms
Current output
Quantity
1 x output
Function
Level/flow/sampling pulse
Range
0/4 … 20 mA, 20 … 0/4 mA
Resolution
1 µA
Max. load
500 Ω
3)
If inductive loads or stronger currents are switched through, the gold plating on the relay contact surface will be
permanently damaged. The contact is then no longer suitable for switching low-level signal circuits.
