Vega WEIGHTRAC 31 Operating Instructions Manual page 66

10 Supplement
Ʋ Internal load
Switching input
Ʋ Type of input - Open Collector
Ʋ Type of input - Relay contact
Output variable/Mass flow rate measurement
Output signals
Range of the output signal
Terminal voltage passive
Shortcircuit protection
Potential separation
Signal resolution
Failure signal current output (adjustable) 22 mA, < 3.6 mA
Max. output current
Starting current
Load
Ʋ 4 ... 20 mA/HART - active
Ʋ 4 ... 20 mA/HART - intrinsically safe
Damping (63 % of the input variable)
HART output values
Ʋ PV (Primary Value)
Ʋ SV (Secondary Value)
Ʋ TV (Third Value)
FV (Fourth Value)
Relay output
Output
Switching voltage
Ʋ Min.
Ʋ Max.
Switching current
Ʋ Min.
Ʋ Max.
Breaking capacity
Ʋ Min.
Ʋ Max.
Contact material (relay contacts)
66
250 Ω
10 mA
100 mA
4 ... 20 mA/HART - active; 4 ... 20 mA/HART - passive
3.8 ... 20.5 mA/HART
9 ... 30 V DC
Available
Available
0.3 µA
22 mA
≤ 3.6 mA
< 500 Ω
< 300 Ω
1 ... 1200 s, adjustable
Mass flow
Electronics temperature
Mass coefficient (e.g. in kg/m)
Pulse rate
Relay output (SPDT), floating spdt
10 mV
253 V AC, 253 V DC
10 µA
3 A AC, 1 A DC
50 mW
750 VA AC, 40 W DC
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.
AgNi or AgSnO and Au plated
WEIGHTRAC 31 • 4 ... 20 mA/HART - four-wire