27
10.2
Hardware characteristics
Hydraulics
Type
VZD2
4
VZD2
8
VZD2
8E
Nominal diameter
DN
mm
4
8
8
inch
1/8
1/4
1/4
Installation length
mm
54 / 110
1)
70
70
Nominal pressure
25
25
25
Maximum medium temperature
Tmax
°C
-30 to +80
Maximum flow rate
2)
Qmax
l/ h
80
200
600
Continuous flow rate
Qcont
l/ h
50
140
400
Minimal flow rate
Qmin
l/ h
0.5
4
10
Starting flow rate
l/ h
0.4
1.6
2
Minimum measured quantity
MMQ
L
1)
Length including adapter set VSR, part no.: 80630
2)
Do not use for meter sizing.
10.3
Electronic characteristics
Electronic
Environment
Maximum environment temperature
Tmax °C
-20 to +60
Maximum storage temperature
Tmax °C
-25 to +80
Maximum storage humidity, none condensing
Hmax %h
95
Protection class
IEC60529
IP66
Safety, vibration and shock
IEC68
IEC68
Power supply
Voltage range
U
VDC
12 - 24
Maximum power consumption
I
mA
<50
Quiescent current
mA
<10
Update interval
s
<1
Data preservation
EEPROM
Relay output
Switching element
solid state relay
Resistance ON
-
40
Resistance OFF
M
10
Max. supply voltage
VDC
48
Max. switching current
mA
50
Pulse width
ms
2 - 500 (dynamic)
Pulse frequency
Hz
0 - 200
Serial interface
Isolation
Galvanically
Typical output capacitance:
pF
100
Type
RS485 2-wire
Protocol
Modbus
M-Bus
Max. speed Modbus
kBaud
38.4
Max. speed M-Bus
kBaud
9.6
