
Maintenance and repairs induQ®- Series VMI
Technical changes reserved 15 Ba_VMI_en 07/2010
7 Maintenance and repairs
The flow sensor is maintenance-free and cannot be repaired by the user. In the unlikely event of a defect,
the device has to be returned to the manufacturer for repair work.
8 Decommissioning and disposal
ªNever remove a flow sensor from a system under pressure.
ªRemove all the electrical connectors and disassemble the flow sensor.
ªThe flow sensor consists of various materials. Never dispose of the flow sensor in domestic waste (refer
to the crossed out waste bin displayed on the type plate).
ªReturn the flow sensor to the manufacturer for correct disposal.
9 Technical data
The technical data of customised versions may differ from the data in these instructions. Please observe the
information specified on the type plate.
Typ VMI 07 VMI 10 VMI 20
Characteristics measurement device
Measurement range 1...20 l/min 2...40 l/min 10...200 l/min
Accuracy ±2 % of reading
Reproducibility 1 %
Start of output signal ~ 0,5 l/min ~ 1 l/min ~ 5 l/min
Response time < 500 ms
Flow indication LED green, flow proportional flashing
Characteristics output signal
Frequency output:
- Pulse rate / K-factor 855 pulses/l
optional: 1…2000 pulses/l,
factory-set
855 pulses/l
optional: 1…1000 pulses/l,
factory-set
200 pulses/l
optional: 1…200 pulses/l,
factory-set
- Resolution 1,2 ml/pulse
optional: 1000…0,5 ml/pulse,
factory-set
1,2 ml/pulse
optional: 1000…1 ml/pulse,
factory-set
5 ml/pulse
optional: 1000…5 ml/pulse,
factory-set
- Signal shape Square wave signal yduty cycle 50:50
NPN, 2 kpull-up resistor (built-in)
- Signal current max. 20 mA, current limited
Analog output (optional):
- Signal current 4…20 mA
corresp. 0…20 l/min*
4…20 mA
corresp. 0…40 l/min*
4…20 mA
corresp. 0…200 l/min*
- max. signal current ~ 26 mA
- max. load 250 to GND
Electrical characteristics
Supply voltage 24 VDC ±10 %
Current consumption max. 80 mA
Electrical connection 4(5)-pin-plug M12x1
Electrical protection measures short-circuit proof (up to 30 V)
polarity protection (up to -30 V)
Degree of protection IP 65
Process variables
Medium to measure Water and other conductive liquids
min. conductivity of the mediums 50 µS/cm
(lower conductivity affects the accuracy)
max. medium temperature 90 °C
min. medium temperature 0 °C (not freezing)
Ambient temperature 5...70 °C
Nominal diameter DN 7 DN 10 DN 20
Nominal pressure PN 16
Process connection ½'' BSP male thread 1'' BSP male thread
* other range on request