Sensor fluxo

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measuring

monitoring

analysing

Oval Wheel Flow Meter
For Viscous Liquids

Model: OVZ

Model: OVZ
with compact electronics

● Measuring ranges:
0.3 - 8 to 1.6 - 40 L/min liquid
● Measuring accuracy: ± 2.5 % f. s.
● pmax: 40 bar, tmax: 80 °C
● Viscosity range: 10 - 800 mm2/s
● Connection: G 1⁄4 to G 3⁄4 female
● Material:
POM, PMMA, PSU, aluminium
● Output: pulses,0(4)...20 mA,
Limit Switches
Model: OVZ

1 /08-2008

KOBOLD companies worldwide:

ARGENTINA, AUSTRIA, BELGIUM, CANADA, CHILE, CHINA, CZECHIA,
FRANCE, GERMANY, GREAT BRITAIN, INDIA, INDONESIA, ITALY,
MALAYSIA, MEXICO, NETHERLANDS, POLAND, SINGAPORE, SLOVAKIA,
SPAIN, SWITZERLAND, THAILAND, USA, VENEZUELA, VIETNAM

KOBOLD Messring GmbH
Nordring 22-24
D-65719 Hofheim/Ts.
` +49 (0) 61 92 299 - 0
Fax +49 (0) 61 92 2 33 98
E-Mail: info.de@kobold.com
Internet: www.kobold.com

Model:
OVZ...

87

Oval Wheel Flow Meter for Viscous Liquids

Application

Electronics

The model OVZ oval wheel flow meters are used to measure,
monitor and meter viscous liquids. The flow meters function
independent of viscosity in the viscosity range between 10
and 800 mm2/s. A maximumpressure loss of 1 bar has
been defined at the factory.
This results in different measuring ranges for different
viscosities. The oval gearwheels are manufactured from highquality plastic.

● Frequency output (...I401; ...I302; ...I303)
Power supply:
5 - 24 VDC
Power consumption: typically 10 mA
Pulse output:
Hall effect sensor NPN, asymmetrical,
open collector, max. 15 mA
Electr.connection: connector socket DIN 43650 (...I401)
aluminium adapter box with cable
connection (...I302)
aluminium cover box with circular
connector M12x1 (...I303)

Function
The OVZ oval wheel meter is a positive-displacement
flow meter. The measuring element comprises two toothed

● Frequency output (...I304)
Power supply:
18 - 30 VDC
Power consumption: typically 10 mA
Pulse output:
PNP,asymmetrical, open collector
max. 120 mA
Electr. connection: 2 m PVC cable
● Frequency output (...I305)
Power supply:
nominal 8.2 VDC
Pulse output:
Namur, asymmetrical,
max. approx. 3.5 mA (typ. 0.5 mA)
Electr. connection: 2 m PVC cable

precision oval gearwheels, which are driven by the liquid and
thus roll together. A fixed quantity of liquid is transported
through the chambersfor every turn of the oval-wheel pair.
Permanent magnets or stainless steel pins are embedded
in the oval gearwheels. The rotary motion is converted to
a pulse signal by electrical sensors externally fitted to the
measuring chamber. The pulse count is a measure of the flow
rate. The signals are evaluated by downstream electronics
(optional).
Technical Details:

Ambient temperature:

-10°C to + 60°C

Medium temperature:

- 10°C to + 80° C

Max. pressure:

OVZ-..1, OVZ-..2 : 10 bar
OVZ-..3, OVZ-..4 : 16 bar
OVZ-..5 : 40 bar

Accuracy:

± 2.5 % f. s.

Filter mesh size:

max. 30 µm

Material:

combination / case / cover
OVZ-..1.. / POM / POM
OVZ-..2.. / POM / PMMA
OVZ-..3.. / aluminium / PMMA
OVZ-..4.. / aluminium / PSU
OVZ-..5.. / aluminium / aluminiumovals wheels: POM
axles: stainless steel 1.4301
O-rings: NBR; option: FPM, EPDM

Frequency range:

0.3 - 9 Hz to 2 - 57 Hz

Protection:

● Compact electronics
Display:
3-digit LED
Analogue output:
(0)4...20 mA adjustable, max. 500 Ω
Switching outputs: 1 (2) semiconductor PNP or
NPN, factory setting
Contact operation: N/C, N/O programmable
Setting:
via 2 keys
Power supply:
24VDC ± 20 %, 3-wire, appr. 100 mA
Electr. connection: connector M12 x1
● Pointer indication with analogue output
Housing:
aluminium
Indication:
moving coil instrum., 240° indication
Power supply:
24 VDC ± 20 %
Output:
0 - 20 mA or 4 - 20 mA, 3-wire
Max. load:
250 Ω
Electr. connection: connector M12 x1

IP 65 (..I401, -I302,- I303,
..L 443, ..Z 3x0)
IP 67 (all others)

88...
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