Precise gear flow meter according to displacement with internal thread connection according to DIN ISO 228, available with frequency (square wave signal) or signal converter and analogue (4 ... 20mA) output.
- Small viscosity dependence
- Wide measuring range
- MINIMESS® test points for pres-sure and temperature
 Datasheet |
| Catalog Excerpt |
- Measuring principle displacement
- Viscosity range 5 ... 500 mm²/s (cSt)
- Medium temperature -20 ... +160 °C
- Environmental temperature max. +50 °C (amplifi er)
- Storage temperature -20 ... +85 °C
- Output signal frequency (rectangle)
- Supply voltage Ub 10 ... 30 VDC
- Electrical measuring connector 4 pole device connector, M12 x 1
- Protection type (EN 60529 / IEC 529) IP 64
- Tightening torque 8 Nm (± 2 Nm)
- Calibration viscosity 30 mm²/s (cSt)
- Material casing cover 1.4305
- Material middle / bottom part 0.7060
- Material sealings FKM
- Material gear wheels 1.7131
- Suitable measuring cable customer-specifi c
 Datasheet |
- Measuring principle displacement
- Viscosity range 5 ... 500 mm²/s (cSt)
- Medium temperature -20 ... +120 °C
- Environmental temperature max. +80 °C
- Storage temperature -20 ... +85 °C
- Output signal frequency (rectangle) / 4 ... 20 mA
- Supply voltage Ub 12 ... 24 VDC
- Electrical measuring connector 5 pole device connector, M16 x 0.75
- Protection type (EN 60529 / IEC 529) IP 40
- Tightening torque < 0.5 Nm, thread pin (clamping piece) T 3362000
- Calibration viscosity 30 mm²/s (cSt)
- Material casing cover 1.4305
- Material middle / bottom part 0.7060
- Material sealings FKM
- Material gear wheels 1.7131
- Suitable measuring cable MK 01
| Datasheet |
Measuring of the volume flow rate For the measuring of the volume flow rate, pulses are evaluated as a volume per time in any flow unit whatever, e.g. l/min. Counting of the volume (quantity) For the counting of the volume, induividual pulses per gear tooth volume are added up in the instrument and are shown in freely selectable volume units.
| Datasheet |
Precise Gear flow meter according to displacement with connection via connector plate from the side or from below.
- Small viscosity dependence
- Wide measuring range
- Quick replaceable, because of plate construction
- No pipe installation necessary
- Automatic sensor detection ISDS
| Datasheet |
| Catalog Excerpt |
- Application medium acids, alkalis, corrosive fluids, cleaning agents, coolant *
- Flow range 0.03… 660 L / min
- Output signal PNP
- viscosity range max. 3000 mPas
- measuring accuracy ± 0.5% of the value M.
- Medium temperature -40… 125 ° C *
- Ambient temperature -40… 125 ° C *
- operating pressure max. 68 bar
- Housing material stainless steel *
- Material oval wheels stainless steel *
- Material seals FKM / EPDM *
- Electrical measuring connection M12 x 1
- IP protection class IP 67 (DIN EN 60529)
| Datasheet |
Precise oval wheel flow sensor according to the positive displacement principle with internal thread connection according to DIN ISO 228 and analogue PNP output signal.
- Small viscosity dependence
- Wide measuring range
- High media compatibility
- Temperature resistant up to 125°C
| Datasheet |
| Catalog Excerpt |
- The application area for Oval Wheel Meters of the family Flowal Plus encompasses the simple, reliable and costeffective measurement of liquid volumes or volumetric flow rates. They have an extremely robust design and combine years of experience with state-of-the-art technologies. They can be used in various industries, e.g. mechanical engineering, plant construction, food industry, semiconductor industry, environment industry, automotive industry, etc. Due to the available material combinations, this series is also suitable for measuring aggressive or corrosive media.
- Oval Wheel Meter of the family Flowal Plus consists of the following main components: • measuring transducer: measuring chamber with oval wheels • pulse pick up or multifunctional electronic
| Datasheet |
- DN 15 – 50
- PN 25 – 40
- Flow rates 1 – 700 l/min
- Measurement accuracy ± 0,5 %
- operating temperature according to design -10°C to + 100°C
| Datasheet |
- Ea5y dis. assembling
- Comfortabte cleanJng of filter cartrtdge
- Rugged deslgn
- Ready-for -use and well-proven soluti on
| Datasheet |
Oval Gear Flow Meters – precise volumetric measurement for viscous media
Oval gear flow meters (gear sensors) measure volumetric flow by displacement: two counter-rotating oval gears transfer the medium chamber-by-chamber; each chamber equals a defined displacement volume. From the pulses/frequency the total volume and flow rate are determined with high accuracy—ideal for oils, resins, paints/coatings, adhesives, chemicals, fuels and other high-viscosity media.
Benefits: very high accuracy and repeatability, largely viscosity independent (within wide limits), bidirectional, and no straight-run requirements. Options: heating/cooling jackets, extended pressure/temperature ratings, wear-resistant materials, ISO/DAkkS calibration, ATEX/IECEx, plus electronics with 4–20 mA/HART/Modbus/IO-Link.
ICS Schneider Messtechnik supports selection & sizing (DN, viscosity/temperature, Δp), material compatibility, calibration/linearization, integration into PLC/SCADA/IIoT and lifecycle service.
FAQ on Oval Gear Flow Meters
Answers on operating principle, accuracy, viscosity/temperature effects, materials, installation, signals, calibration, dosing and maintenance.
How does an oval gear meter work?
Two oval-shaped gears rotate synchronously in a measuring chamber. Each rotation displaces a defined partial volume. A pickup (Hall, reed, inductive) tracks gear position: pulses → volume, frequency → flow rate.
What accuracy can I expect?
Typically ±0.2…0.5% of rate in the calibrated range; repeatability often ±0.05…0.1%. With multi-point linearization, tight tolerances are achievable over a wide range.
Is the measurement viscosity independent?
Much more stable than turbine meters. Still, slip losses and temperature can affect results at extremely low or very high viscosity. Recommendation: calibrate close to process viscosity.
Which media are suitable?
Oils, pumpable greases, resins/polymers, paints/coatings, isocyanates, adhesives, bitumen emulsions, fuels, additives, acids/alkalis*. *Always verify material compatibility.
What materials are available?
| Component | Typical materials | Notes |
|---|---|---|
| Body | 316L, 1.4571, aluminium, cast, PEEK | Hygiene, chemical resistance, lightweight |
| Gears | PPS/PEEK, hardened stainless steel, anodized aluminium | Wear, chemicals, temperature |
| Bearings | Ceramic/sapphire, tungsten carbide, stainless | Low friction, service life |
| Seals | FKM/FPM, FFKM, PTFE | Media/temperature resistance |
What temperature and pressure ranges are typical?
Application-dependent: commonly −20…+180 °C (higher with heating/cooling) and PN16…PN100 or ANSI equivalents. Observe seal/material limits.
How do temperature & viscosity influence results?
Rising temperature → lower viscosity → potential over/under-registration due to internal leakage paths. Keep temperature stable (jacket) and use multi-point linearization.
How high is the pressure drop (Δp)?
Δp depends on viscosity, flow rate, clearances and DN. For very viscous media choose a larger size and/or provide a bypass.
What installation orientation is recommended?
Typically horizontal with a vent point upwards. Ensure a full pipe, provide venting/degassing, and install a filter.
What filtration is required?
Protect against particles: 80–200 µm (liquids) depending on DN/medium; finer for very clean media. Coordinate process filtration when fillers/solids are present.
How is the signal picked up?
| Output | Function | Typical use |
|---|---|---|
| Open collector / NPN/PNP | Pulse/frequency | Totalizers, PLCs, dosing |
| NAMUR / Ex i | Pulse, intrinsically safe | ATEX/IECEx zones |
| 4–20 mA | Analog flow | Control loops, long runs |
| HART/Modbus/IO-Link | Data/diagnostics | Parametrization, IIoT |
| Pulse + analog | Combined | Volume + trend |
What is the K-factor and how do I use it?
K-factor = pulses per unit volume (e.g., pulses/l). It is stated on the calibration certificate and set in the PLC/display. Multiple K-factors enable multi-point linearization.
Is the meter bidirectional?
Yes—the volumetric principle is bidirectional. With direction-sensitive electronics, forward/reverse flows can be separated.
How do I integrate into dosing/filling systems?
Pulse counting for batch/shot control with valve/pump actuation. Pre-wet/overrun compensation and temperature compensation improve repeatability.
How do I calibrate/verify?
ISO/DAkkS calibration (gravimetric/volumetric) over multiple points. In the field: comparison measurements, check meters; document traceability (serial/K-factor/medium/T).
What explosion-proof options exist?
Sensors/electronics available with ATEX/IECEx (e.g., II 2G/2D). For Ex i use NAMUR pulses with appropriate barriers/isolators.
Are hygienic/food-grade versions available?
Hygienic design with clamp fittings, 316L, FDA/EU 1935/2004-compliant seals, polished surfaces, CIP/SIP resistance—observe media and temperature limits.
What influences can distort results?
- Air entrainment/cavitation → vent properly, check pump/bypass
- Particles/abrasion → increase filtration, adapt materials
- Temperature swings → heating/cooling jacket, compensation
- Wrong K-factor setup → verify certificate, enter correctly
How do I choose the nominal size (DN)?
Select DN so the operating window stays within specified Qmin…Qmax and pressure drop remains acceptable. For thick media consider upsizing and pump capability.
What does maintenance look like?
Generally low effort. Check filters regularly, verify tightness, and after medium changes re-verify K-factor. Avoid unsuitable solvents without material approval.
Do you support selection, calibration & integration?
Yes. We size DN/Δp, specify materials/seals, provide calibration certificates, implement linearization and connect the measuring point to PLC/SCADA/cloud.