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McCrometer Flow Meter Propeller: Water Specialties Agricultural Main Systems
Quick Answer: A McCrometer propeller flow meter in the Water Specialties agricultural main line series measures water volume in large irrigation pipes. It fits DN80 to DN1200 mains and gives about plus or minus 2 percent accuracy in clean or lightly filtered water. Send your pipe size, flow range, and signal requirement to Silver Automation Instruments for a selection.
Irrigation districts and large farms need a total volume number for water allocation and billing. A McCrometer Flow Meter Propeller in Water Specialties agricultural main systems gives that number with one moving part and low pressure drop. It works on main lines from DN80 up to DN1200.
Because agricultural water often carries sand, silt, and algae, the meter must be simple to flush and repair. Many users in Vietnam, the Philippines, Mexico, and Australia choose propeller meters for this reason. They cost less than electromagnetic or ultrasonic meters in large diameters and they survive long duty cycles.
How the Water Specialties Propeller Meter Works
Water velocity turns the propeller. A magnetic pickup or gear drive sends a pulse or turns a mechanical counter. The pulse rate is proportional to flow velocity. A converter can change the pulse to 4-20 mA for SCADA or RTU input.
The meter reads flow rate and total volume. It works only when the pipe is full. It does not measure mass. Irrigation water is usually clean enough for this design. If the water is saline or brackish, choose materials with stainless steel bearings.
Key Specifications for Agricultural Main Service
Typical Water Specialties agricultural main meters cover DN80 to DN1200. Accuracy is about plus or minus 2 percent of actual flow over a 10 to 1 turndown. Flanged models often meet PN10 or PN16. Water temperature limit is usually 4 to 50 degrees C.
Velocity is more important than pipe size alone. The best accuracy zone is 0.3 to 3 m/s. Above 6 m/s, bearing wear increases. Below 0.15 m/s, the propeller may stall. Output options include a local mechanical register, a dry contact pulse, and 4-20 mA. Pulse output can be scaled to one pulse per m3 or one pulse per 10 m3 depending on the register and pipe size.
Installation Rules and Straight Run
A propeller meter needs about 5 pipe diameters upstream and 2 diameters downstream. For a DN400 main, that means 2 meters before the meter and 0.8 meter after. Most pump stations have this room. Compact skids often do not. In practice, most irrigation mains have long straight runs after the pump station. That helps.
We have seen a customer in the Philippines install a DN300 main line meter 0.7 meter after a 90 degree elbow. The totalizer overread by 8 percent at peak flow. A straightening vane reduced the error. Avoid that layout from the start.
Air also causes overreading. Place the meter at a low point or horizontal run that stays full. Do not install it at the top of a pipe rise where air collects.
McCrometer Water Specialties Models for Main Systems
The Water Specialties line includes flanged full bore meters and saddle meters. Flanged models such as the ML04 and ML06 are common in fixed irrigation
In practice, a flanged meter is easier to maintain. A saddle meter is better for retrofit on an old pipeline that cannot be shut down for long. Both styles work with local registers, pulse output, and 4-20 mA converters.
Common Irrigation Water Problems
Sand and silt eat the bearing and propeller. A screen filter or settling basin before the meter helps. For high sand loads, choose ceramic bearings and hardened propeller material. Check the register for condensation every season.
Algae and snails can jam the propeller. A customer in Australia dealing with channel irrigation found snail shells in the meter body every three months. They added a coarse strainer upstream and reduced cleaning from four times a month to once a quarter.
Replacement and Sourcing Support
Silver Automation Instruments supplies industrial flow meters and supports irrigation metering projects. We can provide a propeller meter, a local totalizer, a pulse to 4-20 mA converter, and a pressure transmitter on the same line. For existing McCrometer Water Specialties installations, we help with replacement flow tubes and register heads.
We work with small and medium water districts and farm groups in Southeast Asia, the Middle East, Africa, Latin America, and Oceania. We keep the process simple. Send us one email with your pipe size, flow range, and output signal. We will return a model selection and price.
How to Request a Quote
Tell us the pipe size in DN, the normal and maximum flow in m3/h, the operating pressure in bar, the water temperature in degrees C, the water quality, and the output signal you need. Also state if the meter is for a new line or a retrofit. This helps us select the right Water Specialties style propeller meter.
Contact Silver Automation Instruments. Tel: +86-25-68650347. WhatsApp: +86-25-52155837. WeChat: +86 15365082610. You can also visit flow-meter.com.au for product information.
FAQ: McCrometer Propeller Flow Meter for Agricultural Main Lines
What pipe sizes can a Water Specialties agricultural propeller meter cover? Most sizes run from DN80 to DN1200. Flanged models handle the lower and middle range. Saddle models are used for large concrete or steel mains.
Can a propeller meter handle sand or silt? It can handle light sand if the bearings and propeller are hard material such as ceramic or tungsten carbide. Heavy sand will shorten service life. Put a screen filter or settling basin upstream.
Do I need long straight runs? Yes. Use about 5 pipe diameters upstream and 2 diameters downstream. If space is tight, add a straightening vane.
What output signals are available? Local mechanical register, dry contact pulse, and 4-20 mA are common. A pulse to 4-20 mA converter can feed SCADA or a remote totalizer.
Can I replace only the flow tube or register on an existing McCrometer meter? Yes. We often supply replacement flow tubes, bearing kits, and register heads. Send the meter model, size, and a photo of the existing installation.