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Arag Orion Flow Meter: Digital Electronic Fluid Dosing System Sizing Specs
Quick Answer: The Arag Orion is a digital electronic flow meter and dosing system used mostly on agricultural sprayers and liquid application trailers. Typical units operate from 0.3 to 200 L/min at a maximum working pressure near 20 bar. For industrial chemical, fuel, or water treatment processes, Silver Instruments supplies direct replacement options with oval gear, electromagnetic, and Coriolis flow meters.
Sizing Specs You Should Record from the Orion Nameplate
Before ordering any replacement, record the flow range, K factor, connection size, supply voltage, and wetted material. In practice, plant engineers and service teams often miss the K factor. The K factor is the number of pulses per liter. It is stamped on the body or shown in the manual. This value matters because the dosing controller uses it for total flow and batch stop.
Most Arag Orion meters use 1 inch, 1 1/2 inch, or 2 inch ports. Thread type is usually BSP male or NPT male. The pulse output is a square wave, not a 4-20 mA signal. If your PLC has a standard analog input, you need a pulse converter or a flow meter with analog output. Typical Orion accuracy is around 1 percent of reading under clean water conditions. Viscosity above 10 cP or suspended solids can reduce accuracy and wear the rotor.
Pressure rating is close to 20 bar. Temperature range runs from 0 to 50 degrees C. The body material is often polypropylene, nylon, or aluminum. That is fine for water and mild fertilizer. It is not enough for hot condensate, solvent, or acid service.
When an Industrial Replacement Makes Sense
Here is the thing. Agricultural flow meters are cheap and light. But they are not built for continuous duty at extreme pH or high temperature. We have seen this on customer sites many times. A customer in Vietnam used an Orion style meter on a solvent batching line. The rotor shaft swelled after two months and the pulse signal became unstable. They replaced it with a 316 stainless steel oval gear flow meter and stopped the early failures.
Another case came from a service company in the Philippines that injected polymer into wastewater. The original meter could not handle the sticky liquid. They moved to an electromagnetic flow meter with a PTFE liner and no moving parts. The measurement stayed stable even with solids in the stream.
Silver Instruments Replacement Options for Fluid Dosing
For low flow chemical dosing and fuels, use an oval gear flow meter. Silver Instruments supplies oval gear flow meters from DN4 to DN50 with flow ranges from 0.01 to 250 L/min. Accuracy is about 0.5 percent of reading. Wetted parts ca
For water, wastewater, acid, and caustic dosing, use an electromagnetic flow meter. Silver Instruments offers DN10 to DN300 with 4-20 mA HART and Modbus. It needs a medium conductivity above 5 µS/cm. The liner can be PTFE or hard rubber. No moving parts means less maintenance in slurry or scaling service.
For batch dosing where mass matters, use a Coriolis mass flow meter. Silver Instruments Coriolis meters cover DN10 to DN100 and measure kg/h directly. Accuracy reaches 0.1 percent for mass flow and density. This option suits food additives, marine fuel blending, and chemical reactor feed.
Key Parameters to Send for a Sizing Quote
Send us your pressure (bar), temperature (°C), pipe size (DN), and flow range. Also include liquid name, viscosity in cP, conductivity in µS/cm, and available power. Because the Orion outputs a pulse, tell us whether you need a pulse input, analog output, or two relay outputs for batch stop. Silver Instruments can supply a batch display with pulse input and 4-20 mA retransmission.
FAQ on the Arag Orion Flow Meter and Industrial Replacements
Q1: Is the Arag Orion a mass flow meter?
No. It is a volumetric electronic flow meter with pulse output. It does not measure mass, density, or temperature directly.
Q2: What is the typical pressure rating for the Orion?
Most Orion meters are rated near 20 bar. Check the nameplate because some special bodies may be rated lower.
Q3: Can Silver Instruments supply a drop in replacement for the Arag Orion?
Yes. We can match connection size and flow range. You may need a pulse converter or our batch display if the controller requires 4-20 mA. Send the K factor and thread type.
Q4: What flow meter works best for chemical dosing below 1 L/min?
An oval gear flow meter with PTFE gears works well. The Silver Instruments oval gear series starts at 0.01 L/min and handles higher viscosity better than a turbine or paddle wheel meter.
Q5: How do I request a quote from Silver Instruments?
Send your pressure (bar), temperature (°C), pipe size (DN), flow range, liquid name, and power supply. Contact Silver Instruments by Tel: +86-135-1213-1526, WhatsApp: 86-135-12131526, or WeChat: +86 13512131526.
This technical note is provided by Silver Automation Instruments. We serve industrial end users and distributors in Southeast Asia, Oceania, Latin America, Africa, and the Middle East.
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