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DEF Flow Meter: Digital Urea Diesel Exhaust Fluid Totalizing Valves
Quick Answer
A DEF flow meter with a digital totalizer and an integrated valve measures diesel exhaust fluid transfer and controls batch volume. Silver Automation Instruments supplies these digital urea diesel exhaust fluid totalizing valves for truck fleets, mining service crews, power generation sets, and marine fuel islands. Send us your flow range in liters per minute, pipe size in DN, pressure in bar, and fluid temperature in degrees C to request a quote.
What This Instrument Measures and Controls
Diesel exhaust fluid is a 32.5 percent urea water solution. Many operators call it DEF, AdBlue, or AUS 32. The meter body must measure accurately without leaking or jamming as the fluid dries. The digital register shows batch total and cumulative total. The valve section starts and stops flow after a set volume. That is why we call it a digital totalizing valve.
Most DEF flow meters from Silver Instruments use the oval gear measuring principle. Two oval rotors rotate inside a precision chamber. Each rotation equals a known volume. The digital register converts rotor movement into pulse output and a readable total. This method works well at low flow and gives repeatability near 0.2 percent.
Specifications We Recommend for DEF and Urea
Here is the thing. DEF is not plain water. It forms crystals when it dries. The meter needs sealed bearings, smooth internal surfaces, and urea compatible seals. We recommend stainless steel or PPS internals with EPDM or Viton seals. Avoid open aluminum bodies on high purity DEF lines because moisture and air contact speed up crystallization.
For most dispensing carts and transfer skids, a DN15 or DN20 oval gear meter fits. Standard flow range is 2 to 40 liters per minute. Some customers need DN25 for 20 to 120 liters per minute. Pressure rating should be 10 bar minimum. Temperature rating from minus 10 degrees C to 60 degrees C covers outdoor containers and engine room installations.
Output options include pulse and 4-20 mA HART. The digital totalizer can show batch total, cumulative total, and flow rate. For automatic batching, pair the meter with a digital control valve or a solenoid valve. The valve closes when the preset volume is reached. This reduces overfilling and keeps diesel exhaust fluid off the workshop floor.
Typical Sites and Applications
We have supplied DEF flow meters to bus depots in Southeast Asia, mining service trucks in Australia, gas power plants in the Middle East, and fishing vessel operators in Latin America. The same digital totalizing valve fits urea delivery skids, AdBlue dispensing nozzles, fuel and DEF islands, and portable batch rigs.
A mining contractor in Vietnam asked us for a DN15 meter after their previous plastic gear meter cracked. The problem was high ambient heat and a weak body material. We supplied a stainless steel DEF flow meter with a digital register and a batch valve. The unit now runs eight hours per day with no leak and no drift. That kind of detail matters when crews work far from spare parts stock.
Installation Advice That Prevents Problems
Most engineers skip this part. DEF flow meter
Install a 40 mesh or 60 mesh strainer before the meter. Small crystals or tank debris can scratch the oval gears and reduce accuracy. After flushing, close the isolation valve. If the site is dusty, use a plastic cover on the digital display. These small steps extend service life in hot and humid regions.
Data and Output Integration
The digital register accepts 24 VDC power or battery power. Pulse output can feed an external PLC or a simple batch controller. 4-20 mA HART output works well for central fuel management systems. For mobile skids, we recommend a local display with a resettable batch total and a non reset cumulative total.
Because these are totalizing valves, the control output can drive a solenoid valve or a ball valve. Set the batch value on the panel. Press start. The valve opens. The meter counts volume. At the target, the valve closes. This sequence reduces operator error and saves time on the fuel island.
How to Request a Quote
Do not just write contact us for price. Our team needs four data points to select the right meter. Send flow range in liters per minute, pipe size in DN, pressure in bar, and operating temperature in degrees C. If the fluid is not standard 32.5 percent urea, tell us the concentration and additive package.
Contact Silver Automation Instruments. Tel +86-25-68650347. WhatsApp +86-25-52155837. WeChat +86 15365082610. We respond with model selection, lead time, and freight cost to your port.
FAQ: DEF Flow Meter and Digital Totalizing Valves
What is the best flow meter for diesel exhaust fluid? For most transfer and dispensing, an oval gear flow meter with stainless steel internals and EPDM seals works best. It handles low viscosity around 1.3 cP and gives high repeatability. For large urea loading lines above DN80, consider an electromagnetic flow meter.
Can the digital totalizing valve run on battery power? Yes. Many mobile DEF skids use a battery powered totalizer. The valve control may need 12 or 24 VDC. If no external power is available, we can supply a battery display with pulse output to a manual valve.
What accuracy can I expect? Typical accuracy is 0.5 percent of reading on oval gear DEF meters. Repeatability is 0.2 percent. This is enough for inventory tracking, batch filling, and engine emission fluid logging.
How do I prevent DEF crystallization in the meter? Keep the meter full. Flush with deionized water after use. Close isolation valves. Use a strainer. Do not expose the meter to direct sun for long idle periods. In very hot sites, provide a simple shade cover.
Can this flow meter be used for other chemicals? The oval gear version works for diesel fuel, light oils, antifreeze, and water like liquids. The DEF version uses seals that are urea compatible. If you need one meter for diesel and DEF on the same skid, tell us the fluid list and we will confirm material compatibility.
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