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Cumulative Flow Meter: Mechanical and Digital Volumetric Totalizer Devices
Quick Answer: A cumulative flow meter records total volume or mass passing through a pipe over time. It combines a flow sensor with a totalizer counter. Silver Automation Instruments supplies mechanical and digital volumetric totalizer devices for water, fuel oil, chemicals, food, and marine transfer.
Mechanical totalizers use geared counter wheels. Digital totalizers accept pulse, 4-20 mA, and HART signals. Both types help operators track batches, daily totals, and process inventory.
What Is a Cumulative Flow Meter Totalizer?
A cumulative flow meter totalizer adds flow volume over a period. The display may show instant flow rate and total volume. For example, a DN50 electromagnetic flow meter can show 18.5 m³/h on line one and 126.4 m³ on line two. The total count updates every 0.1 L or every pulse.
Mechanical volumetric totalizers use a gear train driven by the flow sensor. Digital totalizers count pulses or integrate an analog signal. You can read total in liters, cubic meters, gallons, or kilograms. The unit depends on the flow meter type and the process need.
Mechanical Volumetric Totalizers for Batch Control
Mechanical totalizers are common on oval gear flow meters and turbine flow meters. They do not require external power. The counter wheels rotate directly from the meter output shaft. A paint manufacturer in Malaysia uses a DN25 oval gear meter with a mechanical batch totalizer. The operator sets a target of 200 L per batch. The meter counter trips a micro switch at the target. The pump stops. Accuracy stays within ±0.5% for oil viscosity from 10 cP to 1000 cP.
Because mechanical counters need no 24 V DC supply, they fit remote storage terminals and mobile fuel skids. Here is the thing. A standard mechanical counter cannot send a 4-20 mA signal to a PLC. Some units include a pulse switch. But the signal is not isolated.
Digital Flow Totalizer Devices and Signal Input
Digital totalizers accept pulse input from oval gear, turbine, vortex, or positive displacement sensors. Many models also accept 4-20 mA HART from Coriolis, electromagnetic, and ultrasonic flow meters. A common setup in Indonesia uses a digital totalizer with a DN80 electromagnetic flow meter. The display shows flow rate in m³/h and total in m³. The totalizer sends a pulse every 0.1 m³ to a PLC.
For chemical batch control, we recommend 4-20 mA HART input. The current loop is stable over long cable runs. You can set a batch target of 500 kg for solvent transfer. The relay trips at 500 kg. The totalizer freezes the count. This setup works for acids, caustic, and solvents in Turkey and Vietnam.
Digital totalizers often include an 8 digit counter. The counter memory holds data after power loss. This feature is useful in areas with unstable grid power.
Which Industries Use Cumulative Flow Meters?
Water and wastewater plants use totalizers for daily abstraction reports. A desalination plant in Saudi Arabia monitors brine discharge with a DN200 seawater flow meter. The flow range is 80 to 400 m³/h. The digital totalizer records total cubic meters per day. Operators use this data for environmental compliance. A water utility in Chile logs daily abstraction from mountain springs with a DN100 electromagnetic flow meter.
Oil and gas terminals use mechanical batch totalizers on truck loading skids. Diesel and fuel oil batches often run from 500 to 2000 L. A fuel depot in Australia uses a DN40 oval gear meter with a mechanical cou
Food and beverage plants use sanitary totalizers for milk, syrup, and beer. A brewery in Australia uses a digital totalizer on a magnetic flow meter for yeast dosing. The batch size is 35 L per tank. Marine operators use totalizers for bunker fuel transfer. The flow meter must handle heavy fuel oil at 120 °C and 380 cSt.
How to Select a Flow Meter with a Totalizer
Start with the process data. Send us the fluid name, pressure in bar, temperature in °C, pipe size in DN or inches, and flow range in m³/h or kg/h. That information lets our engineers select the flow sensor and totalizer combination.
Then choose mechanical or digital output. Mechanical totalizers fit local batch control without power. Digital totalizers fit remote monitoring, data logging, and PLC integration.
Check the flow meter type. Oval gear meters work well for oil and viscous chemicals. Electromagnetic flow meters work well for conductive water and wastewater. Coriolis mass flow meters record kg or tons directly. No volume to mass conversion is needed. A resin plant in Malaysia uses a Coriolis meter with digital totalizer. The batch size is 800 kg per reactor. The meter sends a pulse at 0.1 kg per pulse. The PLC stops the feed valve at target weight.
Installation and Field Notes
Install the flow meter in a straight pipe section. For electromagnetic flow meters, keep straight run at 5 DN upstream and 2 DN downstream. For oval gear meters, install a strainer upstream. Solid particles damage the gears. For turbine meters, avoid rapid pressure drops. Air bubbles cause counter error. In remote sites, use battery powered totalizers. They can run for 3 to 5 years. We have seen customers in Africa use solar powered pulse totalizers for borehole water meters. Solar powered pulse totalizers work without grid power.
In practice, most engineers skip the zero check after startup. Do not skip it. Let the meter run full pipe for 10 minutes. Then verify the total count against a known volume.
FAQ: Cumulative Flow Meter Totalizer Questions
Can a mechanical totalizer send a signal to a PLC?
No. A mechanical totalizer only shows total volume. Some units include a pulse switch. But a digital totalizer is better for PLC and SCADA.
What is the difference between flow rate and cumulative flow?
Flow rate is volume per unit time. For example, 20 m³/h. Cumulative flow is total volume over time. For example, 350 m³ since morning reset.
Can the totalizer work with existing flow meters?
Yes. Many panel mounted digital totalizers accept pulse, 4-20 mA, and HART signals. Send the flow meter output type and we will check compatibility.
Do you offer ATEX rated totalizers?
Yes. We supply totalizers and flow meters for ATEX Zone 1 and Zone 2. Specify the gas group and temperature class.
Which flow meter is best for diesel batch totalizing?
An oval gear flow meter with a mechanical or digital totalizer. It handles diesel at low flow rates. Accuracy stays within ±0.5%.
Get a Quote for Your Cumulative Flow Meter
Send us your pressure in bar, temperature in °C, pipe size in DN, and flow range. Our engineers will reply with a model and price within 24 hours. Silver Automation Instruments supplies flow meter and totalizer packages from China to Southeast Asia, Oceania, Latin America, Africa, and the Middle East.
Contact Silver Instruments:
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