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Compound Flow Meter: Dual Mechanical Dial Utility Sizers for Varying Demand
Quick Answer: A compound flow meter from Silver Automation Instruments combines a low flow chamber and a high flow chamber in one body. Dual mechanical dial registers total water volume without external power. Silver Instruments supplies these dual mechanical dial utility sizers for utility lines where demand swings from a small night flow to a large peak flow.
Why a Dual Dial Compound Meter Fits Varying Demand
A standard single chamber meter loses accuracy below its minimum range. Many water networks operate at 2 to 5 percent of peak flow at night. A compound flow meter solves this problem with two measuring elements. The low flow element takes over at small flows. The main element opens when demand increases.
Because the two registers are mechanical, the meter does not need 24 volt DC or loop power. Silver Instruments has supplied these meters to utility customers in the Philippines, Indonesia, Mexico, and Saudi Arabia. In practice, a DN100 compound flow meter works well on a 100 mm line with peak flow around 90 cubic meters per hour and night flow below 2 cubic meters per hour. Most engineers skip the electromagnetic option for this profile because the compound meter costs less and needs no power supply.
How the Dual Mechanical Dial Register Works
Each measuring element has its own mechanical dial. One dial records the low flow chamber total. The other dial records the high flow chamber total. A technician reads both dials and adds the values during a billing cycle or water audit. No software, no handheld configurator, no battery. The dials are sealed in a glass register housing with IP65 protection on most Silver Instruments models.
An optional reed sensor can send a pulse to a remote totalizer or SCADA input. The mechanical dial still runs even if the sensor is removed. This matters in remote pumping stations where a power failure should not stop billing data.
Utility Sizing Considerations
Do not size a compound flow meter only by pipe size. Start with the minimum night flow and the maximum hourly demand. The low flow chamber must cover leaks, small base flows, and off peak consumption. The high flow chamber must cover peak demand without staying below 10 percent of its range for long periods.
Typical sizing pairs from Silver Instruments follow this pattern. A DN50 compound meter handles a low flow from 0.08 to 3 cubic meters per hour and a high flow up to 40 cubic meters per hour. A DN80 unit covers 0.15 to 5 cubic meters per hour on the low side and up to 85 cubic meters per hour on the high side. A DN150 unit covers 0.5 to 12 cubic meters per hour on the low side and up to 250 cubic meters per hour on the high side. These values change with pressure, water temperature, and the local utility standard.
Typical Specifications for the Silver Instruments SICC Series
The SICC compound flow meter comes in DN50, DN80, DN100, DN150, and DN200 line sizes. The body is epoxy coated ductile iron or cast iron. Wetted internals use stainless steel and EPDM seals. Standard pressure rating is PN16. Optional PN25 and ANSI Class 150 flanges are available. The mechanical dial registers are sealed and readable in direct sunlight.
Temperature range is 0 to 50 degrees Celsius for standard cold water models. Hot water versions can be quoted up to 90 degrees Celsius. Accuracy over the combined range is within plus o
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Where These Meters Are Used
We have seen compound flow meters work well in different settings. A water cooperative in Cebu, Philippines installed a DN80 compound meter on a 3 inch distribution line serving about 1,200 households. The old single jet meter stopped reading below 2 cubic meters per hour. The new SICC unit records night flow at 0.6 cubic meters per hour and peak flow at 65 cubic meters per hour.
A mining camp in Western Australia uses a DN100 compound meter for raw water supply. The camp demand swings from 1.5 cubic meters per hour at night to 95 cubic meters per hour during morning washdown. A desalination plant in Chile uses two DN150 compound meters on permeate transfer lines because the flow varies with tank level and export pump scheduling.
Installation and Maintenance Tips
Install the meter with the dial facing upward or at a 45 degree angle for easy reading. Keep the pipeline full during operation. Use an upstream strainer to protect the low flow chamber from sand and welding slag. Do not use the meter in reverse flow unless a check valve and reverse flow option are specified. Flush new piping before installing the meter.
Maintenance is mostly visual. Check the dial movement during a known night flow. If the low flow dial does not move, inspect the strainer and the changeover valve. Most field repairs do not require removing the meter body from the line.
Request a Quote from Silver Automation Instruments
Send us your minimum night flow, maximum hourly demand, pipe size (DN), pressure in bar, and water temperature in degrees Celsius. We will confirm the correct compound flow meter size and quote a complete package with flange kits or pulse output. Contact Silver Instruments by Tel: +86-135-1213-1526, WhatsApp: 86-135-12131526, or WeChat: +86 13512131526. You can also visit flow-meter.com.au for more product details.
FAQ: Compound Flow Meter with Dual Mechanical Dial
What is a compound flow meter with dual mechanical dial registers?
It is a water meter that combines a low flow element and a high flow element in one body. Two mechanical dials record flow totals without external power. This design keeps accuracy across a wide flow range.
What line sizes are available?
Silver Instruments supplies DN50, DN80, DN100, DN150, and DN200 sizes. Larger sizes can be evaluated case by case for industrial or bulk water transfer lines.
Which utilities should use this meter?
Water districts, rural cooperatives, mining camps, industrial parks, and municipal supply lines with large demand swings. The compound flow meter helps when night flow is too low for a standard mechanical meter.
Can I add pulse or 4-20 mA output to a mechanical dial compound meter?
Yes. Silver Instruments can add a reed sensor or transmitter while keeping the mechanical dial registers. This output connects to SCADA, telemetry, or a flow computer.
How do I request a quote for a compound flow meter?
Send your pipe size (DN), minimum night flow, maximum hourly flow, pressure in bar, and water temperature in degrees Celsius to Silver Instruments. Use Tel: +86-135-1213-1526, WhatsApp: 86-135-12131526, or WeChat: +86 13512131526.
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