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2 Flow Meter for Water: Dual Line Main Digital Monitors
Quick Answer: A dual line main digital monitor accepts signals from two separate water flow meters and shows both flow rates on one bright display. You read total flow, instantaneous rate, or batch volumes at a glance. For DN15 to DN200 pipes and flows from 0.1 m³/h to 600 m³/h, this setup works with electromagnetic, turbine, or ultrasonic meters.
Why Use Two Water Flow Meters With One Monitor
Many water treatment plants and industrial cooling loops need to compare two streams. Inlet versus outlet, raw water versus treated water, or cold side against hot side. One dual line monitor cuts panel space and wiring. The operator sees both values without toggling screens. A sugar refinery in Thailand feeds two raw water sources at different pressures. They installed our electromagnetic flow meters and one dual line monitor to control blending. The 6 digit LED display shows flow rates in parallel. No extra PLC needed.
Which Flow Meter Types Fit the Dual Line Monitor
You can pair almost any meter with a pulse, 4-20 mA, or RS485 output. Silver Automation Instruments supplies electromagnetic flow meters with 4-20 mA and pulse for water without moving parts. For clean water lines with steady pressure, a turbine flow meter delivers a fast pulse signal. Ultrasonic clamp on meters work when you cannot cut the pipe. We have paired ultrasonic meters with a dual line monitor in a Malaysian district cooling plant. The digital monitor accepted two 4-20 mA signals from the ultrasonic transducers and displayed flow rate and totalized volume per line.
Dual Line Main Digital Monitor Hardware Features
The front panel houses two independent 6 digit LED rows. Each row shows rate in m³/h, L/s, GPM, or total in m³. The housing is IP66 rated so washdown areas like food plants are no problem. Inputs include 4-20 mA, 0-10 V, pulse, and Modbus RTU. A 24 V DC transmitter power supply is built in. You power the flow meters directly from the monitor. Alarm relays trigger when flow drops below a setpoint on either channel. An Indonesian bottled water factory uses this to detect filter clogging early.
Typical Applications Across Industries
Cooling tower makeup and blowdown lines are a classic use. One monitor shows fresh water in and blowdown water out. A wastewater plant in the Philippines uses the dual monitor to track effluent from two parallel treatment trains. Each electromagnetic flow meter sends a 4-20 mA signal to the panel. In the Middle East, a desalination plant monitors brine reject flow and permeate flow side by side. The dual line display sits in the control room, connected via RS485 over 200 meters. Chemical dosing skids also bene
Installation Tips From the Field
Keep the signal cable away from VFD motor cables. Use shielded twisted pair for 4-20 mA runs longer than 30 meters. Most engineers skip this and then see fluctuating readings. Set the damping factor to 5 seconds for groundwater pumping applications where flow surges. We have seen this on customer sites many times. For electromagnetic meters, always ground the sensor properly. The dual line monitor can read flow even with unstable power if you add a small 24 V DC UPS module. A customer in Peru did this for a remote mountain spring intake.
How to Order the Right Dual Line Monitor Package
Send us your minimum and maximum flow rate, pipe diameter, water quality, and signal preference. Our team at Silver Automation Instruments picks the right flow meter and configures the dual line monitor scaling. You get a tested set with quick start wiring diagram. We support English, Spanish, and Portuguese documentation. Contact us directly.
Silver Automation Instruments
Email: [email protected]
Tel: +86-135-1213-1526
Whatsapp: 86-135-12131526
WeChat: +86 13512131526
FAQ
Q: Can the dual line monitor totalize flow from two separate meters independently?
Yes. Each channel has its own totalizer reset via front button or remote input. You can display one rate and one total at the same time on the two rows.
Q: What is the typical accuracy with a 4-20 mA electromagnetic meter?
The monitor adds about 0.02 percent of span error. The meter itself gives ±0.5 percent of reading for water. So typical system accuracy is ±0.5 percent under stable conditions.
Q: Can I use battery powered meters with this monitor?
Only if the meter outputs a passive pulse signal and the monitor supplies no loop power. For battery meters with pulse out, connect directly to the pulse input terminals. We have verified this with our battery ultrasonic meters in Australia.
Q: Does the dual line display store data?
No onboard data logging. You can send Modbus RTU data to a paperless recorder or SCADA. We offer a 4 channel paperless recorder that logs both flow rates plus pressure and temperature.
Q: What pipe sizes can you handle with a dual flow meter setup?
From DN15 up to DN200 for inline electromagnetic or turbine meters. For larger pipes, clamp on ultrasonic meters work from DN50 to DN1200. A water utility in Ecuador monitors a DN900 line with clamp on sensors connected to our dual line monitor.
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