『Hunter Hydrawise Flow Meter: Programming Automated Leak Detection High-Flow Shut Off System Thresholds』Related information(flow rotameter|digital flow meter|balo meter|hydraulic flow meter|volumetric meter|positive displacement meter|pitot tube flow meter|displacement meter|cfm meter|variable area flow meter|inline flow meter|differential pressure flow meter|calibrated flow meter|velocity meter|paddle wheel flow meter|oval gear flow meter|anemometer hvac|multiphase flow meter|doppler flow meter|thorpe tube flowmeter|heat flow meter)
Hunter Hydrawise Flow Meter Programming for Automated Leak Detection and High Flow Shut Off
Quick Answer: Set the high flow threshold at 110 to 130 percent of your normal peak flow. Add a 10 to 20 second delay before shut off to avoid nuisance trips. Silver Instruments industrial flow meters with pulse or 4-20 mA output can feed the same logic with tighter accuracy for DN15 to DN300 pipes.
Why Threshold Programming Matters
Hunter Hydrawise flow meters are common in irrigation and landscape water management. The controller can read pulse output from a flow sensor and trigger automated leak detection. When flow stays above a programmed threshold for a set delay, the system closes a master valve or shuts down a pump. That is the core logic. But the real work is in setting the right threshold.
If the threshold is too low, a normal irrigation zone start can trigger a false alarm. If it is too high, a small pipe break may go unnoticed for hours. A typical residential or commercial irrigation system runs at 8 to 12 m3/h. A broken 25 mm pipe can add 3 to 5 m3/h of flow. So a threshold set at 120 percent of peak demand will catch that break without false trips. Engineers should log flow for at least one full cycle before entering the value.
Step by Step Programming for Hydrawise Flow Meter Thresholds
First, verify the flow meter pulse rate or analog scaling in the Hydrawise controller. Many Hunter flow sensors output 1 pulse per 0.5 liter or 1 pulse per 1 liter. The controller uses this rate to calculate flow. Then set the high flow threshold in the flow meter settings. Enter the value in liters per minute or cubic meters per hour depending on the controller version. After that, set the shut off delay. A delay of 10 seconds works for small pipes with fast valve response. For larger systems with slow air vents or long pipe runs, use 20 to 30 seconds. Finally, test the system with a simulated leak if the controller supports manual override.
Choosing the Right Threshold Values
In practice, we have seen many users skip data logging. They enter a number from the pipe size chart and then call support when the system trips at night. Here is the thing. A threshold is not a pipe rating. It is a deviation from your normal operating envelope. For a cooling tower makeup line with constant flow, set the high flow threshold at 110 percent of normal. For a batch process with short high flow pulses, use 130 percent and a longer delay of 30 seconds. For a pump station feeding a rural water network in the Philippines, a DN150 electromagnetic flow meter from Silver Instruments detected a leak of 4 m3/h against a normal flow of 60 m3/h. The threshold was 66 m3/h with a 15 second delay.
Silver Instruments Flow Meters for Leak Detection and High Flow Shut Off
Hunter Hydrawise works well for irrigation. But industrial sites need more than a plastic impeller sensor. Silver I
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Common Programming Problems and Fixes
One issue we see on customer sites is pulse signal loss. Long cable runs from the flow meter to the controller can pick up noise from VFD drives. Use a shielded cable and keep the pulse wires away from power cables. Another problem is wrong units. A user in Indonesia entered liters per minute into a field that expected cubic meters per hour. The controller shut the valve every morning. That single mistake caused three days of downtime. So always check the unit before saving. If the flow meter has an analog output, set the 4 mA and 20 mA scaling to match the controller input. Silver Instruments flow meters have a local display that shows both flow rate and total, which makes the verification faster.
FAQ: Hunter Hydrawise Flow Meter Thresholds
Q1: What is a good high flow shut off threshold for a Hydrawise flow meter?
A: Start at 120 percent of your highest normal flow. Log flow for one week and set the threshold just above that peak.
Q2: How much delay should I use before the high flow shut off triggers?
A: Use 10 seconds for small systems and 20 to 30 seconds for large systems with slow air venting.
Q3: Can I use a Silver Instruments flow meter with Hydrawise?
A: Yes. Silver Instruments flow meters with pulse output or 4-20 mA can connect to Hydrawise compatible input. Check the pulse rate and scaling first.
Q4: Which Silver Instruments flow meter is best for water leak detection?
A: For clean water, use an electromagnetic flow meter. For diesel or oil, use an oval gear flow meter. For large pipes, use a clamp on ultrasonic flow meter.
Q5: How do I reset the high flow alarm after a shut off?
A: The controller usually has an alarm clear function. Some systems support automatic reset after a set time. Check the Hydrawise user manual for alarm reset options.
Contact Silver Automation Instruments for flow meter selection and high flow shut off setup. Send us your flow range, pipe size, pressure, and temperature. Tel: +86-25-68650347, Whatsapp: +86-25-52155837, WeChat: +86 15365082610.
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