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HC Flow Meter Installation Guidelines: Hydrawise Smart Water Loop Setup for Landscape Irrigation
Quick Answer
Install the HC flow meter on the mainline after the backflow preventer and before any zone valves. Keep at least 10 pipe diameters of straight pipe upstream and 5 pipe diameters downstream. Wire the pulse output to the Hydrawise sensor input, set the K value from the flow meter label, and enable high flow alarms before the first irrigation cycle. For pipes above DN50 or for recycled water, a Silver Instruments electromagnetic flow meter with pulse output gives better accuracy and a longer service life.
Placement Rules for the HC Flow Meter
The best location is after the backflow preventer or master valve and before the zone valve manifold. This position captures total landscape water use for all zones. Do not install the meter before the backflow preventer because backflow discharge can confuse the reading. Keep the meter body full of water at all times. Avoid positions where air collects, such as the highest point in a loop or the suction side of a pump.
Provide at least 10 pipe diameters of straight pipe upstream. For a DN40 line that equals 400 mm of clean straight run before the meter. Provide at least 5 pipe diameters downstream. If the only available spot is close to a 90 degree elbow, move the meter or add a flow straightener. In practice, most installers skip this step. We have seen low readings on customer sites caused by turbulence from elbows and valves.
Install the meter horizontally with the dial or sensor body upright. Some installers mount it vertically on a riser. That works if flow goes upward and the line stays full. Do not install it with the sensor facing down where sediment can settle.
Pipe Sizes, Flow Ranges, and Straight Run Data
Typical HC flow meters cover pipe sizes from 3/4 inch to 1 1/2 inch. In metric terms that is DN20, DN25, and DN40. Flow ranges start near 0.5 L/min and go up to about 200 L/min depending on size. Match the meter size to the pipe. A DN20 meter on a DN50 line creates pressure drop and gives wrong K value readings. For mainlines above DN50, use a full bore electromagnetic flow meter from Silver Instruments. We have supplied DN65 and DN80 electromagnetic flow meters for irrigation pump stations in Vietnam and Saudi Arabia.
Wiring the HC Flow Meter to the Hydrawise Controller
The HC flow meter uses a two wire pulse output. Connect the red wire to the sensor power terminal on the Hydrawise controller. Connect the black wire to the sensor common terminal. Use shielded twisted pair cable for runs longer than 15 meters. Ground the shield at the controller end only. Do not run the pulse cable in the same conduit as 230 V or 400 V pump cables.
Here is the thing. Most engineers skip the shielded cable on short runs. We have seen installations work for a few months without shielded cable. Then a variable frequency drive starts and the controller logs ghost pulses. Those ghost pulses become false high flow alarms. A shielded cable costs little and fixes most noise problems.
Hydrawise Settings and Flow Alarms
Log in to the Hydrawise app. Open the Zones and Sensors screen. Add a flow meter as a sensor. Enter the K value and offset shown on the label of your flow meter model. Typical K values for HC flow meters are in the range of 0.5 to 1.5 pulses per liter depending on size, but always check the label. Enter the meter size as DN20, DN25, or DN40.
Set a High Flow Alert at 120 percent of your maximum observed zone flow. Set a Low Flow Alert at 60 percent of your lowest zone flow
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Common Mistakes We See on Customer Sites
One landscaping contractor in Manila installed a DN25 HC flow meter directly after a 90 degree elbow. The turbulence caused readings to swing by 30 percent. Moving the meter to a straight run fixed the error.
Another customer in Dubai wired the pulse cable next to a pump starter feed. The Hydrawise controller logged 16 ghost pulses per minute with no water flowing. Installing shielded cable and separating the route stopped the false alarms.
A third mistake is setting the High Flow Alert at 300 percent because the installer wanted to avoid nuisance alarms. That value is too high. A broken sprinkler line can run for hours before the flow meter reports a problem.
Industrial Upgrade Options for Larger Irrigation Loops
HC flow meters are fine for residential and light commercial landscape irrigation. For larger sites, golf courses, or pump stations with pipes above DN50, the HC flow meter may not fit or may not give the required accuracy. Silver Automation Instruments supplies electromagnetic flow meters from DN15 to DN1200. These meters handle raw water, recycled water, and fertilizer injection lines. They output 4-20 mA with HART and pulse. You can connect the pulse output to the Hydrawise controller for total flow while sending 4-20 mA to an irrigation pump PLC.
The meter body uses PTFE lining and 316L electrodes. The electromagnetic flow meter works with conductivity down to 5 µS/cm. For booster pump stations, we also supply pressure transmitters and no paper recorders.
FAQ
Question 1: What pipe size should I use for a residential landscape loop?
Answer: DN20 or DN25 fits a single family house with 10 to 30 sprinklers. DN40 fits larger yards or commercial zones. Match the flow meter size to the mainline.
Question 2: Can I install the HC flow meter vertically?
Answer: Yes if the water flows upward and the pipe stays full. Avoid vertical installation with downward flow because air pockets form.
Question 3: How do I know if the K value is correct in Hydrawise?
Answer: Compare the Hydrawise total flow to a manual water meter or a measured bucket test. Adjust the K value by the same percentage error. Repeated error above 5 percent often points to turbulence or a partially closed valve.
Question 4: What should I do if the controller shows high flow with no irrigation running?
Answer: This is often ghost pulses from a variable frequency drive or pump cable. Use shielded twisted pair cable, separate the cable route, and ground the shield at the controller. Then check for a leaking zone valve.
Question 5: Can Silver Instruments supply a flow meter for recycled water in landscape irrigation?
Answer: Yes. We supply electromagnetic flow meters with pulse output for recycled water lines. Send us your pipe size (DN), flow range in L/min or m3/h, and pressure in bar. We will quote an industrial meter that connects to Hydrawise or a site PLC.
Need a flow meter for a landscape irrigation pump station or a larger commercial site? Send us your pipe size (DN), flow range in L/min or m3/h, pressure in bar, and water quality details. Our engineers will recommend an electromagnetic or ultrasonic flow meter from Silver Automation Instruments. You can reach us at Tel: +86-25-68650347, WhatsApp: +86-25-52155837, or WeChat: +86 15365082610.
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