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RV Water Flow Meter: Inline Volumetric Sensors for Campground Hoses
Quick Answer: An inline volumetric sensor mounted on a campground hose gives you per site water usage data accurate to 0.5 percent. Silver Automation Instruments supplies oval gear flow meters in DN15 and DN20 that output a pulse for every liter and work from 0.5 L/h upwards. Operators use these meters for automated guest billing, leak alarms, and water conservation programs in Australia, Thailand, and South Africa.
Most RV parks still charge a flat water fee. That model rewards waste. Screw a compact oval gear meter into the supply pipe at each site and you switch to pay per use. Guests who use less pay less. The campground reduces its total water pump runtime. We have seen a park cut consumption 20 percent in the first three months, just by making usage visible.
Here is the thing. A paddle wheel sensor can miss the low flow when a guest washes hands or fills a dog bowl. A volumetric oval gear sensor catches those tiny draws. The two oval gears trap a known volume between the housing and the gear teeth. One rotation always displaces exactly, say, 0.013 liters. The meter generates a pulse per rotation. No straight pipe run. No minimum velocity. From 0.5 L/h to 600 L/h, the reading stays stable.
Why Oval Gear Sensors for Campground Hoses
Oval gear meters are positive displacement devices. They do not care about flow profile or turbulence. The accuracy is plus minus 0.5 percent of actual volume. That is accurate enough for sub metering invoices. A campground in Queensland, Australia replaced 40 old mechanical dial meters with our OGM DN15 brass meters. The old meters jammed when fine sand from the bore water stuck the impeller. We added a 200 micron Y strainer before each meter. The gears now spin freely. The operator recovered the hardware cost in eight months just from reduced water cartage fees.
The standard sensor body is brass. For drinking water loops we offer lead free brass or 316L stainless steel wetted parts. The pulse output is NPN open collector, so you wire it directly to a remote counter, a PLC, or our R200 paperless recorder. If the control kiosk sits 100 meters away, order the meter with an integrated 4-20 mA HART transmitter. It runs on 24 VDC and stands up to 10 bar water pressure at 20 degrees C. For pumped lines that hit 30 bar, we have the HP version rated to 40 bar.
Field Installation and Setup
Each meter comes with half inch NPT male threads. Use a brass quick connect adaptor to snap onto a standard campground hose. Flow direction is marked on the body. Install a Y strainer upstream. Mount the meter horizontally and avoid air pockets. One eco resort in Penang, Malaysia runs 60 meters with the 4-20 mA option. The signal cables run 150 meters back to a central panel. The site manager set an alarm at 50 liters per hour sustained flow. When a guest left a t
Silver Automation Instruments can pre configure large orders so every meter outputs one pulse per liter. That makes integration simple. We also supply DIN mounted totalizers with RS485 Modbus. For 200 site resorts, connect groups of meters to our multi channel input recorder. The recorder stores two years of data and exports CSV files. No paper logs. No manual reads.
FAQ
What is the smallest flow the sensor can detect? The DN15 oval gear meter starts counting at 0.5 L/h. Below that, internal slip prevents gear rotation. In real terms, a slow drip may not register, but the moment a guest opens a tap even slightly, flow jumps above 2 L/h and counting begins.
Does silt or pipe scale damage the meter? The oval gear set is sensitive to particles larger than 100 micron. Always fit a Y strainer with a 200 micron mesh ahead of the meter. Clean the strainer once a month. The gears handle occasional soft particles, but hard grit can cause wear over years. A strainer solves the problem completely.
Can the meter stay outside in rain and sun? Yes. Specify IP67 protection and add a simple sun shield on the pedestal. In Thailand, we supplied IP67 stainless meters to a coastal campground. After two monsoon seasons and salt air, all units still deliver the original accuracy. Avoid full submersion.
How do I connect the pulse output to my billing software? The NPN pulse behaves like a dry contact. Supply 24 VDC to the meter and connect the pulse wire to your counter input. We include a wiring diagram with each batch. If your system needs a different voltage level, we can add a signal converter. For Modbus ready parks, use a flow totalizer with RS485 output mounted behind the pedestal. Silver Instruments can suggest a compatible model.
Is there a wireless option for remote sites? We do not build a built in wireless transmitter. But we work with IoT partners who supply battery powered pulse loggers with NB IoT or LoRaWAN. We can recommend a logger that straps onto the meter housing and pushes data to a cloud dashboard. Tell us your site location and connectivity and we will point you to a tested combination.
Get a specific quote or request a trial unit. Send an email to [email protected] with the subject line: RV Campground Meter Inquiry. Include your water pressure in bar, the hose pipe size DN, and your typical flow range per site in L/h. We will reply within one business day with a recommended sensor and price in USD or AUD. You can also call us at +86-135-1213-1526, message on WhatsApp at 86-135-12131526, or add our WeChat at +86 13512131526. Silver Automation Instruments ships from Nanjing, China to campground operators worldwide.
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