Flow sensors in stock across South Africa
Find widely compatible liquid and gas flow sensors held locally at Communica so you can prototype, commission or repair without long import delays. We stock analogue, pulse and digital output options from maker-friendly brands and industrial component lines - ideal for university projects, HVAC troubleshooting, water metering prototypes and OEM small-batch builds. Local stock means faster collection from Samrand, Pretoria or Cape Town branches and VAT invoices for education and company procurement.
Why local stock matters now
Lead times on sensors can halt a student lab or production run. Because Communica maintains a national footprint and warehouse in Samrand, you can check availability and choose branch pickup to avoid courier delays. For volume buys, request an account quote and an itemised VAT invoice to keep purchasing compliant for institutions and businesses.
Common flow sensor types and when to use them
- Turbine/paddle sensors - simple, cost-effective for water and non-corrosive liquids; good for visible flow ranges and pulse outputs.
- Thermal mass flow sensors - better for low-flow gas measurement and direct digital outputs; suited for lab gas control and small HVAC tasks.
- Ultrasonic clamp-on sensors - non-intrusive measurement on pipes; used where cutting the pipe is not acceptable.
- Hall-effect flow sensors - widely compatible with microcontrollers (pulse output), good for maker projects and education.
Specification callouts to check before you buy
Not all sensors are interchangeable. When selecting, compare: flow range, accuracy (% FS), output type (analogue voltage/current, pulse, I2C/SPI), wetted materials (for chemical compatibility), pressure rating and required supply voltage. If you’re unsure, compare candidate parts in our flow sensors collections to match application needs.
| Type | Typical Output | Best for |
|---|---|---|
| Turbine | Pulse | Water metering, irrigation demos |
| Hall-effect | Pulse / Open-drain | Microcontroller projects, EDU |
| Thermal | Analog / Digital | Low-flow gas, lab instruments |
Explore our sensor ranges and compare parts in the shop by category to narrow options: Shop by Category. For brand-specific browsing, see our brands index: Shop by Brand.
Quick wiring example for a pulse-output water flow sensor
Most hobby flow sensors expose VCC, GND and a pulse signal compatible with a digital input and interrupt on microcontrollers. Use a pull-up if required and debounce counts in software.
Sensor Wiring (3-pin)VCC -> 5VGND -> GNDSIG -> D2 (interrupt) -- pull-up 10k to VCC
A simple flow calculation after counting pulses: Flow(L/min) = (pulse_count / pulses_per_litre) / (time_seconds / 60). Keep calibration data from the datasheet or calibrate with a measured volume for better accuracy.
Need to confirm stock before you travel? Check our national availability and branch hours: Branches & Trading Hours.
