Why source flow sensors locally for your project
When a water pump, cooling loop or liquid-dosing system must behave predictably, the right flow sensor turns guesswork into repeatable performance. Communica stocks a wide range of mechanical and electronic flow sensors so South African makers, students and procurement teams get immediate access to parts, accessories and practical support - reducing lead times and avoiding import delays.
Benefits for local buyers
- Immediate branch pickup from Samrand, Pretoria CBD or Cape Town to avoid shipping waits.
- VAT invoices and account quotes tailored for education and business procurement.
- Hands-on advice for sensor selection, wiring and mounting from experienced staff.
Quick selection checklist
Start by matching the fluid type, expected flow range, signal type, and plumbing size. Below is a concise decision path so you pick a sensor that works first time.
Key criteria
- Fluid: clean water, glycol mix, oil, or corrosive liquids - choose wetted materials accordingly.
- Flow range: pick a sensor with a measurable range that brackets your operating point (e.g., 0.1-2 L/min vs 1-30 L/min).
- Output: pulse, frequency, 4-20 mA, 0-5 V, or TTL - ensure compatibility with your microcontroller or PLC.
- Pipe size and fitting: thread or compression fittings must match existing plumbing to avoid adapters that add leaks or pressure drop.
Popular types stocked
For student labs and prototypes, we commonly see turbine and Hall-effect paddlewheel sensors (pulse output) and ultrasonic clamp-on sensors for non-invasive measurement. Inline thermal mass flow sensors and 4-20 mA industrial transmitters are available where process control is required. See product categories on our Collections for a complete view.
Specification callouts & compatibility guidance
When comparing datasheets, focus on these specification callouts: operating pressure, temperature range, minimum measurable flow, accuracy, and output conditioning. If you need a TTL pulse for an Arduino, confirm the sensor's open-collector or push-pull arrangement; if you need an industrial loop, confirm 4-20 mA scaling and loop power type.
| Type | Typical Output | Best for |
|---|---|---|
| Turbine / Paddlewheel | Pulse / Frequency | Low-cost water flow measurement, microcontrollers |
| Ultrasonic (Clamp-on) | Analogue / Frequency | Non-invasive measurement, rented systems, education demos |
| Thermal Mass | Analogue / 4-20 mA | Low-flow liquid/gas, chemical dosing accuracy |
If you want to compare sensor brands and modules, browse our Shop by Brand page to find items from maker-favourite suppliers and industrial manufacturers carried by Communica.
