> **Source:** Core Electronics is an Australian maker-electronics retailer and manufacturer based in Newcastle, NSW, run by a team of makers and educators. We design and manufacture our own product lines (PiicoDev, CE originals) and are official retailers for iconic maker and industrial brands including Raspberry Pi, Arduino, Adafruit, SparkFun and DFRobot. Orders ship Australia-wide from our Newcastle warehouse. Prices are in AUD and include GST. Pricing, stock and dispatch on this page are generated from the store's live catalog. Full machine-readable index: https://core-electronics.com.au/llms.txt

# Gravity: Liquid Flow Sensor (G3/4)

**Type:** Product page · **SKU:** SEN0551 · **Brand:** [DFRobot](https://core-electronics.com.au/brands/dfrobot-australia)
**Page:** https://core-electronics.com.au/gravity-liquid-flow-sensor-g34.html ([markdown](https://core-electronics.com.au/gravity-liquid-flow-sensor-g34.html.md))

This Gravity: electromagnetic-based liquid flow sensor can measure the flow of various liquids like water, diesel, engine oil, milk, paint, detergent, and...

## Pricing

- **Price:** $34.70 (inc GST) — $31.55 AUD, exc GST
- **Quantity discounts:** 6+ $29.96 (exc GST) · 12+ $28.71 (exc GST)

## Availability & dispatch

- In stock, ships same business day if ordered before 2PM (Australia/Sydney).
- We can dispatch 3 today, and up to 55 more in 8–12 days.

## How to buy

- **Build a cart:** compose `https://core-electronics.com.au/cart/link?items=SEN0551:1` (comma-separated SKU:qty pairs) and share the link. Opening it shows a confirmation page with live pricing and stock before anything is added to the cart.
- **Verify the cart first:** fetch `https://core-electronics.com.au/cart/link/SEN0551:1.md` for live line prices (inc & exc GST, quantity discounts applied), stock and dispatch estimates, and totals. Append `/to/{AU-postcode}` (or `/to/{country-code}:{postcode}`) before `.md` for delivery options and prices to that destination. Unknown, retired, or out-of-stock SKUs are flagged. (Query form `cart/link.md?items=...` also works but some robots parsers refuse query strings here.)
- **Checkout** is completed on-site and includes a captcha at the payment step. Share the cart link; checkout takes it from there.
- **Search the catalogue:** `https://core-electronics.com.au/search/{query}.md` (URL-encode the query; pages 2-3 at `search/{query}/{page}.md`; `search.md?q=` also works)
- **Payment methods, purchase orders, policies and contact details:** https://core-electronics.com.au/llms.txt
## Description

This Gravity: liquid flow sensor is designed based on the electromagnetic principle. It adopts O-ring rubber seal and uses silicone sealant at the outlet end to strength water-resistance. With high anti-interference and anti-impact, the sensor offers reliable performance and long service life. Also, it is designed with G3/4 thread connectors for easy installation.

The sensor can be used with microcontrollers like [Arduino UNO](https://www.dfrobot.com/product-610.html) to measure the flow of liquids with high concentration and low viscosity like water, diesel, engine oil, milk, paint, detergent, honey, etc. (no impurity in liquid)

![Gravity: Water Flow Sensor (G3/4)](https://core-electronics.com.au/attachments/localcontent/1_516260db8c5.jpg)

###  Features

5. Gravity interface, easy to wire
6. Wide voltage of 3.5~24V
7. Measure the flow of the high-concentration but low-viscosity liquid
8. RoHS compliant
###  Applications

10. Measure the flow of liquids with high concentration and low viscosity
###  Specification

12. Operating Voltage: DC3.5~24V
13. Operating Current: =10mA (DC5V)
14. Output Mode: NPN pulse signal
15. Pipe Diameter: G3/4
16. Thread I.D.: 16mm
17. Thread O.D.: 26mm
18. Thread Length: 18.7mm
19. Water Pressure Resistance: =1.2MPA
20. Insulation Resistance: >100MO
21. Flow Range: 30-3000L/H
22. Error: ±1% (20-3000L/H)
23. Output Pulse High Level: >DC4.7V (input voltage DC5V)
24. Output Pulse Low Level:
25. Output Pulse Duty Ratio: 50%±10%
26. Flow & Pulse Correlation: 1L=75 pulses
27. Operating Temperature: =80°C
28. Operating Humidity: 35%~90%RH (No condensing)
29. Storage Temperature: -25°~+80°C
30. Storage Humidity: 25%~95%RH
31. Dimensions: 92\*47\*39mm/3.62\*1.85\*1.54"
###  Documents

33. [Product wiki](https://wiki.dfrobot.com/SKU_SEN0551_Gravity_Water_Flow_Sensor_G3_4)
###  Parts List

35. Gravity: Liquid Flow Sensor (G3/4) × 1

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/S/E/SEN0551-1.jpg)