Gravity: Analog Spear Tip pH Sensor

SKU: SEN0249

Gravity: Analog Spear Tip pH Sensor stands out with its unique spear tip design, enabling direct measurement of semi-solid materials like soil and food, and is built for durability with a PTFE salt bridge and Polyoxymethylene shell. It provides precise readings within a 0-10pH range with ±0.1pH accuracy, suitable for temperatures between 5-60°C. Additionally, it includes a signal conditioner board for seamless integration, supporting a 5V input and 0-4V output with standard Gravity/BNC connectors, making it an ideal choice for accurate and reliable pH measurement in semi-solid materials applications.

Downloadable Resources

Layout

Schematics

Docs

Tech Specs

1. Getting Started

This guide covers the assembly of the spear tip shield and calibration of a pH probe, emphasizing accurate measurement techniques and the importance of using standard solutions and a stable power supply.

2. Example Code for Arduino-Measure pH of Semisolid Material

This tutorial will demonstrate how to use this spear tip pH probe to measure the pH value of semisolid material,such as soil and food. Users can learn how to set up the hardware, and measure different semisolid materials (like fruit, meat, and wet soil) using Arduino.

Reference

This article discusses the correlation between output voltage and pH values at 25°C, offering detailed operation and maintenance instructions for laboratory pH probes, ensuring proper use and longevity.

Parameter	Specification
Measuring Range	0~10pH
Accuracy	± 0.1pH
Operating Temperature	5~60 ℃
Response Time	≤2min(in standard buffer solution)
Salt Bridge Material	Poly Tetra Fluoro Ethylene (PTFE)
Shell Material	Polyoxymethylene (POM)
Filling Solution	Can NOT be Filled
Wiring Connector	BNC
Wire Length	850mm (BNC connector included)

Parameter	Specification
Input Power	5.00V
Ouput Signal	0 ~ 4.0V
Accuracy	< ±0.2pH (25 ℃)
Probe Connector	BNC
Module Connector	Gravity:PH2.0-3Pin
Dimension	43mm×32mm(1.69inch*1.26inch)

No.	Name	Description
1	A	Analog signal output (0~4.0V)
2	+	Positive power supply (5.0V)
3	-	Negative power supply (GND)
4	BNC	pH probe connector

FAQ

Hello, I would like to know if this sensor can be permanently measuring and if it is waterproof, and how long is the cable

Sorry, this is a laboratory level probe, not industrial level, so it can not be left in soil for a long time.
Hi DF, how long does the probe need to be calibrated?

The probe needs to be calibrated with a standard buffer solution before each use. In addition, the probe should be calibrated again after 2 hours of use.
How to properly store the pH probe?

Please add 3.0mol/L KCL(potassium chloride) solution at a height of about 10 mm to the protective solution bottle,and install it on the front of the probe. Put the probe back into the box and store at room temperature.

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Gravity: Analog Spear Tip pH Sensor

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