Gravity: Analog Spear Tip pH Sensor / Meter
Kit (For Soil And Food Applications)
SKU: SEN0249
Introduction
Gravity: Analog Spear Tip pH Sensor / Meter Kit (for Soil and Food Applications) SKU: SEN0249
The pH value of the soil is an important factor affecting the growth of plants. Suitable pH value for
different plants differ from each other. The pH value of foods, such as fruit, meat and vegetable are
also an important indicator of their quality. For example, by measuring the pH value of meat, we can
determine whether the meat we bought is fresh or not.
The pH probe of this kit is attached with a spear like protection shield made of stainless steel with a
sharp tip. It can be directly stabbed into the soft semisolid material to measure the pH value, such as
wet soil or foods. But this can not be done with common pH probe, or it will be damaged.
This kit is Arduino compatible and easy to use. It helps you to quickly build a pH meter to measure
the pH value of soil or foods directly.
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It is forbidden to measure hard solid samples and semisolid samples containing sharp
particles.
Please keep the plug of the probe, signal transmitter board (especially the BNC connector)
clean and dry.
This pH probe is a laboratory electrode, which is not suitable for prolonged online testing.
Therefore, do not immerse the electrode in the measured object for a long time.
After using the pH probe, please clean it carefully.
The components of this probe which touch the measured objects have a black ABS shell, a
glass component and a silicone rubber material. Before testing the object, it is necessary to
confirm that the measured objects are not harmful to these materials.
Not suitable for measurement: oily samples, samples with higher viscosity, samples with
more fine particles.
Not suitable for non-aqueous titration.
The head of the stainless steel spear tip is sharp. Please pay attention to safety when using
it.
Specification
Spear Tip pH Probe
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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)
Signal Transmitter Board
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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)
Board Overview
No.
1
2
3
4
Name
A
+
-
BNC
Description
Analog signal output (0~4.0V)
Positive power supply (5.0V)
Negative power supply (GND)
pH probe connector
Signal Transmitter Board Pin Definition
pH Probe Characteristics
The relation between the output voltage and the pH value is shown as followed (25
℃):
Voltage (mV)
414.12
354.96
295.80
236.64
177.48
118.32
pH Value
0.00
1.00
2.00
3.00
4.00
5.00
Voltage (mV)
59.16
0.00
-59.16
-118.32
-117.48
pH Value
6.00
7.00
8.00
9.00
10.00
Tutorial
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.
Requirements
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Hardware
DFRduino UNO(or similar) x 1
Spear tip pH probe x 1
Signal Transmitter Board x 1
Stainless Steel Spear Tip Shield x 1
Gravity Analog Cable 3pin(or Dupont Wires) x 1
pH 4.0 standard buffer solution x 1
pH 7.0 standard buffer solution x 1
Software
Arduino IDE (V1.0.x, V1.6.x or V1.8.x), Click to Download Arduino IDE from Arduino®
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Spear Tip Shield Installation
Before measuring the semisolid material, the attached stainless steel spear tip shield should be
installed first to protect the glass probe.
If you want to immerse the pH probe into the buffer solution to calibrate it, you could install the spear
tip shield after finishing calibration.
First, unscrew the protective solution bottle and pull out the top cap with rubber pad from the probe.
Then, unscrew the fixed ring and carefully insert the spear tip shield to the probe. Finally, screw the
fixed ring back to the probe to hold the shield.
The following diagram below shows how to install the spear tip shield to the probe step by step.
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