E-201-C Composite Electrode PH Level Sensor Kit


This product is discontinued due to instability of output, we are looking for better model for this.


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SKU: MDU-SEN-E201C-KIT Category: Tags: , , , ,
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Read this before use : The probe is already immersed in calibration salt water solution, kindly store the salt water solution when you want to use the probe for future re-calibration purposes. Make sure the salt water solution inside the probe is fully removed from the probe before use, open the rubber seal at the center of the probe to create opening so you can fully remove the salt water solution. If you accidentally spill or disposed the salt water solution, you can use the bottled calibration salt to make the calibration solution again. Handle with Care!

This PH sensor Module consists of PH sensor also called as PH probe and a signal conditioning board which gives an output which is proportional to the PH Value and can be interfaced directly by any microcontroller. Suitable to be used in projects involves aquarium, hydroponics, aquaponics, laboratory equipment, etc.

The pH sensor components are usually combined into one device called a combination pH electrode. The measuring electrode is usually glass and quite fragile. Recent developments have replaced the glass with more durable solid-state sensors. The preamplifier is a signal-conditioning device. It takes the high-impedance pH electrode signal and changes it into a low impedance signal which the analyzer or transmitter can accept. The preamplifier also strengthens and stabilizes the signal, making it less susceptible to electrical noise.

pH and ORP probes are both used for measuring the acidic intensity of liquid solutions. A pH probe measures acidity on a scale from 0 to 14, with 0 being the most acidic and 14 being the most basic (alkaline). Similarly, an Oxidation-Reduction Potential (ORP) probe returns a voltage proportional to the tendency of the solution to gain or lose electrons from other substances (which is linked directly to the pH a substance).

pH value Voltage output
4 3.071 V
7 2.535 V
10 2.066 V


  • Operating voltage : 5 ? 0.2V
  • Current : <10mA
  • Detectable concentration range : PH 0 – 14
  • Response time : 5s
  • Stabilization time : 60s
  • Component Power : 0.5W
  • Operating temperature : -10 to 50?C
  • Operating humidity : 95% RH
  • Size : 42 ? 32 ? 20mm



Label Meaning Connection
VCC Power source Connect to 5V of system
GND Ground Connect to GND of system
GND Ground Connect to GND of system
PO PH sensor output Connect to analog pin
T1 Temperature sensor output 1 Connect to analog pin (Optional)
T2 Temperature sensor output 2 Connect to external temp sensor (Optional)
  • Must connect both GND to the same Ground in order to function properly!


Please read the attachments below before use!



Additional Images


This is an easy to use PH sensor kit you can use with Arduino to measure the acidity of a substance.

Package includes

  • 1 x E-201-C Composite Electrode PH Sensor Probe
  • 1 x E-201-C Signal conditioning board
  • 1 x Salt for calibration
  • Bolts and nuts


Additional information

Weight 50 g
Dimensions 200 × 80 × 40 mm