EZO pH Circuit

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Product Description

EZO pH Circuit

EZO-pH EZO pH Circuit Operating principle
A pH (potential of Hydrogen) probe measures the hydrogen ion activity in a liquid. At the tip of a pH probe is a glass membrane. This glass membrane permits hydrogen ions from the liquid being measured to defuse into the outer layer of the glass, while larger ions remain in the solution. The difference in the concentration of hydrogen ions (outside the probe vs. inside the probe) creates a VERY small current. This current is proportional to the concentration of hydrogen ions in the liquid being measured.

EZO-pH EZO pH Circuit Dimensions


EZO-pH EZO pH Circuit Power consumption

	LED	MAX	STANDBY	SLEEP
5V	ON	18.3 mA	16 mA	1.16 mA
	OFF	13.8 mA	13.8 mA
3.3V	ON	14.5 mA	13.9 mA	0.995 mA
	OFF	13.3 mA	13.3 mA

EZO-pH EZO pH Circuit Absolute max ratings

Parameter	MIN	YP	MAX
Storage temperature (EZO™ pH)	-65 °C		125 °C
Operational temperature (EZO™ pH)	-40 °C	25 °C	85 °C
VCC	3.3V	5V	5.5V

EZO-pH EZO pH Circuit Specifications

Reads	pH
Range	0.001 - 14.000
Accuracy	+/- 0.002
Max rate	1 reading per sec
Supported probes	Any type & brand
Calibration	1, 2, 3 point
Temp compensation	Yes
Data protocol	UART & I2C
Default I2C address	99 (0x63)
Operating voltage	3.3V - 5V
Data format	ASCII
Circuit dimensions	13.97mm x 20.16mm (0.55" x 0.79")
Weight	1.76 grams