Gravity Analog Dissolved Oxygen Kit - Datasheet

DO Meter V2.0
Gravity
A
+
−
pin A
Converting the analog signal
into percent saturation
r 0.1
Every dissolved oxygen probe will output a slightly different voltage. Atlas Scientific's
galvanic dissolved oxygen probe outputs ~40 – 60mV in air.
The analog voltage coming off pin A is the voltage from the probe + an 11x gain.
This means the analog voltage read on pin A is the voltage from the probe x11.
With the probe sitting in the air, watch the voltage coming into your ADC.
Wait until the readings stabilize.
Once the readings stabilize, capture the reading
and store it in permanent memory such as
EEPROM. This is your calibration value; you
don’t want to lose it.
42mV=
58mV
=
This device can be used with a different brand of galvanic D.O. probe
however, that probe may output a different voltage.
Probe output
1mV
42mV
12.63mV
Gravity pin A output
11mV
462mV
138.93mV
Example
420
450
460
462
463
462
462
462
Unstabilized
Stabilized
Percent Saturation equation