Data Sheet
Calibration theory
The Atlas Scientic EZO
™
Dissolved Oxygen circuit, has a exible calibration protocol,
allowing for single point or dual point calibration.
1. Pull off and discard cap from the Dissolved Oxygen probe.
(only used to protect probe during shipping)
2. Let the Dissolved Oxygen probe sit, exposed to air untill readings stabalize (5 – 30 sec).
3. Calibrate using the command "Cal".
4. After calibration is complete, you should see readings ~9.09 – 9.1Xmg/L.
(only if temperature, salinity and pressure compensation are at default values)
1. Stir probe in Zero D.O. calibration solution to remove trapped air, (which could cause readings to go high).
2. Let the probe sit in Zero D.O. calibration solution untill readings stabalize (0:10 – 1:30).
3. Calibrate using the command "Cal,0".
After you have calibrated using the command "Cal"
Only perform this calibration if you require accurate readings below 1.0 mg/L
Single point calibration
Calibrate rst, compensate later.
Temperature, salinity and pressure compensation values have no effect on calibration.
1
5
10
15
20
25
30
1
5
10
15
20
25
30
A
B
C
D
E
F
G
H
I
J
A
B
C
D
E
F
G
H
I
J
“Cal”
“Cal,0”
1
1
2 3
3
2
Dissolved Oxygen
TM
0:10 − 1:30
O
2
O
2
N
2
N
2
N
2
N
2
Gas
Void space
Only the gas.
(not the flame)
Trapped air
1
5
10
15
20
25
30
1
5
10
15
20
25
30
A
B
C
D
E
F
G
H
I
J
A
B
C
D
E
F
G
H
I
J
“Cal”
“Cal,0”
1
1
2 3
3
2
Dissolved Oxygen
TM
0:10 − 1:30
O
2
O
2
N
2
N
2
N
2
N
2
Gas
Void space
Only the gas.
(not the flame)
Trapped air
Dual point calibration (optional)
Do not unscrew
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