1.
Place the sensor in a solution of 5% sodium sulfite (Na
2
SO
3
) in water. Ensure that air
bubbles are not trapped against the membrane.
2.
Go to the main display; press
DIAG
and then
NEXT
.
The SENSOR CUR prompt appears.
3.
Press
ENTER
to view the sensor current. Make sure the sensor reaches its zero
current.
This may require several hours. Do not start the zero routine until the sensor has
been in zero solution for at least two hours.
4.
Press
CAL
on the IRC.
The SENSOR 0 prompt appears.
5.
Press
ENTER
.
The screen shows the appropriate value correlating to the zero value. The screen
shows 0.02. The reading must be below 0.02 ppm for the zero calibration to be
accepted.
6.
To change the zero limit, use the editing keys and then press
ENTER
.
The TIME DELAY message appears and remains until the zero current is below the
concentration limit. If the current is already below the limit, TIME DELAY will not
appear.
7.
To bypass the time delay, press
ENTER
.
When the procedure is complete, 0 DONE appears.
8.
Press
EXIT
.
9.
Press
RESET
to return to the main display.
7.4.3
Air calibration procedure (dissolved oxygen)
1.
Remove the sensor from the process liquid. Use a soft tissue and a wash bottle to
clean the membrane. Dry it by blotting.
The membrane must be completely dry during air calibration.
2.
Pour some water into a beaker and suspend the sensor with the membrane
approximately 1/2 in. (approximately 1 cm) above the water surface.
Keep the sensor out of direct sunlight.
3.
Monitor the dissolved oxygen and temperature reading. Once the readings are
relatively stable, begin the calibration.
It may take 10 - 15 minutes for the sensor reading in the air to stabilize.
4.
Press
CAL
on the IRC.
5.
Press
NEXT
.
Measurements
Instruction Manual
49
Summary of Contents for Rosemount5081
Page 4: ......
Page 10: ...Contents vi Rosemount 5081 ...
Page 12: ...Startup procedure 2 Rosemount 5081 ...
Page 23: ...Mounting 5081 on a pipe Figure 3 2 Installation Instruction Manual 13 ...
Page 24: ...Installation 14 Rosemount 5081 ...
Page 28: ...Wiring 18 Rosemount 5081 ...
Page 50: ...Programming basics 40 Rosemount 5081 ...
Page 130: ...Diagnostics and troubleshooting 120 Rosemount 5081 ...
Page 136: ...Digital communications 126 Rosemount 5081 ...
Page 140: ...Engineering drawings 130 Rosemount 5081 ...
Page 141: ...Engineering drawings Instruction Manual 131 ...
Page 142: ...Engineering drawings 132 Rosemount 5081 ...
Page 143: ...Engineering drawings Instruction Manual 133 ...
Page 144: ...Engineering drawings 134 Rosemount 5081 ...
Page 145: ...Engineering drawings Instruction Manual 135 ...
Page 146: ...Engineering drawings 136 Rosemount 5081 ...
Page 151: ...EU Declarations of Conformity 138 Rosemount 5081 ...