Xylem Oxix Dissolved Oxygen Transmitter - Manual (Page 21)

21
Dissolved Oxygen Transmitter
GB Oxix Manual 080915
FW: 841013-009, 846001-002, 841513-009
5. Sensor Calibration
The Oxix ® sensor is factory calibrated. No further calibration is required.
Zero-point Calibration Check
A zero-point calibration check may be carried out as described below.
Required materials
1 bucket •
1 measuring cup •
1 tablespoon •
Sodium sulfite (Na •
2
SO
3
)
Procedure
1. Dissolve 3 tablespoons of sodium sulfite ( Na
2
SO
3
) in a bucket (or open
container) containing 4 liters of clean tap water (1 US gallon, 0.9 UK
gallon).
2. Stir for about 1 minute.
3. Lower the sensor into the solution and let it rest at least half an hour.
4. Make sure that the sensor's measuring element is facing down, and no air
bubbles stick to the lense.
5. Check that the the Oxix ® readout is zero.
2-point Calibration
2-point calibration is normally not required and is not recommended.
For very special applications it is possible to perform a 2-point calibration of
the Oxix
® transmitter. If required, contact an MJK sales or service representa-
tive for further details.