Commissioning
OUSAF46
16
Hauser
7
Commissioning
7.1
Function check
Prior to initial commissioning, ensure that:
• The sensor is correctly installed
• The electrical connection is correct.
7.2
Calibrating/adjusting the sensor
Measuring points consisting of a photometer sensor, flow assembly (if provided) and a
transmitter are adjusted at the factory. Normally adjustment is not required when
commissioning for the first time.
If an adjustment is desired nevertheless, you have the following adjustment options:
• Adjustment with calibration standards
• Use of Easycal
7.2.1
Calibration/adjustment with standard solutions
Use solutions with a known absorbance (at the sensor wavelength) for the calibration/
adjustment.
L
WARNING
Potassium dichromate is toxic, flammable, carcinogenic and has mutagenic effects!
Can cause cancer, genetic defectives, affect fertility, harm the unborn child and intensify fires.
Potentially life-threatening if inhaled, toxic if swallowed, harmful if it comes into contact with
skin. Causes severe skin burns and severe eye damage!
‣
When working with potassium dichromate, always wear protective gloves and protective
goggles.
‣
Seek special advice before use.
‣
Follow all of the instructions on the manufacturer's safety data sheet.
Use calibration solutions that are suitable for the measuring task. Examples of solutions which
are commonly used include:
Potassium dichromate, K
2
Cr
2
O
7
A solution of 182 ml 0.1N K
2
Cr
2
O
7
, diluted to one liter, has an absorbance of approx. 10 OD at
280 nm. By diluting the solution, you can produce a series of calibration solutions which you
can use to adjust the measuring point.
AU = OD*OPL[cm]
AU ... absorbance units, OD ... optical density, OPL .... optical path length
Instead of potassium dichromate you can also use your process medium for calibrating/
adjusting and for application calibration. Here, also produce a series of dilutions of
known concentration and determine the absorbance in the laboratory.
Summary of Contents for OUSAF46
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