Photometer 7500

Photometers should be regularly cleaned to ensure that your instrument is reading correctly and is not affected by dust or water marks.

To clean a compact photometer, place a small amount of anti- static cleaning foam on to a lint free cloth and wipe the instrument.

For multiparameter photometers, you should clean several parts of your instrument. To clean, place a small amount of anti- static cleaning foam on to a lint free cloth and wipe the instrument.

1. Sample holder.
   The first image shows the surface around the sample holder, all visible marks on this area should be removed
2. Outside optics base plate.
   Turn the instrument over and undo the two screws on the base of the instrument, as demonstrated in the second image. Gently wipe the curved areas near the LEDs and the flat area on the opposite side.
3. Inside optics base plate
   Contamination on the inside of the base plate can migrate onto your calibration tubes leading to scratches which damage the standards. If marks cannot be removed from the base plate, a new base plate should be fitted.
   When refitting or replacing a base plate, you must ensure screws are tightened so that the standards are set are the correct height. Failure to do so can lead to compromised results.
   

Check standards allow you to confirm that your instrument is reading results correctly.

The recalibration process is a highly technical process which is carefully controlled. To recalibrate your instrument, it must be returned to Palintest. Contact your Palintest representative for more information.

If your readings indicate that the instrument is ‘out of calibration’ you will need to contact Palintest or your local Palintest Distributor to arrange for servicing and recalibration of your instrument.

However, there are a few things you can try first.  We would recommend that you carefully clean the photometer, especially the cell holder and optical windows (NB: use a soft cloth and water-based antistatic foam cleaner).  Then try re-reading the standards.

Please also carefully check the following:

• That the date on the standards’ certificate hasn’t expired.
• That your instrument is listed on the certificate.
• That the serial numbers on the standards match those on the certificate
• That the standards are in good condition (no scratching or staining).

If these are not correct we would recommend first obtaining a new set of check standards for your instrument.

Important: If returning an instrument to our service department please let us know that the instrument is incorrectly reading the check standards with details of the part and serial numbers of the standards and which of them is failing to read correctly.