Table of Contents
Advertisement
6. Analysing Samples
The Photometer 7500 Bluetooth provides simple, accurate
and reliable analysis of key drinking water, wastewater and
process water parameters. Selecting the required parameter
and performing the test are supported through on-screen
prompts and comprehensive test instructions.
The principle of photometric testing is based on the
absorption or scattering of a measured intensity of incident
light compared to the light intensity reaching the detector
array. The light intensity is determined as Transmittance (%T)
or Absorbance (A) and compared to calibration tables stored
within the Photometer 7500 Bluetooth. The stored calibration
tables convert %T or A to results in a variety of units (mg/l,
ppm etc.) as defined in Section 7.
Calibration tables are defined by Palintest based on the
measurement of reference standards using Palintest
reagents. To achieve the best quality results there are a small
number of care points:
1. Always use the provided light cap to prevent ambient
light affecting the results.
2. Ensure Sample and Blank cuvettes are clean, dry and
inserted correctly into the sample chamber, using the
allocated orientation mark to align.
3. Always blank the instrument with untreated sample
prior to analysis
Additional guidance is provided in Appendix 1 Photometric
Testing Hints and Tips
6.1 Selecting Test Parameters
The Photometer 7500 Bluetooth offers a number of choices to
select the parameter to test:
Phot Number Entry – use the numeric keypad to enter the
28
Hide quick links:
Advertisement
Table of Contents
