palintest Photometer 7500 Operation Manual

Also see for Photometer 7100: Manual

palintest Photometer 7500 Operation Manual Manual pdf 29 page image

286. Analysing SamplesThe Photometer 7500 Bluetooth provides simple, accurateand reliable analysis of key drinking water, wastewater andprocess water parameters. Selecting the required parameterand performing the test are supported through on-screenprompts and comprehensive test instructions.The principle of photometric testing is based on theabsorption or scattering of a measured intensity of incidentlight compared to the light intensity reaching the detectorarray. The light intensity is determined as Transmittance (%T)or Absorbance (A) and compared to calibration tables storedwithin the Photometer 7500 Bluetooth. The stored calibrationtables 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 themeasurement of reference standards using Palintestreagents. To achieve the best quality results there are a smallnumber of care points:1. Always use the provided light cap to prevent ambientlight affecting the results.2. Ensure Sample and Blank cuvettes are clean, dry andinserted correctly into the sample chamber, using theallocated orientation mark to align.3. Always blank the instrument with untreated sampleprior to analysisAdditional guidance is provided in Appendix 1 PhotometricTesting Hints and Tips6.1 Selecting Test ParametersThe Photometer 7500 Bluetooth offers a number of choices toselect the parameter to test:Phot Number Entry – use the numeric keypad to enter the