WFJ 7200 Visible Spectrophotometer Operating Procedure

1. Connect the power cord of the instrument to ensure that the power supply of the instrument has good grounding performance.

2. Turn on the power and let the instrument warm up for 20 minutes. (not including instrument self-test time)

3. Use the <MODE> key to set the test mode: transmittance (T), absorbance (A), known standard sample concentration (C) and known standard sample slope (F).

4. Use the wavelength selection knob to set the analysis wavelength you need.

5. Pour the reference sample solution and the tested solution into the cuvettes respectively, open the cover of the sample chamber, and insert the cuvettes containing the solutions into the cuvette grooves respectively. The paired cuvette will affect the test accuracy of the sample. There should be no fingerprints or traces of the solution on the surface of the light-transmitting part of the cuvette, and there should be no air bubbles or suspended solids in the solution to be tested, otherwise the accuracy of the sample test will be affected.

6. Put the 0%T calibration tool (black body) into the optical path, press the "0%T" key in the T mode, and the display will display "000.0"

7. Push (pull) the reference sample into the optical path, press the "0A/100%T" key to adjust 0A/100%T, at this time the display or "0.000" up to A.

8. When the display of the instrument shows "100.0"%T or "0.000"A, push (pull) the sample to be tested into the optical path, and then you can get the transmittance or absorbance of the sample to be tested from the display.