Tokyo Boeki Labmax 240, Service Manual

Page: 87 / 178

Service Manual
Chapter 3
3‑41
3.10. Spectrophotometer (SPM)
3.10.1. Parts and Configuration
- Refer to “ASSY-12 SPM” for the unit assembly drawing.
- Refer to “WIRING-14 SPM” for the unit wiring diagram.
- Refer to “Operation manual 5.2.7 Light Source” for the lamp exchange.
3.10.2 Function and Action
1. Function
Rear spectrophotometry is adopted.
White light from light source lamp is converged by lens, etc. and is led to go through
reaction cuvette, a cell for measurement, and is diverged by concave diffraction
grating.
After the diffraction, light energy is measured by 12 individual photo-detectors in
each designed wavelength. Monochromatic measurement takes the output of one
detector out of twelve, and bi-chromatic measurement takes two.
And the absorbance or the absorbance difference is calculated by the information
amplified by an amplifier and then average deviation and logarithmic transformed
signals.
Fig. 3-62 Reaction Tray periphery Fig. 3-63 Spectrophotometer
Lamp House
Lamp House
Lamp