horiba FluoroMax-3, Руководство по эксплуатации

Страница: 33 / 220

FluoroMax-3 v. 3 (22 Feb 2005) System Description
2-5
To insert or remove a sample platform,
1
If a multiple-sample turret is installed, shut off
the system.
2
Remove the four screws on the front of the
sample platform.
3
Slide out the old platform.
4
Slide in the new platform.
5
If the platform has a rotatable turret or magnetic
stirrer, slide the 15-pin connector gently and se-
curely onto the 15-pin receptacle in the sample
compartment.
6
Re-attach the four screws on the front of the
sample platform.
Detectors (5 and 6)
Each FluoroMax
®
-3 contains two detectors:
•
Signal detector
The signal detector is a photon-
counting detector. This detector is
an R928P photomultiplier tube,
which sends the signal to a photon-
counting module. The detector’s
response ranges from 180–850 nm,
with dark counts < 1000 counts per
second (cps). The linear range for photon counting is 0–2 mil-
lion cps. The working range is up to about 1–2 million cps.
Above 2 million cps, photon-pulse pile-up reduces the signal-
to-noise ratio, and causes the detector to lose its linear re-
sponse.
•
Reference detector
The reference detector monitors the
xenon lamp, in order to correct for
wavelength- and time-dependent
output of the lamp. This detector is a
UV-enhanced silicon photodiode,
which is just before the sample
compartment. It requires no external bias, and has good re-
sponse from 190–980 nm. The output is collected by a cur-
rent-input module, with a range from 0–12 µA.