Replacement of the pump-head of the Lytron chiller

The laser has done 8575 hours. This is the first replacement.

• Unscrew right temperature (?) sensor, and pull it out.
• Remove front pressure (?) sensor (it's just a plug).
• Disconnect left tube
• Disconnect right tube (the connection on the plastic L-connector could not be loosened, to disconnected it after the little filter (?).
• Disconnect the pump-head from the motor.
• Unscrew the 2 plastic connectors from the pump-head.
• We reused the 2 plastic connectors. Reapplied 1 or 2 windings of teflon tape.
• Reassemble. This time we also used the 'break'-connector. *It was broken for a year, and the pump head was since used without it.

[ The plastic ring between the pump-head and the motor is needed if this 'break'-connector is used ]

We did not check the pressure generated by the old pump-head.
The original specifications sheets of the legend indicated the pressure was 86 PSI.
Pressing the button with the arrow on the Lytron chiller shows the pressure in PSI.
Turning the relieve valve on the pump head clockwise (2, 3 rotations maybe, goes inwards) we increased the pressure from 55 to 85 PSI. The pressure sort of displays anything between 80 and 89 though, between each reading (per second).

Spare parts :

Situation before :

Situation after [Note the extra spacer ring between the pump head and the motor] :

Water absorption in the atmosphere

This is actually a modelled spectrum, of the entire atmosphere (but most of it is water).
From : http://speclab.cr.usgs.gov/PAPERS.refl-mrs/refl4.html

760 nm is O2
2000 nm is CO2
2060 nm is CO2
The rest is water

Another nice reference : http://irina.eas.gatech.edu/EAS8803_Fall2009/Lec6.pdf

Calibrate Perkin Elmer UV/VIS Lambda 900
Wavelength calibration

run program c:\uvwinlab\service9.exe

The spectrometer needs to be switched on for at least an hour (indicated in the program).
Also make sure the white light is visible on moving the wavelength to 0 nm. Otherwise make a scan from 2000 → 400 nm. This usually solves it.

It calibrates :

• Slit
• UV/VIS 2 peaks (using the 656.1 nm from the internal deuterium lamp, and it's zero order)
• NIR 2 peaks (using the 2nd order of the 656.1 nm)
• 0% Transmission

This takes about 10-15 minutes, after which “Calibrated successfully” is displayed.