Kipp&Zonen CFR Calibration Facility - Manual (Page 11)

CFR manual
10
2.3 Maintenance
In general, the manual calibration facility requires little maintenance apart from keeping it clean and
checking that mountings, fittings and electrical connections are secure.
2.3.1 Lamp
Regular cleaning of both sides of the lamp window is necessary to maintain even illumination.
Open the cover of the lamp by releasing the latches. Remove
the old bulb using a piece of soft cloth and dispose of it
according to local regulations. Take a new bulb from its
package and be sure to only hold it by the base. Handling the
quartz envelope may leave permanent marks on the surface,
so always use a soft, clean cloth. Fit the 2-pin base of the new
bulb into the holder in the middle of the lamp reflector. It only
locates in one orientation and should snap into the lamp
holder when using a minimum amount of force. Close and
secure the lamp cover before switching on the power.
figure 7 230 VAC/ 50 Hz calibration facility
2.3.2 Maintenance and recalibration of the reference pyranometer
On a regular basis the pyranometer dome should be cleaned using alcohol, or clean water. The reference
should be kept in a clean, dry and dark place at stable temperature when not in use. The desiccant should
be checked regularly and changed when necessary. It can be recalibrated at the World Radiation Centre
(Davos, Switzerland), at a Regional Radiation Centre, or at Kipp & Zonen. Addresses of Radiation Centres
can be found in Annex III to this manual. The reference pyranometer should be of similar type
(construction) to the test pyranometer and of equivalent or higher standard.
It can be convenient to have two of each reference type, so that indoor calibrations can continue whilst the
other reference is at a Radiation Centre for recalibration. When the recalibrated reference becomes
operational it is advised to document the change of your radiation scale by checking the old reference
against the new reference. If the scale change is < 1% you can accept the new value as being the most
Warning: When cleaning the window or changing the bulb of the calibration
lamp for maintenance purposes, the calibration facility should be
disconnected from the mains power.
The bulb is pressurized and very hot during operation. Allow it to cool down
before handling.