User Manual D2 PHASER
DOC-M88-EXX141 V5 – 01.2015 20
Maintenance of the diffractometer
Introduction
Normally some simple maintenance work should be done frequently by the user. Please take a look to
the maintenance parts and consumables list in order to find maintenance parts.
Maintenance of the internal cooling unit
Cooling cycle
Checks of the liquid coolant level and quality are necessary in time intervals of approx. 1 week. Loss
of liquid coolant may be approx. 1cm
3
to 5cm
3
per month, which depends strongly on environmental
and operational conditions.
The heat from the anode (left arrow in fig. 69) is transported to the lower inlet of the heat exchanger.
Fig. 71 shows the fans which transport cool air from environment through the heat exchanger (fig. 72).
There must be enough space near the inlet and outlet of the heat exchanger for proper cooling.
The cooler fluid from the upper outlet of the heat exchanger flows to the reservoir (expansion tank) of
the pump unit (right arrow in fig. 73). Then the fluid is pumped back to the tube (pump outlet is
indicated by the left arrow in fig. 73). Fig. 69 and Fig. 74 shows the flow direction of the cooling fluid
through the tube. Information on the cooling system may be found in the ‘tools’ section of
‘DIFFRAC.Measurement Suite’ Select ‘generator’ in the left frame; in the main frame the actual
temperature will be displayed in the upper left corner and upper right corner, respectively.
Thermomodule
The thermomodule (fig. 143) replaces the flow sensor since introduction of the “D2 PHASER 2
nd
Generation”. It ist mounted on the tube head (fig. 142) to protect the system from overheating.
1) When the cooling system fails (broken pump, leakage in cooling system etc.) the fluid
temperature increases until the NTC-sensor detects more than 68°C and switches off the HV
generator with cooling alarm in order to protect the x-ray tube.
2) If the NTC-sensor has a short-circuit fault (R = 0 which means that T > 68°C) or a connection
wire is interrupted (R = ∞ which means that T < 7.5°C) then the internal logic inhibits the
switch on of the HV generator.
3) If there is a system error and the NTC-electronics detects a fluid temperature of 7.5°C < T <
68°C (apparent status is OK) although the real temperature increases over 68°C (real status is
a NTC failure malfunction), then the thermofuse will generate a hardware switch off of the HV
generator at 86°C (±5°C).
Checking the cooling fluid level
Before you work with the special cooling fluid, please read ‘innovatek Protect IP – Application mixture’
from the paper ‘Application methods’. This is important safety information which you have to observe.
This fluid is not only a heat transfer medium which transports the heat from the X-ray tube anode to
the environment but also a corrosion protection which prevents corrosion in the aluminum (heat
exchange) and copper (X-ray tube anode) system.
For the evaluation of the fluid’s quality, the pH value has to be checked. Figs. 75 - 77 show an
example of an indicator but any other indicator paper with appropriate resolution may be used. Values
under pH 8 indicate a consumption of the inhibitors. The example, fig. 84 shows a result which is ok. If
pH is less then 8, the complete exchange of the coolant is necessary.
The level of the cooling fluid inside the internal reservoir can be checked visually on the back side of
the system (fig. 78). Please check the level once a week. Avoid levels below the min. mark (fig. 78),
level (a) in fig. 78 is ok. Please check also whether the fluid is clear and free from impurities. In case of
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