2009 by ELTRA GmbH Germany – July 2009 – Service Manual Thermostep
Page 29
At b.) If one analyzed sample has a different chemical consistence than the others (e.g. higher
moisture amount) a prolonged stage time is possible. The software completes a stage when
all
samples show the chosen criteria for this stage.
At this case check if the chosen criteria for the stage (see Operation Manual: Form –
Application
) can be adapted (e.g. other temperature for the stage, wider deviation borders or
smaller time span for the stage).
At c.) A wrong adjusted glass chimney changes the atmospheric conditions at the furnace and
can be causative for a prolonged stage time. Often this problem is accompanied by increasing
and decreasing weights during the stage. (The graph undulates at this case!) Adjust the glass
chimney correctly at this case (see
1.6
).
At d.) A wrong chosen or shown furnace temperature can cause a prolonged stage also. Check
if the shown temperature agrees to the existing temperature at the furnace by an external
temperature determination (see
3.1
).
At e.) The selected application should be adapted at the temperature steps and at the terminal
parameters (conditions to terminate a stage) to the analyzed samples. The preinstalled
applications of the manufacturer are adapted to the established sample materials for this type
of instrument. At the analysis form different materials it can be necessary to determine the
optimal temperature steps and deviation borders experimentally and to adapt the application
to the respecitve requirements. If required contact the manufacturer for support!
An additional reason can be a wrong chosen application. At this case select the correct
application and start a new analysis.
2.8
No Gaspressure, no Oxygen, no Nitrogen
Error message:
“No compressed air!”
“No Nitrogen! Please click button [Skip] to continue...”
(Message for Oxygen same!)
The reasons for the message can be:
a.)
insufficient pressure of compressed air or empty gas reservoir
b.)
interchanged or detached feeding gas pipes
c.)
a defective gas pressure switch
At a.) Check if gas pressure of compressed air is sufficient (at least 4 bar) respectivly if there
is a sufficient gas reservoir (see Fig. 2.2)!
At b.) Check if the feeding gas pipes are inserted properly at the corresponding tube-
connectors at the backside of the instrument (see Fig. 2.1). The tube-connectors possesses a
coloured ring at their vent. You can remove the tube out off the connector by pressing this
coloured ring and pulling out the tube simultanously. Remove the corresponding tube
completely out off the connetcor and insert it at the right position.
At c.) In rare cases the gas pressure switch can be defective and needs to be replaced (see
2.2e
).
2.9
No communication between PC, Analyser and/or Balance
