7 Maintenance
K-375 / K-376 / K-377
Operation Manual, Version E
137
7 5 2
Decalcification of the steam generator
To decalcify the steam generator proceed as follows:
∙ Make sure that the steam generator is cooled down (switch off the unit and let it cool down for
at least 30 minutes)
∙ Remove the water of the steam generator (see 9.1 Emptying the steam generator)
∙ Mix about 0.8 L of solution for decalcification (use approx. 160 g citric acid or 80 g amidosulfuric
acid dissolved in 0.8 L water)
∙ Remove the hose from the H
2
O pump on the back of the device and connect another hose with
the pump
∙ Dip this hose into the decalcification solution
∙ Switch on the K-375
∙ After initialization the pump starts running
∙ Switch off the unit after the steam generator is filled with the solution (pump stops running)
∙ Let the solution dissolve the lime for 0.5 – 1 hour
∙ Remove the solution of the steam generator (see step 1 and 2)
∙ Perform a second decalcification (see step 5 – 10)
∙ Connect the hose from the water tank with the pump for H
2
O
∙ Flush the steam generator 2 – 3 times with distilled water (see step 6 – 8 and 10)
∙ Perform 2 – 3 times a CLEANING (cleaning procedure) of the instrument
7 5 3
Replacement of the sodium hydroxide pump
The pump for sodium hydroxide is considered as an expendable part which needs to be replaced
once per year as a proactive measure.
Proceed as follows:
!
WARNING
Serious chemical burns by corrosives.
∙ Observe all data sheets of the used chemicals.
∙ Handle corrosives in well ventilated environments only.
∙ Always wear protective goggles.
∙ Always wear protective gloves.
∙ Always wear protective clothes.
∙ Do not use damaged glassware.
!
WARNING
Death or serious injuries by contact with high voltage.
∙ Make sure device is switched off and unplugged before replacing the pump.
