robatherm RM Series - Spray Humidifier

Commissioning and Maintenance
58 © robatherm
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Spray Humidifier
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Quality of Fresh and Recirculating Water
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Before commissioning the quality of fresh and recirculating water must be checked.
Fresh Water
 Analysis of fresh water (usually available from local water authority).
 Total water hardness under 7° dH.
 Water quality following VDI 6022, VDI 3803
,
DIN EN 13053 and Drinking Water
Ordinance
Recirculating Water
Limits for quality of recirculating water (recommendation partly based on VDI 3803 and
German Printing Trades Association):
Quality Normal
Requirement
Data Processing
Areas
Sterile and Clean
Rooms
Elec. conductivity
(µS/cm)
< 1,000* < 300 < 120**
Carbonate hardness
(° dH)
< 4 < 4 < 4
Chloride (g/m³) < 180 < 180 < 180
Sulphate (g/m³) < 150 < 100 < 100
pH-value 7 to 8.5 7 to 8.5 7 to 8.5
Germ count (KBE/ml) < 1,000 < 100 < 10
Legionella (KBE/100ml) < 100 < 100 < 100
Thickening Count 2 to 4 2 to 6*** 2 to 8***
CBU = Colony Building Units
*) Descaling and part desalination may be necessary; for moistening above 95% r.h.
electrical conductivity max 800 µS/cm.
**) Full desalination necessary
***) Lower value without extra measures for sterilisation; upper value with extra
measures
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Thickening Count
Establishment of thickening count from the values of the fresh water analysis and the
recommended value limits for the quality of recirculating water (see table):
Thickening count – recommended value for recirculating water / value for fresh water.
Whereby the thickening count must be calculated for the electrical conductivity, hardness,
chloride content and sulphate content. The lowest value of the calculated thickening counts
should be close to the recommended value limits (see table). For values below 2, additional
measures for water treatment should be taken. Contact a company specialising in water
processing.