Note that:
1. no relationship can be proven between water hardness and conductivity; nonetheless, as an indication
only, water with a hardness of 40°f should have a conductivity of approximately 900-1000 μS/cm at 20
°C.
2. if supplied with water coming from an external reverse osmosis system, an instant flow-rate of 20
l/min (5.28 Gal/min) must be guaranteed. For UG450, there are two inlets, therefore the instant flow-
rate must be 2 x 20 l/min (2 x 5.28 Gal/min).
Min Max
Specific conductivity at
20°C
σ20 - μS/cm 0 1500
Total dissolved solids TDS – mg/l (1) (1)
Dry residue at 180°C R180 – mg/l (1) (1)
Hydrogen ion activity pH 6 8.5
Total hardness TH– mg/l CaCO3 0 (2) 400
Temporary hardness mg/l CaCO3 0 (3) 300
Chlorides ppm Cl - 50 (4)
Iron + Manganese mg/l Fe+Mn - 0.2
Silica mg/l SIO2 - 20
Residual chlorine mg/l Cl- - 0.2
Calcium sulphate mg/l CaSO4 - 100
Metallic impurities mg/l 0 0
Solvents, thinners,
detergents, lubricants
mg/l 0 0
Tab.2.b
(1) Values dependent on the specific conductivity; in general: TDS ≈0.93* σR, 20°C; R180 ≈0.65* σR, 20°C;
(2) Not lower than 200% the chloride content in mg/l Cl-;
(3) Not lower than 300% the chloride content in mg/l Cl-;
It may be necessary to adjust the drain rate to avoid a concentration in the boiling water higher than 300
mg/l Cl-;
2.4
Drain water
characteristics
The drain water:
o
contains the same substances that are dissolved in the supply water, yet in greater quantities;
o
can reach a temperature of 100°C (212°F);
o
is not toxic and thus may be drained into the sewage system;
o
for drain tempering versions, water temperature will be 60°C (140°F), with a ma inlet temperature of
25°C (77°F).
Important: completely demineralised water is aggressive. For connection to a feedwater system with
completely demineralised water, only use components made from chemically-resistant plastic (e.g.
polypropylene) or stainless steel.
18|2. Connections
gaSteam - UG +0300090EN rel. 1.2– 09.10.2018
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