12
vwr.com I Instruction manual VWR® U Water System
2 INSTALLATION
2.1 Installation Site Requirements
Item
Requirements
Installation space
≥ 90 cm×50 cm total
Feed water
Municipal water, outlet diameter > DN 20, ball
valve, NPT thread
Drain water tubing
> DN 50
Working Temperature
5
– 45
o
C
Power
100
– 240 VAC ± 10%, 1 KW (5 A)
Humidity
20
– 80%
2.2 Feed Water Requirements
Parameter
Value or Range
Pressure
15
– 90 psi (1.0 - 6.0 bar)
If the pressure is above 6.0 bar, needs to install
an external pressure regulator.
Conductivity at 25 °C
< 200
0 μS/cm
pH
4
– 10
Water temperature
5
– 45
o
C
Total dissolved solids (TDS)
< 1000 ppm
Total Organic Carbon (TOC)
< 2000 ppb
Hardness (as CaCO
3
)
< 120 mg/L (< 120 ppm): use 171-1255
120
– 180 ppm: use 171-1256
> 180 ppm: softener recommended
Free or total chlorine
< 1.5 ppm
2.3 Feed Water Quality Measurements
Parameter
Test Method
Pressure
Use a pressure gauge
Conductivity at 25 °C
Use a conductivity meter
pH
Use a pH test strip
Hardness and chlorine
Use a reputable brand test strip
Total dissolved solids (TDS)
Use a TDS meter
Total Organic Carbon (TOC)
Use a TOC analyzer
