1, the conductivity of water treatment
1μs / cm (micro-Siemens / cm)
= 10-4s / m (Siemens / m)
= 0.1ms / m (cents Siemens / m)
2, water treatment resistivity
Resistivity = 1 / Conductivity
10 MΩ · cm (megohm · cm) = 0.1 μs / cm (micro-Siemens / cm)
3, the concentration of units
(1) mass concentration
1 mg / L (mg / l)
= 1ppm
= 103ppb
= 106ppt
= 10-3 μg / L (μg / l)
(2) molar concentration
1 mol / L (mol / l)
= 1000 mmol / L (mmol / liter)
10 flow rate, flow rate
1 gallon per minute (gpm) = 0.272 m3 / h (m3 / h) = 272 liters / hour (L / h) = 4.53 L / min
The normal flow rate should be controlled at 4-6 m / h
4, hardness
1 grain / gallon (grain / gal) = 17.1 mg / l (mg / L)
1 grain / gallon (grain / gal) = 0.342 mg equivalent / liter (mgN / L)
The gram equivalent of CaCO3 is 50, that is, the mass of 1 g equivalent of CaCO3 is 50 g;
1 mg equivalent / liter = 50 mg / l
(1 thousand lattice = 1.297 gram equivalent)
12 water pressure
1 psi = 0.07 kg / cm2 = 0.006895 MPa (MPa)
5, pressure units
1MPa (MPa)
= 10bar (bar)
= 103KPa (kPa)
= 106Pa (Pa)
= 145 psi (psi)
1 mmHg (1 mmHg) = 13.6 mmH2O (13.6 mm water column) = 133.32 Pa (Pa)
1 mmH2O (mm water column) = 9.8 Pa (Pa)
1 atm (standard atmospheric pressure) = 760 mmHg = 0.101 MPa
Note: Since the pressure of the gas and the liquid is caused by gravity, the pressure is the pressure