SYSTEMP – Installation Operation Manual (IOM SYSTEMP rev.N)

47
8.5.2 SETTING UP THE SUBMERGED ELECTRODE HUMIDIFIER WATER CIRCUITS
The submerged electrode humidier's supply line shall have the features set out in the table below:
A Shut-o cock
B Mechanical lter
Humidier water supply line
To ensure that circuit pipes are installed correctly, we recommend you follow the instructions below:
• A shut-o cock must be installed on the water supply pipe (A).
• A 50 μ mechanical lter must be installed on the supply line (B).
• The water pressure must range between 1-8 bar (100 and 800 kPa).
• The water temperature must range between 1 and 40 °C.
• The instantaneous water ow rate must not be lower than the nominal ow rate of the supply solenoid valve (0.6 - 1.2 l/min)
• Do not treat with softeners or demineralisation plants.
Once installation is complete, bleed the supply pipe for approximately 30 minutes, channelling the water directly to the
drain pipe without letting it enter the humidier. This will eliminate any waste or processing substances that could block the lling
valve and/or create foam during boiling.
8.5.3 CHEMICAL/PHYSICAL CHARACTERISTICS OF THE WATER SUPPLY
The correct functioning of the humidier mainly derives from the chemical/physical characteristics of the supply water.
There is no reliable relationship between water hardness and conductivity and between conductivity and cylinder production!
The cylinder supplied as standard with the units is suitable for water with a specic conductivity at 20 °C between 350 and
750 µS/cm (MEDIUM conductivity). If the characteristics of the humidier feed water do not comply with this type of water, it is
possible to consider replacing the standard cylinder with special cylinders suitable for the following conditions:
1) Cylinders for LOW conductivity: Suitable for water with a specic conductivity at 20 °C between 75 and 350 μS/cm.
2) Cylinders for HIGH conductivity: Suitable for water with a specic conductivity at 20 °C between 750 and 1250 μS/cm.
The following table shows the limit values for correct operation of the various types of cylinders available:
Limit values for feed water of immersed electrode humidiers
Values
Waters with low salt content Normal waters
Minimum Maximum Minimum Maximum
Hydrogen ion activity pH 7 8,5 7 8,5
Specic conductivity at 20 °C σ
R 20 °C
- µS/cm 75 350 350 1250
Total dissolved solids TDS - mg/l 70 325 325 1160
Fixed residue at 180 °C R
180
- mg/l 50 230 230 815
Total hardness mg/l CaCO
3
50* 160 100* 400
Temporary hardness mg/l CaCO
3
30** 100 60** 300
Iron + Manganese mg/l Fe + Mn 0 0,2 0 0,2
Chlorides ppm Cl 0 20 0 30
Silica mg/l SiO
2
0 20 0 20
Residual chloride mg/l Cl
2
0 0,2 0 0,2
Calcium Sulphate mg/l CaSO4 0 60 0 100
Metallic impurities, solvents, thinners, soaps, lubricants mg/l 0 0 0 0
* Not less than 200% of the chloride content in mg/l Cl - ** Not less than 300% of the chloride content in mg/l Cl
Do not treat with softeners or demineralisation plants!
Should the features of the humidier’s supply water not comply with the features of the special cylinders, alternative systems will need to
be assessed that cannot be integrated inside the unit, such as resistor or ultrasound humidiers
A
B