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Water Quality Of The Hydraulic Circuits; Antifreeze Mixtures - Mitsubishi Electric t-NEXT DF DX 011 P1 S Manual

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t-NEXT DF DX

WATER QUALITY OF THE HYDRAULIC CIRCUITS

The values shown in the table must be guaranteed during the entire life cycle of the machine.
Description
1
Hydrogen Ions
2
Presence of calcium (Ca) and magnesium (Mg)
3
Chlorine ions
4
5
Manganese Ions
6
Carbon dioxide
7
Hydrogen sulphide
8
9
10
11
Ratio between carbonates and sulphates
12
Sulphate ions
13
Phosphate ions
where: 1/1.78°D = 1°Fr with 1°Fr = 10 gr CaCO
ppm = parts for millions
ppb = part for billion
Explanatory notes:
ref.1:
A greater concentration of hydrogen ions (pH) than 9 implies a high risk of deposits, whereas a lower pH than 7 implies a high risk of
corrosion.
ref.2:
The hardness measures the amount of Ca and Mg carbonate dissolved in the water with a temperature lower than 100°C (temporary
hardness). A high hardness implies a high risk of deposits.
ref.3:
The concentration of chloride ions with higher values than those indicated causes corrosion.
ref. 4 - 5 - 8:
The presence of iron and manganese ions and oxygen leads to corrosion.
ref.6 - 7:
Carbon dioxide and hydrogen sulphide are impurities that promote corrosion.
ref.9:
Usually in water from the waterworks it is a value of between 0.2 and 0.3 ppm. High values cause corrosion.
ref.10:
The presence of ammonia reinforces the oxidising power of oxygen
ref.11:
Below the value shown in the table, there is a risk of corrosion due to the trigger of galvanic currents between copper and other less noble
metals.
ref.12:
The presence of sulphates ions triggers corrosion phenomenon.
ref.13:
The presence of phosphates ions triggers corrosion phenomenon.
It is necessary to carry out periodic checks, with withdrawals at different points of the hydraulic system. During the first year of operation, checks are
recommended every 4 months which can be reduced every 6 months starting from the second year of operation.
WARNING:
It is necessary that, in the presence of dirty and / or aggressive waters, an intermediate heat exchanger is installed upstream of the heat
exchangers

ANTIFREEZE MIXTURES

In plants that are not adequately protected by heating cables, protect the hydraulic circuit with an anti-freeze mixture when the ambient air temperature can
drop below 5°C.
Minimum ambient air temperature
ETHYLENE GLYCOL (suggested % in weight)
Minimum ambient air temperature
PROPYLENE GLYCOL (suggested % in weight)
The values are indicative and may significantly vary depending on the glycol manufacturer. Refer to your glycol supplier for detail.
The values consider a precautionary difference of 5°C between the minimum ambient air temperature and the freezing temperature of the mixture.
In the hydraulic circuit do not send fluids other than water or mixtures with ethylene / propylene glycol.
If other products are provided, in addition to mixtures of water and ethylene or propylene glycol, contact the Manufacturer to check the compatibility with the
machine components.
T_tNEXTDFDX_0719_EN
Iron Ions
Oxygen
Chlorine
Ammonia
/ m
3
3
°C
%
°C
%
Symbol
pH
Hardness
Cl
-
Fe
3+
Mn
2+
CO
2
H
S
2
O
2
Cl
2
NH
3
HCO
-/SO
2-
3
4
SO
--
4
PO
3-
4
5
0
-5
-10
0
12
20
30
5
2
-3
-9
0
10
20
30
20
Range
7.5 ÷ 9
4 ÷ 8.5 °D
< 150 ppm
< 0.5 ppm
< 0.05 ppm
< 10 ppm
< 50 ppb
< 0.1 ppm
< 0.5 ppm
< 0.5 ppm
> 1
< 100 ppm
< 2.0 ppm
-15
-20
-25
-30
35
40
45
50
-13
-17
-23
-29
35
40
45
50
MEHITS S.p.A.
DATA BOOK

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