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We would like to report successful management of hydraulic oil using electrostatic oil cleaner, enabling to save electric consumption of machines.
When an electrostatic oil cleaner is used to clean oil, power consumption is significantly reduced resulting in cost cuts - even taking into account the electric cost for running the electrostatic oil cleaner.

Measurement method	Attaching a power meter and a printer to the 850 ton molding machine of Company T, we measured its average power usage every 30 minutes one week before oil cleaning was performed. We did the same 9 days after oil cleaning was performed.
Conditions of the molding machine	Oil quantity: 2900L (liter) Oil name: Super Highland 46 Oil temperature: 42℃ Filter used: Strainer and bypass filter (line and return filters not used) Motor: 3 units.
Service period of oil	7 years and 9 months (with some replenishing only)
Oil cleaner deployed	EOC-100
Grade of oil contamination	before cleaning: 0.7mg/100ml, off the NAS grade; after cleaning: 0.5mg/100ml NAS Class 7
Measurement results	- Before cleaning After cleaning Power saving Power saving Average power (kw) 18.0 16.5 1.5 8.3%
Electricity cost saving	Operating times 24hrs x 20days/mo x12mo/yr Unit cost of electricity: 10.2 JPY/KWH Actual electricity saving is obtained by subtracting power consumption of electrostatic cleaner. Power consumption of installed electrostatic cleaner, EOC-R25: 0.2kw Annual power saving (for 3 motors serviced by one unit) =(1.5(kw) x 3-0.2(kw)) x 24(hrs/day) x 20(days/mo) x 12(mos/yr) x 10.2(JPY/kw)=252,633JPY/unit Since there are 27 molding machines in operation at the plant, total power saving per plant is 27 unit x 252,633JPY=6,821,091JPY

Table below shows the changes in oil conditions for 7 years when the electrostatic oil cleaner is used. As apparent in this table, the cleanliness, the NAS class, and water concentrations are all controlled to normal conditions, requiring no need of oil replacement for 7 years in order to make malfunction-free operation of machines.

• Changes of oil conditions for 7 years after installing the electrostatic dust cleaner.

Machines used	Hydraulic simulator (equipped with 6 servo valves)
Oil quantity	6000L
Oil name	Mulpus 32
electrostatic dust cleaner	EOC-50

Years of service of oil :	1st year	2nd year	3rd year	4th year	5th year	6th year	7th year
Cleanliness (mg/100ml) :	0.3	0.2	0.3	0.3	0.4	0.4	0.3
NAS Class :	4	5	6	6	5	4	6
Water contentippm) :	80	30	80	50	80	40	50

Years of service of oil :	1st year	2nd year	3rd year	4th year	5th year	6th year	7th year
Cleanliness (mg/100ml) :	0.3	0.3	0.3	0.3	0.4	0.4	0.2
NAS Class :	5	4	6	6	4	5	7
Water contentippm) :	90	30	80	50	80	20	30

Years of service of oil :	1st year	2nd year	3rd year	4th year	5th year	6th year	7th year
Cleanliness (mg/100ml) :	0.3	0.3	0.2	0.2	0.4	0.2	0.2
NAS Class :	5	5	6	6	3	5	7
Water contentippm :	80	30	80	50	70	30	40

• Cleanliness: maintained for 7 years at 0.2mg/100ml - 0.4mg/100ml of cleanliness level.
• NAS Class: controlled to NAS Class 3-7.
• Water content::controlled to 20ppm-90ppm
• Oil replacement: None for 7 years (vs. once a year replacement before installing the electrostatic cleaner)
• Hydraulic malfunctions: none for 7 years including servo valves
• Collector exchanges cycle: every 2000 - 3000 hours