Automatic Spread Oil Meter■ Outline and Features
The rolled steel sheets production line has coating processes for anti-rust oil such as DOS, ATBC, CSO,etc., and the amount of coating is controlled.
The SOM-R measures the small amount of oil deposited on rolled steel sheets. The Hydrophil Balance
Method, which utilizes the characteristics of oil film pressure spreading over the water’s surface, is used.

■ Features◆The small amount of oil on the test piece on the micro-gram (µg) order can be measured.

◆The precise Wilhelmy Plate Method is used for detecting surface film pressure,◆The trough is coated with Teflon for corrosion resistance and easy cleaning.

◆Easy cleaning of the detecting glass plate.

◆Calibration of the surface film pressure meter by the operator is possible.

◆The temperature control system is equipped for obtaining stable data.

◆The oil volume by “mg/m2” is directly read on the digital display.

■ Partial List of Users
JapanNippon Steel / JFE Steel / Kobe Steel / Toyo Seikan / Toyo Kohan
Furukawa Electric / UACJ / Altemira / MA Aluminum

Overseas
Baoshan Iron & Steel (China) / Hbis Group Hengshui Strip Processing (China) / Jiangsu Youfu Sheet Technology (China)
China Shipbuilding Industry Equipment & Materials (China) / Ton Yi Industrial (Taiwan & China) / China Steel (Taiwan)
POSCO (Korea) / Shin-Hwa Silup (Korea) / Perstima Tin Plate (Malaysia, Vietnam) / Siam Tinplate (Thailand)
UACJ (Thailand) / Tinplate Company of India / JSW Groupe (India) / PT. Latinusa (Indonesia) / Erdemir (Turkey)
Ternium Siderar (Argentina)

■ Principle

Most oils have the property of spreading as a monolayer film over a sufficiently wide water surface.
If the density of the oil molecules is even, the area of the oil film expanded on the water surface is
proportional to the volume of the oil (the number of oil molecules). In other words, if the density of oil
molecules can be adjusted even when the oil film is spread and the equation relating the oil volume to its
expanded area is obtained in advance by experiment, the oil volume can be determined from the area ofthe oil film expanded.

How can the even density of oil molecules be controlled?
As oil molecules get closer to each other, the intermolecular interactions become stronger, and the pressure
increases. This pressure is called Surface Film Pressure and is the reason why the oil molecules spreadover water on a monolayer (Fig.1). The relationship between the area of expanded oil film and the surface
film pressure for a given amount of oil indicates a curve as in Fig.2. Therefore, the density of oil molecules
is adjustable uniformly by determining the surface film pressure. This SOM-R sets this pressure at 8 mN/m,called Measurement Pressure.

Fig.1

oil molecules

Surface film pressure(mN/m

distance of molecules

Fig.2）

distance of molecules
long (low density) ⇒ low pressure
short (high density) ⇒ high pressure

Area of oil film expandedhigh  density → low

How to measure the Surface Film Pressure?
When the bottom of the detecting glass plate is immersed in the surface of the water, a phenomenon called
meniscus occurs, in which the plate surface wets the water up with a curved surface, as shown in Fig.3.
The oil molecules spread above the water, and the intermolecular interactions work as the pressure, whichacts as an upward force to push the detecting glass plate up.

Fig.3
Detecting glass plate

Force direction
PressureMeniscus

■ Specifications
Control box

Material

It equips the power switch, operates the barrier transfer unit andthe elevator device, and displays data on surface film pressureand oil volume.
■Surface film pressure meter – measurement & display
Measuring method
Wilhelmy Plate method
Measuring range
0-50.0mN/m (Analog meter)
Accuracy±0.5%F.S■Oil volume meter – measurement & display
Measuring range
0.3-17.5mg/m2 (in the case using
DOS oil, test piece ɸ60mm)

Spreadable oil volume
Display method
Display resolution
Accuracy
Settings of oil type
External size, weight

0.7-50.0μg
Digital0.1mg/m2±2%F.S on 35C basis
Possible up to 3 types
430W×305D×150Hmm, 5.5kg

Teflon coated trough
It is filled with water to spread the oil to be measured.
Circulating the temperature-controlled water inside the troughstabilizes the measurements.
Configuration
Trough, Level adjust stands (x4),
Surface film pressure meter
Material of troughBase metal: aluminum
Top surface: Teflon coating
Internal size, weight
700W×140D×5Hmm, 10.2kg
Cylinder section size
90×90Dmm(section of test piece immersion)

Barrier transfer unit
It moves the barrier and compresses the area of oil film spreadover the water. The drain pan is built in.
Configuration
Transfer unit, Drain pan, Actuator,
Level adjust stands (x4)Transfer speed
Compress: 300mm/min (fixed)
Reversion: 600mm/min (fixed)
External size, weight
945W×335D×295Hmm, 21.4kg

External size, weight

Hot water supplier
It controls the tap water temperature to about 35C andprovides it as the subphase water in the trough.
Temperature range
About 35C - 70C
Control accuracy±5.0C (water temperature provided)
Control method
Thermistor
Safety functions
Temp. fuse, Manual return bimetal
Heater capacity
1,100W
Pressure0.08MPa
Bath volume
25L
External dimensions
434W×395D×395Hmm
WeightAbout 38kg (when filling water)

Hot water circulator
It circulates the temperature-controlled water in the jacket
system inside the trough.
Temperature range
Room temp.+5C - 95C
Control accuracy±0.05C
Control method
PID
Safety functionsDiagnosis function
Tube inlet/outlet
10mmHeater capacity
1,100W
Pump flow rate
5L/minBath volume
5.5L
External dimensions
195W×305D×360Hmm
WeightAbout 13.5kg (when filling water)

Power supply
Total power consumption of main instrument, Hot watersupplier & Hot water circulator: 2,600W
Power voltage
Control box: AC100–240V 50/60Hz
Other than the control box: AC100V 50/60Hz*The step-down transformers required* Splash prevention board included.

Elevator device
It sets a test piece coated with oil and dips it into the water inthe trough repeatedly a preset number of times to transfer theoil on the test piece to the water surface.
Configuration
Main body built-in drive motor,Arms, Test piece fixture
Cycle speed setting
3 modes: Hi, Low, Adj (adjustable)
Approximate cycle
Elapsed time for 25 ups & downs:
speed
Hi 40sec., Low 150sec.
Adj 24sec.-∞
External size, weight
330W×145D×380Hmm, 7.2kg*Arms excluded.

Environmental chamber
A case to protect instruments, windshield, and dustproof.
Configuration
Chamber, LED lights (x2), Slidedoors & open/close sensors (×4),

Slide door, side panel: PVC boards,
static-dissipative, transparent
Frames: aluminum alloy
Top & side panels: aluminum
1,600W×700D×700Hmm, 33.5kg

Footprint
2,400(W) ×800(D)mm*When hot water supplier & circulator are laid flat.

Standard accessories
Teflon coated barrier 4 pcs Micro-syringe 250μL
2 pcs
Detecting glass plate 5 pcs Calibration weight 200mg 2 pcs
Area reducing block (Teflon coated)
1 set (2 pcs)
Hoses: Pressure vinyl hose IDɸ10×5m
Silicon hose IDɸ10×10m & IDɸ15×5m

We recommend using purified water to measure as much aspossible. Do not use hard water. (When using tap water, an outletof 15 to 15.5 mm dia. with a constant pressure and a flow rate of
1 L/min. is essential.)
Saltwater cannot be used with the standard model because it
corrodes the trough and the peripheral equipment.

*The specifications and designs are subject to change without notice.

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