Manufacturer of Level Switch, Level Transmitter,
Detector and Sensor DITECH,LTD.
DITECH,LTD.
Model QBS-OFμ
μm-class ultrathin
oil film detector
QBS-OFμ
NSB-OFμ
proof
construction
Non-explosion-proof
Intrinsically safe construction(i3nG5)
measured
Various kinds of floating oil |
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This is the μm-class ultrathin oil film detector to detect floating oil films in facilities such as water channels, closed water channels and wastewater pits. It is suitable for detecting any water-insoluble oil.
Employing DITECH’s proprietary impedance type measurement principle, this oil film detector detects even extremely thin oil films down to several micrometer thicknesses. Accordingly, it is effective in conducting final checks at wastewater pits immediately before release.
Click here for information on Capacitive mm-class oil film detector
principles
The electrode is mounted on a float and set on the water.
In the absence of an oil film, the sensor detects the impedance of the water.
When the sensor contacts an oily film, the oil spreads across the surface of the electrode.
This changes impedance and the electrode sends a detection signal.
If the oily film is taken away by currents, the electrode again detects the impedance of the water.
The signals flicker with wave movement. Therefore, signals are momentarily delayed inside the alarm setter in order to compute an average and obtain a stable signal.
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Unaffected by the color of water or the type of oil.
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High mechanical strength as well as oil, chemical and wear resistance achieved by the standard float sensor made of stainless steel.
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No moving parts ensure a long service life.
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Extremely robust, maintenance-free detector.
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Low initial cost and low maintenance cost.
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Wide thickness measurement range.
(The detector covers an oil film thickness range from 10 μm to 10 mm by varying float and probe heights.)
| Measurement system | Impedance system |
| Measurement range | 10μm～10mm |
| Output signal | DC4～20mA DC1～5V ※One of the above signal |
| Input power | Model QBS-OFμ (Model PS-0Fμ)： AC105V/210V 50/60Hz or DC24V Model NSB-OFμ (Model PS-2)： AC105V/210V 50/60Hz |
| Power consumption | 10W |
| Allowable pressure | Detector： 0℃～+100℃ (Depends on the specifications) Transducer： Model PS-0Fμ： －10℃～＋50℃ Transducer： Model TR-2Fμ： －25℃～＋70℃ Power source： Model PS-2： －10℃～＋50℃ Special cable： Model DSC-05 (small size)： －10℃～＋60℃ |
| Time lag | 0～30 seconds variable |
| Weight | Transducer： Model PS-0Fμ： 5.5kg Transducer： Model TR-2Fμ： 4.3kg Power source： Model PS-2： 7.6kg |
| Size | Transducer： Model PS-0Fμ： 216(W)×125(D)×259(H) Transducer： Model TR-2Fμ： 200(W)×149(D)×220(H) Power source： Model PS-2： 250(W)×145(D)×275(H) (mm) |
| Surface treatment | Float： Buff, etc. |
| Shape | Float： Cylindrical type Raft type, etc. |
| Material | Float sensor： SUS304 SUS316 Titanium PTFE, etc. Head case ： Light alloy Silver, etc. |
Model QBS-OFμ
(Non-explosion-proof type)
＜Separated transducer type＞
This model is composed of float type detector unit, transducer and special cable.
Model NSB-OFμ
(Intrinsically safe construction / i3nG5)
＜Totally separated detector unit type＞
This model is composed of float type detector unit, transducer, relay power source and special cable that is 4 core control cable. As the transducer is designed to be installed in a dangerous area, the special cable can be made short enough to minimize picked-up noises, thus permitting a stable performance to be obtainable. As to performance, this model has the same characteristics as those of Model QBS-OFμ.
