Manufacturer of Level Switch, Level Transmitter,
Detector and Sensor DITECH,LTD.
DITECH,LTD.
Model QBS
Compact type
Immersion type
L type
L type
Capacitive Level transmitter
QBS
NSB
proof
construction
Non-explosion-proof
Intrinsically safe construction(i3nG5)
Capacitive level transmitters are available with a series of models such as Straight-rod probe type, Flat probe type, Wire type and etc. which are mainly suitable for measuring the insulating material.
Loss of electrical capacitance during measurement is an intrinsic problem that plagues conventional capacitive level transmitters. To overcome it, DITECH's Non-induction Electrostatic Capacitance Series employs innovative technology to prevent capacity losses during the measurement process both within the meter circuitry and along the non-induction extension cable to the detector. Thanks to this technology, these devices offer unprecedented accuracy and stability.
The Non-Induction Electrostatic Capacitance Series also combines a totally new measurement concept with advanced electronic technology, and it is capable of extremely delicate measurements and inductive viscous material measurements.
Moreover, the line-up include these transmitters performing well as a water level meter, a liquid level meter or a interface meter.
Click here for information on Capacitive water・fluid level transmitter
Click here for information on Capacitive interface level transmitter
principles
Every material has intrinsic electrical characteristics such as permittivity and conductivity. This transmitter detects electrostatic capacitance changes generated by the rise or fall of the level of the measured substance in the tank, and then converts these changes into an integrated signal. A variety of meters and detectors are available according to the measurement condition.
With conventional electrostatic type level transmitter, capacitance loss and capacitance distribution loss are intrinsic problems. Our models eliminates both of these problems by means of a non-induction structure. The meter internal wiring, the detector and the extension cable are constructed with an inherent capacitance of zero, so there is no need to compensate for capacitance loss or distribution loss. Moreover, because it contains no unstable elements, this device exhibits no significant changes with time or variation in temperature coefficient, thereby ensuring consistently high measurement accuracy.
Operation is simple, requiring only ZERO and SPAN adjustment. And the models also feature a built-in distribution capacitance and conductance compensation circuit to allow use with a diversity of both new and already installed detectors of various compositions.
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Non-induction system designed to be totally unaffected by capacitance losses.
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Suitable for a wide range of substances from powders with very low dielectric constants to highly viscous conductive materials.
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Totally electronic system with no moving parts ensures a long working life.
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Wide operating temperature range allows use in diverse environments including under both super-high pressure and vacuum conditions. (Depends on the specifications)
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Wide measurement range - Min. 0 mm to Max. 100 m.
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An increased degree of design freedom make it possible to adjust the electrode shape to match the measurement location conditions.
(Straight-rod probe type, Flat probe type, Wire type and etc.) -
Solid body construction designed for long-term durability and easy maintenance.
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Detector and transducer can be separately installed without effecting the device's operating performance.
- Static arrestor (option) maintains safety even in the event of a strong electrostatic charge occurring.
- Lightning arrestor (option) protects the device from lightning-induced surges.
| Measurement range | Min. range 0～5mm , Max. range 0～150m (Any other range are possible) |
| Output signal | DC4～20mA DC1～5V ※ One of the above signal |
| Input power | Model QBS(Model PS-0)： AC105V/210V 50/60Hz or DC24V Model NSB(Model PS-2)： AC105V/210V 50/60Hz |
| Power consumption | 10W |
| Linearity | ±0.5% FS |
| Allowable electrode conductance(G) |
3μS |
| Allowable electrode distribution capacity(Co) |
0～180pF or 0～500pF |
| Allowable temperature | Detector： －200℃～＋1100℃ (Depends on the specifications) Transducer： Model PS-0： －10℃～＋50℃ Transducer： Model TR-2： －25℃～＋70℃ Power source： Model PS-2： －10℃～＋50℃ Special cable： Model DSC-15 (high accuracy use)： －10℃～＋60℃ Special cable： Model DSC-05 (small size)： －10℃～＋60℃ Special cable： Model DSC-13 (heat resistance use)： －50℃～＋200℃ |
| Allowable load | Detector： 2000㎏ Concentrated at detection tip (Depends on the specifications) |
| Allowable pressure | Detector： 100MPa (approx. 1020kg/cm2G) (Depends on the specifications) |
| Weight | Transducer： Model PS-0： 5.5kg Transducer： Model TR-2： 4.3kg Power source： Model PS-2： 7.6kg |
| Size | Transducer： Model PS-0： 216(W)×125(D)×259(H) Transducer： Model TR-2： 200(W)×149(D)×220(H) Power source： Model PS-2： 250(W)×145(D)×275(H) (mm) |
| Installation | Detector： Flange mounting Screws mounting IDF Grayloc connector Ferrule Ring joint Lens Aminco Non-standard flange, etc. |
| Material | Detector： SUS304 SUS316 SUS316L Hastelloy Titanium Tantalum Nickel PTFE Ceramic, etc. Lining： PTFE Glass Rubber, etc. Head case： Light alloy SUS304 Salt resistant paint case, etc. |
Model QBS
(Non-explosion-proof type)
＜Separated transducer type＞
This model is composed of detector unit, transducer and special cable.
Model NSB
(Intrinsically safe construction / i3nG5)
＜Totally separated detector unit type＞
This model is composed of 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.
