Manufacturer of Level Switch, Level Transmitter,
Detector and Sensor DITECH,LTD.
DITECH,LTD.
Vertically anchored wire
Level transmitter for large tanks
QBS-AW
NSB-AW
proof
construction
Non-explosion-proof
Intrinsically safe construction(i3nG5)
This level transmitters can be designed to detect the level of powder or fluid in the tank as much as 30 m height.
The vertically anchored wire level transmitter for large tanks has been developed to measure the level in a large tank. Conventional immersion level transmitters might be swept away and unable to measure the powder or liquid in a stirring vessel. This level transmitter can be effectively used in such applications. Each unit is designed for the fluid condition of each target tank for safe level measurement.
principles
Every material has intrinsic electrical characteristics such as permittivity and conductivity. Housings are installed at top and bottom of the tank (silo) to anchor the wire probe. The probe detects capacitance that changes with increases or decreases of the object being measured and converts the detected capacitance into a standardized signal.
DITECH fabricates the wire to desired specifications at its factory according to tank height, ranging from small tanks up to 10 m high, to large-class tanks over 20 m high. One housing contains a wire length adjuster to enable the operator to adjust the wire flexure without removing the wire. This level transmitters assure a highly reliable and stable detection for powder having a low apparent dielectric constant. Covered wire for prevention of contamination is also available.
| Measurement system | Capacitance system |
| Measurement range | Max. 30m (Depends on the specifications) |
| Output signal | DC4～20mA DC1～5V ※ One of the above signal |
| Input power | Model QBS-AW (Model PS-0AW)： AC105V/210V 50/60Hz or DC24V Model NSB-AW (Model PS-2)： AC105V/210V 50/60Hz |
| Power consumption | 10W |
| Allowable temperature | Detector： －10℃～＋70℃ (Depends on the specifications) Transducer： Model PS-0AW： －10℃～＋50℃ Transducer： Model TR-2AW： －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 pressure | Detector： 3Mpa (approx. 30.6kg/cm2G) (Depends on the specifications) |
| Weight | Transducer： Model PS-0AW： 5.5kg Transducer： Model TR-2AW： 4.3kg Power source： Model PS-2： 7.6kg |
| Size | Transducer： Model PS-0AW： 216(W)×125(D)×259(H) Transducer： Model TR-2AW： 200(W)×149(D)×220(H) Power source： Model PS-2： 250(W)×145(D)×275(H) (mm) |
| Installation | Detector： Flange mounting, etc. |
| Material | Detector： SUS304 SUS316 PTFE Polyethylene, etc. Head case： Light alloy SUS304 Salt resistant paint case, etc. |
Model QBS-AW
(Non-explosion-proof type)
＜Separated transducer type＞
This model is composed of detector unit with 2 housings and 1 wire, transducer and special cable.
Model NSB-AW
(Intrinsically safe construction / i3nG5)
＜Totally separated detector unit type＞
This model is composed of detector unit with 2 housings and 1 wire, 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-AW.
