Manufacturer of Level Switch, Level Transmitter,
Detector and Sensor DITECH,LTD.
DITECH,LTD.
Capacitive Level transmitter
for large tanks
QBS-LL
NSB-LL
proof
construction
Non-explosion-proof
Intrinsically safe construction(i3nG5)
This level transmitters are designed to use under severe conditions (high temperature, high pressure, and high load) like measuring molten resin in polymerization vessel or agitation vessel.
The capacitive level transmitter for large tanks has been developed to measure the level in a large tank. Conventional immersion level transmitters might be unable to measure under severe conditions (high temperature, high pressure and high load) like molten resin in polymerization vessel or agitation 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.
Large sensor type with length of 10m, probe-joint type, housing-joint type and light body type are also available, depending on measurement conditions.
principles
Every material has intrinsic electrical characteristics such as permittivity and conductivity.
Housings are installed on the tank to anchor the detector. The probe detects capacitance that changes with increases or decreases of the object being measured and converts the detected capacitance into a standardized signal.
Various types of detector can be offered for each 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.
| Measurement range | Max. 10m (Depends on the specifications) |
| Output signal | DC4～20mA DC1～5V ※ One of the above signal |
| Input power | Model QBS-LL (Model PS-0AW)： AC105V/210V 50/60Hz or DC24V Model NSB-LL (Model PS-2)： AC105V/210V 50/60Hz |
| Power consumption | 10W |
| Linearity | ±0.5% FS |
| Allowable electrode conductance(G) |
3μS |
| Allowable electrode distribution capacity(Co) |
0～2000pF |
| Allowable temperature | Detector： －200℃～＋1100℃ (Depends on the specifications) Transducer： Model PS-0LL： －10℃～＋50℃ Transducer： Model TR-2LL： －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-0LL： 5.5kg Transducer： Model TR-2LL： 4.3kg Power source： Model PS-2： 7.6kg |
| Size | Transducer： Model PS-0LL： 216(W)×125(D)×259(H) Transducer： Model TR-2LL： 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-LL
(Non-explosion-proof type)
＜Separated transducer type＞
This model is composed of large size detector unit, transducer and special cable.
Model NSB-LL
(Intrinsically safe construction / i3nG5)
＜Totally separated detector unit type＞
This model is composed of large size 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-LL.
