Manufacturer of Level Switch, Level Transmitter,
Detector and Sensor DITECH,LTD.
DITECH,LTD.
Name
Relative permittivity-correcting
Level transmitter
Model
QBS-DC
NSB-DC
Explosion
proof
construction
proof
construction
Non-explosion-proof
Intrinsically safe construction(i3nG5)
Main
measurement
object
measurement
object
Fluids in which the relative permittivity tends to be unstable.
Description
The relative permittivity-correcting level transmitter has been developed to determine an accurate level for fluid level measurement applications in which the relative permittivity tends to be unstable due to changes in components or mixture ratios.
Operating
principles
principles
During the measurement of the level of a fluid of unstable relative permittivity during the process of concentrating a two-component mixture fluid or a single-component fluid, a continuous change occurs in the relative permittivity at each stage of the process. To obtain a net level signal, a corrective calculation is performed on the signal of the level transmitter using a relative permittivity signal. For this purpose, a short detector (compensating probe) of a relative permittivity transmitter is installed at a location deeper than the detector of the level transmitter.
Signal of level transmitter CL=(ε-1)Cℓ
Signal of relative-permittivity meter Cε=(ε-1)C
ε:Relative permittivity of liquid (variable)
C: Electrostatic capacitance of probe per unit length (invariable)
ℓ: Net level signal
ℓ=CL/Cε=(ε-1)Cℓ/(ε-1)C
Specifications
| Measurement system | Capacitance system |
| Measurement range | Min. range 0～5mm , Max. range 0～10m (Any other range are possible) |
| Output signal | DC4～20mA DC1～5V ※ One of the above signal |
| Input power | Model QBS-DC (Model PS-0IF)： AC105V/210V 50/60Hz or DC24V Model NSB-DC(Model PS-2)： AC105V/210V 50/60Hz |
| Power consumption | 20W |
| Allowable temperature | Detector： －200℃～＋1100℃ (Depends on the specifications) Transducer： Model PS-0DC： －10℃～＋50℃ Transducer： Model TR-2DC： －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： 100MPa (approx. 1020kg/cm2G) (Depends on the specifications) |
| Weight | Transducer： Model PS-0DC： 5.5kg Transducer： Model TR-2DC： 4.3kg Power source： Model PS-2： 7.6kg |
| Size | Transducer： Model PS-0DC： 216(W)×125(D)×259(H) Transducer： Model TR-2DC： 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. |
Configuration
Model QBS-DC
(Non-explosion-proof type)
＜Separated transducer type＞
Configuration
