Manufacturer of Level Switch, Level Transmitter,
Detector and Sensor DITECH,LTD.
DITECH,LTD.
Name
Conductive Level switch
Measurement
system
system
Impedance system
Model
NQS-CL
Non-explosion-proof type
NSS-CL
Intrinsically safe construction
Measurement
system
system
Resistance system
Model
DR-L
Non-explosion-proof type
Object to be measured
Highly viscous liquid
Acid
Alkaline solution
Beer and froth
Description
This device has been developed to detect the level of substances that are difficult to measure due to high conductivity (electrical conductivity) such as high-viscosity liquids. The conductive level switch detects the liquid level in a tank via conductivity changes to output a contact point signal.
Operating
principles
principles
Impedance system
The measurement circuits incorporate the impedance bridge and provide a measuring range up to 200 mS/cm. When the conductivity change reaches the preset threshold, this device delivers a contact output as a level signal.
Resistance system
This system uses differences in electrical resistance to detect the level of one of two substances of substantially different electrical resistance values, such as beer and its foam, when they are present together.
Specifications
| Stable detection range | Min. ≦ 0.5pF Max. ≧ 1000pF Peculiar resistor ∞～0.5Ω |
| Output contact | Model NQS-C： a, c, b 250V 5A (non-inductive load) / open collector / Thyristors / SSR Model NSS-CL (Model PS-7)： a,c,b 200V 1A 100VA (non-inductive load) Model DR-L： a, c, b 200V 1A 100VA (non-inductive load) / open collector / Thyristors / SSR |
| Input power | Model NQS-CL： AC105V/210V 50/60Hz or DC24V Model NSS-CL (Model PS-7)： AC105V/210V 50/60Hz Model DR-L： AC105V/210V 50/60Hz or DC24V |
| Power consumption | Model NQS-CL： 4.5W Model NSS-CL： 4W Model DR-L： 20W |
| Allowable temperature | Detector： －200℃～＋1100℃ (Depends on the specifications) Transducer： Model PS-1CL： －10℃～＋50℃ Transducer： Model TR-1CL： －10℃～＋50℃ Power source： Model PS-7： －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: (Depends on the specifications) |
| Allowable pressure | Detector: (Depends on the specifications) |
| Weight | Transducer： Model PS-1CL： 4.3kg Transducer： Model TR-1CL： 4.3kg Power source： Model PS-7： 2.0kg |
| Size | Transducer： Model PS-1CL： 200(W)×149(D)×220(H) Transducer： Model TR-1CL： 200(W)×149(D)×220(H) Power source： Model PS-7： 80(W)×101(D)×210(H) (mm) |
| Installation | Detector： Flange mounting Screws mounting Ferrule IDF, etc. |
| Material | Detector： SUS304 SUS316 SUS316L Hastelloy Titanium Tantalum Nickel SiC Graphite PTFE Ceramic, etc. Head case： Light alloy SUS304 Salt resistant paint case, etc. |
Configuration
(Impedance system)
(Impedance system)
Model NQS-CL
(Non-explosion-proof type)
＜Separated transducer type＞
This model is composed of detector unit, transducer and special cable.
Configuration
(Impedance system)
(Impedance system)
Model NSS-CL
(Intrinsically safe construction / i3nG5)
＜Totally separated transducer type＞
This model is composed of detector unit, transducer, relay power source and special cable that is 3 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 NQS-CL.
Configuration
(Resistance system)
(Resistance system)
Model DR-L
(Non-explosion-proof type)
＜Integrated transducer unit type＞
This model is of compact type in which both detector unit and transducer are integrated.
