Name

Conductive Level switch

Measurement
system

Impedance system

Model

NQS-CL
Non-explosion-proof type

NSS-CL
Intrinsically safe construction

Measurement
system

Resistance system

Model

DR-L
Non-explosion-proof type

Object to be measured
Highly viscous liquid

Highly viscous liquid

Acid

Acid

Alkaline solution

Alkaline solution

Beer and froth

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
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)

Model NQS-CL
(Non-explosion-proof type)
<Separated transducer type>

This model is composed of detector unit, transducer and special cable.

Configuration
(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)

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.

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