Name

Lump detector

Model

D-S

LD-11

Explosion
proof
construction

Non-explosion-proof

Intrinsically safe construction(i2BT4)

Measurement
system

Strain system

Description

Fluidized powder in a vessel in a manufacturing process may form lumps, which may move in the vessel due to the rotary flow of gas. This lump detector is used in such manufacturing processes to measure the size of lumps according to the magnitude of the impact caused by a lump colliding with the sensor, and also to determine lump formation rate from the collision frequency.

Features

The high-precision strain gauge provided in the detector constructed to the optimal load design produces measurements, making a distinction possible between vertical and horizontal directions. Sound and reliable design and manufacturing technologies are combined in the device, since it must be pressure-resistant and capable of detecting repeated strains.

Operating
principles

In a gas-phase polyethylene plant, lumps formed in a fluidized powder move in a vessel due to the rotary flow of the gas. When a lump hits the sensor, a strain results from the impact force. Since the strain is proportional to the impact force, it is possible to determine the size of the lump. Measuring this phenomenon enables the operator to know, in advance, the likeliness of the powder in a tank to clog the discharge port and therefore ensure stable plant operation.

Construction

When a lump hits the hollow rod protruding in a vessel, the strain in the hollow rod resulting from the impact is transmitted to the strain gauge in the rod and detected as a change in electrical resistance. The strain gauge consists of a set of x-axis and y-axis elements, which generate respective signals.

Specifications
Measurement range 0~30kg or 0~60kg (According to user's specifications)
Output signal DC4~20mA DC1~5V ※ One of the above signal
Input power AC108V~132V 50/60Hz
Allowable temperature Detector: -20℃~+120℃ (According to user's specifications)
Transducer: Model BB-11: -20℃~+60℃
Transducer: Model BB-12: -20℃~+60℃
Bridge box:  -25℃~+70℃
Indicator:     -10℃~+50℃
Safety maintaining device: -20℃~+60℃
Allowable load According to user's specifications
Allowable pressure According to user's specifications
Weight Transducer: 0.35kg
Indicator:  1.1kg
Bridge box:   4.2kg
Safety maintaining device: 0.15kg
Size Transducer: 49(W)×122(D)×79(H)
Indicator:  49(W)×262.5(D)×128.5(H)
Bridge box:   216(W)×125(D)×259(H)
Safety maintaining device: 12.5(W)×110(D)×115(H) (mm)
Installation Detector: Flange mounting, etc.
Material Detector: SUS304 SUS316 SUS316L, etc.
Head case: Light alloy SUS304 Salt resistant paint case, etc.
Configuration

Model D-S
(Non-explosion-proof type)
<Separated transducer type>

This model is composed of detector, transducer and 2 indicators.

Configuration

Model LD-11
(Intrinsically safe construction / i2BT4)
<Totally separated detector unit type>

This model is composed of detector unit, transducer, 4 safety maintaining devices (safety barrier), and 2 indicators.

Products and Service