Features - Toshiba LQ500 Operation Manual

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1.2 Features

Compared with the conventional method, this phase difference measurement method using micro
waves, in principle, has the following features.
(1) Not easily affected by contamination.
This method is measuring the variation of the transmission time but not for measuring the
attenuation of the wave motion strength that has been transmitted into the measured matter.
Therefore, it is unnecessary for the window part for sending/receiving microwaves to be
transparent as the optical type.
(2) This meter is not affected as much as an ultrasonic type is by air bubbles
In an ultrasonic system, measurement is affected by attenuation of wave motion by foreign
matters such as air bubbles but the feature of the microwave method is that measurement is
not easily affected by foreign matters such as air bubbles because the method is not using the
attenuation of wave motion strength.
(3) High liability and simple maintenance.
Having no movable part of the rotating pulp density meter nor the protruding portion into the
pipe as with the blade-type pulp density meter, the new method is free from fiber tangling, thus
realizing a high level of reliability. Requiring no consumable parts such as bearings and pulleys,
the maintenance is also easy and simple.
(4) Not easily affected by the speed of flow.
Taking density measurements captivating the dielectric change following the density change in
the measured matter, this method is not affected by the speed of flow.
(5) Not easily affected by the pulp material type or freeness.
Taking density measurements captivating the dielectric change following the density change in
the measured matter, the new method has the feature of not easily affected by the pulp
material type or freeness, etc.
(6) Being of the flow-through type, the new method is capable of continuous measurement.
As others, the new density meter model LQ500 boasts of the following features.
(7) Can easily change the measurement range.
(8) The operation is simple because complex processings such as density calculation and
correction, etc. are performed automatically by micro computers.
(9) Remote control is made possible by using the hand-held terminal AF100LQ3 type (optional),
which is a specialized terminal for communication.
<Supplementary Explanation>
Density meter LQ500 is equipped with the display/operation consoles as standard.
Therefore, if the meter is installed on a location easy for maintenance, the hand-held
terminal is not always needed.
(10) Measurable up to 50% TS density
(11) Conforming to low-level radio wave equipment
The microwave output of this meter is low with about 10mW and this meter conforms to
"Low-level radio wave equipment" specified by Radio Law. Therefore, the customer is free
to use this meter without applying for permission, notification or licensing of this meter.
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