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[25 Июль 2025, 13:58:25]

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[25 Июль 2025, 13:58:25]

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DENSITY GAUGE
INSTALLATION MANUAL
(Датчик плотности шлама - предв.)


Начало текста:

INTRODUCTION

GENERAL
This manual provides instructions for the installation of the Process Automation
Model NDG-421(S) measurement system with integrated density sensor and
processing electronics (transmitter).

RADIATION INFORMATION

The radiation emitted by source(s) used in the measurement device is no different
from the natural, or background, radiation that is always around us, except that it is
more concentrated. The means of assuring personal safety then, is the limiting of the
amount of radiation exposure that a person receives. To do this, minimise the time
spent in the immediate area of the source (within a one-metre distance) when the
source is ON, and be sure the source is OFF when it is necessary to work on the
detector or to clear the measuring gap.


***

PRINCIPLE OF OPERATION
The Gamma Density Gauge utilises the principle of gamma radiation absorption to measure
material density or percent solids. As material passes between a source of gamma radiation
(normally the isotope 137Cs) and a gamma detector, this material absorbs some of the
radiation. Radiation not absorbed during its passage through the material is received and
sensed by the gamma detector. As the mass of material/material density increases, the
absorption increases thereby reducing the radiation received by the detector.
NDGC-421(S) SYSTEM

The model NDGC-421 provides an integrated measurement system where the transmitter is contained within the Density Sensor Assembly (DSA-S) and no separate transmitter is
required.

The radiation transducer employed in the NDG-421 Density gauge is a Scintillation (S)
type.



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