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On-Line Electronic Liquid Density Monitor/Controller
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A
totally submerged plummet of constant volume functions as the density
sensor for the Densitrolâ. The plummet is fastened by chains to a
reference base and the whole assembly (plummet, chains and reference
base) is housed within a chamber through which the liquid flows.
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The
plummet is weighted so that it assumes an equilibrium position at mid
range with the weight of the chains equally supported by the plummet and
reference base. The weight acting on the plummet will change as the
plummet moves up or down in response to a change in liquid density. For
each liquid density the plummet will assume a definite position
corresponding to that density.
A
Linear Variable Differential Transformer (LVDT) is mounted on the
outside of the sensor chamber and monitors the plummet inside. The
plummet includes a magnetic iron core. When the density changes, the
plummet moves to a new position which is sensed by the LVDT. The voltage
signal from the LVDT is a function of the plummet position and
corresponds to the existing liquid density. |
DENSITROLâ
SPECIFICATIONS
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Range
Limits
0.005
to 0.2 gm/cc
Densities
0.5 to 3.5 gm/cc
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Viscosity
Limit
50
cps max. @ Operating Temp.
For
viscosity greater than 50 cps,
Consult
factory
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Accuracy
±
3% of range or 0.0002 gm/cc,
Which
ever is greater
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Flow
Rate
Typical
flow rates through
the
chamber are 0.1 to 0.5 gpm
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Sensitivity
±½%
of range
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Speed
of Response
Less
than 30 seconds
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Temperature
Compensation
Typically
±50°F
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Output
Standard: 4 to 20 mA DC
Options: 1 - 5 or 10 - 50 mA DC
or –5 to +5 mV DC
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To
View or Download White Paper Technical Description of
DENSITROLâTechnology and Application
Click
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