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Specifications
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Size 12 |
Size 45 |
| Maximum Temperature |
350 C (622 F) |
350 C (622 F) |
| Maximum Pressure |
3000 psi (20.7 MPa) |
3000 psi (20.7 MPa) |
| Inside Diameter |
12 mm (0.5 in.) |
45 mm (1.77 in.) |
| Maximum field penetration |
1.8 mm (0.07 in.) |
6.3 mm (0.25 in.) |
| Area Coverage |
28% |
26% |
| Typical capcitance |
40 pF |
70 pF |
Housing Assembly
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| Length |
18.89 cm (3.5 in.) |
9.27 cm (3.65 in.) |
| Diameter |
12.7 cm (5.0 in) |
14.92 cm (5.87 in) |
| Mounting holes |
Four 3/4 - 10 UNC-2B at equal 90 degree spacings on 8.45 cm (3.25 in.) dia bolt circle |
Four 5/8 - 11 UNC-2B at equal 90 degree spacings on 10.0 cm (3.94 in.) dia bolt circle |
Inside diameters up to 300 mm (12 inches) available. For larger sizes, consult factory.
Heater
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band type
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| Temperature Sensor |
J-type thermocouple |
| Controller |
self-tuning PID |
Process Pressure sensor (3000 psi range, 6000 psi max)
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± 0.2% full scale
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| Process Temperature sensor (400 C range) |
± 1°C |
Current Preamplifier
|
2200 Volts / Ampere
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| Lock-in Amplifier |
Stanford Research Systems SR810 |
| Frequency Range |
0.001 Hz to 100,000 Hz |
| Permittivity Range (at 1 KHz) |
1.0 to 10,000 |
| Conductivity range |
10-9 to 10-2 Siemens / meter |
Instrument Interface
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GPIB
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| Outputs to DCS or PLC |
2 analog outputs, 4 - 20 mA |
| Proceptor Software Operating System |
Windows |
To estimate uncertainty in a prospective application, locate a point horizontally at the
relative permittivity of the primary material and vertically at the relative permittivty of the
additive, then read the uncertainty.
The feasibility of a prospective application can be determined by calculating the measurement
precision from the mixing equation
e1/3 = fAeA1/3 + fBeB1/3
and comparing to the requirements of the application. Alternatively,
the figure can be used. The figure shows contours of constant uncertainty calculated from the mixing equation
on a plot of additive relative permittivity versus primary material relative permittivity. The
relative permittivities of the materials are used to locate an operating point, and the labeled
zones are used to read off the accuracy. Successive measurements at a single frequency once every
two seconds could be averaged over three minutes to yield nearly one hundred measurements, reducing
the uncertainty by a factor of ten. If the indicated resolution meets the application requirements,
then dielectric measurements can be effectively used for in-line composition determinations.
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