Dead Weight Pressure Gauge Weight/Piston Height Sensor Amplifiers

Capacitance Displacement Sensors
  • For use with larger CDT series sensors and custom designed collision avoidance and proximity sensors
  • High accuracy and thermal stability
  • Simple calibration procedure
  • May be used with sensor temperatures up to 200°C
  • Internal adjustment for different sensor sizes
  • Standard 1kHz response, 5kHz optional

DESCRIPTION
The FT1000-DX module is a universal, single channel displacement amplifier designed for use with large capacitive sensors. Typical applications included proximity detection and collision avoidance systems.

More recently, the electronics have been used with custom designed ring sensors as shown above for weight/piston height indication of deadweight pressure gauges.

The FT2000-DX module is a twin channel version of the single channel unit. The electronics are housed in a ruggedised enclosure to cater for a wide range of industrial applications and are designed to operate with sensor temperatures up to 200°C. Power supply is 11-18VDC. System output is 0-10V analogue.

 

SPECIFICATION

SYSTEM PART NUMBERS

Single Channel Module FT1000-DX
Twin Channel Module FT2000-DX

 

MEASUREMENT RANGE

CDT Sensor Size Electrode Linear range Max Working
Range		 Typical Capacitance
Over Linear Range
Ø 60.0mm Ø16.0mm 0.80 - 16.0mm 40.0mm 2.240pF to 0.112pF
Ø120.0mm Ø32.0mm 1.60 - 32.0mm 80.0mm 4.480pF to 0.224pF
Ø240.0mm Ø64.0mm 3.20 - 64.0mm 160.0mm 8.960pF to 0.448pF

Stated measurement ranges are against metallic surfaces and may be reduced when applied to non-metallic materials. Figures quoted are for CDT100 series sensors calibrated with FT1000-DX or FT2000-DX electronics.

GAIN RANGE 20:1 variable gain amplifier with 1/X output

 

Electrode Area Jumper Posn Input Range Output
201.09 mm² "High" gain 2.240pF to 0.112pF 0.5v to 10v
804.35 mm² "Med" gain 4.480pF to 0.224pF 0.5v to 10v
3217.41 mm² "Low" gain 8.960pF to 0.448pF 0.5v to 10v

 

PERFORMANCE
Accuracy ± 0.2% of full scale
Repeatability ± 0.1% of full scale
Stability 100ppm/°C typical
Filter Type 3 pole Butterworth 1kHz (100Hz to 5kHz by resistor change)
Rise Time 300 µs (1kHz filter)
   
INPUTS Sensor Type CDT & DW series (low temp)
Connector Type Microdot Cable Type Low noise
100% screened flexible coaxial
Cable Length 2 metres standard, 5 metres maximum
Cable Diameter 2.0mm
OUTPUTS Connector Type BNC Cable Type 50 Ohm coaxial
Cable Length Up to 100 metres
Range 0-10V analogue
TEMP RANGE Electronics 0 - 50°C
Sensor 0 - 200°C
POWER SUPPLY Standard Supply 11-18VDC
Power Consumption 120mA @ 18VDC, 200mA @ 11VDC
GENERAL Module size (W x D x H) 200mm x 100mm x 60mm
  Mounting 4 hole access through base plate

 

Deadweight Pressure Gauge Sensor

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