KD-1975 Extreme Environment Sensors

For high pressure, low temperature, and high temperature applications

About the KD-1975 Extreme Environment Sensors

Kaman’s high-temperature displacement sensors provide accurate noncontacting measurement of conductive surface motion in hostile environ - ments. Thermal compensation techniques that maintain sensitivity and linearity with small zero shifts make these accurate high temperature measurements possible.

Kaman’s sensors feature laser-welded Inconel construction, making them perfect for a variety of extreme environment applications. The sen - sors use the versatile KDM-8200 family of signal conditioning electronics. Single channel systems are available in the NEMA-enclosed KDM-8200 or bench-top/ rack-mountable KDM-8200. The NEMA enclosure houses an internal power sup - ply, digital panel meter and window kit. Up to eight measuring channels are available in the rack-mountable KDM-8200. (See Kaman’s KDM- 8200 data sheet for a complete description and additional specifications for these electronics.)

Each sensor has dual coils inside the corrosionresistant case. In operation, an electromagnetic field generated by the active coil penetrates the front of the sensor to induce eddy currents in a conductive target within the sensor’s range. Changes in target displacement result in imped - ance variation in the active coil. This variation is detected by the signal conditioning electronics and converted to a linear analog output signal.

The symmetrical design of the dual coils com - pensates for constant and slowly changing temperatures from -320°F to +77°F or from 77°F to +1000°F. Measurement quality is unaffected by most corrosive gasses and liquids and most other environmental contaminants such as oil, dirt, radiation, and stray RF and magnetic fields.

The cabling has two sections joined by a LEMO ® transition connector: a high-temperature metalsheathed, mineralinsulated section designed to the same environmental specifications as the sensor, and a flexible section of Teflon ® jacketed, twisted pair, coax cable for connection to the electronics unit.

 

Key features KD-1975

  • Operating temperatures from -320°F to +1000°F
  • Excellent linearity
  • Rugged all welded construction
  • Ideal for high pressure environments
  • Hermetically sealed
  • Small error band
  • Corrosive gas or liquid environments
  • KDM-8200 electronics for the KD-1925, KD-1950 and KD-1975

Applications KD-1975

  • Nuclear reactors
  • Steam and gas turbines
  • Turbine and rocket engines
  • Chemical processes
  • Research projects
  • High temperature processing

 

 

Specifications

Measuring range* (maximum mechanical offset 0.010 inch)
KD-1975 0.200 inch (5 mm), KD-1975M** 0.100 inch (2.5 mm)
Electronics
KDM-8200 with internal power supply
Power input
(120 Vac)
Output (electrical zero offset up to 50% of measuring range)
KD-1975 0-2 Vdc nominal, KD-1975M** 0-1 Vdc nominal
Resolution (at mid range)
Static 100 µinch (0.0001 inch) [0,0025 mm] | Dynamic 100 µinch (0.0001 inch) [0,0025 mm]
Repeatability
100 µinch at mid range
Operating temp. range
-320°F to +77°F or +77°F to +1000°F (+538°C)
Nonlinearity
Within ±1% FSO at customer s elected calibration temp.
Typical temperature coefficients (over maximum specified thermal range)
Zero shift 0.01%/°F FSO (0.018%/°C), Sensitivity shift 0.01%/°F FSO (0.018%/°C)
Frequency response
0-2.5 kHz (3 dB). Higher frequency response available
Sensor material
Corrosion resistant high temp. n ickel chrome alloy (Inconel 625) welded and hermetically sealed
Cable material
Nickel chrome alloy (Inconel 600) sheathed, mineral insulated
Standard cable lengths
Hardline 10 feet, Softline 5 feet, Optional lengths Available on request
Target material
Conductors - Nonmagnetic and magnetic
Operating pressure range
To 3500 psi
Standard mounting configurations
Flange mount, smooth body
*Change from standard may degrade specifications. **For magnetic targets.
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