JF-1A CONDUCTIVITY SENSOR
A440-009
Page 4 of 56
FEBRUARY 2009
1.0 GENERAL
The D-2 JF-1A Conductivity Sensor is a reliable instrument for the continuous
measurement of electrical conductivity of fuels. The JF-1A Conductivity Sensor
incorporates innovative electronics Digital Signal Processing (DSP) techniques to
accurately determine the electrical conductivity of fuel products. The instrument will
measure fuel electrical conductivities between 0 and 2000 picosiemens/meter (pS/M),
although it is optimized and normally used in the 0 to 500 pS/M range. The sensor
offers RS-232 data output, or traditional industrial loop compliant 4-20 mA. The 4 -20
mA output can be user programmed to represent a prescribed range of conductivity.
User configurations and instrument calibration terms are stored in internal non-volatile
memory. The D-2 sensor is continuously internally electronically calibrated. Absolute
calibration relies only on the sensor cell constant that is very stable by design. The
conductivity sensor has a built-in temperature sensor. Output from the temperature
sensor is used to fully compensate the conductivity output from variations due to
changes in electrical conductivity as a function of temperature per the ASTM D 2624,
Appendix X2 Standard (Appendix A), (See Also Document “NRC-22648 The Relationship
Between Electrical Conductivity and Temperature of Aviation Turbine Fuels Containing
Static Dissipater Additives”. The sensor can be provided with an optional 2 (4 – 20mA)
wire temperature interface, allowing remote monitoring of fuel temperature.
Figure 1
Typical Installation Courtesy of Motiva
