D-2 Incorporated JF-1A Bedienungsanleitung
JF-1A CONDUCTIVITY SENSOR
A440-009 Page 1 of 56
FEBRUARY 2009
D-2 INCORPORATED
Jet Fuel 1A Conductivity Sensor
JF-1A
OPERATION MAN AL
REVISION 2.1
FIRMWARE VERSION 2.2
P/N A441-009
This manual covers the operational aspects of the D-2 JF-1A Conductivity Sensor. D-2
continuously strives to meet the full expectations of our customers and e elcome
comments on the structure, content and the ability of this manual to ans er your
questions regarding our product. If you have any suggestions or comments please
contact us at Mail@D-2inc.com. This document is provided ith the understanding that
future versions of this instrument may have additional commands, and the function of
the commands sho n in this document may vary from the present operation.
Revision History
Revision Des ription Date Approved
2.0 In orporated A440-010-FC, Appli ation Note’s 10-006, 10-007 as standard
elements, remove referen es to JFWIN, hange to Hyperterminal
15DEC10 A Fougere
3.0 Corre t Air/Zero Notations 28MAR11 A Fougere
JF-1A CONDUCTIVITY SENSOR
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TABLE OF CONTENTS
OPERATION MAN AL 1
P/N A440-009 1
1.0 GENERAL 4
2.0 USAGE 5
3.0 FUNCTION 5
4.0 THEORY OF OPERATION 6
5.0 D-2 JF-1A SENSOR 7
6.0 MECHANICAL INSTALLATION 8
7.0 ELECTRICAL INSTALLATION
8.0 TEST PROCEDURE 15
.0 SENSOR REMOVAL 17
10.0 SPECIFICATIONS 17
11.0 SERIAL DATA INTERFACE 18
12.0 CALIBRATION 23
13.0 COMPENSATED OUTPUT 24
14.0 FILTERED OUTPUT 25
15.0 MAINTENANCE 27
16.0 OPTIONAL 2-WIRE TEMPERATURE INTERFACE 28
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Appendix A: Service & Warranty Policy 30
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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 ill
measure fuel electrical conductivities bet een 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
Bet een Electrical Conductivity and Temperature of Aviation Turbine Fuels Containing
Static Dissipater Additives”. The sensor can be provided ith an optional 2 (4 – 20mA)
ire temperature interface, allo ing remote monitoring of fuel temperature.
Figure 1
Typical Installation Courtesy of Motiva
JF-1A CONDUCTIVITY SENSOR
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2.0 USAGE
Fuel products such as jet aviation and diesel fuels that are transferred at high pumping
rates may develop a static electrical charge due to the very lo conductance of the
fluid. The D-2 JF-1A Conductivity Meter measures the ability of the fuel to dissipate
that charge. The conductivity of aviation fuels is purposely increased using additives
that reduce the ability of the fuel to store static charge. These additives are normally
injected prior to transfer to the load vessel. The D-2 JF-1A Conductivity Sensor has the
ability to monitor the electrical conductivity of fuel continuously, allo ing its use as a
sensing element in an automated additive injection system. The D-2 JF-1A ability to
measure ith high precision continuously at a high sampling rate (1 hertz) allo s for
precision control of additive injection. The industrial standard 4-20 mA sensor allo s for
its use ith industry standard PID Controller/Display units combined ith additive
injector pumps to provide real-time control over addition of conductivity-enhancing
additives during the transfer process. The Digital Signal Processing (DSP) full numerical
compensation of conductivity for fuel temperature allo s the system to be used in
facilities independent of a ide range of ambient temperatures. The D-2 JF-1A provides
consistent results independent of temperature ( hen temperature compensation is
enabled). Optionally a second 2 Wire (4 – 20 mA) temperature output interface is
available.
3.0 FUNCTION
The D-2 JF-1A Conductivity Meter reads conductivity in picosiemens/meter, fuel
temperature in ITS-90 degrees C, and fully compensated Conductivity in picosiemens/
meter per ASTM D 2624, Appendix X2. These measures are equivalent to CU or
Conductivity Units. The sensor can be used in a 2 ire 4-20 mA industrial control loop
or in conjunction ith a serial input device using RS-232 IEEE Standard ASCII Serial
Input Data. Optionally a 2 ire (4-20 mA) temperature interface can be added to allo
remote monitoring of fuel temperature.
JF-1A CONDUCTIVITY SENSOR
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Figure 2
Major System Components
1 Ball Valve
2 Sensor Mount Adaptor
3 Mounting Nut
4 Locking Collar
6 Electronics Housing
7 Electrical Connection Side
8 Label
9 Installation Reference Plane
4.0 THEORY OF OPERATION
The D-2 JF-1A Conductivity Sensor uses a probe consisting of t o concentric
stainless steel electrodes. When the probe is immersed in fuel, a very lo
frequency AC voltage is applied to the electrodes. Conduction through the fuel
results in an AC electrical current that is amplified, detected, and output as
either direct serial ASCII data, or as a standard 4-20 mA industrial current loop.
The use of a precision AC voltage overcomes the problem associated ith
electrode polarization impedance typical of DC type meters, and residual DC
charges that may exist in the fuel due to static generation from high-speed
pumping. Fluids such as aviation fuels can hold DC charge due to the very lo
conductance of the fluid. These fuels can have conductivities lo er than 5 pS/M
in the absence of conductivity-increasing additives.
1
2
3
4
1
2
4
7
3
6
8
9
JF-1A Conductivity Sensor
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5.0 D-2 JF-1A SENSOR
Figure 3
D-2 JF-1A On-Line Fuel Sensor
With Retractable Mount
The D-2 JF-1A Conductivity Sensor ith Retractable Mount is sho n in Figure 3.
The unit is fully contained in a sealed approved housing. The sensor is designed
to be fully intrinsically safe for operation in fuel facilities. The back cover allo s
for direct conduit connection to the meter and offers both 4 - 20 mA output and
Serial Data Output Connections. The D-2 JF-1A Conductivity Sensor can be
operated as a “t o ire” device under ISA 4 - 20 mA loop specification
ANSI/ISA-12.12-1994 – Non-incendive Electrical Equipment for Use in
Hazardous Locations.
JF-1A Conductivity Sensor
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6.0 MECHANICAL INSTALLATION
See Installation and Safe Use Manual for detailed mechanical installation
instructions.
6.1 LOCATION
The JF-1A Sensor should be mounted in do nstream proximity to the additive
injection site. The user MUST insure that additive ill be completely mixed at
the point at hich the fuel is sensed by the JF-1A sensor. An in-line mixer can
be used, or more conveniently the injection site can be follo ed by a pipe “T” or
bend to cause turbulent flo mixing of additive. Insufficient mixing ill result in
poor controller results and erratic average load conductivities.
NOTE: The Sensor should be mounted well away from possible
sources of electromagnetic noise, such as large pump motors, AC
power Lines, or electrical circuits containing large transient switching
currents.
Note: Prior to arc welding in proximity to the JF-1A sensor (closer
than 10 meters (30 feet) the sensor should be either removed from
the product line or at a minimum disconnected from all electrical
connections to the sensor. Welding circulation voltages can exceed
protection ratings of the sensitive output circuits located in the JF-1A
sensor.
6.2 PIPE CONNECTIONS
See Installation and Safe Use Manual for detailed mechanical pipe connections
instructions.
6.3 PIPE VALVE
The nipple should be supplied ith a 1” Open Throat Ball Valve.
NOTE: The Ball Valve M ST Have a Clear Opening of 1.0” through its
center to allow the D-2 sensor to pass unobstructed. Ball valves can be
purchased directly from D-2.
JF-1A Conductivity Sensor
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6.3 SENSOR ADAPTOR
The D-2-supplied sensor adaptor should be mounted directly into the outboard
side of the ball valve using Teflon tape or other suitable thread sealer.
6.5 High Flo Rate Installation
See Installation and Safe Use Manual for detailed mechanical installation in high
flo rate lines.
7.0 ELECTRICAL INSTALLATION
See Installation and Safe Use Manual for detailed electrical installation
instructions.
7.1 2-Wire 4-20mA LOOP CONSIDERATIONS
Warning 2-Wire Loop Maximum Resistance including wire can not
exceed 500 ohms, or internal intrinsic over voltage safety devices in
the JF-1A sensor may be activated.
The 4-20 mA Loop supply open circuit voltage must be consistent ith the
“Open Circuit Supply” needs of the JF-1A at both its minimum and maximum
indicating currents. The JF-1A has both input voltage limiting protection and
polarity protection. These protection devices affect user supply voltage
requirements. If proper loop supply voltage is not maintained, errors in
indicated conductivity current may occur. The 4-20 mA loop supply voltage
should comply ith specifications section of the manual.
The maximum loop po er supply voltage, under all conditions, must also
prevent the voltage across the sensor loop terminals from exceeding the
maximum voltage listed in the specifications section of the manual. If this
condition is not maintained, errors in the current output may occur.
D-2 recommends that a 24 VDC isolated supply be used to po er the
JF-1A Conductivity Sensor
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instrumentation loop. The supply should have high isolation (>500 Mohm), and
be single point grounded. The current loop should be ired using shielded
t isted pair ire. The shield should also be single point grounded to a solid
earth ground.
Sensing resistors should be capacitive by-passed to ensure lo common mode
loop noise. Sense resistors should be by-passed using the follo ing table as a
guide. Note the capacitor should be rated to sustain the orking voltage for the
loop and should comply ith the requirements of the local electric code.
R-Loop By-Pass
OHMS uF
250 1
350 2.2
500 3.3
In the figure belo a typical loop iring ith by-pass capacitors is sho n for the
JF-1A sensor. The loop sho s t o sensing resistors in series ith the JF-1A
sensor. At the negative terminal of the Isolated Po er Supply the “loop” is AC
grounded using a capacitor. This capacitor helps to eliminate “common mode”
voltages that may be coupled to the loop. Note the sense resistors should be
connected to isolated input detectors such that entire loop remains floating
eliminating any ground conflicts of differences. Please consult the factory for
specific application support in the design of your measurement system.
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