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JF-1A-HH Handheld Conductivity Sensor D2624

JF-1A-HH Handheld Conductivity Meter provides rapid field and laboratory measurement of liquid chemical conductivity. Mainly design for use with ASTM D2624 for measurement of electrical conductivity of distillate fuels, mainly jet fuel to meet ASTM D1655 standards. The JF-1A-HH-CM version is a higher measurement range ideally suited for measuring the conductivity of printing ink.

JF-1A-HH Brochure

Data Sheet

Operation Manual

ASTM Listing


Software Package

JF-1A-HH Handheld Conductivity Sensor

JF-1A-HH Handheld Conductivity Meter provides accurate measurement of fuels and other liquid chemicals in a easy to use handheld unit. This is perfect for laboratory or field measurement of fuel. This device is ASTM D2624 listed.

Advantages of our JF-1A-HH against other handheld conductivity meters include our AC Measurement technology. This allows our handhelds to measure fuel in any sample container and without relaxation of the fuel first. DC devices require a metal grounded sample beaker and time for fuel relaxation. USB Output, free graphing software, internal data storage, easy to use interface. The Handheld can now be field calibrated, using our new handheld calibration kit. Please see brochure below for more details or contact us.

JF-1A-HH Videos

How to run an ASTM D2624 Jet Fuel Sample using our JF-1A-HH Handheld Conductivity Meter.


How to Field Calibrate the JF-1A-HH with our JF-1A-HH-CK Calibration Kit:

AC vs DC Measurement


Why Measure Conductivity with AC (D-2 Inc) Instruments not DC Instruments?

In the graph above the current, which flows through a fuel due to its conductivity, is plotted against time for a DC applied voltage across the fuel. Points to note are as the voltage is first applied there is a steep in-rush current, then, as the electrons pass through; the fuel build up on the electrodes, the current starts to rapidly go back down. Eventually the current stops all together, essentially you have built a battery, not a conductivity sensor.

It can been seen from the last graph that the actual conductivity measured is a “function” of when the sample is taken, hence, the need of DC meters to have “3 Seconds and Read” user operation instruction. Note that the rapid change in the value on either side of the “read window” results in large variability of the measured value, simply due to the time of the reading. If you have any question as two of your customers to in their head count to three seconds and put there arm up, when they are back to back and cannot see the other. Hence the fundamental measure is flawed.

Secondly, the shape of the above curve actually varies as a function of fluid movement past the electrodes; hence the value read in a DC meter is also a function of the rate of flow. Flow slows the rate at which electrons can collect at the electrodes. Hence DC Measurement of any precision requires the fluid to be absolutely still, no movement.

Finally, the curve also varies due the “temperature” of the fuel. As we mentioned you are building a battery. Building batteries is an electrochemical process; the chemical aspect is highly dependent on ambient temperature. It is common knowledge that all chemical reaction rates vary is dependent on the temperature at which they are made. All the above factors lead to significant errors in DC type meters, and absolutely prevented their use in flowing of moving samples.

AC versus DC Measurement. The biggest advantage of AC versus DC measurement is the ability to measure in the product line. Liquid Hydro-Carbons such as fuel build up a DC electrical charge due to work being done on the fuel to move it or filter it. This DC electrical charge affects any DC measurement device such as our competitors at Emcee whose equipment is all DC measurement. DC devices such as the Emcee equipment require the fuel is relaxed and in a grounded metal beaker. Whereas our handhelds and in line sensor can measure the fuel in any sample container and in the product line in real time because the DC charges do not affect our AC equipment. The Emcee in line sensor is “only” an automated spot sampler than an in line sensor due to it’s use of DC measurement technology.

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The JF-1A-HH comes with a full range of accessories, and can be custom adapted for the Ink Industry.  Please contact us for more information.

Standard optional extras include but are not limited to:

Carrying Case, picture above.

A Metal Sampling beaker with grounded wire, in case above.

Field Calibration Tip, pictured to the right and above.

Ink Tip Upgrade: The JF-1A-HH-CM (pS/cm) version can be upgraded with a removable outer electrode for easier cleaning when being used to measure conductivity of Printing Ink.

All units come with a free JF-1A-HH-SP software package that allows the user to run the data from the unit on their PC, graphing conductivity versus time. All JF-1A-HH’s have standard Mini USB connections.

The JF-1A-HH-CK Field Calibration Kit, includes software package, USB cable, and calibration verification tip.

JF-1A-HH-STD Bench Stand, a stand designed to hold the JF-1A-HH upright on a lab bench.

JF-1A-HH-STD (Blank)


Field Calibration Possible

JF-1A-HH w VF Tip on (Plain)

The JF-1A-HH with the VF tip on the device shown in this picture can be field calibrated. The VF tip provides two standards to calibrate the JF-1A-HH with. You simply plug the device into a computer via the USB connection, and walk the device through the step by step calibration procedure. This allows the device to be field calibrated and verified very easily. This tip comes as part of the JF-1A-HH-CK Field Calibration Package, which includes the USB cable and software required to field calibrate a JF-1A-HH or JF-1A-HH-CM.






  • D-2 Highest Available Accuracy due to AC Measurement Technology, see Graph from the Precision Statement in ASTM D2624 on p. 2, from ASTM Research Report RR-D02-1680.
  • Conductivity and Temperature Measurement
  • Easy To Clean Tip available for Ink Measurement Applications
  • Temperature Compensated Measurement
  • Built for Class I Div 2 Hazardous Locations
  • Large button design allows for easy use with gloves.
  • Stores up to 8 Data Locations (User can input Location Names for each pipeline)
  • Standard USB Connection for ease of data transfer to user PC
  • Long Life Lithium-Ion Rechargeable Battery
  • Data Graphing Software (download online at
  • Internal Real Time Date & Clock for Data Record Keeping

See JF-1A-HH Accessories Data Sheet for additional equipment for the Handheld device.


ASTM D2624, ASTM D1655, ASTM D975

DEFSTAN 91-91, IP-274



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