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Home  >>  Products  >>  pH & Conductivity  >>  RF-IT and CE-IT Insulator Testers

RF-IT & CE-IT Insulator Testers

RF-IT - Above Ground Tester



IMPORTANT NOTE: Do not use this instrument in an explosive environment.

Above Ground
  • Move bolt to bolt to find contact

  • Digital Meter

  • Uses Radio Frequency to test effectiveness
    of above ground insulators

  • Battery Operated

  • Audible Beep

  • Auto Shut-Off feature

  • Use on structure regardless of CP

RF-IT Features


The Model RF-IT is a highly sensitive device used to test above ground pipeline insulators. The automatic RF-IT allows the operator to pinpoint the precise contact point. The RF-IT emits an audible beep and when the operator gets closer to the point of contact the unit starts beeping faster. A sliding scale LCD meter moves from left to right.

Theory of Operation
The RF-IT works using Radio Frequency. The Radio Frequency signal is applied to one side of a pipe by one of the two probes. The second probe then receives the high frequency signal. If the received signal is almost as strong as applied, the pipe is shorted.

The RF-IT has an internal band-pass filter which will filter out all the frequencies above and below 221kHz. This allows taking measurements on pipelines that are under cathodic protection or have other induced or impressed currents or signals. It is important to note that because the RF-IT uses Radio Frequency to measure the effectiveness of an insulator, the measurement results can not be displayed in Ohms.

RF-IT Technical Data

Technical Data
Dimensions: 8" length x 4" width x 3" depth
Operating Weight: 2 lbs.
Shipping Weight: 3 lbs.
Battery Operated: 6 Alkaline "AA" batteries (replaceable)
Cables and Probes: Included



CE-IT - Below Ground Tester

CE-ITThe Model CE-IT is factory calibrated, ready to use
and requires no field adjustments.

Below Ground
  • Senses external polarity
  • Matches external polarity
  • Sense external voltage
  • Matches internal voltage reference with external voltage
  • Sends charging voltage
  • Senses flowing current throughout the testing cycle
  • Gives result of test considering the above tested parameters
  • Expected battery life exceeds 50 hours
  • IMPORTANT NOTE: Do not use this instrument in an explosive environment.

CE-IT Features


The Model CE-IT Insulator Tester is fully automatic and highly sensitive electronic instrument designed to test the effectiveness of buried pipeline insulators. The CE-IT can also be used to determine isolation condition of pipelines in road crossing casings.

The Model CE-IT circuit automatically adjusts to the voltage polarity present on the underground piping system under test. A read out of the test results are displayed in English on the LCD meter. The entire testing procedure is complete in less than 30 seconds and an audible signal alerts the operator when the test cycle is completed. Although the Model CE-IT is equipped with power start switch, the instrument will automatically shut off in 10 minutes if not in use, to conserve batteries.

CE-IT Technical Data

Technical Data
Dimensions: 8" length x 4" width x 3" depth
Operating Weight: 2 lbs.
Shipping Weight: 3 lbs.
Battery Operated: 6 Alkaline "AA" batteries (replaceable)
Cables and Probes: Included


Principle of Operation

The actual resistance of a buried insulator depends on many factors, such as the environment in which the joint is located. In a very low resistivity environment, the normal resistance measurement for an insulating joint may be as low as 0.5 ohm. Checking the insulating joint of a buried pipeline for current leakage is often a more reliable test than an internal resistance test. For this reason, the CE-IT looks at the electrical characteristics of the joint itself rather than the internal resistance. In general, the following conditions are evidenced when an effective insulator is measured:
  1. Substantially different ground voltage readings are evidenced on opposite sides of the insulator. The delta Vg is usually smaller or even in the opposite polarity (interference coupling) on the side of the insulator which is opposite from the protected segment of the pipe.
  2. The percentage of current leakage that the joint will allow to flow through it is low (25 percent or less).
  3. The voltage drop across the insulator is significant. (The voltage drop across an ineffective or shorted insulator would be negligible in the range of 10 millivolts or less).
The Model CE-IT Insulator Tester uses the above three criteria to determine if the insulator and testing path (i.e. connections from the test station to both ends of the insulator) is either: open, shorted or good. To operate: The CE-IT is connected to both sides of the buried insulator through a test station.

Figure 1
When the power to the CE-IT is turned on and the "Start" button is pressed, the following sequence of events occurs:
  1. First the CE-IT senses the polarity of the voltage at the test leads and then matches that polarity with the internal voltage in the instrument.
  2. The CE-IT then senses the external voltage applied to the pipe and matches the internal voltage reference with the external voltage. (The maximum external voltage should not exceed 50 volts DC or 10 volts AC.)
  3. After matching the external polarity and voltage, the CE-IT then measures the charging current applied to the protected side of the pipeline and senses the current flowing through the insulator throughout the testing cycle (about 20 seconds).
  4. The CE-IT then displays the result of the completed test. A "Short" is indicated if the voltage drop across the insulator is between 12 and 10 millivolts or less, and/or the current leakage through the insulator is above 25 percent of the current applied to the protected pipe. An "Open" is indicated in the case of an open wire connection from the test station to the pipeline or the CE-IT test leads. A "Good" is indicated when the ground voltage readings (delta Vg) are smaller or of opposite polarity on the unprotected side of the pipeline, the current leakage through the insulator is less than 25 percent and the voltage drop across the insulator is greater than 10 to 12 millivolts.



Prices subject to change    Prices listed in US dollars for domestic shipments within US, Canada, & Mexico only    Export orders require quotations - click here for a quote     For more info call us 1-800-762-2478 or 954-946-9454.
Item Number Item Prices

6 AA Batteries (installed), Probe, Red with lead wire and needle point tip, Probe, Black with needle point tip, Additional needle tips, stored in small black vinyl tubes, Instruction manual and Warranty Card
CD-RF-IT ABOVE GROUND Insulator Tester $536.00
CD-CE-IT CE-IT BELOW GROUND Insulator Tester $714.00


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