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Advanced Continuity Tester (ACT), hand-held with Go/No-Go Visual Display
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Advanced Continuity Tester (ACT), hand-held with Go/No-Go Visual Display

  • Advanced microprocessor technology.
  • Go / no-go continuity check.
  • Digital resistance display.
  • Dynamic checking of bonding reels.
  • Simple to operate, auto switch on/off.
  • Self tests and calibrates before every test.
  • Robust and impact resistant.
  • Compact, Lightweight, Portable
  • ATEX certified for Zone 1 or Zone 2 hazardous area use.

Systems which transfer flammable liquids or powders must be bonded, or electrically connected in order to safely dissipate static electrical charges, it is also important that these systems are tested regularly, because deterioration could result in a hazardous situation developing. Traditionally, a resistance or multi-meter is used. These instruments are normally cumbersome, delicate, and should be used by skilled technicians. They do not detect the small changes in resistance which affect a bonding system and they are also not responsive enough to detect a worn bonding reel bearing or slip ring. Consequently it is unlikely that bonding systems will be checked frequently or in the correct manner. A number of specialised bonding system testers have been developed but they all have a variety of other shortcomings. The Advanced Continuity Tester (ACT) has been specifically designed for this task ONLY, so it does not sacrifice performance in the interests of being a multi purpose instrument and it is based on the very latest microprocessor technology.

The ACT is a foolproof Go/No Go device which can be used by non-skilled personnel, and it is controlled by a microprocessor which offers significant operational advantages. Touching the clips together switches the ACT on. It self checks calibration and available battery power and only then allows the test to proceed. The ACT uses a dual colour light emitting diode (LED) to indicate the condition of the bonding system under test, which makes the results very simple to interpret. If the system resistance is less than the set point, the LED will flash Green (Pass). If the system resistance is more than the set point, the LED will flash Red (Fail). The default set point is 25 Ohms which is in accordance with the JIG Guidelines for aviation fuel systems, but alternative set points (if required) can be specified at the time of order. In addition, throughout the test, a two figure digital display tells the operator the actual system resistance (in Ohms). PASS FAIL The ACT housing is ergonomically designed to be comfortably held in the hand and is moulded from impact resistant Polyamide, so it is lightweight, robust, and is highly portable.

DSS0251-06 The ACT incorporates two sealed, non rechargeable, high capacity batteries which gives it an extended operational life, and the battery life is further enhanced by a number of power saving features. The ACT does not have a constant power usage, it checks the resistance 200 times per second. Also, the microprocessor automatically switches off the ACT after a time out period at any stage of the operation, even if the clips are left connected or touching at the end of the test. The ACT can be supplied with a calibration certificate if required, but in any event it self checks and adjusts calibration before every test. The ACT is ATEX certified for use in Zone 1 or Zone 2 hazardous areas, unlike many other devices which are currently in use. A Stowage Bracket is available which can be used to neatly stow the ACT when not in use, or can hold the ACT securely during testing.


  1. Self Check/Start Up.
  2. Touch and hold the clips together. The ACT adjusts calibration and checks battery power.
  3. If display shows ER the ACT is either out calibration or the battery is discharged.
  4. If the calibration is correct and the battery sufficient power, the LED flashes Green and display shows 88 (segment check). Separate clips within 10 seconds.
  5. The LED flashes Red and the display shows HI (open circuit). The ACT is now ready to check the bonding system.


  1. Bonding System Test.
  2. Within 15 seconds connect one clip to a clean unpainted metal point on the system framework or vehicle chassis and connect the other clip to the system bonding clip.
  3. If the LED flashes Green the system resistance is less than the set point. The bonding system is serviceable.
  4. If the LED flashes Red the system resistance is greater than the set point. The bonding system is unserviceable and the problem MUST be rectified before further use.
  5. The actual system resistance in Ohms is displayed throughout the test and this may be recorded.
  6. The condition of the bonding reel slip ring or bearing can be checked by reeling the cable in or out with the ACT still connected. A defective reel bearing or slip ring will cause the LED to change colour from Red to Green and back again.
  7. At the end of the test remove the clips. The LED flashes Red and the display shows HI (open circuit). The ACT will now time out in 15 seconds and switch off.

Always wait for the ACT to switch off at the end of every test before starting a new test.

TypeGo-No Go Continuity Tester.
Set Point25 Ohms (default). Option 1 to 40 Ohms.
Test Frequency200 tests per second.
Display UpdateEvery 100 tests (0.5 seconds).
LEDDual colour high intensity (Red/Green).
DisplayTwo digit 7 segment LCD, 12mm character height. Selectable on or off in software.
HousingAntistatic Black Nylon 66.
Battery HolderBlack Nylon 6.
BatteryLithium Thionyl Chloride 3.6V.
MicroprocessorAtmel AVR EXMEGA 16A 4U.
Flying Leads2 x 0.65m long, with plugs/clips
ATEX ApprovalEx II 2G Ex ib IICT4 Gb.
Approval CertificateZELM13 ATEX 0509.
Operating Temperature-10 to +45 degC.
Nett Weight180g
Width40 mm
Height172 mm
Shipping Information
ProductPackaged Dimensions & WeightCustoms Tariff Code
ACT26 x 16 x 8 cms, 0.33 Kg Gross90268020

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