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static monitor & test units
  Sensitive and reliable measurement of low levels of static electricity
  Easy to check, monitor and measure static
  Audible warning of voltages reaching pre-determined levels
  External output facility, user manual and earth bonding cord

The Stat-Attack JCI 140 static monitor can measure static build-up quickly and safely and measurements are clearly displayed in any non-flammable environment where static may be experienced. Used in conjunction with the JCI 145 ionisation test unit, the performance of static neutralising devices can be assessed through either positive or negative voltage through the charge plate.

JCI 100, 140 & 145 static monitors

These hand held instruments enable quick and accurate measurement of static voltages at a distance from the charged source and will also check the effectiveness of static elimination equipment.



Go to The Static Audit information request form.

Using the JCI 140 static monitor

To measure the static charge on a surface, hold the instrument in the hand with the display window facing upwards and the gold plated sensing aperture facing away from you. Now switch on the unit using the on/off/range switch on the grey plastic base plate, you should hear the motor inside start and numbers appear on the display. The three position switch is marked O for off, 1 for a maximum display reading of 2,000 Volts and 2 for a maximum reading of 20,000 Volts. Point the gold plated aperture towards the surface to be measured and hold at a distance of 100mm (4") for an accurate measurement of the surface voltage. Holding the unit closer will raise the reading and further away will lower it.

For ultimate accuracy, the instrument must be connected to ground using the yellow cord provided. The JCI 140 can be used in an ionised atmosphere.

Using the JCI 100 static monitor

Measuring the static charge with this instrument is similar to that of the JCI 140 apart from the fact that the JCI 100 is not suitable for ionised atmospheres.

The instrument must be switched on in a static-free environment and should be held, display uppermost, with the sensing aperture shielded by an earthed surface and the push button pressed for a few seconds to set the automatic zero device.

The JCI 100 can now be held at a distance of 100mm for an accurate reading of the surface voltage.

Setting the alarm

The JCI 140 features an alarm that will indicate to the user when a pre-determined voltage has been exceeded. The adjustment can be made between zero and maximum reading by using a 2mm screwdriver through the aperture marked A on the base of the instrument. The unit is already set at 1000 Volts (approximately the dust attraction voltage).

Do not use this instrument in flammable atmospheres.

Do not drop these instruments, knock them, or allow dust, dirt or fluff to enter the aperture as this will damage or impair the performance.


When the voltage falls below 7.3 Volts LO BATT will flash in the display window and the 9 Volt PP3 battery should be replaced immediately. The battery is located behind the panel on the back of the instrument which slides upwards towards the sensing aperture, the battery is connected using the snap fixing and will provide 4 hours of continuous use.

JCI 145 ionisation test unit

This unit, used in conjunction with the JCI 140 static monitor, is designed to test the effectiveness of static neutralising devices. The unit consists of an isolated charge plate and a power supply which can generate high positive or negative polarity voltages. The voltages applied to the plate will naturally decay very slowly and the JCI 140 will measure the residual voltage in the plate.

Performance of the static neutralising device will be measured by the time taken to discharge the plate. The JCI 145 is fitted with a rocker switch which applies 1100 Volts to the isolated charge plate. The rocker switch allows a positive or negative charge to be applied depending on which pad of the rocker switch is pressed. If both are pressed, the charge plate is grounded reducing the voltage to zero.

Measuring static charge decay times

First, mount the JCI 140 static monitor to the JCI 145 ionisation test unit by positioning the test unit on a flat surface with the switch underneath and the two retaining screws with knurled heads fully unscrewed. Place the JCI 140 static monitor with the display window upwards and sensing aperture facing the mounting hole into the JCI 145.

The monitor can then be slid towards the charge plate until the spigot surrounding the sensing aperture locates into the mounting hole. The two retaining screws can be finger tightened so that their tips locate into the socket head screws in the base plate of the monitor. The instrument is now ready to make measurements.

Do not over-tighten the retaining screws. They need only to be tight enough to retain the sensing aperture of the monitor.

Measuring with the JCI 145

The JCI 140 static monitor should be switched on, using the black slider on the base plate, the 0-2,000 Volt range will give the best resolution for these tests.

Zero the isolated plate by pressing both pads of the rocker switch and check the display registers zero. A reading of 100 Volts is acceptable, if the reading is higher, check the instruments are adequately grounded and repeat the zeroing operation.

Charge decay time tests are carried out by applying a positive charge to the plate by pressing the relevant pad of the rocker switch and check the display exceeds 1,000 Volts. The static neutralising unit should be placed at the recommended distance from the charge plate and operated according to the manufacturer's instructions until the plate is fully discharged and the time taken, recorded.

For ultimate accuracy, the instrument must be connected to ground using the yellow cord provided.

Do not use this instrument in flammable atmospheres.

Do not drop the instrument, knock it, or allow dust, dirt or fluff to enter the aperture as this will damage or impair the performance of the instrument.


Ionising in action

There is no better demonstration of the effectiveness of the Stat-Attack static monitor
range, than Stat-Attack's own technical field force.

Stat-Attack needed a reliable and accurate form of static measurement, as well as a means of assessing the effectiveness of static control systems.

The Stat-Attack technical field force carries the Stat-Attack monitors and testers and many end users monitor their static control systems with these accurate, portable units.

Typical application:

  Locating static problems
  Measuring static build up
  Analysing the effectiveness of static control systems



 JCI 140

 JCI 100

Sensitivity:  2,000 x 20,000 Volts 20,000 or 200,000 Volts (preset)
Power Supply:  1x PP3 9 Volt battery 1 x PP3 9 Volt battery
Dimensions:  34 x 66 x 144mm 34 x 66 x 144mm
Accuracy and linearity:  within +/- 2% FSD within +/- 10% FSD
Display:  3½ digit LCD 3½ digit LCD
Zero stability:  +/- 10 Volts within +/- 2 least significant digits in 100s

JCI 145

Contains bracket, charge plate and housing, to be used in conjunction with JCI 140 unit

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