Knopp Incorporated
"When You Test, Use The Best"


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Other Products

Type CL-6 Loading Transformer

In addition to the products shown on the other pages, we manufacture the Type CL-6 Loading Transformer. This product is used to generate up to 1,000 Amperes at 5 Volts from a 120 or 240 Volt input. Uses include generating current for testing current transformers or circuit breakers. More than one CL-6 can be placed in parallel or series to generate more current or the same current at a higher voltage. Fascinating, isn't it?


Click Here to see Descriptive Brochure in PDF

Picture of CL-6

Model 4E2-1 (BART) Tester

The Model 4E2-1 Tester is a voltage indicating safety device used by mass transit districts to detect the presence of voltage between the electrified third rail and the ground rail. This device may also be referred to by the name "BART Tester," as it was originally designed for the San Francisco Bay Area Rapid Transit System. It is designed for use over a wide range of AC or DC voltage up to 1500 Volts.

4E2-1 TesterObviously, a device of this type must be highly reliable and easy to use. The 4E2-1 is just such a device. All internal connections are soldered. Two, redundant, neon indicators are used to minimize the chances of an incorrect indication. These indicators are mounted in specially shielded cavities within the instrument housing so that the neon glow indication can be unmistakably seen even under the most adverse conditions of bright, direct sunlight on the instrument. Another safety feature is the limiting of current through the test circuit to less than 3 milliamperes at 1500 Volts.

The prod handle and the tester housing, with rubber hand guard, are made of moisture- and oil-resistant laminated phenolic. There are no exposed metal parts other than the two prod tips. The tester has ample "reach" as it can span a distance of four feet.

As stated above, this device was first designed for use on the Bay Area Rapid Transit (BART) system in the San Francisco area. Through word of mouth it has been adopted by rapid transit districts around the country including WMATA in Washington, D.C. and MARTA in Atlanta, Georgia. A very important product -- if your job includes potential contact with a high-voltage third rail!

  Click Here to see Descriptive Brochure in PDF

  Click Here to see 4E2-1 Instructions in PDF




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