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Meet the new Fluke 28 II Ex Multimeter: Intrinsically safe. intrinsically Fluke.

December 2012

Anyone who troubleshoots or maintains equipment in petrochemical or pharmaceutical facilities, where flammable gases, vapors, and dust are a daily reality, knows well the meaning of challenging. Before you even enter the area you have to suit up in full personal protective equipments (PPE). Then, you have to make sure that any tool you carry into that environment is certified as intrinsically safe (IS). Even if you’re only passing through a hazardous zone, any tool you carry (even with the power off) must comply with stringent IS standards to ensure that it doesn’t emit static electricity or heat to ignite the gas, vapors, or dust that are frequently present. An IS tool is typically designed with a conductive outside surface so that it doesn’t generate a static charge.

However, if you also service equipment outside of a hazardous zone, you may need a different set of tools. Some IS tools can’t handle the high voltages present outside hazardous areas. So if you go back and forth between hazardous and non-hazardous environments, you have to constantly switch from one set of tools to another.

At Fluke, we think that’s a lot of hassle you don’t need. We design our IS-rated tools to provide you with the safeguards you need to work in potentially explosive areas along with the testing and troubleshooting accuracy, reliability, and power you need to work outside Ex zones.

Twice the value

Our latest example of combining IS certification with Fluke’s well known intrinsically accurate and reliable performance is the new Fluke 28 II Ex Intrinsically Safe True RMS Digital Multimeter (DMM). As the “Ex” in its name implies, the Fluke 28 II Ex carries “Ex” certifications from the world’s leading certification bodies including ATEX, IEC Ex, NEC500/505, and GOST. You can use it in Class 1, Div. 1 - Zone 1 and 2 (gas) Class 2, Div. 1 or Class III - Zone 21 (dust) areas.

But a lot of people who work in areas that require IS test tools also work in high energy applications with normal electrical workloads that don’t require IS-certified tools. The 28 II Ex has you covered there, too. It meets IEC Overvoltage Electrical Safety Standard No. 61010-1:2001 to withstand hazardous spikes (up to 8,000 V) caused by load switching or faults on industrial circuits. So you can use it to also can make the high energy measurements that aren’t an issue inside an Ex classified zone. That means there’s no need to carry different meters for different areas, or to worry about crossing through an Ex-required zone with a non-Ex rated instrument. With a totally sealed IP 67-rated case, the Fluke 28 II Ex offers complete protection against water and dust. Plus, it is drop-proof (up to ten feet or three meters, with holster).

Full featured digital multimeter performance

Beyond all the intrinsically safe features, the Fluke 28 II Ex (which replaces the 87V Ex) offers all the capabilities and accuracy you’d expect from a Fluke DMM, including:

  • 4 1/2 digit mode for precise measurements (20,000 counts)
  • True RMS AC voltage and current for accurate measurement on nonlinear signals
  • Measurements up to 1000 V and 10 A AC and DC
  • Low pass filter to ensure accurate voltage and frequency measurements on variable speed motor drives (VSDs)
  • Frequency to 200 kHz and % duty cycle to help you diagnose VSDs and switching power supplies
  • Resistance, continuity, and diode test
  • 10,000 μF capacitance range for components and motor caps
  • A built in thermometer to measure temperature from -200°C to +1090°C (-328°F to +1994°F)
  • Conductance measurements for high resistance or leakage tests
  • Min/Max/Avg and Peak capture to automatically record transients and variations
  • Relative mode to remove test lead interference on resistance measurements
  • Auto and manual ranging for maximum flexibility
  • Input Alert protects you by chirping and flashing “Lead” when leads are plugged into the wrong inputs

Easy reading

Often hazardous areas are poorly lit. Carrying a flashlight along with a meter is cumbersome and the flashlight has to be IS certified as well. With the Fluke 28 II Ex you’ll be able to see measurement results more easily even in difficult conditions. Large display digits along with a two-level, bright white backlight, and backlit keypad buttons make it easier to see the results even in dim light and looking through a PPE visor.

Add the optional magnetic hanger and you can set up the meter for easy viewing and leave your hands free for other tasks. The 28 II Ex comes with Fluke TL175 TwistGuard™ test leads, AC72 alligator clips, a reversible red holster, and a 9V battery. The battery typically delivers 400 hours of use without the backlight on. The separate battery compartment makes it easy to swap out batteries or fuses in the field without jeopardizing the DMM’s IS rating or calibration.

The Fluke 28 II Ex Intrinsically Safe True-rms Digital Multimeter »