1071Ex  Intrinsically-Safe Ultrasonic Wall Thickness Gauge With the 1071-Ex measurements of wall thicknesses can be made quickly and accurately in the range of 0,7 to 400 mm. There are three different probe availables to cover this wide measuring range, each of which can be easily and conveniently changed inside the hazardous area. standard probe : 1.5 to 250 mm mini probe:  0.7 to 25 mm low frequency probe :  0.7 to 25 mm Due to its compact size and operating time of over 200 hours this easy to use instrument is essential whenever the continuous supervision of minimum wall thicknesses is required. For example, it is possible to check the thickness of protective coats or for the erosion of pipe or tank walls even while the plant is operating. By using the limit value guides, minimum and maximum values can be set and are registered by an audible signal. The calibration functionality of the instrument means that adjustmentscan be made to compensate for the type of material being measured, this is done by one of two ways: - entering the sound velocity of the corresponding material - measuring a material with known thickness and adjusting the instrument to that reference These adjusted parameters then stay in the memory even when switching off the instrument. FEATURES limit value guides and monitoring adjustable sensitivity easy to use energy saving mode accuracy : ± 0.05 mm Class I Zone 0 AEx ia II C T4 I.S. Class I Division 1 Group A-D T4 COMPLETE KIT Wall thickness measuring gauge 1071-Ex Incl. primary cells, case, user manual 100 ml of couplant ACCESSORIES Optional available : standard probe mini probe low frequency probe 500 ml of couplant handle-collar vulcollan films (10 pcs)