NIVELCO THERMOCONT TT Series Installation And Programming Manual

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NIVELCO THERMOCONT TT Series Installation And Programming Manual Manual pdf 10 page image

BKI 04 ATEX 113X♦ tbj5242a0600p_01.doc ♦ 10 / 164.1 WIRING• Transmitters are used in 2-wire systems with power supply of 10 … 36 VDC. Resistance of the units in the loop depends on the voltage of thepower supply.• For wiring shielded cable suggested in the Technical Data should be used.• After removal of the housing cover and taking out the display module (ifany), the screw terminals can be accessed. Cover of the flame proofhousing can be removed after unhooking the clamp.• The unit should be grounded by the inner or outer grounding screw.• Loop should be connected to terminal 3 (+) and 4 (-). Other terminals arefor internal connection of the Pt sensor.• The Pt100 sensor for types TW-- should be wired as shown ondrawing at the right.• Switch on the unit and make necessary programming.• After wiring and programming ensure proper sealing and closing of thecover (and fastening of the clamp with the flame proof models).+–MainsExEx56 4 3 2 1The screening isto be grounded atone point only+– 56 4 3 2 1Pt 100The Pt100 sensor for typesTW-00- should be wiredas shown on drawing! The unit may be damaged by electrostatic discharge (EDS) via its terminal, thus apply the precautions commonly used to avoid electrostaticdischarge e.g. by touching a properly grounded point before removing the cover of the enclosure.4.2 S AFETY REGULATIONS FOR THE E X APPROVED UNITS• Intrinsically safe units should be powered by duty certified intrinsically safe [EEx ia IIB] or [EEx ia IIC] device with features as per technical data above.• Plastic coated probes may be charged electrostatically therefore such units should only be used for measurement of conductive medium and its specificresistance must not exceed 104 Ωm, even under the most unfavourable conditions and at the most unfavourable place.• The Ex device should be grounded by its grounding screw.