Kobold DON-05Bx, Руководство по эксплуатации, Страница: 10 / 55

DON
page 10 DON K18/0418
7. Electrical Connection
7.1 Connecting Cable
Proper shielded instrument cable is highly recommended. Low capacitance
twisted pair 7 x 0.3 mm (0.5 mm²) for use with the DON and any remote receiving
instrumentation. Typical cable would be Belden® 9363 or similar. Connect the
cable shield to DC common or designated grounding terminal at the receiving
instrument. Remember to only connect the end of the cable shielding at the
receiving instrument (not the DON) to ensure proper interference protection.
Please be sure not to run the connecting cable within a common conduit or in
close proximity to conduit with high inductive loads or power sources. This could
result in noise or inducted errors to the output signal or result in damage to the
electronic components. Always run the instrument cables in a separate conduit or
within a common conduit with other low power cables. Max cable length should
be limited to 3280 ft (1000 m).
7.2 Hazardous area wiring
The instrument can only be operated in the ATEX area as “Simple Apparatus” in
accordance with ATEX Article 1 §2 and 3 with the “Reed contact” (R0) option and
without ATEX labelling. For this purpose, intrinsically safe cabling must be laid
between the instrument, the hazardous area and an approved isolation switching
unit outside the hazardous area. (See section 17 Manufacturers declaration –
Switches for use in Explosive Atmospheres)
Alternatively, the device can be operated using option E1 to E5 with
Ex ia IIC T4 Gb approval [see separate operating instructions] or with explosion-
protected housing (Exd) option RE, BE, GE, KE, LE, HE or DE. Only Exd-certified
cable conduits and cable glands with corresponding temperature limits may be
used. Hall-effect sensor output is not possible if the DON flowmeter is operated in
an ATEX zone as simple apparatus or using the E1/E3 option.
When operating the electronic options LE, BE, GE, RE, HE and DE, suitable
operating materials must be used to ensure that the maximum operating
voltage of 28 V
DC
and the maximum operating current of 200 mA are not
exceeded.
The wiring methods used must be in accordance with the applicable rules,
provisions and requirements at the location where the device is installed. The
measuring devices may only be connected by qualified personnel who are
familiar with the protection classes, provisions and specifications for the device in
areas at risk of explosion.