Kurz Instruments Inc. December 13, 2007
360210-AH Rev.A 504/534FTB Installation AH - 15
so the lead length compensation can work properly. Without this, the Factory calibration
and temperature compensation will not hold in the field. If the individual wires do not
meet the matching specification, their length must be trimmed or extended until they
match. The terminal strip for the sensor wire will accept up to 12 AWG wire (2.05 mm)
which is good for 630 feet (192 m) between the sensor and electronics. However, the
electronics terminal block TB1 is rated for 14 AWG (1.63 mm) max wire size.
To maintain the CE compliance of the product in the TS configuration, one must maintain
a good shield around the 5 wires. This can be done with rigid conduit, EMT or a braided
shielded multi-conductor cable between the sensor junction box and the sensor
electronics enclosures. Conduit seals directly to the enclosures are still needed to meet
the explosion-proof ratings. Peripherally bonded shielded cable glands work well but a
simple cable gland and shield pigtail ground connection is sufficient. Hawke America
(281 445 7400, www.ehawke.com ), makes a whole line of cable glands for shielded
cable. Their Model 501 universal is one of many and has Exd safety ratings too, see
installation info also. Some of these sizes and cable are also available as accessories
from Kurz. See section above with more recommend wiring methods for the 5-wire
sensor connections.
Not recommend for CE compliance on the 5-wire sensor connections of the TS
configuration:
Type
Reason not to use it.
Unshielded
twisted Pair, UTP
No shielding.
Armor Cable
Spiral wrap armor wires are not an EMI
shield. Looks like an inductor at RF
frequencies.
Flex Conduit
Spiral wrap shell is not an EMI shield.
Liquid Tight
Conduit
Better shield than flex conduit but will not
hold up well over time due to oxidation of
the metal wrap joints that degrade the EMI
shield.
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