Honeywell XNX-AM Series, Technical Manual

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XNX Universal Transmitter
Safety and Information 8
Hazardous Location Installation Requirements
• Read and understand this manual prior to installation and use.
• Use only certified cable glands for installation.
• Shielded armored cable is required for CE compliance.
• To reduce the risk of ignition in hazardous atmospheres, conduit runs must have a
pour gland installed within 18 inches (45 cm) of the enclosure.
• All ¾ inch NPT conduit, stopping plugs, and adapters must be installed with 5¼
threads (minimum) engaged to maintain the explosion-proof rating.
• The XNX cover assembly must be fully seated to the enclosure (7 threads
minimum) to maintain the explosion-proof rating.
• Use only the supplied stopping plugs (Honeywell part number 1226-0258) with the
XNX Universal Transmitter.
• For units fitted with the optional relay module: relay contact ratings are 250 VAC
5A, 24 VDC 5A resistive loads only.
• Use copper conductors only. Tighten terminal block screws to 4.5 lb/in (max).
• For XNX-UT**-***** transmitters, refer to XNX control drawing 1226E0402.
Special Conditions for Safe Use
• The following applies to the HART Barrier intrinsically safe circuits: For installations
in which both the Ci and Li of the intrinsically safe apparatus exceed 1% of the Co
and Lo parameters of the associated apparatus (excluding the cable), then 50% of
Co and Lo parameters are applicable and shall not be exceeded, i.e., the Ci of the
device plus the C of the cable must be less than or equal to 50% of the Co of the
associated apparatus, and the Li of the device plus the L of the cable must be less
than or equal to 50% of the Lo of the associated apparatus.
• For circuits connected to the EC barrier in which the capacitance and inductance
exceed 1% of the permitted values, the maximum permitted capacitance is limited
to 600 nF for group IIC and 1uF for group IIIC.
• The connection to the HART circuit shall be rated a minimum of IP 6X.
• Delays resulting from transmission errors between sensor and transmitter extend
response times T90 by more than one-third. The period until fault indication is 10
seconds.
• The HART interface is subject of this EC-type examination certificate only for the
purpose of configuration and maintenance. The options “Modbus interface” and
“FOUNDATION Fieldbus interface” are not subject of this EC-type examination
certificate.
• Long-term exposure (>20 minutes) to concentrations exceeding the full-scale
range of the H
2
S sensor Type 2 can cause it to lose sensitivity. The measured
value may then decrease even though high levels of toxic gas are still present. If
such conditions can occur, set the control unit to latch at overrange. In standalone
operation, set alarms to latching. When resetting the overrange or alarm, verify the
correct operation of the transmitter. Before re-calibrating the transmitter, verify the
absence of gas.
• The flameproof joints are not intended to be repaired.
Cautions
Caution messages address situaltions that could result in damage to the
transmitter or sensors.
CAUTION
!
Notes
Notes relate helpful information.
NOTE
!
Waste Electrical and Electronic Equipment (WEEE) Directive
This symbol indicates that the product must NOT be disposed of as general
industrial or domestic waste. This product should be disposed of through
suitable WEEE disposal facilities. For more information about disposal of this
product, contact your local authority, distributor or the manufacturer.