Honeywell XNX, Technical Manual

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XNX Universal Transmitter
Introduction 7
• 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
fullscale range of the H2S sensor type 2 can cause it to lose sensitivity.
The measured value may 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 correct operation of the
transmitter.
Hazardous Location Installation Requirements
(UL/CSA)
• To reduce risk of ignition of hazardous atmospheres, conduit runs must
have a pour gland installed within 18 inches (457mm) of enclosure.
• All ¾ inch NPT conduit, stopping plugs and adapters must be installed
with 5¼ threads (minimum) engaged to maintain Explosion Proof rating.
• Stopping Plugs supplied (Honeywell Part Number 1226-0258) are
approved for use ONLY 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.
• Terminal block screws should be tightened to 4.5 lb/in (max).
• Reference XNX Control Drawing 1226E0402 or 1226E0454 for
additional information regarding IS function (Local HART and EC
Personality).
Hazardous Location Installation Requirements
(ATEX)
• Read and understand this manual prior to installation and use.
• Use only certified M25 cable glands for installation.
• Shielded armored cable is required for CE compliance.
• 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 exceeds 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, then the
maximum permitted capacitance is limited to 600nF for group IIC
and 1uF for group IIIC.
• The connection to the HART circuit shall be rated a minimum of IP
6X.
Cautions
Cautions: Identify hazardous or unsafe practices which could result in
damage to property or to the product.
Notes
Notes: Additional useful information.