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4.1.1 Safety guidelines for hazardous locations
Warning: Explosion hazard. Batteries must only be changed in an area free of ignitible
concentrations.
Warning: Explosion hazard. Do not connect or disconnect when energized.
Warning: Explosion hazard. Do not disconnect while the circuit is live or unless the area is free of
ignitible concentrations.
Intrinsic safety
• Batteries must only be changed in an area free of ignitible concentrations.
• Only use batteries from Hach, LXZ449.99.00003.
• To reduce the risk of explosion, only install new batteries.
4.1.2 Hazardous location installation requirements
Installation of this equipment must obey local electrical code requirements as shown in the
hazardous location control drawings. Installation is subject to final approval by the authority that has
jurisdiction.
Specific conditions of use:
• It is end user's responsibility to select proper external antenna with an ingress protection rating of
at minimum IP54 according to IEC60529.
• Inductance and capacitance values specified for connection Power/4-20mA and RS232 have not
been assessed for simultaneous combination. Care shall be taken to ensure that the combination
of resistive, inductive and capacitive energies cannot result in an incendive spark. Refer to IEC
60079-25 for de-rating instructions.
4.1.3 Hazardous location control drawings
Explosion hazard. Never connect items to the CAx440EX field transmitter that are not specified on
the control drawing. Do not connect or disconnect any equipment unless power has been switched
off or the area is known to be non-hazardous.
Follow the control drawing provided and all codes and regulations for connection to the CAx440EX
field transmitter in the hazardous location. Refer to
on page 9 for the control drawing.
4.2 Installation guidelines
• Keep the field transmitter away from direct sunlight, heat sources, corrosive chemicals or gases
(all but H
S), mechanical impacts, abrasive materials, vibrations, shocks, dust and radioactive
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emissions.
• Do not use the field transmitter outside the specified electrical, mechanical, and thermal
parameters, or outside the measurement range. Refer to Specifications in the field transmitter user
instructions.
4.3 Install the sensor
Gas exposure hazard. Hydrogen sulfide is a highly toxic gas. Put on the personal protective
equipment identified in the safety data sheet (MSDS/SDS). Refer to the current safety data sheets
(MSDS/SDS) for safety protocols.
Refer to the GS1440, GS2440EX H
8 English
W A R N I N G
W A R N I N G
D A N G E R
Approved CAx440EX installation drawing
D A N G E R
S Sensor User Manual.
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