MN301535 Rev A
5
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Safety Precautions
Step Three
About This Manual:
PLEASE READ THE ENTIRE MANUAL PRIOR TO
INSTALLING OR USING THIS
PRODUCT. This manual includes information on three different models of Remote Isolation Relay
Controllers from FLOWLINE: LC90 and LC92 series. Many aspects of installation and use are similar
between the three models. Where they differ, the manual will note it. Please refer to the part number on
the controller you have purchased as you read.
User’s Responsibility for Safety:
FLOWLINE manufactures several controller models, with different
mounting and switching configurations. It is the user’s responsibility to select a controller model that is
appropriate for the application, install it properly, perform tests of the installed system, and maintain all
components.
Special Precaution for Intrinsically Safe Installation:
DC powered sensors should not be used with
explosive or flammable liquids unless powered by an intrinsically safe controller such as the LC90 series.
"Intrinsically safe" means that the LC90 series controller has been specifically designed so that under
normal conditions the sensor input terminals cannot transmit unsafe voltages that could cause sensor
failure and spark an explosion in the presence of a specific atmospheric mixture of hazardous vapors. Only
the sensor section of the LC90 is intrinsically safe. The controller itself cannot be mounted in a hazardous
or explosive area, and the other circuit sections (AC power and relay output) are not designed to connect to
hazardous areas.
Follow Intrinsically Safe Installation Procedures:
The LC90 must be installed in compliance with all
local and national codes, following the latest National Electric Code (NEC) guidelines, by licensed
personnel who have experience in intrinsically safe installations. For example, the sensor cable(s) must
pass through a conduit vapor seal fitting in order to maintain the barrier between the hazardous and
nonhazardous area. In addition, the sensor cable(s) may not travel through any conduit or junction box that
is shared with non-intrinsically safe cables. For further details, consult the NEC.
Maintain the LC90 in Intrinsically Safe Condition:
Modification to the LC90 will void the warranty and
may compromise the intrinsically safe design. Unauthorized parts or repairs will also void the warranty and
the intrinsically safe condition of the LC90.
IMPORTANT
Do not connect any other devices (such as a data logger or other measurement device) to a
sensor terminal, unless the measurement probe is rated intrinsically safe also. Improper
installation, modification, or use of the LC90 series in an installation requiring intrinsically safe
equipment may cause property damage, bodily injury or death. FLOWLINE, Inc. will not be
responsible for any liability claims due to improper installation, modification, repair or use of the
LC90 series by other parties.