AccuLoad IV Installation & Maintenance Manual
Introduction 11
1.2 Warnings and Precautions
Before you begin installing the AccuLoad, please read all of the following warnings and cautions to the
reduce the risk of injury, equipment damage, or malfunction.
1.2.1 Hazardous Voltages
Hazardous voltages are involved in the installation and maintenance of the AccuLoad. Only qualified
individuals should perform this installation.
1.2.2 Hazardous Locations
The ST and QT models are approved for use in an explosive environment (Class I, Division 1, Groups C
and D and Zone 1 Ex d ia, IIB Gb), but specific installation methods are required to produce a
comprehensive explosion-proof system. This manual only provides guidance for the installation of the
AccuLoad. In general, keeping the front cover bolted closed in accordance with the instructions in Section
5: Closing and Sealing the Enclosure is the key to maintaining explosion protection.
1.2.3 Electrostatic Discharge Precautions
The electronic components in the AccuLoad are susceptible to damage by electrostatic discharge (ESD).
To minimize the risk of damage, the following precautions should be followed:
• Before touching a circuit board with hands or tools, personnel and tools should be grounded using
a wrist strap.
• Avoid touching components or traces on the circuit boards and handle by the edges or mounting holes.
• Keep circuit boards in static-control packaging (such as static-shielding bags) when not installed.
• Protect against ESD in workspaces when handling circuit boards.
1.2.3.1 Electrostatic Discharge Precautions in Hazardous Locations
Note the following additional precautions when operating the AccuLoad in hazardous locations:
• The touch screen features a plastic screen protector (installed at the factory) with a surface area
exceeding the area specified in IEC/EN 60079-0, and as such requires the following statement:
WARNING: The AccuLoad should never be relied upon to act as the primary safety system control for
the flow valve and pump controls (such as emergency stop, overfill, and ground protection). These
should always be handled by separate systems specifically designed for that application; for example,
safety systems specifically to meet safety integrity level (SIL) requirements. Any power control circuits
from these external systems should be wired in series ahead of the AccuLoad to remove power to
ancillary devices.
Any modification to the housing invalidates the hazardous location rating of the AccuLoad. For example:
• Do not replace the bolts in the front cover except with those supplied by the manufacturer. Using
unapproved bolts invalidates the explosion-proof rating of the enclosure.
• Do not drill or machine the housing.
• Do not attempt to replace the touch screen or glass except as part of a factory-supplied assembly.
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