Tecnetics Industries Tecweigh 20, Operation Manual

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1.05 Hazardous Environments
WARNING! The standard scale is not “explosion-proof”. The standard scale must not be
operated in an environment where conditions exist that could cause an explosion of dust or gas.
Specially built explosion proof scales, signal conditioner enclosures, and speed sensors are
available from
Tecnetics for hazardous environments.
1.06 Scale Over-Loading
WARNING! Excessive loading on the scale could result in damage to the scale, conveyor, or
cause injury to personnel. Information that applies to your specific application is available in
Section 12 of this manual. An increase in maximum rate and/or a reduction of belt speed could
result in overloading the scale. Additionally, increasing the idler center-to-center distance (refer
to Section 7.02.5), which increases the loading on the weigh idler, can also result in overloading
the scale.
1.07 Environment
The equipment is designed to be operated in wet or dry environments, within a temperature range
of 32-104 degrees Fahrenheit (0-40 degrees Celsius), and a relative humidity less than 80%.
Although the equipment will operate outside this temperature range, the accuracy of the
equipment might be affected. If the equipment is to be stored for an extended period of time,
keep it in a cool dry area and do not expose the shipping crate or pallet to the weather unless care
is taken to protect it from rain exposure.
1.08 Printed Circuit Board (PCB) Precautions
Disconnect and lock out all power to the scale before servicing. When handling PCBs, always
use a commercially available grounding wrist strap to prevent electrostatic discharge, which can
destroy electronic components. Store unused PCBs in electrostatic protection bags made for that
purpose.
1.09 Welding Precautions
Do not do electrical welding on or near the scale carriage, electrical enclosures, load cells or
LVDT’s, or signal wiring. Electrical current passing through the PCBs will destroy them, as can
electromagnetic radiation. If welding near the scale is absolutely necessary, place the ground
clamp as close to the welding area as possible.