Gasboy Atlas Start-up - Manual (Page 14)

Read This First DEF Special Considerations
Page 1-6 MDE-4334D Atlas™ Start-up and Service Manual · July 2013
DEF Special Considerations
Several important considerations exist for DEF. The service technician must be aware of the
following when servicing or supporting DEF units:
• DEF is non-flammable or explosive.
• The fluid is slightly corrosive and can damage tools or equipment that are not stainless
steel or plastic. It can also damage the electronic components.
• DEF spills can be cleaned with water and a damp rag. Failure to thoroughly clean spills
may result in corrosive damage to components or metals.
• DEF can cause serious eye injury if sprayed in the eyes or may affect those with sensitive
skin. Wear protective gloves and eye protection, as required. Flush eyes immediately with
water, if sprayed.
• DEF freezes at approximately 11.3 °F (-11.5 °C). If it freezes in hydraulic components, it
may permanently damage the meters, valves, breakaways, and possibly other devices. It is
extremely important that DEF fluid in the dispenser does not fall below that temperature.
• DEF must not be contaminated with diesel fuel, contaminants or other fluids or materials.
Such contamination can cause serious damage to vehicle’s catalytic converters.
• A dedicated stainless steel calibration prover (with SS valve, if equipped) must be used
with DEF to avoid contamination of the product with diesel fuel or gasoline. No
exceptions are allowed.
• DEF can be returned to the storage tank only if it is not contaminated. Contaminated DEF
must be disposed of in an environmentally safe manner. Do not dump DEF in storm
sewers or any location, where the fluid or its constituents may enter a waterway.
• DEF must never be introduced into diesel fuel tanks or serious damage to the vehicle’s
engine may occur. Only dispense DEF into vehicle tanks dedicated for DEF.
• DEF when stored at temperatures above 100 °F (37.7 °C) may break down into ammonia
gas over a time. Take care when opening the cabinets, tank vaults, or other areas, where
DEF may have leaked or been spilt to avoid inhaling any toxic ammonia vapors.
• When exposed to air, the water in DEF will evaporate and result in development of urea
crystals. Crystals may be fine and sharp. They will dissolve in water.
• DEF is much heavier than fuels such as gasoline. Be careful to avoid injury when lifting
heavier Prover Cans and so on, by following proper safe lifting techniques.