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SEBU9068-03
Caution should be used when dispensing DEF near
an engine that has recently been running. Spilling
DEF onto hot components may cause the release of
ammonia vapors. Do not breathe ammonia vapors.
Do not clean up any spills with bleach.
Filling the DEF Tank
The fill cap on the DEF tank must be colored blue.
The DEF level is important, allowing the DEF tank to
run dry or operate at a low level can affect the engine
operation. Because of the corrosive nature of DEF,
the correct materials must be used when filling a DEF
tank.
DEF Quality
The quality of DEF can be measured by using a
refractometer. The DEF must comply with ISO
standard 22241-1 with the urea solution of 32.5
percent. Perkins offer a T400195 Refractometer for
checking the concentration of the DEF.
Cleanliness
Contaminants can degrade the quality and life of
DEF. Filtering DEF is recommended when dispensed
into the DEF tank. Filters should be compatible with
DEF and should be used exclusively with DEF.
Check with the filter supplier to confirm compatibility
with DEF before using. Mesh-type filters using
compatible metals, such as stainless steel, are
recommended. Paper (cellulose) media and some
synthetic filter media are not recommended because
of degradation during use.
Care should be taken when dispensing DEF. Spills
should be cleaned immediately. Machine or engine
surfaces should be wiped clean and rinsed with
water. Caution should be used when dispensing DEF
near an engine that has recently been running.
Spilling DEF onto hot components will cause harmful
vapors.
Storage
Do not store DEF in direct sunlight.
Table 22
Storage Temperature
Below 25° C (77° F)
25° C (77° F) to 30° C (86° F)
30° C (86° F) to 35° C (95° F)
Above 35° C (95° F)
Perkins recommend that all DEF taken from storage
should be checked to ensure that the DEF meets ISO
standard 22241-1.
Expected DEF Life
18 months
12 months
6 months
test quality before use
Materials compatibility
DEF is corrosive. Due to the corrosion caused, DEF
must be stored in tanks constructed of approved
materials. Recommended storage materials:
Stainless Steels:
• 304 (S30400)
• 304L (S30403)
• 316 (S31600)
• 316L (S31603)
Alloys and metals:
• Chromium Nickel (CrNi)
• Chromium Nickel Molybdenum (CrNiMo)
• Titanium
Non-metallic materials:
• Polyethylene
• Polypropylene
• Polyisobutylene
• Teflon (PFA)
• Polyfluoroethylene (PFE)
• Polyvinylidene fluoride (PVDF)
• Polytetrafluoroethylene (PTFE)
Materials NOT compatible with DEF solutions include
Aluminum, Magnesium, Zinc, Nickel coatings, Silver,
and Carbon steel and Solders containing any of the
above. Unexpected reactions may occur if DEF
solutions come in contact with any non-compatible
material or unknown materials.
77
Maintenance Section
Diesel Exhaust Fluid (DEF)
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