Case 521F, Руководство по обслуживанию, Страница: 22 / 51

1002-7
84581916A Issued 3-12 Printed in E.C.
What is selective Catalytic Reduction (SCR)
The main components of the SCR system include the
SCR catalyst, the Diesel Exhaust Fluid (DEF)/
AdBlue® injection unit, the DEF/AdBlue® tank, and
the DEF/AdBlue® dosing control unit.
How does Selective Catalytic Reduction
(SCR) work?
During combustion, harmful Nitrogen Oxide (NOx)
molecules are formed in the exhaust. By injecting a
DEF/AdBlue® solution into the exhaust prior to a
catalyst, the NOx can be converted to harmless
elemental Nitrogen and water. This happens when
the NOx molecules react inside the catalyst with the
heat generated by the engine and the ammonia in
the DEF/AdBlue® solution.
During cold engine operation at low engine coolant
and ambient air temperatures, water vapor will be
visible from the exhaust when the engine operates.
This water vapor will resemble steam or light white
smoke and will dissipate as the engine and machine
components warm and is considered normal.
NOTE:
After engine shutdown, the SCR system will
perform a purge cycle, which permits the supply
module to continue to run for up to 70 seconds. This
is to be considered normal and requires no action
from the operator.
What is Diesel Exhaust Fluid (DEF)/AdBlue®?
DEF/AdBlue® is a non-toxic aqueous urea solution (
32.5 %) with a slight ammonia odor used to
chemically reduce NOx emissions from heavy-duty
diesel powered vehicles.
DEF/AdBlue® is neither explosive nor harmful to the
environment and is classified under the minimum-risk
category of transportable fluids. DEF/AdBlue®
quality is defined by ISO 22241-1. The American
Petroleum Institute (API® ) h as a volunta ry
certification program for DEF/AdBlue®. To ensure
DEF/ AdBlue® satisfies the requirements of ISO
22241. DEF/AdBlue®. API Diesel Exhaust Fluid
Certification Mark is a registered trademark of API in
the United States and or other countries.
Storage, handling, and transport
IMPORTANT:
Storage temperatures above 30 °C
(86 °F) greatly reduce the shelf life of DEF/AdBlue®.
DEF/AdBlue® has a typical shelf life of 6-12 months.
Refer to the SHELF LIFE table below. In order for
DEF/AdBlue® to remain in a usable condition,
storage requirements need to be met.
●
Store between -11 °C (12 °F) and 30 °C (86 °F).
●
Use only an approved DEF/AdBlue® container.
●
Keep container tightly closed.
●
Keep container in a cool, well-ventilated area.
●
Keep away from heat and direct sunlight.
Thawing
●
The machine is equipped with an internal tank
heater to thaw frozen DEF/AdBlue®. The machine
will still function until the DEF/AdBlue® begins to
flow. The SCR system will then function normally.
●
Do not heat DEF/AdBlue® for long periods of time
at temperatures above 30 °C (86 °F). This causes
the solution to decompose, which very slowly
decreases the expected shelf life.
IMPORTANT:
Do not use an anti-gelling or freeze
point improver in your DEF/AdBlue®. The 32.5 %
solution is specifically designed to provide the
optimum NOx reduction properties. Any further
blending or adjusting of the DEF/AdBlue® mixture
will lessen its ability to perform correctly and may
cause damage to the SCR components.
Handling and supply of additives, if any
●
Personal Protective Equipment (PPE) is not
required under normal conditions. If splashing is
likely, wear eye protection. For prolonged or
repeated contact, impervious gloves are
recommended. Follow the precautions listed in the
SAFETY INFORMATION chapter when handling
any service fluid.
●
No additives are required.
IMPORTANT:
Contaminated DEF/AdBlue® can
affect the performance of your machine. Follow all
instructions in this manual when handling
DEF/AdBlue®.
Shelf life
Constant ambient storage temperature and
minimum shelf life
Less than or equal to 10 °C (50 °F) 36 months
Less than or equal to 25 °C (77 °F) ¹ 18 months
Less than or equal to 30 °C (86 °F) 12 months
Less than or equal to 35 °C (95 °F) 6 months
Greater than 35 °C (95 °F) -²
¹ To prevent decomposition of DEF/AdBlue®,
prolonged transportation or storage above 25 °C (77
°F) should be avoided.
² Significant loss of shelf life: check every batch
before use. See your New Holland dealer for more
information on testing.