Installation Manual

Electrical & Electronic Application And Installation Manual
Production Release Version 1.0
Page 112
designed to accommodate an M6 fixing and washer tightened to a torque of
11Nm +2/-1 tolerance.
9.3.3.2 Ammonia (NH3) Sensor Cable Routing & Support
As with the engine NOx sensor the cable routing and support is critical to the
correct operation of the component over the life of the machine. To ensure
component integrity the cable connection back to the sensing control unit
must adhere to the following installation criteria.
• The cable must be fitted with a correctly secured strain relief.
• The Harness should be routed such that the harness exits the grommet
/ seal at an angle of no more than 15° with respect to the angle of the
sensing element.
• Harness should be supported every 6 inches or less.
• Any bend radii must not exceed 20mm.
• Routing of the harness must such that risk of contact with hot
components is mitigated and the harness is not exposed to risks of
abrasion / damage by any other components.
The NH3 sensor comes supplied with a small section of corrugated tubing that
is connected to the back of the electrical connector and extends for 150mm
along the sensor cable as shown in figure 9.15 To ensure that the corrugated
tubing is not damaged during installation the bend radius of the cable in this
area must be >50mm and cable ties must not be used to secure the cable
along the length of the corrugated tube.
Figure 9.15 NH3 Sensor Cable Support
Temperature limits as defined in table 9.10 must be observed.
Installation Criteria
Max Temp Limits
Sensor to Controller Electrical Cable -40Deg to 200DegC
SEA Grommet (Rear of sensing element) -40Deg to 200DegC
SEA hex fitting -40Deg to 630DegC
Table 9.10 NH3 Sensing Unit Temperature Limits
Length of corrugated tubing extends for 150mm from the back of
the NH3 electrical connector.
• Tie wraps must to be used to secure the cable along the length
of the corrugated tube.
• Min bend radius of the corrugated tube is 50mm