National Instruments 9756 User manual

USER MANUAL
NI 9756
NI Powertrain Controls USB NOx Sensor Module Kit
Contents
Introduction .............................................................................................................................. 1
System Diagram ....................................................................................................................... 2
Hardware .................................................................................................................................. 2
Powering the Hardware ............................................................................................................ 3
Wiring Harness ......................................................................................................................... 5
Introduction
The National Instruments 9756 USB NOx Sensor Module Kit interfaces with NOxand O2
exhaust gas sensors.
Features
• Configurable for one or two channels
• Measures NOx(ppm) and O2(%) concentrations
• Sensor controller supply voltage of 12 V to 16 V (24 V version available)
• Reverse battery protection on sensor controller module

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• Sensor controller harness
• Stand-alone executable that can run without a LabVIEW license
• Windows-based LabVIEW VIs
System Diagram
Figure 1. NI 9756 System
Hardware
The NI 9756 includes the following hardware:
• Continental UniNOx Smart NOx Sensor with an integrated sensor controller module
• Sensor bung
• Wiring harness
• NI USB-8473 USB High-Speed CAN module
The wiring harness in the NI 9756 connects to the NOx Sensor Control Module and splits into
two cables for the NI USB-8473 module and an external power supply. The first cable connects
to the NI USB-8473 with a female DB-9 connector. A terminating resistor of approximately
120 Ωis located inside this cable near the NOx Sensor Control Module and between the CAN
High and CAN Low wires. The second cable provides three non-terminated leads for connecting
to a power supply, which requires two leads, and for address selection of the NOx sensor module,
which requires one lead.
Refer to the NI USB-8473 CAN Hardware and Software Manual for more information about
cabling requirements.
Note You must use the sensor included in the NI 9756 kit. NI does not support other
sensors.
NI USB-8473
Sensor
Control Module(s)
Optional Second Sensor
DC Power
Supply 12V

NI 9756 User Manual |© National Instruments |3
Powering the Hardware
The NI 9756 requires power from a range of 12 V to 16 V with a continuous current of 1.5 A
and a peak current of 16 A. The maximum power requirement is 20 W, which typically occurs
when the heating element is being turned on from a cold state. If you are using two sensors,
double the capacity of the power supply.
Refer to the NI USB-8473 Hardware and Software Manual for more information on power
requirements.
Contact National Instruments for more information about sensor specifications.
NOx Sensor Light-Off Times
Conditions
Air T ......................................................... 25 ±5 °C
BattV......................................................... 14 V
Heater........................................................ ON
NOx .................................................................. <100 s
O2...................................................................... <80 s
NOx Sensor Preheating Function
When power is supplied to the sensor, the sensor enters preheating mode automatically until the
Sensor Enable Boolean is set to TRUE within the supporting software. The Sensor Enable
Boolean turns the internal sensor heater to its ON state. If the Sensor Enable Boolean is set to
FALSE, the sensor returns to preheating mode. The preheating mode protects the sensor from
mechanical cracks caused by water splash.
NOx Sensor Operating Temperature Ranges
Sensor Module Controller Temperature ........... -40 °C to 105 °C
(105 °C to 115 °C for a maximum of 10 minutes)
Storage temperature range ................................ -40 °C to 120 °C
Maximum storage time..................................... 2 years
Maximum exhaust gas temperature.................. 800 °C (950 °C for a maximum of 100 hours)
Maximum sensor hexagon
screw temperature............................................. 620 °C (650 °C for a maximum of 100 hours)
Maximum sensor grommet temperature........... 200 °C (230 °C for a maximum of 100 hours)
Preheating sensor temperature range................ 80 °C to 120 °C
Lifespan approved by life cycle pattern ........... 2,000 hours or 120 K miles

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NOx Sensor Electrical Characteristics
NOx Sensor Supply Voltage
Minimum supply voltage ..................................12 V
Maximum supply voltage .................................16 V
NOx Sensor Supply Current
Average supply current .....................................1.5A
Peak supply current at switch on ......................16 A
Supply Power
Maximum supply power ...................................20 W
NOx Sensor Miscellaneous
Thread torque ....................................................50 N · m (36.88 lb · ft)
Lubrication........................................................Anti-seize compound
Figure 2. Installation Position
Figure 3. Tilt Angle in Gas Flow Direction
0°
+80°
Exhaust Gas Pipe
To p
–80°
D/E
90°
–10° +10°

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376105C-01 Aug16
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NOx Sensor Controller Module Connector
Type of connector .............................................Hirschmann MLK 872-860-501
Number of pins .................................................5
Connector pin assignment
Pin 1 ..........................................................Battery [red]
Pin 2 ..........................................................Ground [black]
Pin 3 ..........................................................CAN Low [blue]
Pin 4 ..........................................................CAN High [orange]
Pin 5 ..........................................................Address Switch [purple]
Pulling Pin 5 to ground changes the CAN transmit ID of the Sensor Control Module so that
two NOx Sensor Control Modules can be added to the same network. Sensor Control Modules
with Pin 5 floating are Ch. 1 and Sensor Control Modules with Pin 5 grounded are Ch. 2.
Wiring Harness
Figure 4. 2-Sensor Harness
NI-CAN
Device
Sensor
Control Module
12 V DC
Power Supply
Sensor
Control Module
Sensor 1
Sensor 2
1. Batt
2. Gnd
3. CAN-Low
4. CAN-High
1. Batt
2. Gnd
3. CAN-Low
4. CAN-High
CAN-Low .2
CAN-High .7
CAN-Gnd .6
Batt .9
5. Add. Sw
Batt
Gnd
Add. Sw
• Each leg from the junction is4 ft
• Batt and Gnd wiresare 18 AWG, CAN wiresare 20 AWG
• 120 Ωresistorsacross CAN-Low and CAN-High near sensor 1 and 2
• NI-CAN devicesconnect to the harness through afemale DB-9 connector
• CAN-Ground isconnected to Ground near junction
• Add. Sw should be connected to ground at the power supply