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NI 9756 User Manual
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© National Instruments
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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
O
2
...................................................................... <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