®
Sure Cross Wireless Q45UA Ultrasonic Node
®
Exporting Sure Cross Radios. It is our intent to fully comply with all national and regional regulations regarding radio frequency emissions. Customers who want to re-export this product
to a country other than that to which it was sold must ensure the device is approved in the destination country. A list of approved countries appears in the Radio Certifications section of
the product manual. The Sure Cross wireless products were certified for use in these countries using the antenna that ships with the product. When using other antennas, verify you are
not exceeding the transmit power levels allowed by local governing agencies. Consult with Banner Engineering Corp. if the destination country is not on this list.
General Operation
For the first 15 minutes after power up, the Node samples the sensor every 0.25 seconds (fast sample mode). After 15 minutes, the
Node defaults to 5 minute sample intervals. Activate fast sample mode by single clicking the button (the amber LED is solid).
Storage Mode for the Q45
While in storage mode, the Q45's radio does not operate. The Q45 ships from the factory in storage mode to conserve the battery.
To wake the device, press and hold the button for five seconds. To put any Q45 into storage mode, press and hold the button for
five seconds. The Q45 is in storage mode when the LEDs stop blinking.
Principles of Operation
Ultrasonic sensors emit one or multiple pulses of ultrasonic energy, which travel through the air at the speed of sound. A portion of
this energy reflects off the target and travels back to the sensor. The sensor measures the total time required for the energy to
reach the target and return to the sensor. The distance to the object is then calculated using the following formula: D = ct ÷ 2
D = distance from the sensor to the target
c = speed of sound in air
t = transit time for the ultrasonic pulse
To improve accuracy, an ultrasonic sensor may average the results of several pulses before outputting a new value.
Temperature Effects
The speed of sound is dependent upon the composition, pressure and temperature of the gas in which it is traveling. For most
ultrasonic applications, the composition and pressure of the gas are relatively fixed, while the temperature may fluctuate.
In air, the speed of sound varies with temperature according to the following approximation:
In metric units:
In English units:
C
=
√
=
C
ft/s
√
49 460 + T
F
20 273 + T
m/s
C
Cm/s = speed of sound in meters per second
TC = temperature in °C
Cft/s = speed of sound in feet per second
TF = temperature in °F
Temperature Compensation
Changes in air temperature affect the speed of sound, which in turn affects the total time for the echo measured by the sensor. An
increase in air temperature shifts both sensing window limits closer to the sensor. Conversely, a decrease in air temperature shifts
both limits farther away from the sensor. This shift is approximately 3.5% of the limit distance for a 20° C change in temperature.
The Q45 series ultrasonic sensors are temperature compensated, to reduce sensor errors from temperature by about 90%.
Exposure to direct sunlight can affect the sensor’s ability to accurately compensate for changes in temperature.
Replacing the Batteries
To replace the lithium "AA" cell battery, follow these steps. As with all batteries, these are a fire, explosion, and severe burn hazard.
Do not burn or expose them to high temperatures. Do not recharge, crush, disassemble, or expose the contents to water. Properly
dispose of used batteries according to local regulations by taking it to a hazardous waste collection site, an e-waste disposal
center, or other facility qualified to accept lithium batteries.
1. Lift the plastic cover.
2. Slide the board containing the batteries out of the Q45 housing.
3. Remove the discharged batteries and replace with new batteries. Use two 3.6 V
AA lithium batteries, such as Xeno's XL-60F or equivalent.
4. Verify the battery’s positive and negative terminals align to the positive and
negative terminals of the battery holder mounted within the case. Caution: There
is a risk of explosion if the battery is replaced incorrectly.
5. Slide the board containing the new batteries back into the Q45 housing.
Replacement battery model number: BWA-BATT-006. For pricing and availability, contact
Banner Engineering.
2
www.bannerengineering.com - Tel: +1-763-544-3164
P/N 207212 Rev. B