How often should I recalibrate the sensor?
Apogee SB-100 barometric pressure sensors are not factory calibrated but come with a generic calibration. The sensors drift less than 1 % per year. If a new calibration is required a custom calibration can be derived by plotting pressure measurements from a reference barometric pressure sensor versus the measured voltage output from an SB-100, then fitting a linear equation to the data. The slope of the linear equation is the calibration factor and the intercept is the offset.
What is the output of the SB-100 sensor?
The output range is 0 to 5 V, which corresponds to 15 to 115 kPa.
What is the warmup time of the SB-100?
20 ms
Which color is the signal to wire up?
Black is the signal. It connects to a single-ended channel.
Green is the ground for signal output. It connects to an analog ground.
Red is the power input. It connects to 5 V.
How do I mount my SB-100 Barometric Pressure sensor?
SB-100 barometric pressure sensors are designed to be mounted inside the datalogger enclosure, where they are protected from the elements, specifically precipitation, condensation, and dynamic pressure caused by wind. The datalogger enclosure should not be air tight, as the pressure sensor must be exposed to an environment where the pressure varies with ambient pressure. As a result, vent holes in the enclosure are required and should be in the bottom of the enclosure to minimize the impact of dynamic pressure caused by wind.
How can I check my sensors functionality?
A quick and easy check of sensor functionality can be determined using a DC power supply and a voltmeter. Power the sensor with 5 V DC by connecting the positive voltage signal to the red wire from the sensor and the negative to the green wire from the sensor. Use the voltmeter to measure across the black wire (output signal) and green wire. The sensor should read approximately 4100 mV at sea level, with the voltage output decreasing by approximately 50 mV per 100 meters above sea level.
What measurement devices are compatible with the SB-100?
A compatible measurement device should have resolution of at least 0.459 mV (0.01 kPa). Compatible measurement device should also have a full scale range spanning the sensor signal output range or 100 to 480 mV.
Can I add cable to the sensor?
Yes, if properly spliced, the signal from the sensor is not affected by splicing on additional cable. Please check the product manual for details and limitations on adding cable. For information on how to create a proper waterproof splice, please visit our instructional webpage or watch our video. Additionally, we offer custom cable lengths of our high quality cable at the time of purchase.
FAQs
For both indoor and outdoor navigation, the altimeter function of barometric pressure sensors enables accurate vertical positioning. This is important when, for example, you're moving between floors in a building or levels in a car park.
What should a barometric pressure sensor read? ›
The sensor should read approximately 4100 mV at sea level, with the voltage output decreasing by approximately 50 mV per 100 meters above sea level. What measurement devices are compatible with the SB-100? A compatible measurement device should have resolution of at least 0.459 mV (0.01 kPa).
How accurate is the barometric sensor? ›
Accurate within 1.5 % across a pressure range of 15 to 115 kPa (4.43 to 34.96 in Hg). Long-term non-stability has been measured continuously indoors and in natural conditions (with sensors mounted inside a datalogger enclosure) for multiple sensors and is less than 1 % per year.
What are the problems with the barometric pressure sensor? ›
Will a malfunctioning Barometric Pressure Sensor illuminate the check engine light or affect vehicle operation? Yes, a failing BARO sensor can illuminate the MIL, and may cause drivability problems such as stumbling, stalling and sluggish acceleration.
Does barometric pressure matter? ›
It helps you understand weather patterns.
In a low-pressure system, the air congregates higher up in the atmosphere, where the temperature is cooler and less capable of holding water vapor—resulting in a cold-weather day with a higher chance of precipitation.
Does barometric pressure affect everyone? ›
Some people are more sensitive than others to changes in barometric pressure, also known as atmospheric pressure, which typically decreases when weather conditions worsen.
How do you decode barometric pressure? ›
The three digits in the upper-right-hand corner of the station model represent the last three digits of the station's sea-level pressure, expressed to the nearest tenth of a millibar. Thus, to decode the pressure reading, you must first add a decimal in front of the right-most digit.
What is a good or bad barometric pressure? ›
Barometric pressure range
A barometric reading over 30.20 inHg is generally considered high, and high pressure is associated with clear skies and calm weather. A barometric reading below 29.80 inHg is generally considered low, and low pressure is associated with warm air and rainstorms.
What is the best barometric pressure? ›
In summary:
- High Pressure: above 30.2 inHg.
- Normal Range: 29.8 inHg - 30.2 inHg.
- Low Pressure: below 29.8 inHg.
Basically barometric pressure does not change very fast- about 0.001 to 0.002 atmospheres per hour depending on how fast the storm is moving.
The most basic change in pressure is the twice daily rise and fall due to the heat from the sun. Each day, the pressure is at its lowest around 4 a.m./p.m., and at its highest around 10 a.m./p.m. The magnitude of the daily cycle is greatest near the equator, decreasing toward the poles.
Does barometric pressure ever change? ›
Barometric pressure is measured using a barometer. When the barometer rises, this indicates increasing atmospheric pressure and when the barometer falls, this indicates a decrease in atmospheric pressure. Rising barometric pressure usually brings better weather and as it falls, the weather usually worsens.
How low can barometric pressure go? ›
Barometric pressure, an indicator of the weight of column of air, ranges from an historic high of 32.01 inches to an all-time low of 25.9 inches.
What happens when the barometric pressure is low? ›
Low barometric pressure can be indicated weather-wise by a storm. That's because, when atmospheric pressure decreases, air rises and is condensed into water, causing it to fall back down as rain.
What is considered a low barometer reading? ›
A barometric reading below 29.80 inHg is generally considered low, and low pressure is associated with warm air and rainstorms. If the reading is under 29.80 inHg (100914.4 Pa or 1009.144 mb):
What PSI should barometric pressure be? ›
The typical pressure at sea level is 1013.25 millibars or 14.7 pounds per square inch.
What is the normal reading of a MAP sensor? ›
With the ignition on, the MAP sensor output should be around 5 volts. Start the engine and check the reading; at idle, the MAP sensor should read 1 to 2 volts. This indicates the MAP sensor is responding to changes in vacuum.
What is considered high and low barometric pressure kPa? ›
Average air pressure is around 101.3 kPa. A high pressure system would give you a reading closer to 103.0 kPa and a low pressure system might give you a reading around 100.0 kPa.
