CS106 Barometer

Name: CS106 - Barometer
Brand: Campbell Scientific

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Barometric Pressure Sensors / CS106

Wider Pressure Range
Resides inside weatherproof enclosure

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Overview

The CS106, manufactured by Vaisala, measures barometric pressure for the range of 500 to 1100 hPa (mBar). This range equates to from below sea level (as in a mine) to over 15,000 feet above sea level. Designed for use in environmental applications, the CS106 is compatible with most Campbell Scientific data loggers. The CS106 has an attached 76.2 cm (30 in.) cable.

Optimized to mount in Campbell Scientific enclosures
Integral switching circuit limits power consumption to measurement cycle
Three-year warranty

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Detailed Description

The CS106 uses Vaisala’s BAROCAP silicon capacitive sensor to measure barometric pressure. It is encased in a plastic shell (ABS/PC blend) fitted with an intake valve for pressure equilibration.

The CS106 outputs a linear signal of 0 to 2.5 Vdc, which allows the barometer to be directly connected to a Campbell Scientific data logger. An internal switching circuit allows the data logger to power the CS106 only during measurement, which reduces power consumption.

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Compatibility

Please note: The following shows notable compatibility information. It is not a comprehensive list of all compatible products.

Data Loggers

	Compatible	Note
CR1000 (retired)
CR300 (retired)
CR3000 (retired)
CR310
CR350
CR6
CR800 (retired)
CR850 (retired)

Additional Compatibility Information

Data Logger Considerations

A 2.5-ft cable is supplied with the sensor for connection to the data logger. The cable connects to a control port, single-ended analog input terminal, 12 V power terminal, and ground terminal on the data logger.

Mounting

The CS106 is typically mounted next to the data logger inside an ENC12/14 or larger enclosure. The very small ENC100 is available for housing the CS106 separately, in its own enclosure.

Specifications

-NOTE-	1 hPa = 1 mBar
Pressure Range	500 to 1100 hPa
Long-Term Stability	± 0.1 hPa per year
Settling Time	1 s to reach full accuracy after power-up
Response Time	500 ms to reach full accuracy after a pressure step
Output Voltage	0 to 2.5 Vdc
Supply Voltage	10 to 30 Vdc
Elevation	~609.6 m (2,000 ft) below sea level (as in a mine) to 4,572 m (15,000 ft) above sea level
Accuracy	Accuracy refers to the root sum squared (RSS) of end point non-linearity, hysteresis, repeatability, and calibration uncertainty. ±0.3 hPa (@ +20°C) ±0.6 hPa (@ 0° to 40°C) ±1.0 hPa (@ -20° to +45°C) ±1.5 hPa (@ -40° to +60°C)
Linearity	±0.25 hPa
Hysteresis	±0.03 hPa
Repeatability	±0.03 hPa
Calibration Uncertainty	±0.15 hPa
Current Consumption	< 4 mA (active) < 1 µΑ (quiescent)
Temperature Range	-40° to +60°C
Dimensions	6.8 x 9.7 x 2.8 cm (2.7 x 3.8 x 1.1 in.)
Cable Length	76.2 cm (30 in.)
Weight	90 g (3.2 oz)

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Number of FAQs related to CS106: 12

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Is the CS106 a direct replacement for the CS105?

The CS106 is not a direct replacement. To use a CS106 in a system that previously used a CS105, the multiplier and offset will need to be changed in the program. Because the CS106 has a longer warm-up time, if the sensor is turned on and off, it may be necessary to make some adjustments to the warm-up time.
To replace a CS105 with a CS106 in an existing system, does anything extra need to be ordered?

The sensor plug on the CS106 is the same as the one on the CS105. If the cable and connections are still working correctly, it should be possible to power down the station and swap out the sensors without any difficulty.
Why might measurements with a CS100 or CS106 be bouncing (noisy)?
Noisy measurements may be caused by several factors:
- The sensor was not allowed to warm up adequately.
- The sensor is placed in an electrically noisy environment, which makes other analog measurements noisy.
- The power supply for the sensor or station is dirty. (There is not a clean regulated voltage.)
What is the warm-up time for the CS100 or CS106?

1 s.
Can a CS100 or CS106 be used to measure pressure in an application at very high humidity without damaging the sensor?
Yes, but only if certain conditions are met:
- The sensor resides in a non-condensing environment.
- The vent tube accessing the high humidity environment is extremely well desiccated to keep any moisture from reaching the sensor’s components. Moisture in the sensor will damage the sensor, often to an un-repairable state.
Does the CS100 or CS106 fit inside an ENC100 enclosure?

Either the CS100 or the CS106 can fit inside an ENC100. For more information, refer to the Specifications information on the ENC100 product page.
Does the CS100 or CS106 need to be vented to the outside of an enclosure or building?

In most cases, enclosures and buildings have enough little spaces for the pressure to stay at equilibrium with the outside pressure. Therefore, the sensor does not need to be vented to the outside. It is possible, however, that the rate at which the pressure equalizes is slowed by being in an enclosure, but the rate change usually is not noticeably significant.

If the sensor resides in an absolutely air-tight environment, and the pressure outside this environment needs to be measured, then the sensor will need to be vented to the outside. However, venting to the outside may change the rating of the enclosure or associated inside environment.
How often should the CS100 or CS106 be factory calibrated?

The manufacturer recommends calibration on a yearly basis. However, conformance to published standards or regulations may require this on a more frequent basis.
What are the multiplier and offset values used with a CS100 or CS106?

For a reading in millibars, the multiplier is 0.240, and the offset is 500. To convert the millibar reading to different units, add an equation to the code.

To correct the pressure to sea level, see the “Correcting Pressure to Sea Level” section in the CS100 instruction manual or in the CS106 instruction manual. Alternatively, use Short Cut for Windows to generate the program, and, when prompted, enter the appropriate site elevation.
Can a CS100 or a CS106 be enclosed and used to measure air pressure within a snowpack?

Generally, these sensors are designed to measure the pressure of the environment where they are installed. The CS100 or CS106 can measure the air pressure within a snowpack if the enclosure is adequately sealed away from the snow while allowing the vent to have access to the snow. Note that it may be difficult to accomplish this.

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