CS215-L Digital Air Temperature and Relative Humidity Sensor

Name: CS215-L - Digital Air Temperature and Relative Humidity Sensor
Brand: Campbell Scientific

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Air Temperature and Relative Humidity Sensors / CS215-L

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This product is not available for new orders. We recommend ordering: HygroVue 5.

CS215-L Digital Air Temperature and Relative Humidity Sensor

Services Available
Repair	Yes
Calibration	No
Free Support	Yes

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Detailed Description
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Specifications
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Overview

The CS215 is a temperature and relative humidity probe that uses a Swiss-made digital humidity and temperature element that makes accurate and stable measurements. The element is based on Sensirion's CMOSens technology, which has been tested for more than two years in alpine conditions. The CS215 outputs an SDI-12 signal that is measurable by most Campbell Scientific data loggers.

Accurate and stable measurements
Field changeable element allows on-site recalibration
Each sensor element is individually calibrated so no further adjustment of the probe is required
Low power consumption
Digital SDI-12 output
Wide operating range

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CS215-L probe

CS215-L probe mounted with a 6-plate shield (non-probe items sold separately)

Similar Products

HMP60-L Air Temperature and Relative Humidity Sensor

HMP155A-L Air Temperature and Relative Humidity Sensor

Detailed Description

The CS215 uses the Sensirion SHT75, a combined relative humidity and temperature element, to provide accurate, stable measurements. The Sensirion SHT75 element is field-replaceable, eliminating the downtime typically required for the recalibration process. The CS215 outputs an SDI-12 signal that's measurable by many Campbell Scientific data loggers.

The CS215 should be housed in a solar radiation shield—typically the 41303-5A. The 41303-5A 6-plate naturally aspirated shield attaches to a mast, crossarm, or tower leg.

Compatibility

Sensor Mounts

When exposed to sunlight, the CS215 must be housed in a 41303-5A radiation shield. To attach the 41303-5A to a CM202, CM204, or CM206 crossarm, place the 41303-5A’s U-bolt in the bottom holes. To attach the radiation shield directly to a tripod mast, tower mast, or tower leg, place the U-bolt in the side holes.

The CS215-L Temperature and RH sensor can also be housed in the 43502 if a special adapter from R. M. Young (R. M. Young pn 43537) is used.

Specifications

Sensing Element	Sensirion SHT75
Measurement Description	Temperature, relative humidity
Signal Type/Output	SDI-12
Communication Standard	SDI-12 V1.3 (responds to a subset of commands)
Housing Material	Anodized aluminum
Housing Classification	IP65 (NEMA 4)
Sensor Protection	Outer glass-filled polypropylene cap. Inner expanded PTFE filter. Filter material has a porosity of 64% and a pore size of < 3μm.
Supply Voltage	The supply voltage is typically powered by the data logger's 12 V supply. 7 to 28 Vdc (for serial numbers E13405 and newer) 6 to 18 Vdc (for older models)
Typical Current Drain	120 μA (quiescent) 1.7 mA (measurement takes 0.7 s)
EMC Compliance	Tested and conforms to IEC61326:2002.
Operating Temperature Range	-40° to +70°C
Field Replaceable Chip or Recalibrate	Field-replaceable chip
Diameter	1.2 cm (0.5 in.) at sensor tip 1.8 cm (0.7 in.) at cable end
Length	18.0 cm (7.1 in.) including strain relief
Weight	150 g (5.3 oz) with 3.05 m (10 ft) cable

Relative Humidity
Measurement Range	0 to 100% RH (-20° to +60°C)
Output Resolution	0.03% RH
Accuracy	±2% (10% to 90% range) at 25°C ±4% (0% to 100% range) at 25°C
Short-Term Hysteresis	< 1% RH
Temperature Dependence	Better than ±2% (-20° to +60°C)
Typical Stability	±1.0% per year
Response Time with Filter	< 20 s (63% response time in still air)
Calibration Traceability	NIST and NPL standards

Air Temperature
Measurement Range	-40° to +70°C
Output Resolution	0.01°C
Accuracy	±0.3°C (at 25°C) ±0.4°C (5° to 40°C) ±0.9°C (-40° to +70°C)
Response Time with Filter	< 120 s (63% response time in air moving at 1 m s^-1)

Documents

Videos & Tutorials

SDI-12 Sensors | Watch or Sniffer Mode - 3:20

Frequently Asked Questions

Number of FAQs related to CS215-L: 13

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If a site is located in a fairly arid location, yet the RH reading from the CS215-L is 100%, what might cause this erroneous reading?

Relative humidity (RH) from the probe is capped at 100%. If readings of 100% occur during drier conditions, it is possible that the chip, the entire sensor, or both have associated issues. Repair, maintenance, or replacement is likely needed. Contact Campbell Scientific for assistance.
Can a new filter cap be purchased for the CS215-L?

Yes. This is pn 18142.
Is the sensor chip of the CS215-L field-replaceable?

Yes, using pn 18144, Replacement RH and Temperature Element and Filter Cap for CS215. However, Campbell Scientific recommends taking the necessary precautions associated with changing electronics in the field. As this is a relatively small chip, it is not recommended to replace the chip during stormy weather or without having some type of collection container placed underneath in case the chip is accidentally dropped.

For assistance replacing the chip, refer to the “Maintenance and Calibration” section of the instruction manual.
If the reported values for temperature and/or relative humidity from a CS215-L are not valid numbers, what should be done?
If the values are not within the published range of the sensor, there are several things to check:
1. If the yellow cap has not already been removed, remove it.
2. Verify that the program is correct without additional multipliers or offsets.
3. Ensure that the filter and radiation shield are clean so that air can freely flow into and past the sensor.
4. If the first value returned in the array is NAN, this is usually an indication that the data logger is unable to communicate with the sensor. This could be caused by a power issue, an incorrect SDI-12 address, one or more disconnected wires, or a broken sensor.
Can a replacement chip for the CS215-L be purchased?

Yes. This can be purchased from Campbell Scientific (pn 18144, Replacement RH and Temperature Element and Filter Cap for CS215). This chip replaces both the temperature and RH humidity sensing element.
What maintenance is recommended for the CS215-L?

Refer to the “Maintenance and Calibration” section of the instruction manual.
Can the CS215-L be calibrated?

No. The sensor cannot be calibrated, but Campbell Scientific can perform a calibration verification that includes multiple points (temperature and relative humidity). Campbell Scientific recommends using three points for RH (10%, 50%, and 90%) at one temperature (25 degrees Celsius), as well as an additional temperature point. This verification process has an initial setup charge and an additional per-point charge. Campbell Scientific sends a document indicating the values tested to with the accompanying measurement from the associated sensor.
What is the difference between the CS215-L and the HMP60-L?

The most significant difference is that the CS215-L has an SDI-12 output and that the HMP60-L has a voltage output. Additional differences are outlined in the “Air Temperature & Relative Humidity” brochure, which compares all of the Campbell Scientific temperature and relative humidity sensors.
What are the different cable length choices available for Campbell Scientific sensors?
Most Campbell Scientific sensors are available as an –L, which indicates a user-specified cable length. If a sensor is listed as an –LX model (where “X” is some other character), that sensor’s cable has a user-specified length, but it terminates with a specific connector for a unique system:
- An –LC model has a user-specified cable length for connection to an ET107, CS110, or retired Metdata1.
- An –LQ model has a user-specified cable length for connection to a RAWS-P weather station.
If a sensor does not have an –L or other –LX designation after the main model number, the sensor has a set cable length. The cable length is listed at the end of the Description field in the product’s Ordering information. For example, the 034B-ET model has a description of “Met One Wind Set for ET Station, 67 inch Cable.” Products with a set cable length terminate, as a default, with pigtails.

If a cable terminates with a special connector for a unique system, the end of the model number designates which system. For example, the 034B-ET model designates the sensor as a 034B for an ET107 system.
- –ET models terminate with the connector for an ET107 weather station.
- –ETM models terminate with the connector for an ET107 weather station, but they also include a special system mounting, which is often convenient when purchasing a replacement part.
- –QD models terminate with the connector for a RAWS-F Quick Deployment Station.
- –PW models terminate with the connector for a PWENC or pre-wired system.
Where are the available cable termination options listed for a particular sensor?
Not every sensor has different cable termination options. The options available for a particular sensor can be checked by looking in two places in the Ordering information area of the sensor product page:
- Model number
- Cable Termination Options list
If a sensor is offered in an –ET, –ETM, –LC, –LQ, or –QD version, that option’s availability is reflected in the sensor model number. For example, the 034B is offered as the 034B-ET, 034B-ETM, 034B-LC, 034B-LQ, and 034B-QD.

All of the other cable termination options, if available, are listed on the Ordering information area of the sensor product page under “Cable Termination Options.” For example, the 034B-L Wind Set is offered with the –CWS, –PT, and –PW options, as shown in the Ordering information area of the 034B-L product page.

Note: As newer products are added to our inventory, typically, we will list multiple cable termination options under a single sensor model rather than creating multiple model numbers. For example, the HC2S3-L has a –C cable termination option for connecting it to a CS110 instead of offering an HC2S3-LC model.

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