TM
ATMOS 14

4-in-1 Temperature & Relative Humidity Sensor

Microclimate measurement made simple

ATMOS 14

Microclimate measurement made simple

If you’re doing a microclimate or evapotranspiration study, you may need up to four extra sensors to get important measurements that will benchmark your data. Not to mention you have to face the hassle of getting all those sensors integrated into your system. What you need is something simpler. With this in mind, we engineered the ATMOS 14 to be four sensors in one—air temperature, relative humidity, barometric pressure, and vapor pressure. And best of all, it’s plug and play with our EM60G data logger.

With the ATMOS 14, all your bases are covered

Thousands of engineers and ecologists already depend on the ATMOS 14 for straightforward measurements. Whether you’re using the EM60G to look at plant emergence, leaf area index, or fractional interception, there isn’t an easier way to benchmark your data. The ATMOS 14 is a versatile, low-maintenance, and fast sensor designed to make taking temp/RH measurements simpler and therefore less work.

Plug it in, and walk away

Despite its minimalist design, the ATMOS 14 provides maximum value. While other sensors require wiring and programming, the ATMOS 14 simply plugs into the EM60G (It’s also compatible with third-party data loggers). There’s no having to figure out complicated instructions. Just mount the sensor on your data logger mast, plug it in, and walk away.

Measures a lot. Requires very little effort.

The ATMOS 14 is low-maintenance. It gives accurate vapor pressure and RH without a lot of cleaning. Plus it’s weatherproof, meaning it will last a long time in the field. Another helpful feature is the compact shape that fits into tight spaces, leaving room on a mast for other sensors.

Readings don’t get any more rapid

Because the ATMOS 14 is plug and play, setup is quick. And responses are equally fast. Thanks to a Teflon protection screen that keeps liquid water out, but vapor moving freely through, it responds rapidly while keeping dust and liquid water off the sensor. Both features add up to time saved on your part.

For everything it measures, there’s not much to it

With ATMOS 14, all your basic microclimate measurements are covered using a small, simple integrated sensor. This versatile, low-maintenance sensor will rapidly and reliably measure air temperature, relative humidity, barometric pressure, and vapor pressure, making benchmarking quick and hassle-free.

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Features

  • Four measurements in one sensor
  • Plug and play capability
  • Collect data remotely when used with the EM60G data logger
  • Compact
  • Teflon screen protects the sensor from weather
  • Fast response
  • Integrated temperature for accuracy

Specifications

MEASUREMENT SPECIFICATIONS

RELATIVE HUMIDITY (RH)

Range

0 to 100% RH

Resolution

0.1% RH

Accuracy

Sensor measurement accuracy is variable across a range of RH. Refer to the chart in Figure 1.

Figure 1. RH sensor accuracy

Equilibration time (τ, 63%)

<40 s (response time in 1 m/s air stream)

Hysteresis

< 1% RH, typical

Long-term drift

< 0.5% RH/year, typical

TEMPERATURE

Range

-40 to 80 °C

Resolution

0.1 °C

Accuracy

Sensor measurement accuracy is variable across a range of temperatures. Refer to the chart in Figure 2.


Figure 2. Temperature sensor accuracy

Equilibration time (τ, 63%)

< 400 s (response time in 1 m/s air stream)

Long-term drift

< 0.04 °C/year typical

VAPOR PRESSURE

Range

0 to 47 kPa

Resolution

0.001 kPa

Accuracy

Sensor measurement accuracy is variable across a range of temperatures and RH. Refer to the chart in Figure 3.


Figure 3. Vapor pressure sensor accuracy

BAROMETRIC PRESSURE

Range

49-109 kPa

Resolution

0.01 kPa

Accuracy

0.4 kPa

COMMUNICATION SPECIFICATIONS

Output

DDI serial or SDI-12 communications protocol

Data logger compatibility

Any data acquisition system capable of 3.6- to 15-VDC power and serial or SDI-12 communication.

PHYSICAL SPECIFICATIONS

Dimensions

Diameter: 2.0 cm (0.8 in)
Height: 5.4 cm (2.1 in)

Operating temperature range

Minimum: –40 °C
Maximum: +80 °C
NOTE: Sensors may be used at higher temperatures under certain conditions; contact Customer Support for assistance.

Cable length

5 m (standard)
75 m (maximum custom cable length)
NOTE: Contact Customer Support if a nonstandard cable length is needed.

Connector types

3.5-mm stereo plug connector or stripped and tinned wires

ELECTRICAL & TIMING CHARACTERISTICS

Supply voltage (VCC to GND)

Minimum: 3.6 VDC
Maximum: 15.0 VDC

Digital input voltage (logic high)

Minimum 2.8 V
Typical: 3.0 V
Maximum: 5.5 V

Digital input voltage (logic low)

Minimum: –0.3 V
Typical: 0.0 V
Maximum: 0.8 V

Digital output voltage (logic high)

Typical: 3.6 V

Power line slew rate

Minimum: 1.0 V/ms

Current drain (during measurement)

Minimum: 4.50 mA
Typical: 4.75 mA
Maximum: 5.00 mA

Current drain (while asleep)

Typical: 0.03 mA

Power up time (DDI serial)

Maximum: 100 ms

Power up time (SDI-12)

Minimum: 100 ms
Typical: 1,100 ms
Maximum: 1,100 ms

Measurement duration

Typical: 550 ms
Maximum: 600 ms

Cable capacitance per meter

Typical: 147 pF

Cable resistance per meter

Typical 34 mΩ

COMPLIANCE

Manufactured under ISO 9001:2015
2004/108/EC and 2011/65/EU
EN61326-1:2013
EN50581:2012

Support

We manufacture, test, calibrate, and repair every instrument in-house. Our scientists and technicians use the instruments every day in our product testing lab. No matter what your question is, we have someone who can help you answer it.

Email: support.environment@metergroup.com

Phone US: +1 509-332-5600
Phone Europe: +49 12 66 52 24 0

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