ATMOS 14 Temperature and Humidity Sensor and More

With the ATMOS 14, all your bases are covered
We engineered the  ATMOS 14 temperature and humidity sensor to be four sensors in one—air temperature, relative humidity, barometric pressure, and vapor pressure. It’s a versatile, low-maintenance, and fast sensor designed to make temp/RH measurements simpler and less work. And best of all, it’s plug and play with our ZL6 data logger.

A temperature and humidity sensor you can plug in, and walk away
While other sensors require wiring and programming, the ATMOS 14 simply plugs into the ZL6 (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.

Compact, weatherproof, and low maintenance
The ATMOS 14 temperature and humidity sensor 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. Its compact shape fits into tight spaces, leaving room on a mast for other sensors.

Measure more. Work less.
With ATMOS 14, all your basic microclimate measurements are covered using a small, simple integrated sensor. Thousands of engineers and ecologists depend on the ATMOS 14 temperature and humidity sensor for straightforward measurements. Whether you’re using it to look at plant emergence, leaf area index, or fractional interception, there isn’t an easier way to benchmark your data.

Measurement Specifications

Relative Humidity (RH):
Range: 0 – 100 % RH (0.00-1.00)
Resolution: 0.10% RH
Accuracy: Sensor measurement accuracy is variable across a range of RH. See specification chart.
Equilibration Time (τ, 63%): < 25 s (response time in 1 m/s air stream)
Hysteresis: ±0.80% RH, typical
Long-term Drift: ±0.25% RH/year, typical

Temperature:
Range: -40.00 – 80.00 °C
Resolution: 0.1 °C
Accuracy: ±0.20 °C
Equilibration Time (τ, 63%): < 165 s (response time in 1 m/s air stream)
Long-term Drift: < 0.03 °C/ year, typical

Vapor Pressure:
Range: 0 – 47 kPa
Resolution: 0.01 kPa
Accuracy: Sensor measurement accuracy is variable across a range of temperatures and RH. See specification chart.

Barometric Pressure:
Range: 1 – 120 kPa
Resolution: 0.01 kPa
Accuracy: ±0.05 kPa at 25 °C
Equilibration Time (τ, 63%): < 10 ms
Long-term Drift: < 0.1 kPa/year, typical

Communication Specifications

Output:
DDI serial or SDI-12 communication

Data Logger Compatibility:
Any data acquisition system capable of 4.0- to 15.0-VDC power and serial or SDI-12 communication.

Physical Specifications

Dimensions:
Diameter: 2.0 cm (0.8 in)

Operating Temperature Range:
Minimum: -40.00 °C
Maximum: 80.00 °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)

Cable Diameter:
0.165 ±0.004 in (4.20 ±0.10 mm), with minimum jacket of 0.030 in (0.76 mm)

Connector Types:
3.5-mm stereo plug connector or stripped and tinned wires
Conductor Gauge
22-AWG / 24-AWG drain wire

Electrical and Timing Characteristics

Supply Voltage (VCC to GND)
Minimum: 4.0 VDC
Maximum: 15.0 VDC

Digital Input Voltage (Logic High)
Minimum: 2.8 V
Typical: 3.6 V
Maximum: 5.0 V

Digital Input Voltage (Logic Low)
Minimum: -0.3 V
Typical: 0.0 V
Maximum: 0.8 V

Digital Output Voltage (Logic High)
Minimum: NA
Typical: 3.6 V
Maximum: NA

Power Line Slew Rate
1.0 V/ms

Current Drain (During Measurement)
Minimum: 1.2 mA
Typical: 3.5 mA
Maximum: 12.0 mA

Current Drain (While Asleep)
Minimum: NA
Typical: 0.03 mA
Maximum: NA

Power Up Time (DDI Serial)
Minimum: NA
Typical: NA
Maximum: 110 ms

Power Up Time (SDI-12)
Minimum: 140 ms
Typical: 260 ms
Maximum: 400 ms

Power Up Time (SDI-12, DDI Serial Disabled)
Minimum: NA
Typical: 170 ms
Maximum: 200 ms

Measurement Duration
Minimum: NA
Typical: 50 ms
Maximum: NA