APRS World, LLC

Temperature and Relative Humidity Sensor

 

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Temperature and Relative Humidity Sensor

Introduction:

Our temperature and relative humidity sensor is high quality and low cost. We utilize a precision calibrated sensor module and surround it with tough interface electronics and a rugged potted case. The sensor can measure temperature from -26°C to 70°C (-15°F to 158°F) and relative humidity from 3% to 100%. The sensor comes standard with a 2 meter (6 foot) shielded cable with wire leads.

Photos of the sensor in action can be found in the photo gallery.


Specifications:

Temperature
Range: -27°C to 70°C
Accuracy: ± 0.5°C typical
Response Time: 50 seconds in slow moving air
Relative Humidity
Range: 3% to 100% non-condensing
Accuracy: ± 2% RH typical
Linearity: ± 0.5% RH
Hysteresis: ± 1% RH, maximum
Temperature Coefficient: ± 0.008% RH / °C, maximum
Response Time: 25 seconds in slow moving air at 25°C
Recovery Time (from condensation): 10 seconds
Stability: ± 0.5% RH per year
Electrical Specifications
Input Voltage: 4 to 6 volts DC
Weight and Dimensions
Weight: 106 grams (3.7 ounces) including 3 m (10 ft) cable
Dimensions: 35 mm wide, 26 mm tall, 26 mm deep (1 x 1 x 1.4 in) not including cable

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Pricing:

Temperature and Relative Humidity Sensor, 2 meter (6 foot) cable
Product Photo
Click on photo to enlarge
US Price: $105.00 USD
Please call us at +1-507-454-2727 to place an order.

Or click here to order online from Off Grid Options .

Sensor measures temperature and relative humidity. Includes a 2 meter (6 foot) shielded cable with wire leads.


Part Number: APRS6577
Shipping Weight: 0.25 pounds
RoHS: compliant
Origin: USA
Solar Radiation Shield
Product Photo
Click on photo to enlarge
US Price: $40.00 USD
Please call us at +1-507-454-2727 to place an order.

Or click here to order online from Off Grid Options .

Solar radiation shield for temperature sensor or for temperature and relative humidity sensor. Provided as an easy to assemble kit. A variety of mounting options are possible. Can be mounted to a wall or structure with customer supplied mounting screws. Can also be mounted to a pole or mast with customer supplied hose clamps.

Shield Dimensions (WxH): 3" x 6"
Overall dimensions with bracket (WxLxH): 3" x 4.5" x 11"
Internal Dimensions (WxH): 1.75" x 5"


Part Number: APRS6547
Shipping Weight: 1.00 pounds
RoHS: unknown
Origin: USA

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Technical Details:

Hookup photo

Schematic

A schematic is available.

Wind Data Logger Configuration

The temperature and relative humidity (tempRH) is plugged into the "TEMP&ADC" connector on the Wind Data Logger. You will need our RJ-45 Breakout Board to Screw Terminals to connect to our data loggers. The self contained data loggers have a breakout board built in. The sensor should be hooked up like the photo on the right (click for larger image)::

The wire color information is as follows:

Black Ground
Red +4 to +6 VDC
White Temperature Signal (0 to 3.3 VDC)
Green Relative Humidity Signal (0 to 3.3 VDC)
Silver Shield

A typical connection to the Wind Data Logger's "Temp & ADC" Connector would be as follows:

Black Pin 2 or 8 (Ground)
Red Pin 3 (+5 Volts)
White Pin 4 (Analog 4)
Green Pin 5 (Analog 5)
Silver Pin 2 or 8 (Ground)

To display actual sensor readings on the Wind Data Logger you will need to configure the ADC channels. The following equations are used to convert the voltage output from the sensors to standard units:

Temperature:

°C=39.394*Vin - 30.0 (ADC M: 39.394 / ADC B: -30.0 / ADC Units: C)
°F=70.9092*Vin - 22.0 (ADC M: 70.9092 / ADC B: -22.0 / ADC Units: F)

Relative Humidity:

%RH=30.303*Vin (ADC M: 30.303 / ADC B: +0.0 / ADC Units: %)

The values in parenthesis should be entered into the ADC setup screens on the Wind Data Logger.

Stabilization Time

The sensor requires a stabilization period of up to 10 minutes after powering up the sensor.  Upon applying power, the sensor will initially output a signal of 0 volts.  After a short time, the signal voltages will start to rise until they eventually stabilize on the current ambient conditions.

Mounting

The sensor electronics are potted in a flexible polyurethane potting compound inside a small ABS plastic potting box. This protection allows the sensor to be used indoors with no additional protection. For outdoor use the sensor must be protected from direct moisture contact. For accurate temperature and relative humidity readings the sensor must have air flowing over it. We recommend that the sensor be protected by a solar radiation shield. APRS World sells a solar radiation shield, or a shield may be homebrewed or purchased from another source.

Mounting Locations Diagram
Dimension Inches Millimeters
Length (A)1.025.4
Width (B)1.025.4
Height (C)~1.0~25.4
Mounting Flange Length (E)1.8847.8
Mounting Flange Holes (F)1.37534.93
Mounting Hole Diameter0.1844.7

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Example Data:

The following data was captured on 2006-11-09 near Winona, Minnesota, USA. Weather conditions observed at the local airport can be found at:
http://www.wunderground.com/history/airport/KONA/2006/11/9/DailyHistory.html
Note that the local airport is approximately 15 miles distant.

Temperature Plot

Example temperature plot

Relative Humidity Plot

Example humidity plot

Raw Data

The raw data used to generate these plots is available as example_wiscoy.csv. Note that this data has been exported from our SQL database and is in a slightly different format than what is stored by the Wind Data Logger.

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In order to improve design and supply the best product possible, specifications may change without notice.