Ambient Weather PM2.5IN Manual del usuario - Página 4
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Wireless communication is susceptible to interference, distance, walls and metal barriers. We
recommend the following best practices for trouble free wireless communication.
1. Electro-Magnetic Interference (EMI). Keep the console several feet away from computer monitors
and TVs.
2. Radio Frequency Interference (RFI). If you have other 433 MHz devices and communication is
intermittent, try turning off these other devices for troubleshooting purposes. You may need to relocate
the transmitters or receivers to avoid intermittent communication.
3. Line of Sight Rating. This device is rated at 300feet line of sight (no interference, barriers or walls)
but typically you will get 100feet maximum under most real-world installations, which include passing
through barriers or walls.
4. Metal Barriers. Radio frequency will not pass through metal barriers such as aluminum siding. If
you have metal siding, align the remote and console through a window to get a clear line of sight.
The following is a table of reception loss vs. the transmission medium. Each "wall"or obstruction
decreases the transmission range by the factor shown below.
Medium
Glass (untreated)
Plastics
Wood
Brick
Concrete
Metal
4. Specifications
4.1 Measurement Specifications
Measurement
Range
PM 2.5
0~999ug/m3
4.2 Wireless Specifications
Transmission distance in open field: 300 feet line of sight, 100 feet under most conditions.
Frequency: 915 MHz
Sensor reporting interval: 10 minutes
4.3 Power Specifications
PM2.5 sensor: AC power, 2 x AA back up batteries (not included).
4.4 High Moisture Limitations
High moisture should not be an issue when the sensor is placed indoors, but the following section is
included in the event the sensor is placed in a high moisture environment, like a greenhouse.
Version 1.0
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Figure 3
RF Signal Strength Reduction
5-15%
10-15%
10-40%
10-40%
40-80%
90-100%
Accuracy
>100ug/m3, ±15%
<100ug/m3, ±15ug/m3
(at 25°C ±5°C)
Resolution
1ug/m3
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