Q1: EM300-TH sends Payload 03 67 fa ff 04 68 c5 from time to time. Temperature would be FA FF => FF FA = 65530, temperature is 65530 * 0.1 = 6553ºC. Is it correct?
Answer: This kind of payload only happens when the temperature value is negative.Temperature is a signed value so the FF FA should be decoded as -6, and real temperature is -0.6ºC. You can refer to our decoder for data process.
Q2: Could you please let us know how to force the sensor to join the network after a join request has already been approved with another LNS?
Answer: To force the sensor to rejoin network, you can modify the basic parameters to make sensor send rejoin packet to another NS.
Q3: Which standard do you use to define TVOCs?
Answer: Please refer to related definition about the parameter of TVOC as below.
TVOC Level mg/m3 | Level of Concern |
Less than 0.3 mg/m3 (<300 ppb) | Low |
0.3 to 0.5 mg/m3 (300~500 ppb) | Acceptable |
0.5 to 1 mg/m3 (500~1000 ppb) | Critical |
Q4: When placed the 3 sensors in our calibration box where the condition and the environment is very constant, we got really different TVOC levels. Is there any calibration we need to do? Why do we get such different values and how do we fix it?
Answer: Although TVOC values of the 3 sensors are at different range, the trend is similar. That's caused by different base line. The base line of TVOC is dynamic. That is to say, when it's powered on, the first measured value by the sensor will be regarded a part of the base line. If the new measuring data is lower than the previous one, this new data will become the new base line, which makes base lines different for the 3 sensors.
To calibrate the value, you can restart the AM107 by ToolBox via NFC, then it will refresh the baseline and report data correctly.
Q5: Is there any possibility to have EM500 transceiver factory fitted with a PT1000 RTD sensor rather than a PT100?
Answer: The standard EM500 transceiver doesn't support PT1000 sensor. If you have a certain application about this requirement, please contact Milesight for evaluation.
Another solution is to connect a PT1000-RS485(Modbus RTU) converter module to RS485 of UC50x/UC11xx controllers.
Q6: Can you please share a document/video on how to register Milesight devices on the new TTSv3 server?
Answer: Please refer to article How to Connect Milesight End Devices to The Things Stack v3.
Q7: How long (Seconds or Minutes) does it take to send data from sensor to Milesight IoT Cloud?
Answer: If network status of the gateway is good, there is almost no latency after sensor sends data out.
Q8: I need DevEUI, AppEUI and Appkey of Milesight sensors.
Answer: DevEUI is unique for each sensor. You can get it from the product label. You can also read it on ToolBox app via NFC or ToolBox PC via USB Type C.
APPEUI is 24E124C0002A0001 and AppKey is 5572404c696e6b4c6f52613230313823 by default for all sensors.
Q9: In the EM500-SLD configuration we see "alarm reporting interval". Could you explain meaning of this parameter? We must be sure to receive alarm.
Answer: When water leakage sensor is triggered, it will send alarm message. After the alarm reporting interval, the device will detect the water leakage and send alarm message if triggered.
Q10: For EM500 Series, if I set report interval as 600s (10 mins), how long the battery can last? Any guideline formula to calculate?
Answer: Please refer to the following table for battery life in theory (19000 mAh battery):
Model | Report Interval(s) | LORA Freq-SF | Battery Life(Day) | Battery Life(Year) |
EM500-SMT-EC5 | 600 | 868-SF12 | 2827.645073 | 7.746972803 |
EM500-SWL | 600 | 868-SF12 | 2208.420933 | 6.050468308 |
EM500-UDL | 600 | 868-SF12 | 2972.990084 | 8.145178313 |
EM500-PT100 | 600 | 868-SF12 | 2899.70632 | 7.944400876 |
EM500-SMTC-MEC20 | 600 | 868-SF12 | 1924.796712 | 5.273415649 |
EM500-SWL | 600 | 868-SF12 | 2117.894891 | 5.802451757 |
EM500-CO2 | 600 | 868-SF12 | 2887.594031 | 7.911216523 |
EM500-LGT | 600 | 868-SF12 | 2248.372524 | 6.159924724 |
EM500-PP | 600 | 868-SF12 | 2220.018382 | 6.082242143 |
Q11: Can the EM500-SMTC measure the conductivity of the liquid?
Answer: Yes, it can measure the water-soluble fertilizer, and other nutrient solution.
Q12: For EM300 Series, if I set report interval as 600s, how long the battery can last?Any guideline formula to calculate?
Answer: Please refer to following table for battery life in theory:
Model | Report Interval(s) | LORA Freq-SF | Battery(mAh) | Battery Life(Year) |
EM300-TH-EU868 | 600 | SF10 | 4000 | 8.449444956 |
EM300-TH-915 | 600 | SF10 | 4000 | 5.548146646 |
EM300-TH-CN470 | 600 | SF10 | 4000 | 8.320120342 |
Q13: Why the AM107 report different CO2 value at same site?
Answer: This may caused by different base line. The base line of CO2 value is dynamic. When it's powered on, the first measured value by the sensor will be regarded a part of the base line. If the new measuring data is lower than the previous one, this new data will become the new base line. You can calibrate CO2 manually at the same position, according to article How to Calibrate CO2 Value of AM107/EM500-CO2.
Q14: Can EM500-PT100 support to detect the cooking pot?
Answer: Yes, it can, our probe is made of 304 stainless steel which supports usage in food industry .
Q15: Can the EM500-CO2 be used in a piggery barn with high NH3?
Answer: EM500-CO2 detects the CO2 based on NDIR (Non-Dispersive Infrared), it won't be affected by any other gases.
Q16: How long the cable of EM300-MCS, EM300-SLD, EM300-ZLD support?
Answer: EM300-MCS, EM300-SLD can support to 1.5 meters, and the EM300-ZLD can support to 3 meters by defaults. For longer cable demand, please enquire our sales.
Q17: Is it possible to connect EM500 with power supply?
Answer: EM500 Series sensors can only powered by battery due to the waterproof and dustproof requirement that the outer shell must not have any slot.