Q: Can the level sensor with cable detect the level of oil or other liquids?

Yes, you can put EM500-SWL to other liquids but need to do the data process on your server. The operating principle of EM500-SWL is to measure the liquid pressure and output the level based on formula P=ρgh and value ρ is fixed as pure water density 1g/cm³. You can calculate the other liquid level on your server by formula h=ρ1/ρ2*ho. (ρ1=water density=1g/cm³, ρ2=other liquid density, ho=measuring result of EM500-SWL)

Besides, for corrosive liquids, please put the liquid type and concentration to Milesight to check if SWL probe and cable support and may customize other types of probes and cables.


Q: Can the water level probe touch the drinking water or milk?

Yes, the material of probe is 304 stainless steel, which is suitable for food applications. But please note that if there is any food safety approval requirement for this kind of product.


Q:When testing the level, should the probe suspend in the water or reach the bottom of the water? How deep should I put the probe inside the water?

This depends on your measuring requirement, if you need to measure the whole depth please make the probe reach the bottom, and please ensure the whole probe should be inside the water.


Q:How to install the probe and cable in the rushing water?

To get stable result, it is suggested to insert a a steel pipe with holes to cover the probe and cable.



Q:Is EM500-SWL affected by water condense or freeze?

No, as long as the probe is immerse in water under the ice.


Q: Can I connect a 0-10m range probe to a 3m measuring range EM500 transceiver?

Not suggested since the measuring range of every transceiver is fixed.


Q: Can EM500 transceiver support UV-proof?

Yes, the material of EM500 is ABS + PC which is UV-proof.


Q: Can EM500 series support external power supply?

Yes, it can be powered by type-C port inside the device, but this should release the IP67 case of EM500 transceiver. If you need to place outdoors, please customize the waterproof case or contact Milesight for customization services.


Q: Can EM500 series have ATEX certification?

No, EM500 series sensor is not designed for explosion proof and does not has ATEX certification.


Q: What is the sampling/collecting interval of every sensor?

The sampling/collecting interval is the same as reporting interval, you can change it by changing reporting interval.



Q: Why can not receive EM500 device battery level data on regular uplinks?

The reporting interval of EM500 battery level is 24 hours and this is non-editable.


Q: Will EM500 send threshold alarm packets? How often the device send the alarm?

Yes, EM500 device supports threshold alarm feature. When the value reaches the threshold, it will send the alarm once immediately. After that, it will not send instant again until the value is below the threshold.


Q: Does this device support low battery alarm?

Yes, the device will send a low battery alarm packet to network server when battery level is lower to 10%.


Q: Can the device work with other brand gateways?

Yes, the device can work with other brand gateways which supports standard LoRaWAN protocol.


Q: How the device achieve secure communication with gateway?

The device communicate with gateway via LoRaWAN protocol which support AES128 encryption and a series of communication mechanism, for details please refer to article:


Q: What is the default App EUI and AppKey? Can the device support random AppKeys?

The default App EUI is 24E124C0002A0001 and Appkey is 5572404C696E6B4C6F52613230313823.

Yes, the device support random Appkey pre-configuration and you can ask Milesight for it before purchase.


Q: Are device EUI, App EUI and Appkey editable on your device?

The device EUI is unique and non-editable, App EUI and Appkey can be edited via ToolBox.


Q: How to connect device to network servers like TTN, Chirpstack, Actility, Senet, etc?

Yes, please refer to Milesight IoT knowledge base:


Q: How to decode the data? Where can I find the decoder?

For the definition of data please refer to corresponding device user guides:

Milesight also provides decoder examples here: You can modify these decoders according to your platform requirements.


Q: What is the LoRaWAN version of EM500 series device?

The LoRaWAN version is 1.0.3.


Q: What reporting interval can the device be configured?

1 to 1080 minutes is configurable. It's not suggested to shorten the interval to second which will reduce the battery life quickly.


Q: What is the working mechanism of rejoin mode feature?

The device will send a specific number of LinkCheckReq MAC packets to the network server every 30 mins or longer to validate connectivity; If there is no response after the specific number of packets , the device will re-join the network.


Q: Can the device get confirmation to know if the data is sent to server?

Yes, please enable Confirmed Mode on ToolBox. If the device does not receive the confirmation, it will send the data once again.


Partial support, please refer to corresponding user guide for downlink commands:


Q: Is it possible setting the spreading factor of 915 frequency device to SF11 or SF12?

Not support now since SF11 and SF12 will over the dtwell time limitation restricted by LoRa Alliance and parts of countries. If you have any requirement for it please contact Milesight for details.


System & Maintenance

Q: What if I fail to read or configure the sensor via NFC?

  1. There is battery insulating sheet inside the device, please ensure the sheet is pulled out before powering on device.
  2. Connect type-C port to PC and check if ToolBox PC software can read this device. If ToolBox PC software works fine and ToolBox App not work if type-C is disconnected, it means the battery is dead please replace a new one.
  3. Pull out the battery and short cut the capacitor on the board for a few seconds, then restore everything back to check.


Q: Can the device upgrade remotely via LoRaWAN?

Not support, Milesight only provides locally upgrade via Milesight ToolBox App or ToolBox PC software now.


Q: Where to find the latest firmware of devices?

Please find the latest firmwares here:


Q: Can I backup the configurations of one device and import to another device?

Yes, both Milesight ToolBox App and software supports backup feature, this should ensure both devices have the same model and frequency.


Q: Can all default parameters of pre-configured before shipping?

Yes, Milesight provide OEM services to pre-configure the device settings before shipping to save your time to configure bulk of devices.


Q: Can Milesight provide code to modify the firmware?

No, the device does not support firmware modification by yourselves. If you have any extra feature requirements, please contact Milesight for software customization services.


Q: Does the device have any API to get the data?

No, the device can only send data to gateway via LoRaWAN. It's suggested to connect device to Milesight gateway which provides MQTT/HTTP API to send data to your applications.


Q: How to get device debug logs for troubleshooting?

Please refer to article How to Get Milesight Node Log File.