ES-Net
The base model. It has no screen and no buzzer. ES-Net specifications
Seismometer (ES series)
The ES series is a three-axis MEMS accelerometer seismometer designed by ExpTech. There are two models, ES-Net and ES-Pro. The seismometer measures acceleration in three directions 50 times per second, calculates instrumental seismic intensity on the device, and sends the data back to ExpTech over Wi-Fi. You can also connect it to a computer over USB Type-C and view the waveform in QuakeWatch-Pro.
Models
Section titled “Models”ES-Pro
It adds an OLED screen and a buzzer. ES-Pro specifications
| Item | ES-Net | ES-Pro |
|---|---|---|
| Dimensions (L × W × H) | 70 × 35 × 24 mm | 70 × 54.5 × 34 mm |
| Screen | None | OLED (128 × 64). Shows seismic intensity, acceleration, and the waveform |
| Buzzer | None | Yes. It sounds from the seismic intensity this unit measures |
| Sensor | Three-axis MEMS accelerometer, 50 SPS, ±2 g | Same as ES-Net |
| Connection | Wi-Fi 2.4 GHz, Bluetooth (for setup and updates), USB Type-C | Same as ES-Net |
| Power | USB Type-C, 5 V | Same as ES-Net |
| Hardware version | 1.0, 3.0 | 2.0, 3.0 |
Different hardware versions of the same model use the same firmware. The seismometer detects the version when it boots. When you update the firmware, select the correct model (ES-Net or ES-Pro). You do not need to tell the versions apart.
How it works
Section titled “How it works”- The seismometer measures three-axis acceleration 50 times per second. On the device, it calculates instrumental seismic intensity (the Japan Meteorological Agency, JMA, method) and acceleration. After it boots, it must collect 60 seconds of data before it starts outputting intensity.
- After it joins Wi-Fi, it syncs the clock over NTP on its own. Timestamps are usually within ±10 ms.
- A seismometer in networked mode connects to both of ExpTech’s core sites at the same time. If one site fails, the other still receives data. See Architecture and geo-redundancy.
- After the data enters TREM-net (the TREM seismic network), it is used by services such as real-time seismic intensity in DPIP.
Connection modes
Section titled “Connection modes”You can choose the mode when you set up Wi-Fi with ExpTech Home. To change it later, set it up again.
| Mode | Wi-Fi | Time sync | Data sent to ExpTech | Use |
|---|---|---|---|---|
| Networked (default) | Connected | Automatic NTP sync | Yes | Join TREM-net |
| Not networked | Connected | Automatic NTP sync | No | Read data over USB yourself, but you need accurate time |
| Standalone | Not connected | No sync | No | No Wi-Fi. Read data over USB only |
Before you start
Section titled “Before you start”- A 2.4 GHz home Wi-Fi network. You cannot use a phone hotspot or public free Wi-Fi.
- A stable indoor floor, with a power outlet nearby.
- A phone (iOS or Android) with ExpTech Home installed, for Wi-Fi setup and firmware updates.
- To view the waveform on a computer, also have a computer and a USB Type-C cable that can carry data.
For the full steps, see Installation and Wi-Fi setup.
Installation and Wi-Fi setupMount the seismometer, and set up Wi-Fi with ExpTech Home.
Firmware updates and recoveryUpdate over Bluetooth with the app, or flash again with the USB recovery tool.
Troubleshooting and common questionsThe LED, ES-Pro screen messages, and common problems.
QuakeWatch-ProView the waveform, spectrum, and seismic intensity on a computer in real time.