Battery-Operated Telemetry

Field of application

The Tube400-Open is a battery-operated datalogger and telemetry device, especially designed for monitoring environmental parameters as water and air quality, water levels and water flow, groundwater monitoring, and many others.

It offers the possibility to perform all the key tasks in every measurement station, from the data collection and storage to the data and alarm transmission.

While in its standard configuration it has a IP67 tubular-shaped case, suitable for fitting in a 2” wells, the board-only version is also available for OEM.

Operating Principle

Tube400 collects the measurements from external sensors and stores them in a non-volatile memory. These data can be sent later via ftp or email to the required destination.

The units stay in sleep mode for most of the time and the internal real-time clock wakes it up, according to the setup parameters, whenever one of these activities has to be performed:

  • Wakeup for sensor reading
  • Wakeup for data sending

In the first case, the Tube400 reads out all the connected sensors and stores the measurements into the log flash memory. If required, it sends alarm via SMS or email and then it goes back to the sleep state till the next programmed event.

In the second case, the Tube400 checks the log memory and sends all the new data to the required destinations (usually an ftp server).

Interfaces to the field

The Tube400 has several different interfaces that can be used for the connection of external sensors:     

  • 1 x RS485
  • 1 x RS232
  • 1 x SDI-12
  • 1 x Analog input 0-10V
  • 1 x Analog input 4-20 mA
  • 1 x Digital input

Additionally, one digital output is available for driving external devices under specific conditions.

All these interfaces are available together: that means, as an example, that a Modbus water quality sensor (working on rs485) , a sdi-12 temperature sensor, a 4-20mA level probe and a tipping bucket rain gauge can be connected at the same time to the Tube400.

Internal Sensor

Two sensors are built-in in the unit:

  • Atmospheric pressure sensor
  • Temperature sensor

The Atmospheric pressure sensor in intended to be used for automatic pressure compensation together with unvented level sensors.

The Temperature sensor provide the ambient temperature (inside the Tube400 enclosure).

Power supply

The Tube400 allows the use of different power sources:

  • 3 x 3.6V D-Size Lithium primary cells
  • 3 x 1.5V D-Size Alkaline cells

Note that External power and internal battery can be used at the same time.


Events: Up to 8 programmable events/day; data transmission, SMS transmission or TCP/IP connection

Logging: Automatic data logging.  Reading interval: 1 minute to 24 hours

Alarms: Alarm transmission (SMS or email) in case of: reading out of range, tampering, low battery, memory full.


Modem: LTE Cat-M1/NB1 with 2G fallback. Global coverage

Antenna: IP67 Stubby antenna for 4G LTE, GSM (53,5 x 10mm)

Bluetooth: BLE module with built-in antenna, SIG v5.0 qualified.


Flash memory: Solid state flash memory. 128Mb expandable on request. 128Mb allows to store more than one million of single measurements.


Remote: FTP or email data sending; real-time connection via TCP/IP.

Local: Data download via Bluetooth and dedicated app.


Analog: 0-10Vdc input, 4-20mA input

Discrete Digital: Digital input, level or pulse with high frequency pulse counter, Digital output

Digital interfaces: RS232, RS485, SDI-12

Other: Power output for sensors supply.


Remote: via Bluetooth interface and dedicated app (phone) or software (PC)

Local: via ftp file upload or via direct TCP/IP connection


Temperature: Internal temperature sensor

Atmospheric pressure: Optional barometric sensor with automatic pressure compensation for non-vented level sensors


Field interfaces: PCB terminal block, 2x6 positions, pitch 2.54mm, 0.5mm2 max section

Modem antenna: Sealed SMA female connector

Battery: JST pitch 2mm 4 positions

SIM-card: Micro-sim (3FF) connector and E-sim support.


Internal battery: 3 x 3.6V D-Size Primary Lithium batteries

Auxiliary power input: 7-15 Vdc


Operating conditions: Temp: -25°C/+70°C Humidity 95% max n.c.

Case: PVC IP67

Dimensions: 466 x 43 mm (without antenna and Eye bolt)

Weight (without batteries): 200g


Tube400-open Fully Integrated Telemetry device 2/3/4G

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