Solinst Model 3500 AquaVent Water Level Logger (DISCONTINUED - SEE AQUAVENT 5)

  • Automatic Barometric Compensation Reduces time required for post data processing
  • Continuous Reliable Water Level Data Suitable for long-term monitoring projects
  • Multiple Built-In Hydrophobic Filters & Desiccants No replacing required - reduces maintenance
Product Options


Please note: the AquaVent has been discontinued and replaced by the AquaVent 5

The new Solinst AquaVent™ delivers accurate water level and temperature measurements in shallow groundwater and surface water applications up to 65 ft (20 m). It consists of pressure and temperature sensors, hydrophobic filters and datalogger housed within stainless steel measuring 7/8” x 7” (22 mm x 178 mm). Its design utilises hydrophobic filters and permanent factory installed desiccants making the AquaVent virtually maintenance free.

The AquaVent comprises of a gauged pressure transducer that is open to the atmosphere via a vented cable to the surface. Atmospheric pressure is applied to the transducer diaphragm, applying a cancellation effect to the barometric pressure. This produces a water level recording.

The vented pressure sensor has been designed using Hastelloy®, making it extremely durable whilst maintaining its accuracy in various temperatures and monitoring applications. The sensor produces an accuracy of 0.05% FS and is capable of withstanding 2 times over-pressure without any permanent damage.

The Aquavent is compatible with all Solinst Levelogger Software and App, offering multiple logging options including linear, event and scheduled sampling. There is also the option of communicating through telemetry systems using MODBUS (RS-232/RS-485) or SDI-12 protocols. The AquaVent is available in ranges of 5, 10 and 20 metres.

Manufactured by: Solinst
Model: Solinst Model 3500 AquaVent Water Level Logger (DISCONTINUED - SEE AQUAVENT 5)

Services offered for this product

  • Sales
  • Rental
  • Installation
  • Calibration
  • Maintenance


Shallow applications: up to 65 ft (20 m)
Aquifer characterization: pumping tests, slug tests, etc.
Stream gauging, lake & reservoir management
Watershed, drainage basin & recharge monitoring
Stormwater & runoff monitoring
Long-term water level monitoring in wells & surface water


Level Sensor Piezoresistive Silicon with Hastelloy Sensor
Accuracy ± 0.05% FS Typical
Stability of Readings Superior, low noise
Units of Measure m, cm, ft., psi, kPa, bar, ºC, ºF
Normalization Automatic Temperature Compensation
Temp. Comp. Range. 0º to 50ºC
Temperature Sensor Platinum Resistance Temperature Detector (RTD)
Operating Temperature 20ºC to 80ºC
Temp. Sensor Accuracy ± 0.05ºC
Temp. Sensor Resolution 0.003°C
Battery Life 8 years - based on 1 reading / minute
Clock Accuracy ± 1 minute/year (-20ºC to 80ºC)
Thermal Response Time 3-5 minutes
Size 7/8" x 7" (22 mm x 178 mm)
Weight 4.6 oz. (129 grams)
Wetted Materials Delrin®, Viton®, 316L stainless steel, Hastelloy
Sampling Modes Linear, Event & User-Selectable with Repeat Mode, Future Start, Future Stop, Real-Time View
Barometric Compensation Automatic
Measurement Rates 1/8 sec to 99 hrs



Water level data from remote Leveloggers can be sent using the model 9500 LevelSender, which uses a GSM cellular modem to send the data to a home computer station or mobile device via email/SMS.
Leveloggers are connected to LevelSenders using a Reader cable which connects to the Levelogger’s Direct Read Cable. This can be done by removing the black dust cap from the LevelSender, lining up the holes and pushing the Reader Cable connector into the LevelSender connection and screwing the Reader Cable into the connection on the LevelSender until tight. Then connect the other end of the reader cable to the top end of the Levelogger’s direct read cable.
Within the diagnostic utility there is an option called ‘read memory dump’ this will access previous logs from a backup location. This dumps all of the Leveloggers memory into a .xle file.

The free app is available on both Apple® and Android™ smart devices.
Apple devices must be running iOS 11 or later on the following compatible devices:

  • iPhone
  • iPad
  • iPad mini
  • iPod touch.

Android devices must be running version 5.0 or higher. Solinst does not guarantee compatibility on all devices running 5.0, but testing confirms the following can be used:

  • Phone: Samsung Galaxy S4 - Model SGH-1337M
  • Phone: Samsung Galaxy S5 - Model SM-G900W8
  • Tablet: Samsung Tab 4 (10.1”) - Model SM-T530NU

As the Levelogger App Interface will not connect directly to the top of a Solinst datalogger, it is necessary to have connection accessories. With the Levelogger or Rainlogger, one of the following accessories is required:

  • Direct Read Cable, clients use this option to suspend dataloggers in the field when they wish to communicate downhole.
  • When working with Leveloggers that are suspended from wireline, or cord, the units must be removed from the well and connected to either a Direct Read Cable (as above) or an Optical Adaptor.
  • For the LevelVent, just connect to the unit via the Vented Cable and LevelVent Wellhead that all units are suspended from in the field – no other connection accessories are required.
  • The AquaVent communication connection is made from the App Interface to the AquaVent Wellhead using an App Connector Cable that is ordered separately.
The Levelogger App Interface is portable hardware that connects to the top of your Levelogger via a Direct Read Cable/Adaptor, to a LevelVent Wellhead, or to an AquaVent Wellhead cable. Bluetooth wireless technology allows communication between the Levelogger App Interface and the smart device with the app installed. It allows viewing/downloading of data, and programming of Solinst dataloggers, as well as many other features.
Solinst offers a wide range of dataloggers that can be used with the Leveloggger App Interface. They include the complete, current Levelogger Edge range of units (Edge, Junior Edge, LTC Edge, Rainlogger Edge), previous Gold Leveloggers/Barologgers, and the latest vented datalogger editions, the AquaVent and LevelVent.
  • Program and start dataloggers in the field.
  • Simplify data management in the field by transporting and using less equipment.
  • View real-time readings.
  • Download and e-mail logged data files.
  • Calibrate LTC Leveloggers (NEW).
  • Run the diagnostic utility (NEW) – used for troubleshooting

Leveloggers. Provides detailed information on the datalogger,
and includes options for running a self-test, doing a memory
dump and creating/emailing reports.

Follow these links to some step by step tutorials from Solinst to ensure your USB driver is installed correctly: Windows 7, Windows 8, Windows 10
The most recent version of the Android App available is 1.2.5 but that is only available for download if your Android device has Android version 8 (oreo) or above. That means, any device running older Android versions can not download the most recent App-This is a restriction that Google has set.