The VS-pro series of vacuum systems from UMS are capable of applying a constant or tension-controlled vacuum for long-term monitoring projects.  Keyboard display allows for status checks and configuration without hooking it up to your PC. 

The Constant Vacuum Method

The constant vacuum method is continuously maintained by a regulated vacuum pump. The vacuum can be set between atmospheric pressure and 85 kPa. 

Tension Controlled Extraction

A tensiometer measures the soil water tension.  The programmable vacuum station VS automatically supplies a vacuum in correspondence to the measured tension.  Due to the numerous functions of the unit an optimal adaptation to the sampling task is possible.

Applications

Long term monitoring 
Defined pore water sampling
Defined leachate measurements
Lysimeter sites
Tension controlled sampling

Benefits

LCD Display and keypad for basic status check and configuration
Continuous display of readings and status on the LCD
LCD backlight and multicolor LED
High accuracy vacuum pump
Two vacuum outputs
Selectable constant or tension controlled vacuum
Optimized for use with batteries or they can be hardwired and plugged into your power supply.
Option for tensiometer input: T8, T4, or T5
Multiple configuration options 
Integrated datalogger