VSU20

Automatic formic acid refill is available for VSU20/VSU28. If the level of formic acid in bubbler drops below certain level the system pumps formic acid from a container bottle. Container bottle is placed in a ventilated box in the rack. The bottle can be up to 2L in volume.

Auto refill option enables equal amount of formic acid on every process run. It is also very comfortable if the VSU system is used for production purposes where larger amount of formic acid is required.

Formic acid auto refill diagram (PDF)

An additional line is used for Helium, Argon, Nitrogen or other gas. It can be equipped with digital flowmeter or with needle valve.

1. Digital flowmeter is placed on the front panel like the other gas lines.

2. If needle valve is chosen the flow rate is adjusted from the back panel where valve is placed.

Note that if used for Helium the digital flowmeter readout will differ from the actual flow rate. The flowmeter can be setup for Air, N₂, Ar or CO₂

VSU20/VSU28 has standard build-in pressure transmitter. This transmitter is linear and measures from 0 to 1.6 bar abs (for VSU28 with overpressure capability up to 6bar abs) According to transmitter's manufacturer accuracy is 0.5% of its full scale. Therefore measurement below 5mbar could be inaccurate.

In addition to the pressure transmitter we offer full scale vacuum gauge for pressure from 5x10-4 mbar abs to atmospheric pressure. This gauge is placed outside the machine body and is easy for calibration and maintenance.

Signal indication is offered in three kinds for VSU20/VSU28

1. Buzzer only (default) Buzzer is placed on the front of the VSU20/VSU28 panel.

2. Buzzer + Green light on the top of the display pole.

3. Buzzer + Green + Amber + Red light on the top of the display pole.

Signal indication diagram (PDF)

Though VSU20 is a bench-top oven we offer a mounting rack for the device. The rack is equipped with four rollers for easy movement and four foots with adjustable height that enable easy leveling and stable operation.

1. Dry pump with pumping rate 15m³/h and ultimate vacuum 5x10^-2mbar

2. Diaphragm pump with pumping rate 6m³/h and ultimate vacuum <8mbar

3. Rotary vane pump with pumping rate 5m³/h and ultimate vacuum 2x10^-3mbar