General catalog - Bronkhorst - #3

Bronkhorst High-Tech Mass Flow Meters/Controllers are available in the widest range offered on the market with flows from 0...1 ml_n/min up to 0...400 m³_n/h and from low operating pressures (vacuum) up to 700 bar. Bronkhorst High-Tech Mass Flow Controllers excel in:

♦ stability

♦ maintainability

♦ quality

The unique control valve is modular in construction and therefore user replaceable. For analytical applications, Bronkhorst High-Tech EL-FLOW MFC's have been used for control of gases such as Hydrogen, Helium, Argon and Oxygen, and flow meters of our LOW-AP-FLOW series have been used for environmental and pollution monitoring. Both series are available with analog and digital in-/output. The digital instruments have a basic pc-board, containing all of the general functions needed for measurement and control. In addition to the standard RS-232 output the instruments also offer analog I/O. Furthermore, an integrated interface board provides DeviceNet™, PROFIBUS-DP®, Modbus or FLOW-BUS protocols. The latter is a fieldbus based RS-485, specifically designed by Bronkhorst High-Tech for their mass flow metering and control solutions, and with which the company already has over ten years of experience with digital communication.

Digital Mass Flow Controller for gases, model F-201CV

Bronkhorst High-Tech offers Mass Flow Meters and Controllers for liquids in ranges between 0 ... 30 mg/h (0 ... 500 nanolitres per minute!) and 0 ... 20 kg/h (water equivalent). The LIQUI-FLOW® Series are compact instruments only requiring a small differential pressure. Furthermore, the LIQUI-FLOW Series feature:

♦ fast and accurate measuring signal;

♦ insensitivity to mounting position;

♦ very small internal volume.

In parallel with the mass flow controllers for gases, LIQUI-FLOW instruments are available with analog (0 - 5/10 Vdc or 0/4 - 20 mA) and digital (RS232) communication, with optional on-board fieldbus interface to PROFIBUS-DP®, DeviceNetTM, Modbus or FLOW-BUS.

Digital Mass Flow Controller for liquids, model L13V02

Flow control is achieved by integrating a control valve onto the body of the liquid flow meter. This control valve has a purge connection on top of the sleeve that enables easy elimination of air or gas when starting up the system. The electronic control function forms part of the normal circuitry in the liquid flow meter, so the need for an external controller is eliminated.

LIQUI-FLOW is used in analytical applications in combination with HPLC pumps, verifying the pump performance or even close-coupled with a pump, accepting analog or digital signals defining the required mass flow rate. Furthermore LIQUI-FLOW is used for generating gaseous mixtures with very small, very precise concentrations of vapour. These test gases can be used for calibrating gas chromatographs or mass spectrometers (moisture analysis).

detector

solvent reservo r

HPLC pump

HPLC column

column I \ heater j_

liquid mass flow meter/controller

HPLC injection valve

process sample in

process sample out

Liquid flow control in HPLC system