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Bronkhorst - Model LIQUI-FLOW L23V12 -Digital Thermal Liquid Mass Flow Controller
Bronkhorst model L23V12 Liquid Flow Controllers (LFCs) are suited for precise measurement and control of flow ranges between 2…100 g/h and 20...1000 g/h at operating pressures up to 100 bar. The LFC consists of a thermal mass flow sensor and a microprocessor based pc-board with signal and fieldbus conversion and a PID controller for mass flow control by means of an integrated control valve. IQUI-FLOW™ series are equipped with a digital pc-board, offering high accuracy, excellent temperature stability and fast response. The main digital pc-board contains all of the general functions needed for measurement and control. In addition to the standard RS232 output the instruments also offer analog I/O. As an option, an on-board interface can be mounted to provide CANopen, DeviceNet™, EtherCAT®, PROFIBUS DP, PROFINET, Modbus RTU, ASCII or TCP/IP, EtherNet/IP, POWERLINK or FLOW-BUS protocols.
- Fast and accurate measurement
- No moving parts
- Thru-Flow measurement
- Suitable for liquids with low boiling point
- Attitude insensitive
- Very small internal volume
- In combination with a control valve: continuous and stable control
- Analog or digital: RS232, Profibus-DP®, DeviceNet™ or Modbus
Flow control is achieved by integrating a control valve onto the body of the Liquid Flow Meter. This control valve has a purge connection to eliminate air or gas during start-up. The electronic control function forms part of the normal circuitry in the meter. Alternatively the liquid flow can be controlled using a close-coupled pump.
- Semiconductor industry
- Pharmaceutical industry
- Food industry (flavors, additives)
- Biotechnical industry
- Analytical laboratories
- HPLC-applications
Measurement / control system
- Flow range (intermediate ranges available) : min. 2…100 g/h
- max. 20…1000 g/h (based on H2O)
- Accuracy (incl. linearity) (based on actual calibration) : ± 1 % FS
- Repeatability : < 0,2 % FS (typical H2O)
- Turndown ratio : 1:50 (2…100%)
- Settling time (in control, typical) : < 2 sec.
- Operating temperature : 5 … 50 °C
- Temperature sensitivity : ± 0,1% FS/°C
- Max. Kv-value : 2,37x10-3
- Max. fluid viscosity : 0,1 Pa*s
- Attitude sensitivity : negligible
- Warm-up time : 30 min. for optimum accuracy;
- 2 min for accuracy ± 2% FS
Mechanical parts
- Material (wetted parts) : stainless steel 316L/320
- Pressure rating (PN) : 100 bar abs
- Max. ΔP : 10 bar dif.
- Process connections : compression type or face seal (VCR/VCO) couplings
- Purge connection : 1/16” OD compression type
- Seals : FFKM/Kalrez ; other on request
- Ingress protection : IP40
Electrical connection
- Analog/RS232 : 9-pin D-connector (male)
- PROFIBUS DP : bus: 9-pin D-connector (female);
- power: 9-pin D-connector (male)
- CANopen / DeviceNet™ : 5-pin M12-connector (male)
- EtherCAT : 2 x RJ45 modular jack (in/out)
- FLOW-BUS/Modbus-RTU/ASCII : RJ45 modular jack
- Modbus TCP / EtherNet/IP / POWERLINK : 2 x RJ45 modular jack (in/out);