- Official UK and Ireland channel partner
- UK technical support available
- Model selection and configuration support
OMEGA FLR1600/FLV4600 Low-Flow Liquid Meters and Controllers
Choose measurement-only or closed-loop control for low flows of pure, clean DI or distilled water.
Key highlights
- Function: FLR measures; FLV regulates flow
- Medium: Pure, clean DI or distilled water
- Family ranges: FLR to 10 L/min; FLV to 5 L/min
- Performance: ±2% FS accuracy; 50:1 turndown
- Interfaces: LCD, analogue and serial connectivity
OMEGA FLR1600 and FLV4600 are paired low-flow water instrument families built around differential-pressure measurement across a laminar flow element. They provide a consistent platform for applications that need either measurement alone or automatic regulation.
FLR-1600A models measure volumetric flow and provide local indication of flow and temperature. Analogue and serial signals allow measured values to be passed to compatible control, recording or data-acquisition equipment, while an optional pressure sensor can provide an additional measured parameter.
FLV-4600A models add closed-loop control. An integral normally closed proportional valve and PID loop compare the measured flow with the selected setpoint and adjust the valve to regulate the process. Valve size, available pressure, back pressure and power requirements must be considered with the required range.
The measurement principle depends on the known temperature-viscosity relationship of water. Media selection is therefore deliberately narrow: pure, clean DI or distilled water only. Tap water, minerals, oils, biological contamination and viscosity-changing additives are outside the verified application envelope.
FLR standard full-scale ranges extend from 0.5 mL/min to 10 L/min, while FLV standard control ranges extend from 50 mL/min to 5 L/min. Final selection should account for function, full-scale range, valve size, pressure drop, filtration, process connection, mounting, supply and the required analogue or serial interface.
Key Features
- Laminar measurement: Differential pressure across a fixed flow element provides a linear volumetric-flow response without moving sensing parts
- Measurement-only option: FLR-1600A reports water flow and temperature without an integral control valve
- Closed-loop option: FLV-4600A combines the flowmeter with a normally closed proportional valve and PID regulation
- Local interface: Integrated display and touchpad show process values and support device setup
- Fast response: Typical adjustable response is 20 ms for meters and 100 ms for controllers
- Signal choice: Select standard 0-5 VDC and RS-232 or compatible analogue, secondary-output and RS-485 options
- Range-matched hardware: Process connection, pressure drop, body size and controller valve depend on the selected full-scale range
- Useful options: Pressure sensing, totalisation and portable FLR configurations are available subject to model compatibility
Specifications
| Family and Function | |
| Series included | FLR-1600A low-flow water meters and FLV-4600A low-flow water controllers |
| FLR function | Volumetric-flow measurement and local indication; no integral control valve |
| FLV function | Volumetric-flow measurement with integral normally closed proportional valve and PID setpoint control |
| Measurement principle | Differential pressure across a laminar flow element, compensated using measured water temperature and the established viscosity relationship for water |
| Permitted medium | Pure, clean deionised or distilled water only |
| Displayed parameters | Flow and temperature; pressure with the applicable optional sensor |
| Flow and Performance | |
| FLR meter ranges | Standard full-scale ranges from 0.5 mL/min to 10 L/min |
| FLV controller ranges | Standard full-scale ranges from 50 mL/min to 5 L/min |
| Accuracy | ±2% of full scale after tare at calibration conditions |
| Repeatability | ±2% of full scale |
| Operating range | 2-100% of full scale; 50:1 typical turndown |
| Typical response | FLR: 20 ms; FLV: 100 ms; adjustable |
| Over-range indication | FLR measurable to 128% of full scale |
| Controller maximum | FLV controllable to 102.4% of full scale |
| Pressure, Temperature and Media | |
| Operating temperature | 10 to 50°C |
| Maximum operating line pressure | 100 psig (689 kPa) |
| Pressure drop | Model-dependent; 2-20 psid at full-scale flow in the published range tables |
| Source pressure | Greater than the selected instrument pressure drop plus downstream back pressure; stable source pressure required |
| Upstream filtration | 20 µm for full-scale ranges of 100 mL/min or less; 40 µm above 100 mL/min |
| FLR wetted materials | 302 and 303 stainless steel, 316L stainless steel and FKM |
| FLV wetted materials | 430FR, 302 and 303 stainless steel, 316L stainless steel, FKM and perfluoroelastomer; large-valve models also add 416 stainless steel and POM |
| Control, Signals and Power | |
| FLV valve | Integral normally closed proportional valve; small- or large-valve construction according to range |
| FLV setpoint input | 0-5 VDC or RS- 232 as standard; alternative analogue or RS-485 configurations according to the ordered model |
| Standard output | 0-5 VDC analogue output and RS-232 serial communications |
| Optional signals | 4-20 mA, 0-10 VDC, secondary analogue output and RS-485 in place of RS-232; parameter mapping and compatibility are model-dependent |
| FLR supply | 7-30 VDC; 15-30 VDC with a 4-20 mA output |
| Small-valve FLV supply | 12-30 VDC; 15-30 VDC with a 4-20 mA output |
| Large-valve FLV supply | 24-30 VDC |
| Electrical connection | 8-pin mini-DIN standard; DB15 configurations require confirmation |
| Process Connections and Mounting | |
| Process connections | M5 (10-32), 1/8-inch female NPT or 1/4-inch female NPT according to range and model |
| Flow direction | Normal operation is unidirectional in the direction marked on the instrument |
| FLR mounting | Position-insensitive; mounting holes provided for flat-panel installation |
| Small-valve FLV mounting | Normally suitable for mounting in any orientation |
| Large-valve FLV mounting | Valve cylinder vertical and upright |
| Ingress protection | IP40 |
| Options | |
| Measured parameters | Optional pressure sensor and secondary analogue output |
| Communications | RS-485 in place of standard RS-232 |
| Totalisation | Six-digit totaliser option with specified resolution |
| Portable meter | Battery-powered FLR configuration; not available with the 4-20 mA output option |
| Compliance | |
| Manufacturer listings | CE and UKCA; RoHS 2015/863 declaration available for FLR1600-Series |
Support
Able Instruments are an official UK and Ireland channel partner for DwyerOmega, providing application advice, configuration support and quotation assistance for the OMEGA FLR1600 and FLV4600 low-flow liquid family.
- Model selection: Support matching measurement-only FLR or closed-loop FLV operation to the required full-scale range and process connection
- Option compatibility: Checks for valve size, analogue signals, serial interface, pressure sensor, totaliser, portable version and supply requirements
- Installation support: Advice on water quality, filtration, pressure drop, back pressure, mounting, connections and electrical interfacing
- Documentation support: Help with the datasheet, operating manual, calibration record, signal pin-out and replacement requirements
Accessories
- FMA1600-C1 replacement 1.8 m single-ended mini-DIN cable
- FMA1600-C3 mini-DIN-to-DB9 serial cable
- FMA1600-PSU universal 24 VDC power supply adaptor
- FMA1600-MDB multi-drop box