How to fix no (fieldbus) communication on BRONKHORST Measuring Instruments?
If your BRONKHORST Measuring Instruments show no (fieldbus) communication, first check the power supply. If the power supply is working, check and change the node address. If the problem persists, reset the instrument and/or restart the master. If the issue still continues, contact Bronkhorst.
What to do if BRONKHORST Measuring Instruments have no output signal?
If your BRONKHORST Measuring Instruments have no output signal, first check the power supply. If the power supply is fine, then check if the control mode is valid. Also, verify that the control valve is not in a safe state. Ensure that the inlet pressure or differential pressure is not too low by increasing the inlet pressure. If the piping, filters, or control valve are clogged or blocked, flush the fluid system with clean, dry air. If the problem persists, contact Bronkhorst. If you suspect the laminar flow element or sensor has failed, return the equipment to the factory.
Why is the measured value lower than setpoint on BRONKHORST Measuring Instruments?
If the measured value or output signal of your BRONKHORST Measuring Instruments is much lower than the setpoint, first ensure that the inlet pressure or differential pressure is not too low; increase it if necessary. Check for process gas condensation by decreasing the inlet pressure or increasing the gas temperature. If the piping, filters, or control valve are clogged or blocked, flush the fluid system with clean, dry air. Finally, verify that the supplied fluid type matches the configured fluid type; if not, either supply the correct fluid or change the fluid type in the instrument configuration.
What to do if measured value never reaches setpoint on BRONKHORST Measuring Instruments?
If the measured value rises but never reaches the setpoint on your BRONKHORST Measuring Instruments, start by flushing the fluid system with clean, dry air to clear any blockages in the piping, filters, or control valve. If the problem persists, contact Bronkhorst. Increase the inlet pressure if it is too low. Check and decrease the outlet pressure if it is too high. Also, check the process outlet and downstream piping to ensure they are not blocked.
Why is control behavior unstable in BRONKHORST Measuring Instruments?
If the control behavior of your BRONKHORST Measuring Instruments is unstable, first check if the measurement is disturbed by vibrations and, if possible, avoid installation in close proximity to mechanical vibration. If the inlet pressure is unstable, install a pressure regulator or increase the buffer volume between controlling instruments. Ensure that the inlet and/or outlet pressure is neither too high nor too low, adjusting the pressure and/or setting the instrument pressure in accordance with the actual process pressure. Verify that the correct process gas is selected and that the controller settings are correct. If you suspect the control valve is damaged, return the equipment to the factory.
Why no flow when sending setpoint to BRONKHORST Measuring Instruments?
If there is no flow when sending a setpoint to your BRONKHORST Measuring Instruments, first check the upstream components for obstructions in the fluid lines, valves, and filters. Then, verify that the inlet pressure is within the specified bounds.
Why continuous maximum measured value on BRONKHORST Measuring Instruments?
If your BRONKHORST Measuring Instruments show a continuous maximum measured value or output signal, first check the inlet pressure. If the inlet pressure is too high, adjust it accordingly. Ensure the valve is not fully open; if it is, close it. If the issue persists, the sensor may have failed, requiring the equipment to be returned to the factory.
What to do if BRONKHORST Measuring Instruments indicate flow when there is none?
If your BRONKHORST Measuring Instruments indicate a flow when there is none, check the system for leakage, and follow vendor instructions when installing third-party components such as adapters, tubing, and valves.
Covers EL-FLOW® Select series, product info, installation, operation, troubleshooting.
Designed to accurately measure and/or control gas flow rates in a fluid system.
Based on thermal bypass principle, modular construction, laboratory style housing.
Factory calibrated; periodical inspection may be required. Standards traceable to VSL.
Needs no regular maintenance if operated properly. Contact representative for servicing.
Lists available documentation for operation/maintenance, downloadable from website.
Serial number label contains technical properties. Properties retrieved via diagrams.
Lists compatibility of internal seals with gases. Check model key for specific instrument.
Check serial number label for flow rate, media, pressure, temperature, valve type, signals.
Details test pressure, rapid gas decompression, and ambient conditions for safe operation.
Guidelines for optimal performance: upright position, avoid vibration/heat. Use threaded holes.
Ensure clean stream, use filters. Use suitable piping. Avoid abrupt angles and regulators.
Install in line with flow arrow. Use Swagelok adapters. Check for leaks before operation.
Use standard cables. Ensure power supply suitability. Protect against ESD and polarity reversal.
Connect via fieldbus interface or RS485. Avoid powering from two sources simultaneously.
Details D-sub interfaces (Analog, Digital) and optional fieldbus interfaces.
Recommend powering on before fluid pressure. Allow 30 min for warm-up.
Purging necessary for corrosive/reactive media. Adjust zero point if mounted in vertical flow.
Instrument ready after startup. Optimal accuracy after warm-up. Controls valve based on setpoint.
Valve returns to closed (n/c) or open (n/o) when unpowered. Certain events trigger Safe State.
Instrument has LEDs and a multifunctional switch for visual monitoring and manual functions.
Lists supported communication modes: Analog, Digital RS232/RS485, and fieldbus options.
Procedure to re-adjust zero point via switch or digital communication due to ambient changes.
Describes commonly used parameters for digital operation, grouped by type, access, and range.
Details parameters like Init Reset, Reset, Wink, and Control Mode for configuration.
Covers parameters for Measure, Setpoint, Temperature, and Pressure.
Parameters for identifying the instrument: User Tag, Model, Serial Number, Firmware Version.
Covers alarm modes, info, limits, and reset methods for system monitoring.
Settings for counter mode, unit, value, limit, and setpoint change upon limit.
Shows default settings for Address, Baud Rate, Parity for various protocols.
Parameters for selecting and configuring fluids, capacity, and units.
Sets up master/slave relationships and factors in FLOW-BUS systems.
Explains LED indications and error info sources for diagnosing issues.
Procedure to reset instrument to pre-configured factory settings using multifunctional switch.
Provides troubleshooting steps for communication, output signal, control behavior, and flow issues.
Information on Bronkhorst website, sales and customer service contact details for support.
Instructions for handling and packaging instruments for return, including documentation.
Information on WEEE directive and proper disposal of electrical/electronic equipment.
General| Accuracy | ± 0.5% Rd plus ± 0.1% FS |
|---|---|
| Power Supply | 15...24 VDC |
| Communication Protocol | RS-232, DeviceNet, Profibus, EtherCAT, Modbus, FLOW-BUS |
| Operating Pressure | 10 bar |
| Material (wetted parts) | Stainless steel, Hastelloy |
| Output Signal | Analog (0...5 V, 0...10 V, 4...20 mA) |
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