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What to consider when choosing instruments for signal conversion and indication
Here’s how Fagerberg improves the everyday for the process industry.
Do you need to convert a measurement signal, display a measured value or perform calculations based on process data? The right instrument depends on the signal type, the functions you need and how the equipment will connect to other systems.
Here, we guide you through the key factors to consider and provide an overview of different solutions for signal conversion and indication.
1. Start with how the signal will be used
Does the measured value need to be transmitted to a control system, displayed locally or used for applications such as flow calculations and dosing? Signal converters adapt signals between sensors and receiving systems, indicators display measured values, and flow computers are used for flow calculations and monitoring.
2. What type of signal do you have?
Analogue signals such as 4–20 mA and 0–10 V are common in the process industry. Temperature sensors may instead provide resistance or voltage signals, while flowmeters can also use pulse signals. The instrument's inputs and outputs must therefore be compatible with both the sensor and the receiving system.
3. Do you need signal conversion or isolation?
A signal converter can convert a temperature sensor signal into a standardised output signal, for example. Galvanic isolation electrically separates circuits to reduce the risk of interference and problems caused by differences in electrical potential. The requirements depend on the installation and how the signals will be transmitted.
4. Which functions do you need?
For some applications, displaying the current measured value is sufficient. Others require alarm limits, totalisation, relay outputs or calculations with pressure and temperature compensation. Starting with the functions you need makes it easier to select the right type of instrument.
5. Consider installation and process conditions
Power supply, mounting, connections and ambient temperature all influence the choice of instrument. Installations in hazardous areas or safety-related systems may also require specific approvals and functional safety features. Accessibility for configuration and maintenance should also be considered.
6. Which type of instrument is right for your application?
A brief overview of our different product categories.
Signal converters
Convert signals from instruments such as temperature sensors into standardised output signals for control and monitoring. Available with different input types, communication options and functions for signal conditioning and isolation.
Indicators and displays
Display measured values locally and, depending on the model, can also provide alarms, totalisation and other functions. Suitable when process data needs to be read directly at the installation.
Flow computers
Used to calculate and process flow data from connected measuring instruments. They can handle volumetric and mass flow, totalisation and compensation for changing process conditions.
The most suitable solution depends on the signal type, the functions required and how the instrument will be used in your process.