Process Instrumentation for Accurate Measurement and Process Control
Process instrumentation is used when you need to continuously monitor and control pressure, level, flow, temperature or pH in your installation. Whether you work in the food industry, the chemical sector or water treatment: without reliable measurements, you are operating blind. With the right sensors, transmitters and control valves, you keep process conditions under control, meet safety requirements and prevent costly downtime.
Ebora supplies process instrumentation for industrial applications, including hygienic versions for food and pharma.
When do you use process instrumentation?
Process instrumentation is essential whenever critical process variables affect product quality, safety or efficiency. Examples:
- You need to detect overpressure in a pipe or vessel before damage occurs
- You monitor the liquid level in a tank to prevent overflow or running dry
- You measure the flow rate of a medium for accurate dosing or billing
- You record temperatures in production processes where deviations lead to rejected batches
- You monitor the pH value in a cleaning or production line
Select process instrumentation based on the medium, required accuracy and environmental conditions.
Pressure measurement – monitoring overpressure and process pressure
A pressure sensor or pressure transmitter converts the pressure in a pipe or vessel into an electrical signal that your PLC or control system can process. Applications range from gauge pressure in water installations to differential pressure for filter monitoring and overpressure protection in steam lines.
Key selection criteria:
- Measuring range (bar or mbar)
- Process connection (threaded, flanged or hygienic)
- Version (stainless steel, for aggressive media or food applications)
Level measurement – prevent overflow and dry running
Level measurement determines the liquid height in tanks, reactors or buffer vessels. Depending on the medium and the installation, you choose radar, hydrostatic pressure, conductivity measurement or the float principle.
- Clean liquids, non-foaming ? radar or hydrostatic
- Foaming or viscous media ? guided radar or capacitive
- Simple on/off signalling ? float or vibrating fork
Flow measurement – measuring and controlling flow rate
A flow meter measures the volumetric or mass flow rate of liquids or gases. The right measuring principle depends on the medium and the required accuracy.
- Clean liquids, high accuracy ? electromagnetic or Coriolis
- Gas or steam ? vortex or thermal mass flow meter
- Cooling or irrigation water, lower accuracy ? rotameter or turbine wheel
Flow meters are also used for leak detection in piping systems: a constant difference between two measurement points indicates a leak.
Temperature and pH measurement
Temperature sensors (PT100, PT1000, thermocouple) monitor process conditions in heat exchangers, pasteurisers and reactors. pH electrodes are used in cleaning installations (CIP), chemical processes and water treatment. Both sensor types deliver signals that are sent to your control system via a transmitter.
Use this type when deviating process temperatures directly lead to product loss or safety risks.
How does a transmitter work in a process chain?
A transmitter takes the raw measurement signal from a sensor and converts it into a standardised output: 4–20 mA, 0–10 V or digital via HART, Modbus or Profibus. This signal is directly readable by PLCs, DCS systems and SCADA environments.
The process chain works as follows:
- Sensor (primary measuring element) – measures the physical variable directly in the process
- Transmitter – converts the signal into a standard process value
- Control valve or actuator – controls a control valve or solenoid valve based on the signal
A well-tuned process chain minimises measurement and control errors and extends the service life of your installation.
Selection guide – which measuring principle suits your application?
| Application |
Recommended type |
Note |
| Pressure in steam line |
Stainless steel pressure transmitter |
Check temperature resistance |
| Level in aggressive medium |
Radar or guided radar |
No contact with medium required |
| Flow of clean liquid |
Electromagnetic |
High accuracy, no moving parts |
| Flow of gas or steam |
Vortex flow meter |
Suitable for high temperatures |
| pH in cleaning line |
pH electrode + transmitter |
Regular calibration required |
| Temperature in pasteuriser |
PT100 or PT1000 |
Hygienic process connection |
Process instrumentation in the food and chemical industry
The food industry imposes strict requirements on hygiene and cleaning. Instruments must withstand CIP and SIP cleaning, be made of stainless steel 316L or PEEK, and be certified for contact with foodstuffs. In the chemical industry, resistance to aggressive media, high pressures and corrosive liquids is the priority.
Choose this version when your installation is cleaned periodically or when your medium must be suitable for aggressive or food-grade applications.
Hengesbach – hygienic instrumentation in stainless steel
As a distributor of Hengesbach Prozessmesstechnik in the Netherlands, Ebora supplies pressure, level, temperature and flow sensors in fully hygienic stainless steel versions. Hengesbach instruments are specifically developed for food, pharma and biotechnology applications, with connections according to DIN 11851, Tri-Clamp and other hygienic standards.
ATEX-rated instrumentation for hazardous areas
In environments with explosion risk — such as solvent storage tanks, gas processing installations or paint production facilities — process instruments with ATEX certification are mandatory. ATEX instruments are designed not to act as an ignition source in atmospheres containing flammable gases, vapours or dust.
Note when selecting: always request the ATEX category, gas group and temperature class before selecting an instrument for a hazardous zone.
Frequently asked questions
What is the difference between a sensor and a transmitter?
A sensor measures a physical quantity directly in the process — such as pressure or temperature — and delivers a raw electrical value. A transmitter converts this raw signal into a standardised output (4–20 mA or digital) that your PLC or control system can process directly. In practice, sensor and transmitter are often combined in a single housing.
How often do field instruments need to be calibrated?
The calibration interval depends on the measuring principle, process conditions and required accuracy. For pressure and temperature instruments in food applications, an interval of 6 to 12 months is typical. pH electrodes require more frequent checks, depending on process load. Record calibration intervals in your maintenance system based on your certification requirements (ISO, HACCP).
Can I combine process instrumentation with pneumatic control valves?
Yes. A transmitter sends the measurement signal to a PLC, which controls a control valve via an I/P converter or direct actuation. Pneumatic actuators are frequently combined with pressure or flow sensors in closed control loops for pressure, level and flow control.
Which process connection should I choose for hygienic applications?
For food and pharma applications, choose connections according to DIN 11851, Tri-Clamp or SMS standard. These connections are smooth-bore, easy to clean and resistant to CIP and SIP processes. Hengesbach supplies instruments in these versions as standard.
Select the right process instrumentation based on medium, pressure range, temperature and accuracy requirements — or request a technical consultation via the contact form.
