Introduction
Ukrainian industrial enterprises face a critical need for improving energy efficiency and reducing operational costs. Most technological lines built in the last century still use analog devices for pressure, temperature, and flow control. Such systems transmit signals of 4-20 mA or 0-10 V, which are susceptible to electromagnetic interference, zero drift, and require regular manual calibration.
Old equipment generates measurement errors up to 2.5%, which prevents accurate compliance with technological regulations according to the requirements of DSTU EN ISO 9001.. Modernization of measuring and control instruments and automation (MCI&A) allows integrating enterprises into a single digital environment, minimizing unplanned stoppages and fulfilling requirements of European directives on energy efficiency (Ecodesign Directive).
Evaluation of obsolete systems
Before making a decision on replacing the technical equipment, the chief engineer must conduct an audit of the existing equipment. Evaluation criteria include metrological characteristics, condition of cable lines and availability of spare parts.
| Evaluation Criterion | Analog system (legacy) | Digital system (modern) |
|---|---|---|
| Measurement error | ±1.0% – ±2.5% | ±0.075% – ±0.1% |
| Response time (t90) | 500 – 1200 ms | 50 – 150 ms |
| Condition Monitoring | Missing (only loop check) | Constant (HART, IO-Link, Profibus) |
| Interchange interval | 1 year | 3 – 5 years |
| Vibration resistance | Low (mechanical wear) | High (hardness sensors) |
Modern Alternatives and Technological Comparison
Transition to digital instrumentation is based on the use of intelligent sensors with digital communication protocols. For example, the modern pressure sensor Bosch 0608750057 provides measurement stability up to 600 bar with digital compensation for ambient temperature from -40°C to +125°C.
- Датчики тиску: Заміна манометрів Бурдона та старих тензорезистивних датчиків на прилади з протоколом HART та ступенем захисту IP67/IP69K.
- Temperature sensors: Use of Pt100 resistance temperature detectors with integrated converters and digital output instead of directly connected thermocouples.
- Витратоміри: Встановлення електромагнітних та коіолісових витратомірів з похибкою не більше 0.2% замість застарілих діафрагм з дифманометрами.
Calculation of investment profitability (ROI)
The argument "old equipment still works" often leads to hidden financial losses. Let's consider the economic effect using an example of a cement or chemical industry company with 50 pressure and flow measurement points.
«The cost of continuous production downtime in Ukraine averages 450 000 UAH per hour. Reduction in the number of false trips and blockages occupies the cost of modernization during the first year of operation.»
Input data for calculation:
- Number of measurement points: 50 units.
- Cost of the digital replacement set (including Bosch sensor type 0608750057, cables, and setup): 15 000 euros.
- Planned calibration costs for the old park (working day, labor cost, dismantling): 300 euros per point annually = 15 000 euros/year.
- Material losses due to dosing error (±2% instead of ±0.1%): 35 000 euros/year.
- Frequency of emergency stops due to failure of analog-to-digital converter analog boards: 3 stops per year each for 4 hours. Losses: 3 × 4 × 11 000 euros (approximately 450 000 грн) = 132 000 euros/year.
General annual losses from operating the old system: 15 000 + 35 000 + 132 000 = 182 000 euros per year.
Occupancy Term (Payback Period):
Investments / (Annual costs old - Annual costs new) = 15 000 / 182 000 = 0.08 year (approximately 30 days).
Implementation Roadmap
In order to avoid production process stoppages, modernization is carried out in stages during planned short-term shutdowns (maintenance window).
- Stage 1: Audit and Engineering (Weeks 1-2). Identification of threaded connections, electrical characteristics of power supply (24 VDC), checking compatibility with existing PLCs (Siemens, Schneider Electric).
- Stage 2: Equipment Supply (Weeks 3-4). Order configuration through UNITEC-D E-Catalog, verification of CE certificates and compliance with UkrSEPRO standards.
- Stage 3: Installation and Wiring (Week 5). Disassembly of old devices, installation of new adapters and digital sensors, laying of shielded cable in accordance with the requirements EN 50174.
- Stage 4: PNR and calibration (Week 6). Configuration via manufacturer's software, data transmission check to upper SCADA level, signing of test protocols.
Technical challenges and ways to resolve them
During the transition to digital instrumentation, engineers face certain limitations on the construction site:
- Mismatched connection sizes: This is resolved by manufacturing adapters and fittings from stainless steel 1.4404 (AISI 316L) according to the customer's drawings.
- Electromagnetic Interferences in Workshops: Use exclusively cables with twisted pairs and overall copper shielding, grounded on one side in accordance with EN 60204-1.
- Capital Expenditure (Capex) Budget Constraints: Stepwise replacement of critical nodes (prioritization agreement using FMEA methodology). UNITEC-D supplies both state-of-the-art components and time-tested alternatives for gradual migration.
UNITEC-D GmbH provides full technical support to Ukrainian companies in selecting replacement equipment for discontinued machinery, guaranteeing compliance with European quality standards.
Conclusion
Transition from analog sensors to digital measurement systems for pressure, temperature and flow is a necessary step to ensure competitiveness of Ukrainian manufacturing. Investments in modern components are recouped due to reduced energy consumption, absence of emergency stoppages and reduction in maintenance costs. Use the catalog UNITEC-D E-Catalog for selection of certified components and organization of fast delivery to Ukraine.
Reference
- DSSTU EN 60204-1:2015 Safety of machinery. Electrical equipment of machines and mechanisms.
- ISO 5167 Measurement of liquid and gas flow rates using variable area devices.
- Directive 2009/125/EC of the European Union concerning ecodesign requirements for energy-related products.
- Technical documentation from the manufacturer: Bosch Rexroth / Industrial Hydraulics - Instrumentation Guide.
