First, know which production type you are
Almost every monitoring mistake starts by importing another environment's playbook. The four production types lose time differently, so they instrument differently:
| Discrete line | Job shop | Continuous process | Batch process | |
|---|---|---|---|---|
| Examples | Bottling, packaging, assembly | CNC machining, fabrication, tool & die | Cement, paper, glass, extrusion | Chemicals, brewing, pharma, cooking |
| Where time dies | Short stops, changeovers, jams | Idle spindles, setup, waiting for work | Rate losses and rare, huge stoppages | Between steps: cleaning, transfers, QC holds |
| OEE fit | Textbook — count in, count out | Use utilisation first, OEE later | OEE on rate vs design capacity | OEE per batch step; schedule adherence |
| First signal to wire | Product counts + run state | Spindle/arc-on current per machine | Throughput rate + drive currents | Step start/stop times + temperatures |
| Condition-monitoring weight | Moderate — many small assets | Low–moderate — spindles, compressors | Dominant — few assets, huge stakes | Agitators, pumps, utilities |
Food & beverage — bottling, dairy, bakery, brewery, meat
South Africa's largest manufacturing sector runs on discrete lines with a process core: a bottling or canning line loses its OEE to micro-stops at the filler and labeller; a dairy adds CIP (clean-in-place) windows that quietly swallow availability; a bakery lives and dies on oven and proofer stability; breweries are batch upstream and discrete downstream; and meat and poultry plants layer cold-chain compliance on top of line efficiency. The environmental constraints are real: washdown chemicals and hose-down pressure demand IP-rated sensors, and the compliance layer — cold rooms, blast freezers, effluent to the municipal sewer — is monitored by the same platform that counts the line (see our cold chain and trade effluent pages). The classic first win: count-based OEE at the line constraint, which in most plants is the filler.
Packaging, printing & converting
Corrugators, flexo and litho presses, laminators, bag-making and label lines share one economic shape: the machine earns only at speed, and changeover plus web breaks are where the day disappears. Monitoring that matters here: run-rate versus rated speed per job, changeover clocking with reason codes, and waste counts at rewind. Because a converting plant's product changes hourly, the win is per-job OEE — which shift, which substrate, which job structure kills the rate — rather than a plant-wide average that hides everything. Our andon guide and shop-floor data collection cover the operator side that makes reason codes survive contact with reality.
Plastics — injection moulding, extrusion, blow moulding
An injection moulding hall is cycle-time arithmetic: every second added to a 30-second cycle across 20 machines is a machine's worth of capacity lost, so the monitoring core is cycle-time per machine per mould against standard, plus reject counts at the press. Extrusion behaves as continuous — melt pressure, barrel-zone temperatures and line speed are the signals. Blow moulding sits between. Plastics also carries a silent cost line worth instrumenting: energy per kilogram processed, since barrels, chillers and dryers make plastics one of the most electricity-intense discrete environments per rand of output — the same per-line energy measurement covered in our OEE solution.
Metal fabrication & machine shops
The job-shop trap: a CNC shop that quotes on machine-hours usually cannot say what fraction of paid hours the spindles actually cut. Spindle utilisation — measured from spindle load or current, no CNC integration required — is routinely a shock the first time it is graphed, and it reprices every quote the shop issues. Around it: setup-time capture per job, arc-on time for welding bays, press-stroke counting in fabrication, and compressor and dust-extraction health as the shared utilities everything depends on. This is the environment where our no-PLC monitoring approach earns its keep — many SA machine shops run machines spanning four decades, and current clamps do not care how old the machine is.
Automotive components
SA's component plants — stamping, welding assemblies, plastic trim, harnesses — inherit their monitoring from their customer contracts: OEE per line as a reportable number, stroke counts and die-protection on presses, weld-cell cycle times, and traceability the OEMs audit. The distinctive pressure is takt discipline: a component plant misses a shift's takt and pays for it in airfreight. Monitoring here is less about discovery and more about defensible numbers — the same "whoever holds the count holds the argument" logic that runs through our MES vs OEE analysis.
Cement, brick, glass & aggregates
Continuous heavy process: a kiln, a glass furnace or a crusher-mill train stops rarely, catastrophically and expensively — so the monitoring programme is condition monitoring. Vibration and temperature on the kiln drive, mill bearings, crusher shafts and ID fans; motor current signatures on everything large; and dust-siege protection for the instruments themselves. The OEE lens still applies, but as rate versus design capacity: a mill running 8% under rated throughput for a quarter is a stoppage nobody logged. Our bearing fault detection guide covers the failure physics; condition monitoring the delivery.
Agro-processing — sugar, grain & feed mills
Campaign industries: a sugar mill earns its year in a crushing season measured in weeks, which converts every hour of unplanned downtime into revenue that never comes back. Grain and feed mills run longer seasons with the same shape — hammer mills, pellet presses, elevators and conveyors, all rotating, all dusty, all monitorable by vibration and current. The campaign economics justify condition monitoring that would look premium in a year-round plant, because the repair window is the off-season and the failure window is never. Conveyor health — the artery of every mill — has its own guide: conveyor belt monitoring.
Pharmaceutical & cleanroom manufacturing
Pharma inverts the priority: the product is often small, but the environment is the compliance object — GMP environmental monitoring of cleanroom differential pressure, temperature, humidity and particle excursions, with an audit trail a regulator will read. Line OEE matters (packing lines especially, where serialisation slows everything), but the non-negotiable layer is continuous environmental records with alarm response times. It is the same telemetry discipline as our water-quality compliance work pointed at air instead of water: measure continuously, alarm on excursion, keep the record that survives an audit.
Chemicals & batch processing
Batch plants lose time between the steps the recipe names: transfers, cleaning validations, QC holds, waiting for a shared reactor. Step-level timestamping — when did each batch actually start and finish each stage, against standard — surfaces a schedule-adherence picture that machine-level sensors cannot see. On the asset side, agitator drives, transfer pumps, and the utilities (steam, chilled water, compressed air) carry the condition-monitoring weight; on the compliance side, effluent and emissions records mirror the trade effluent pattern.
Textiles, clothing & footwear (CMT)
The CMT environment is many small machines and many hands: monitoring is less about spindle physics and more about flow — pieces per hour per line against target, WIP piling between operations, and downtime reasons that are mostly upstream (waiting for cutting, waiting for trims). Simple count-based line monitoring plus an andon escalation covers most of the value; the compressed-air system and boiler are usually the only assets worth condition-monitoring individually.
The environment map on one table
| Environment | Dominant loss | First thing to instrument | Condition-monitoring focus | Environmental constraint |
|---|---|---|---|---|
| Bottling / canning | Micro-stops at filler & labeller | Counts + run state at the constraint | Filler drives, conveyors, compressors | Washdown — IP-rated everything |
| Dairy / brewery | CIP windows, batch waits | Step timestamps + line counts | Pumps, agitators, refrigeration | Hygiene zoning, CIP chemicals |
| Bakery / meat | Thermal stability, cold-chain breaks | Oven / cold-room temperatures | Refrigeration plant, ovens | Cold, wet, hygiene audits |
| Packaging / printing | Changeovers, web breaks | Rate vs rated speed, per job | Press drives, dryers | Solvent zones on some presses |
| Injection moulding | Cycle-time creep, rejects | Cycle time per machine per mould | Hydraulics, chillers, dryers | Energy intensity — meter it |
| CNC / machine shop | Idle spindles, setup | Spindle-on current per machine | Spindles, compressed air | Mixed machine ages — go PLC-free |
| Automotive components | Takt misses, die damage | Stroke counts + cycle vs takt | Presses, weld cells, robots | Customer-auditable records |
| Cement / glass / aggregates | Rate below design, rare big stops | Throughput rate + drive currents | Kiln drives, mills, crushers, fans | Dust, heat, vibration sieges |
| Sugar / grain / feed mills | Campaign-season downtime | Vibration on mill train | Hammer mills, presses, elevators, conveyors | Dust (explosive), seasonal windows |
| Pharma / cleanroom | Excursions, serialisation drag | Environmental telemetry + audit trail | HVAC, compressors, purified-water | GMP validation of the monitoring itself |
| Chemicals / batch | Between-step waits, QC holds | Step start/stop timestamps | Agitators, pumps, utilities | Hazardous-area ratings |
| Textiles / CMT | Flow imbalance, upstream waits | Pieces/hour per line vs target | Compressor, boiler | Many small machines — count flow, not motors |
Three rules that survive every environment
- Instrument the constraint first. Every environment above has one asset or step that sets the plant's pace — the filler, the spindle bank, the kiln, the shared reactor. Points recovered there are the only points that reach the bank.
- Match the sensor to the loss, not to the catalogue. Count-based signals find discrete losses; current and vibration find rotating-asset decay; timestamps find batch waits. Buying vibration sensors for a changeover problem is the most common way to spend money and learn nothing.
- The old-machine excuse does not survive contact with a current clamp. Every environment on this page can be monitored without touching a PLC — counts, currents, temperatures and timestamps sit outside the control system, which is why machine age is not the obstacle it is assumed to be. That argument in full: OEE on an old line without a PLC.
Where to go deeper: OEE monitoring (the solution) · condition monitoring · what production monitoring costs · MES or just OEE? · TPM · the cost of unplanned downtime · bearing fault detection · shop-floor data collection.