Most commercial buildings are still servicing equipment on a fixed calendar: change the HVAC filter on the first of the month, inspect the chiller every 90 days, lubricate the pump bearings every quarter. The problem is that calendar schedules have no relationship to actual equipment condition. A pump bearing that fails 3 weeks before its scheduled service date costs 4.8x more to repair as an emergency than as a planned intervention. A chiller inspected on schedule when nothing is wrong wastes technician time on equipment that did not need attention. Condition-based maintenance fixes both problems simultaneously. By monitoring real equipment parameters such as vibration, temperature, pressure, and current draw, CBM triggers maintenance only when sensor data confirms that intervention is actually needed. Companies adopting CBM have documented up to 30% reduction in maintenance costs and a 70% decrease in machine failures. Sign up free to deploy condition-based monitoring on your first building asset today, or book a demo to see how Oxmaint connects CBM sensor data to automated work orders across your full asset register.
Connect Sensor Data to Automatic Work Orders From Day One
Oxmaint integrates with your existing BAS and IoT sensors via BACnet/IP and OPC-UA, generating condition-triggered work orders automatically the moment a parameter breaches its threshold. No manual translation. No alerts lost in an inbox.
What Is Condition-Based Maintenance?
Condition-based maintenance (CBM) is a proactive maintenance strategy in which work is performed based on the actual measured condition of equipment, not on a fixed time interval. CBM uses sensors, monitoring devices, and data analytics to track real equipment health parameters continuously and trigger maintenance only when those parameters indicate developing failure or deterioration. CBM sits between time-based preventive maintenance and full predictive maintenance on the strategy spectrum. It answers the question "does this equipment need maintenance now?" using real data rather than a calendar date.
Maintain When Data Demands It
CBM monitors the current condition of equipment using diagnostics such as sensors, measurement devices, and data collectors. Maintenance is triggered only when indicators show signs of decreasing performance, developing wear, or approaching failure thresholds. No trigger means no work order.
The P-F Curve Position
On the P-F curve, CBM activates at the Point P where potential failure first becomes detectable through monitoring, well before functional failure at Point F. This window between P and F is the intervention opportunity CBM is designed to capture for every monitored asset class.
Four CBM Monitoring Techniques for Building Equipment
Each building equipment category has specific failure modes that require matching monitoring techniques. Effective CBM programmes in commercial facilities deploy a combination of these four methods, matched to each asset's most likely failure path and P-F interval.
Rotating Equipment Health
Measures vibration levels in motors, pumps, fans, and compressors to detect bearing wear, imbalance, misalignment, and mechanical loosening. Unusual vibration signatures indicate developing faults before any audible or thermal symptom appears. Most effective on HVAC fans, chiller compressors, cooling tower motors, and elevator drive systems.
Thermal Signature Monitoring
Uses temperature sensors and infrared monitoring to detect abnormal heat buildup in electrical panels, motor windings, switchgear, and cooling circuits. Elevated temperatures are a leading indicator of insulation degradation, connection failure, and component burnout. Critical for main distribution boards, UPS systems, and data centre cooling infrastructure.
Fluid System Integrity
Tracks pressure across HVAC water circuits, gas systems, compressed air networks, and hydraulic systems. Deviations from established pressure baselines indicate leaks, valve wear, filter blockage, or pump degradation before system failure occurs. Particularly valuable for building water supply, chilled water loops, and fire suppression systems.
Electrical Load Analysis
Monitors motor current draw, power factor, and energy consumption patterns continuously. A motor drawing more current than its established baseline is working harder than designed, indicating mechanical friction, bearing wear, or electrical degradation. Enables CBM on air handling units, pumps, lifts, and escalators without additional physical sensors.
Time-Based vs Condition-Based Maintenance: Full Comparison
The operational and financial difference between running fixed calendar schedules and deploying condition-based monitoring is measurable at every level of maintenance performance. This comparison shows what changes when FM teams move from TBM to CBM.
| Factor | Condition-Based Maintenance | Time-Based Maintenance |
|---|---|---|
| Maintenance Trigger | Real-time sensor data exceeds threshold. Work order created only when equipment condition confirms intervention is needed. No false positives from calendar drift. | Fixed calendar interval regardless of equipment condition. Healthy equipment serviced unnecessarily. Failing equipment may not be caught between schedule dates. |
| Unplanned Downtime | Failures detected at the P point on the P-F curve, 2 to 8 weeks before functional failure. Intervention scheduled before breakdown occurs. 35 to 50% downtime reduction documented. | Failures between schedule dates occur without warning. Emergency repair cost 4.8x the planned intervention rate. Downtime absorbs production hours and tenant disruption costs. |
| Maintenance Cost | Up to 30% total maintenance cost reduction. Labor and parts deployed only when asset condition confirms the need. No unnecessary component replacements on arbitrary calendar dates. | Over-maintenance on healthy assets wastes labor. Emergency repair premiums on failed assets inflate annual spend. Parts replaced before end of useful life adds avoidable cost. |
| Asset Lifespan | 20 to 40% increase in asset lifespan by catching and addressing developing failure modes before they cascade. Parts replaced at actual end of useful life, not arbitrary schedule intervals. | Assets either over-maintained with unnecessary work or under-maintained when developing failures fall between schedule dates. Premature replacement driven by undetected progressive degradation. |
| Technician Efficiency | Every work order justified by sensor data. Technicians arrive with full context, threshold breach details, and asset history. Time spent on genuine maintenance, not scheduled inspections of healthy equipment. | Technician time consumed by inspections that find nothing wrong. Skilled labor allocated to calendar-driven tasks rather than risk-weighted asset condition. Productivity below potential. |
| Compliance Evidence | Every CBM-triggered intervention documented with sensor reading, threshold breach timestamp, and work order record. Audit-ready evidence chain from condition detection to completed repair automatically generated. | Schedule compliance documented but condition at time of inspection not recorded. Cannot demonstrate that equipment was actually healthy between service dates. Regulatory gap in condition evidence. |
Building Equipment Priority Matrix: Where to Start CBM
Not every asset warrants condition monitoring. CBM delivers strongest ROI on equipment where failure is costly, detectable in advance, and likely to recur. In most commercial buildings, 15 to 20% of assets account for over 80% of unplanned downtime cost. These are your first deployment targets.
Chiller and HVAC Compressors
Vibration, temperature, and refrigerant pressure monitoring. Unplanned chiller failure in a commercial building carries $25,000 to $80,000 in emergency repair and tenant disruption costs. P-F interval of 3 to 6 weeks gives Oxmaint time to schedule planned replacement before failure.
Main Electrical Distribution
Thermal monitoring on switchgear, busbars, and main distribution boards. Electrical failures in commercial buildings carry fire risk and full-building shutdowns. Thermography detects connection degradation and load imbalances 4 to 6 weeks before fault progression to failure.
Boilers and Heat Exchangers
Pressure, temperature, and flue gas monitoring. Boiler failures in multi-tenancy buildings carry regulatory compliance consequences alongside repair costs. Combustion efficiency trending detects heat exchanger fouling and burner degradation before efficiency drops or safety limits are reached.
Cooling Towers and Pumps
Vibration and current monitoring on circulation pumps, fill degradation monitoring, and basin temperature tracking. Cooling tower pump failures in summer cause cascade HVAC failures affecting entire buildings. CBM window of 2 to 4 weeks enables planned part replacement at standard rates.
Elevators and Escalators
Motor current draw, door cycle counts, and brake performance monitoring. Lift failures in high-occupancy buildings generate significant tenant impact and regulatory inspection consequences. Current analysis detects drive motor degradation and brake wear before service disruption occurs.
Air Handling Units
Fan motor vibration, filter differential pressure, and coil fouling indicators. AHU failures affect indoor air quality, occupant comfort, and in regulated environments, GMP compliance. Filter blockage detection and motor wear monitoring prevent the cascade from reduced airflow to full system shutdown.
How Oxmaint Closes the CBM Execution Gap
The most common failure point in CBM programmes is not the monitoring technology. It is the gap between sensor alert and maintenance execution. An alert that goes to an email inbox or a BAS dashboard without triggering a structured work order delivers no operational value. Oxmaint closes that gap as a native platform capability. Sign up free to connect your first sensor stream to automatic work orders today.
Start CBM on Your First Asset Class This Week
Oxmaint connects to your existing BAS sensor infrastructure and begins generating condition-triggered work orders without hardware replacement or implementation consultants. First CBM alerts typically appear within days of connection. Book a demo to see the sensor-to-work-order flow for your building type and equipment profile.
CBM Results: What Oxmaint Users Document in Year One
CBM Regional Compliance and Standards Context
Condition-based maintenance is increasingly recognised in regional compliance frameworks as a more defensible maintenance approach than calendar-only scheduling, because CBM generates documented evidence of actual equipment condition at every intervention decision point.
| Region | Relevant Framework | CBM Documentation Advantage |
|---|---|---|
| USA | OSHA 29 CFR 1910 equipment maintenance records, ASHRAE 180 building maintenance standard, EPA energy efficiency documentation | Sensor-verified condition records, threshold breach timestamps, work order evidence chain from detection to repair closure |
| UK | PUWER 1998 equipment suitability evidence, Building Safety Act 2022 golden thread records, CIBSE TM65 energy monitoring | Continuous condition evidence demonstrating equipment suitability, golden thread asset health records, energy performance documentation |
| UAE | OSHAD-SF equipment monitoring requirements, Dubai Smart Building Standards, Vision 2030 IoT integration targets | IoT-verified condition monitoring records, smart building compliance documentation, sensor-to-work-order audit trail |
| Australia | WHS Act equipment maintenance obligations, NABERS energy performance monitoring, state-level building compliance requirements | Condition-verified maintenance evidence satisfies WHS duty of care obligations, energy monitoring feeds NABERS assessment |
| Germany | BetrSichV operational safety regulation, DIN EN 13306 maintenance terminology, VDMA predictive maintenance standards | Condition monitoring data satisfies BetrSichV evidence requirements, DIN-aligned maintenance records per asset class |
| Canada | CSA Z1000 maintenance management standard, Provincial OHS maintenance documentation, NRC building efficiency guidelines | CSA Z1000-aligned condition records, provincial OHS maintenance evidence from sensor data, efficiency documentation trail |
Frequently Asked Questions: Condition-Based Maintenance
QWhat is the difference between condition-based maintenance and predictive maintenance?
QWhich building equipment types benefit most from condition-based maintenance?
QDoes CBM require replacing our existing BAS sensors with new IoT hardware?
QHow long does it take to see ROI from a condition-based maintenance programme?
Stop Servicing Equipment on a Calendar. Start Servicing It on Condition.
Oxmaint connects to your existing building sensor infrastructure and converts every threshold breach into a structured, assigned work order automatically. No alerts lost in dashboards. No failures absorbed between schedule dates. No emergency repair premiums paid on failures that sensor data predicted weeks in advance. Book a 30-minute demo to see condition-based maintenance running on your building's actual asset register and equipment classes.
