Service Interval Units
This page explains Service Interval Units — the measurement basis for service schedules — and describes the difference between time-based and consumption-based units.
What Are Service Interval Units?
Every Service Plan specifies a frequency using a Service Interval Unit. The unit determines whether the service schedule is based on calendar time or on actual asset usage.
Unit Types
Time-Based Units
Time-based units schedule services after a fixed amount of calendar time has elapsed. No usage tracking is required — the system calculates due dates based on the start date and interval.
| Unit | Example Schedule |
|---|---|
| Hours | Service air conditioning every 2,000 hours of operation |
| Days | Inspect emergency lighting every 30 days |
| Weeks | Check fire alarm panels every 4 weeks |
| Months | PAT test portable appliances every 12 months |
| Years | Full building inspection every 5 years |
Consumption-Based Units
Consumption-based units schedule services after the asset's usage (tracked by a "clock") reaches a threshold. These depend on actual or estimated usage recorded against the asset — see Asset Clock Readings.
| Unit | Example Schedule |
|---|---|
| Miles | Vehicle minor service every 10,000 miles |
| Kilometres | Vehicle service every 15,000 km |
| Running Hours | Generator service every 500 running hours |
Tip: You can combine both types on a single Service Plan by setting a primary interval and an alternative. For example, "every 10,000 miles or every 12 months, whichever comes first". See Creating a Service Plan for details.
Managing Service Interval Units
You can add, rename, or configure units to match your organisation's needs. The default set covers common scenarios, but you may need to add custom units for specialist equipment.
TODO Screenshot:
ClickMenu "Maintenance Setup" | PrintScreen "pm-service-interval-units"
Warning: Renaming or deleting a unit that is in use by existing Service Plans may cause those plans to behave unexpectedly. Check for dependent plans before making changes.
Related Articles
- Planned Maintenance Introduction — Introduction to the planned maintenance module
- Maintenance Setup — Configuring maintenance plans and intervals
- Creating a Service Plan — How to create a service plan
- Asset Clock Readings — Managing clock-based readings for assets