Perform precision check (pre-check) prior to
commencing any service tasks or making any changes
to the system as found in its current state. This task is
necessary to validate any previously captured data.
Check particulate filter, replace if full/dirty
Check sample inlet system for moisture or foreign
materials. Clean if necessary
Check fan filter and clean if necessary
Check date and time is correct
Check instrument status light
External vacuum pump check (vacuum source)
Cell Pressure of 50 to 200 torr is a good vacuum
Perform NO
X
span calibration
Perform precision check (post-check) once all service
tasks have been completed. This task is necessary to
establish a valid start point to begin capturing new
data.
Single point NO
2
converter efficiency check
Single point NH
3
converter efficiency check
Replace the PMT Desiccant Packs
Perform multipoint precision check
Calibrate analog outputs (only if used)
Replace sintered filter and orifice (only if necessary)
Multipoint NO
2
to NO converter efficiency adjust
Multipoint NH
3
converter efficiency adjust
* Suggested intervals for maintenance procedure are a guide only and may vary with sampling intensity and/or
environmental conditions. Please refer to your local regulatory standard for your personalised maintenance
schedule.