ACG+
Service & Troubleshooting Manual
Int. Approved
Document ref: P0149-825-00
October 2022
Page 35 of 37
Copyright © 2022 Analox Ltd. All Rights Reserved.
Commercial in Confidence
5
FAQ’s (
most common solutions)
5.1
Recommended calibration gas concentrations
Sensor
Recommended low calibration
concentration
Recommended high calibration
concentration
O
2
0 to 10% O
2
20 to 25% O
2
CO
2
(0 to 1000ppm range)
0ppm CO
2
800 to 1000ppm CO
2
CO
2
(0 to 10000ppm range)
0ppm CO
2
8000 to 10000ppm CO
2
VOC
0ppm VOC
15 to 20ppm isobutylene (C
4
H
8
)
CO
0ppm CO*
15 to 20ppm CO*
H
2
O
Not for user calibration
Not for user calibration
*When performing a calibration of carbon monoxide (CO), due to the nature of the CO cell chemistry, a balance of air (20.9%
oxygen) should be present in the calibration gas mix in order to ensure maximum sensor accuracy.
5.2
Maintenance schedule of ACG+ components
System component
Maintenance required
Maintenance interval
Oxygen sensor
Replace electrochemical cell
Approx. 2 years or as required.
Carbon monoxide sensor
Replace electrochemical cell
Approx. 2 years or as required.
VOC sensor
Clean PID lamp and
electrode stack
As required, recommended every 3
months.
Replace PID lamp or whole
PID cell
Lamp - 5,000 hours (~6 months) Cell
–
5 years or as required.
Carbon dioxide sensor
Replace sensor
6 years
Water vapour sensor
Replace water vapour sensor 2 years
Activated charcoal filter
Replace filter
1 year
PID particulate filter
Replace filter
6 months or as required (Depending on
how dirty sample is)
Sensor flow adaptor orings
Replace oring
Check yearly and replace if required
5.3
CO
2
sensor range fault
For a CO
2
sensor to be out of range it could be down to three things.
•
Calibration- the sensor may need to complete a calibration. Refer to P0149-801 ACG+ User
Manual.
•
You may need to adjust the alarm set point. See section 5.11.2 of P0149-801 ACG+ User
Manual.
•
Warm up- the sensor may just be in a warm-up period after it has been turned on. This means
that the readings displayed are not valid. For this, wait for up to 60 seconds for it to level out.
