ANALOX A50 User manual

A50 Carbon Dioxide Detector
User Manual
CAUTION:
PLEASE READ THE SAFETY INFORMATION ON PAGES 4 AND 22 BEFORE
INSTALLING THIS PRODUCT.

A50 Carbon Dioxide Detector
User Manual Int. Approved
Document ref: P0204-8000-03 July 2021 Page 3 of 27
Commercial in Confidence
List of Contents
1. Safety Notes....................................................................................................................4
2. Packaging Contents Check............................................................................................4
3. About the A50 ................................................................................................................5
4. A50 Accessories ..............................................................................................................6
5. Effects of carbon dioxide...............................................................................................7
6. Installation ......................................................................................................................8
6.1. How to fit an A50..................................................................................................................................................... 8
6.2. Remote Alarm Repeaters....................................................................................................................................12
6.2.1. To connect a “Hard Wired” Remote Alarm Repeater ...............................................................................................12
6.2.2. To connect a “Quick Connect” Remote Alarm Repeater.........................................................................................13
6.3. Cleaning.....................................................................................................................................................................13
7. Operation ......................................................................................................................14
7.1. Operation at Altitude ...........................................................................................................................................14
8. Alarm Indications .........................................................................................................15
8.1. Standard Unit ..........................................................................................................................................................15
8.2. TWA (Time Weighted Average) .......................................................................................................................15
8.3. Lamp and Alarm Test ...........................................................................................................................................15
8.3.1. Summary of Status Indicator Lamps................................................................................................................................16
9. Instrument Calibration & Test ....................................................................................17
9.1. Zero calibration adjustment..............................................................................................................................17
9.2. Alarm Test.................................................................................................................................................................19
9.3. Adjusting the Alarm Setpoints .........................................................................................................................20
9.3.1. Adjusting Alarm Setpoints...................................................................................................................................................20
10. Menu Navigation Flow Chart......................................................................................21
11. Technical Specifications...............................................................................................22
12. Disposal.........................................................................................................................23
13. Product variants ...........................................................................................................24
13.1. Part Number Matrix..............................................................................................................................................24
14. Warranty Information..................................................................................................25
15. Declaration of Conformity ..........................................................................................26
16. UK Declaration of Conformity ....................................................................................27

A50 Carbon Dioxide Detector
User Manual Int. Approved
Document ref: P0204-8000-03 July 2021 Page 4 of 27
Commercial in Confidence
1. Safety Notes
Every gas monitor installation should be risk assessed. The correct location of monitor(s) must
consider the potential sources of gas leaks and the location of expected human occupation in the
area. Where large areas must be monitored, it is often advised that no single monitor should cover a
volume in excess of 80m3. The installation of more monitors should be considered where an area is
complex in shape, filled with obstacles, has a lack ventilation or air circulation, or if there are dead
zones where gas can collect.
a) The A50 must be installed according to these instructions which should be read entirely
before commencing installation.
b) For your convenience the Remote Alarm Repeater cable is pre-wired to the A50 sensor unit.
c) The system MUST NOT be switched on until all connections have been correctly made.
d) We do not recommend you access the main unit. Potentially lethal voltages exist within the
A50. It should only be opened by a Qualified Technician and must be isolated from the
electrical supply before opening.
e) A proof test should be carried out at least 30 minutes after installation or relocation of the
unit, and then at least every 18 months.
2. Packaging Contents Check
The following items are enclosed:
a) A50 main unit with power lead and 8 metres of interconnecting cable for connection to the
Remote Alarm Repeater
b) A50 quick start guide or user manual
c) Test certificate
d) Wall plugs and screws for wall mounting
e) Remote Alarm Repeater
f) Warning label

A50 Carbon Dioxide Detector
User Manual Int. Approved
Document ref: P0204-8000-03 July 2021 Page 5 of 27
Commercial in Confidence
3. About the A50
The A50 is designed to detect the presence of carbon dioxide in ambient air for the protection of
people in confined spaces. The A50 provides audible and visual indication of potentially dangerous
levels of carbon dioxide in the air surrounding the instrument. The instrument uses an infrared
detector system, together with state of the art technology. It is housed in an IP65 splash proof
enclosure, and is designed to provide long, trouble free service, with minimum maintenance. The
Remote Alarm Repeater mimics the status indicators on the A50 unit. It also provides a push-button
which operates in the same manner as the Mode button on the A50.
If you have more than one entrance to your cellar or store room you may need more than one
Remote Alarm Repeater. Up to three repeaters can be daisy chained (one repeater linked to another)
covering up to three entrance doors.
Optional items fitted to, or supplied with the unit may include the following (as shown in the
photographs on Page 6):
a) Splash guard
b) Extra Remote Alarm Repeaters
c) Calibration gasses

A50 Carbon Dioxide Detector
User Manual Int. Approved
Document ref: P0204-8000-03 July 2021 Page 6 of 27
Commercial in Confidence
4. A50 Accessories
NOTE:
* -ITEMS A & B ARE CONSIDERED AS ACCESSORIES FOR SAFETY
OPERATION OF THE EQUIPMENT, ONLY ANALOX SUPPLIED
ACCESSORIES TO BE USED.
A*
B*
C

A50 Carbon Dioxide Detector
User Manual Int. Approved
Document ref: P0204-8000-03 July 2021 Page 7 of 27
Commercial in Confidence
5. Effects of carbon dioxide
1.000 ppm
(0,1%)
5.000 ppm
(0,5%)
10.000 ppm
(1%)
15.000 ppm
(1,5%)
20.000 ppm
(2%)
30.000 ppm
(3 %)
40.000-
50.000 ppm
(4-5%)
50.000-
100.000 ppm
(5-10%)
100.000-
1.000.000 ppm
(10-100 %)
For a more detailed outline of the dangers of CO2, please visit our website
www.analoxgroup.com

A50 Carbon Dioxide Detector
User Manual Int. Approved
Document ref: P0204-8000-03 July 2021 Page 8 of 27
Commercial in Confidence
6. Installation
6.1. How to fit an A50
CAUTION:
CARBON DIOXIDE GAS (CO2) IS HEAVIER THAN AIR AND
SHOULD BE MONITORED FROM A LOW HEIGHT. YOU
SHOULD THEREFORE INSTALL THE CO2SENSOR AT A
HEIGHT OF 12–18" (305–457MM) ABOVE THE FLOOR LEVEL.
NOTE:
FOR OPTIMAL PERFORMANCE, IF THERE IS A LARGE
VARIANCE BETWEEN WHERE UNITS ARE STORED AND
WHERE THEY ARE INSTALLED, IT IS RECOMMENDED THAT
UP TO 2 HOURS IS ALLOWED AFTER INSTALLATION BEFORE
APPLYING POWER. THIS IS TO ALLOW FOR TEMPERATURE
STABILIZATION IN THE UNIT WHICH IS IMPORTANT FOR
DEVICE ACCURACY.
1] The Remote Alarm Repeater should be located at eye level and attached to the outside
or immediately inside the access door. Remote

A50 Carbon Dioxide Detector
User Manual Int. Approved
Document ref: P0204-8000-03 July 2021 Page 9 of 27
Commercial in Confidence
2] Attach the main unit to the wall 305-457mm from the floor as close to the valves and
manifolds as possible.
3] A drilling template is included with this booklet.

A50 Carbon Dioxide Detector
User Manual Int. Approved
Document ref: P0204-8000-03 July 2021 Page 10 of 27
Commercial in Confidence
4] The A50 should be mounted onto a wall using the mounting lugs on the unit. Wall plugs
and screws are provided for this purpose. It is not necessary to dismantle the A50 main
unit in any way prior to installation.
5] An 8 metre 8 core cable is pre-wired to the A50. Run the Remote Alarm Repeater cable
to the outlet door, safely securing the cable with cable clips then wire up to the Alarm
Repeater.
Mains input
Repeater output