ANALOX EII CO User manual

EII CO
Technical User Manual
Analox Ltd
15 Ellerbeck Court, Stokesley Business Park
North Yorkshire, TS9 5PT, UK
T: [phone] F: [phone]
W: www.analox.net E: [e-mail]

EII CO Technical User Manual
Document Ref: P0107-801-00 - February 2011
Page 4
List of Contents
1 Introduction ........................................................................................................................6
1.1 Scope of this Manual.....................................................................................................6
1.2 About the EII CO............................................................................................................6
2 Calibration..........................................................................................................................7
2.1 Items required................................................................................................................7
2.2 Calibration procedure ....................................................................................................7
3 Safety Information............................................................................................................12
4 Spares..............................................................................................................................13
5 Disposal ...........................................................................................................................14

EII CO Technical User Manual
Document Ref: P0107-801-00 - February 2011
Page 5

EII CO Technical User Manual
Document Ref: P0107-801-00 - February 2011
Page 6
1 Introduction
1.1 Scope of this Manual
This Technical manual is supplementary to the EII CO User Manual (P107-800). This manual
details the procedure for performing a zero and span calibration of the EII CO. For general
details of using and maintaining the EII CO please refer to the EII CO user manual
1.2 About the EII CO
The EII CO carbon monoxide analyser is designed to measure CO levels in the range 0 to
50ppm for tank CO level checking.
The EII CO is ergonomically designed, and equipped with several features to ensure ease of
use and reliability. The instrument has been designed to be held in the left hand to facilitate
checking your tank. It is fitted with a large digital display and incorporates an internal
electrochemical carbon monoxide sensor. Power is provided by a 9V battery which will last
for approximately 1 year before replacement is necessary. The EII CO will automatically
switch off after 10 minutes to ensure battery life is not compromised if the instrument is
accidentally turned on.
The EII CO is water and drop resistant. Designed specifically for the diving industry – whether
you may be a Sport, Commercial or Military diver - where hostile environmental conditions are
the norm not the exception.

EII CO Technical User Manual
Document Ref: P0107-801-00 - February 2011
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2 Calibration
2.1 Items required
To calibrate the EII CO the following items are required:
1. Calibration tool kit (Part number: SA7EIICOTOOLKIT)
2. Zero calibration gas kit (Part number: SA7EIICOZCALKIT)
3. Span calibration gas kit (Part number: SA7EIICOCALKIT)
2.2 Calibration procedure
1. Using a flat blade screwdriver loosen the 4 M2.5 slotted screws located on the front
cover (these are captive screws so can not be fully removed from the cover). The
gasket seal is designed to prevent water leaking into the EII CO so the seal may be
tight. Loosen the seal by moving the lid from side to side, and then and carefully lift
the cover.
2. Using the T10 torx driver from the Calibration Tool Kit remove the two silver
M3x14mm T10 Torx Plastite screws through the front of the middle section
Remove screws
3. Temporarily refit the front cover and secure in place.

EII CO Technical User Manual
Document Ref: P0107-801-00 - February 2011
Page 8
4. Using the T10 torx driver remove the two black M3x16mm T10 Torx Plastite screws
and black fibre washers. Remove the rear cover.
5. Screw the flow indicator on to the zero calibration cylinder (synthetic air) and fit the
flow adaptor to the tubing.
Flow indicator fitted
Flow adaptor fitted
6. Remove the sample dome and attach the flow adaptor to the sensor port. Press the
ON button to switch the EII CO on.
Flow adaptor fitted

EII CO Technical User Manual
Document Ref: P0107-801-00 - February 2011
Page 9
7. Open the control valve of the flow indicator to set the flow indication ball between the
two markers. Allow the gas to flow for 2 minutes and ensure the display reading is
settled.
Flow indicator set
8. Using the external Zero calibration knob, adjust the display to read’000’.
Display set to ‘000’
9. Close the control valve of the flow indicator. Remove the control valve from the zero
calibration cylinder and fit it to the span calibration cylinder (10ppm carbon monoxide
in balance air).
10. Open the control valve of the flow indicator to set the flow indication ball between the
two markers. Allow the gas to flow for 2 minutes and ensure the display reading is
settled.
11. Using the trimming tool from the calibration tool kit, adjust the internal trimmer until
the display reads '010' (± 1).
Trimmer
Flow
markers

EII CO Technical User Manual
Document Ref: P0107-801-00 - February 2011
Page 10
Display set to ‘010’
12. Close the control valve of the flow indicator and remove the flow adaptor from the
sensor port. Refit the sample dome in to the sensor port.
13. Place the lanyard loop over the dowel pin then fit the back cover in place, making
sure the CO sensor lead runs down the rear of the battery compartment as shown.
Affix the cover using the two M3x16mm screws and fibre washers.
Replace back cover and refit screws
14. Remove the front cover then fit the two silver M3x14mm T10 Torx Plastite screws
through the front of the middle section; these will secure the rear section in place.
Refit screws

EII CO Technical User Manual
Document Ref: P0107-801-00 - February 2011
Page 11
15. Feed the CO sensor cable so that it curls around the inside of the middle section, fit
the red front section. Secure in place with the four M2.5 slotted screws, taking care
not to trap or damage the CO sensor wiring.
Reassembled EII CO
End of procedure