Blease Datum L Series User manual

User Manual
Datum 'L' Vaporizer
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Blease
User Manual
Blease
Anaesthesia Vaporizer
R
L Series

Datum 'L' Vaporizer
User Manual
2

User Manual
Datum 'L' Vaporizer
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Datum 'L'
Vaporizer
User Manual
'L' Series Datum are smaller and lighter than other Datums. The serial
number, found on the back of the vaporizer, ends with the letter 'L'
Part Number: 130UM000
Issue 2/December 1999
0120
MODIFICATIONS LABEL
ECN 1
3573
ECN 2
3707
ECN 3
4445
ECN 4 ECN 5
ECN 6 ECN 7ECN 8ECN 9ECN 10
V2.11/10/04

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Read this Manual before operating the
ventilator.

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Table of Contents
Responsibilities of the Manufacturer......................................................7
Datum Service Policy ............................................................................7
Responsibilities of the User ...................................................................7
Foreword...............................................................................................9
Warnings and Cautions.........................................................................10
Importance of Patient Monitoring...........................................................12
Symbols and Abbreviations...................................................................13
1. Introduction .................................................................................... 15
2. Description ..................................................................................... 16
2.1 Principles...................................................................................18
2.2 Concentration Control................................................................20
2.3 Switching the Vaporizer ON.......................................................20
3. Specifications................................................................................. 21
3.1 Physical.....................................................................................21
3.2 Concentration Control................................................................21
4. Filling and Draining ........................................................................ 22
4.1 Standard Screw Cap Filler.........................................................23
4.1.1 Filling...............................................................................23
4.1.2 Draining...........................................................................23
4.2 Keyed Filler ...............................................................................24
4.2.1 Filling...............................................................................24
4.2.2 Draining...........................................................................25
4.3 Quik-fil Filler...............................................................................26
4.3.1 Filling...............................................................................26
4.3.2 Draining...........................................................................27
5. Installation ...................................................................................... 28
5.1 Cagemount Model .....................................................................28
5.2 Selectatec Compatible Interlock Model.......................................29
5.3 Dragerwerk AG-Compatible Model.............................................30
6. Routine Maintenance...................................................................... 30
6.1 Cleaning....................................................................................31
6.2 Draining Halothane....................................................................31
6.3 Checking output Concentration..................................................32
6.4 Training.....................................................................................33
6.5 Pre Use Check ..........................................................................34
7. Performance ................................................................................... 36
7.1 Halothane Model........................................................................36
Contents

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Contents
7.2 Enflurane Model.........................................................................38
7.3 Isoflurane Model ........................................................................40
7.4 Sevoflurane Model.....................................................................42
7.5 Temperature Compensation.......................................................44
7.6 Barometric Pressure ..................................................................44
7.7 Composition of the Gas..............................................................46
7.8 Summary...................................................................................46
7.8.1 Accuracy of Output...........................................................46
7.8.2 Gas Flow Resistance........................................................46
7.9 Effects of Back-Pressure on Output............................................47
7.9.1 Steady Back-Pressure......................................................47
7.9.2 Effect of IPPV on Output...................................................48
7.10 Gas Composition ......................................................................48
7.10.1 Air...................................................................................48
7.10.2 Nitrous Oxide ..................................................................48
7.10.3 Carbon Dioxide................................................................48
7.10.4 Helium.............................................................................48
8. References ...................................................................................... 49
8.1 General......................................................................................49
8.2 Keyed Filler Interlock System.....................................................49
8.3 Trademarks and Acknowledgements..........................................49
9. Order Information ...........................................................................50
Index.....................................................................................................51

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1. Introduction
Responsibilities of the Manufacturer
The manufacturer accepts responsibility for the effects on safety,
reliability and performance of the equipment only if assembly
operations, extensions, adjustments, modifications and repairs are
carried out by persons with written authorisation from the
manufacturer.
Datum® Service Policy
The Blease Datum® must only be serviced by qualified service
personnel. The contents of this manual are not binding. If any
significant difference is found between the product and this manual
please contact Blease for further information.
The Blease Datum® is designed to function reliably without the
inconvenience of an expensive regular maintenance schedule.
In communication with Blease, quote the model and serial number
of the equipment, with the approximate date of purchase. If the unit
is being returned for repair, indicate the nature of the fault or the
work you require to be carried out. Contact the Company to obtain
a Goods Return Number (GRN) prior to returning the product. This
is to ensure traceability and to speed the return following repair.
Isoflurane, Enflurane and Sevoflurane vaporizers require a full
service after 10 years. Halothane vaporizers require a full service
after 5 years.
Responsibilities of the User
The Blease Datum®vaporizer conforms with the specifications and
operating procedures described in this manual and on any
accompanying notices and labels only if it has been installed, used
and maintained in accordance with the instructions. The safe
function of the vaporizer can only be guaranteed if it is regularly
checked and serviced at or in excess of the standards specified in
this manual.
If the vaporizer is suspected of being worn, defective or otherwise
unfit for use, it should under no circumstances be used.

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Broken, worn, missing or contaminated components must be
replaced immediately; contact the Blease distributor from whom the
vaporizer was obtained for further service advice.
Contact:
Blease
Beech House
Chiltern Court
Asheridge Road
Chesham
Buckinghamshire HP5 2PY
England
Tel: [phone]
Fax: [phone]
Copyright © 1993, 1994, 1995, 1996, 1999, 2001 Blease Medical
Equipment Ltd. All rights reserved. The information contained in
this publication may not be used for any other purpose than that for
which it was originally supplied. This publication may not be
reproduced in part or in whole without the written consent of
Blease Medical Equipment Limited.

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Foreword
This manual contains all appropriate information concerning the
use, function, performance and maintenance of the Blease Datum®
vaporizer.
Blease Medical has a policy of continued product improvement and
therefore reserves the right to make changes which may affect the
information contained in the manual without giving prior notice.
Read this manual before operating the vaporizer.
The user must be familiar with the machine and its various
functions before using it on a patient.
The terminology in this manual complies with ISO4135,
Anaesthetic Apparatus Terminology.
The following symbols are used in this manual in addition to those
specified above:
%Vol —volumetric percentage. A method of expressing the
concentration of a vapour in order to compare it with the
concentration of a true gas. 100%Vol is equivalent to 100% partial
pressure in a mixture.
WARNING: There is danger of personal injury to the user or
the patient.
Caution: There is danger of damage to the vaporizer or other
equipment.
Note: Further relevant or helpful information.

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Warnings and Cautions
The following statements are made to comply with the
requirements of IEC 60601-1.
1. This device may be sold to, and used on the order of, a
medically qualified practitioner only.
2. This vaporizer is designed for use with one anaesthetic
agent only, which is that named on the filler.
Incorrect dosage may result if the wrong drug is used in
this vaporizer.
National and international standards are provided for by
the keyed filler version of this vaporizer.
3. The anaesthetic agent is named on the filler according
to BP, USP or Ph EUR. It is the user's responsibility to
ensure that the trade name of a drug is equivalent to that
used in the appropriate pharmacopoeia.
4. The vaporizer must be secured in the upright position
before it is connected to a patient and a leak test
performed.
Excess dosage may be delivered if the vaporizer is
moved suddenly during use.
5. In the interests of health and safety it is recommended
that the vaporizer be drained prior to transportation.
The concentration control must be set to zero if the
vaporizer is transported when filled. The vaporizer must
be secured in the upright position for at least one hour
before it is connected to a breathing system. It should
then be flushed at 4 l/min for two minutes before being
connected to a patient.
Excess dosage may be delivered if adequate time is not
allowed for the liquid to return to its normal level.
If the vaporizer has been transported with the
concentration control at any position other than zero
contact the Blease Service Department or an authorized
engineer for advice.

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6. Anaesthetic agents are poisonous; great care must be
taken to avoid the spilling of an agent during filling or
drainage to prevent the hazard of prolonged inhalation
of trace concentrations from the atmosphere.
Expired anaesthetic gases should be extracted from the
operating theatre by an approved anaesthetic gas
scavenging system.
7. The concentration control must be set to zero during the
draining or filling process.
The delivered concentration will be incorrect when the
filler port is open.
The vaporizer must be secured in the upright position
during filling in order to prevent overfilling.
8. Do not overfill the vaporizer. If it is overfilled, it must be
withdrawn from use and the Blease Service Department
or an authorized engineer contacted for advice.
9. While in use, check frequently that the liquid level is
between the minimum and maximum marks on the level
indicator.
10. The vaporizer may cease to function correctly if it is
exposed to excessive temperatures as the temperature
compensation device may be damaged. The vaporizer
should be stored between -20oC and 50oC (-5oF and
122oF).
11. The output of the vaporizer is affected by barometric
pressure, and it may be necessary to use a correction
factor when analysing the output, especially at high
altitudes >1500 metres (See 7.6)
The barometric pressure is not normally of clinical
significance. All Blease vaporizers are calibrated at sea
level.
12. Anaesthetic agents must be treated as pharmaceutical
products; liquid must never be drained into an open
container and reused in case of contamination. The
liquid must always be disposed of as a hazardous
chemical.

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13. The vaporizer must never be modified or dismantled by
any unauthorised person, but should be serviced at the
prescribed intervals by a Blease Service engineer or
Agent, or a trained technician, and no-one else.
14. The vaporizer must be connected so that the flow of gas
to the patient is as indicated by the arrows on the
device.
The delivered concentration will be incorrect if the flow
is reversed.
15. The Blease Datum® ®vaporizer has a relatively high flow
resistance and must not be incorporated in a breathing
system downstream of the common gas outlet.
16. Before use, all joints must be checked for leaks and the
backbar function tests must be performed as described
in the anaesthetic machine User Manual.
17. If the vaporizer is fitted with a Selectatec ® or
interlocking Cage-mount manifold, the interlock
function is void if used with a non-interlock device.
Importance of Patient Monitoring
Anaesthesia systems have the capability to deliver mixtures of
gases and vapours to the patient which could cause injury or death
unless controlled by a qualified anaesthetist.
There can be considerable variation in the effect of anaesthetic
drugs on individual patients so that the setting and observation of
control levels on the anaesthesia system does not in itself ensure
total patient safety.
Anaesthesia system monitors and patient monitors are very
desirable aids for the anaesthetist but are not true clinical monitors
as the condition of the patient is also dependant on his respiration
and the functioning of his cardiovascular system.
WARNING: It is essential that these elements are monitored
frequently and regularly and that any observations are given
precedence over machine control parameters in judging the
state of a clinical procedure.

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Symbols and abbreviations used on Blease Equipment

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Notes

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1Introduction
The Blease Datum® Vaporizer is intended for use in the fresh gas
supply of a continuous flow anaesthetic machine. It should be
connected between the flowmeters and the common gas outlet.
Because of the high internal resistance, the vaporizer is unsuitable
for use in a breathing system.
The Blease Datum® Vaporizer provides accurate concentrations of
anaesthetic gases in the fresh gas supply; the concentration is
specified using a dial on the front of the vaporizer. The fresh gas
supply should be between 0.5 and 15 l/m.

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2Description
Cagemount Model Key Filler Version
Key
AInlet connector
BOutlet connector
CConcentration control
DFiller port clamp
EFiller valve control knob
FLevel indicator
LFiller port
The sight glass markings at Fon this diagram are shown as a filled
triangle for the Maximum Liquid Level and an empty triangle for the
Minimum Liquid Level.

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Selectatec® compatible Interlock Model Standard Version
Key
CConcentration control
FLevel indicator
GInterlock pins (Selectatec® only)
HLocking knob
KDrain plug
VFiller cap
WDrain screw
The sight glass markings at Fon this diagram are shown as a filled
triangle for the Maximum Liquid Level and an empty triangle for the
Minimum Liquid Level.

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2.1 Principles
Key
AInlet connector
BOutlet connector
CConcentration control
KAnaesthetic drug in liquid form
LVapour chamber
MWick (IPPV coil)

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WARNING: The Blease Datum® Vaporizer is designed and
tested for use only with the drug specified on the front panel.
The chamber contains the anaesthetic drug in liquid form K, and
the wick M and N ensures that the upper part of the chamber
remains filled with a saturated vapour of the drug.
As the vapour is many times more concentrated than required for
clinical use, a concentration control C regulates the gas flow
through the vapour control valve P, the bypass valve R and vapour
chamber to produce the required concentration.
When the control is set to zero the bypass remains open; however,
the vapour chamber is completely isolated from the patient gas
flow. When the control is set to the desired concentration, valve S
opens allowing flow into the vapour chamber.
The temperature-compensating device T varies the dilution ratio
provided by the concentration control and bypass passage Rso
that the output concentration remains substantially constant
irrespective of temperature.
The vaporizer may be fitted with a screw-cap filler, a Quik-Fil®filler,
or a keyed filler.

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2.2 Concentration Control
The concentration control Cregulates the concentration of
delivered vapour.
The dial automatically locks at the zero position when turned to off,
and must be pushed inwards and rotated counterclockwise to set a
concentration according to the graduations on the dial.
2.3 Switching the Vaporizer On
WARNING: Never attempt to switch on the vaporizer without
checking that it is fully locked on to the manifold.
1. Push in the dial and rotate it counterclockwise to the desired
concentration, as indicated by the markings on the control
knob.
2. When the vaporizer is not in use, the control should be
turned to the zero position to prevent any delivery of vapour.