Instructions for Use
12 Pages
Preview
Page 1
Demand Valve Test Instrument Instructions for Use
702-0106.3 October 2013
Contents Page 1.
Symbols ... 2
2.
Warnings and Cautions ... 2
3.
2.1.
Warnings! ... 2
2.2.
Cautions! ... 2
2.3.
Notes ... 3
Functional Description ... 3 3.1.
Intended Use ... 3
3.2.
Technical Description ... 3
4.
Device Specification ... 3
5.
Operating Instructions ... 4 5.1.
Connecting Air Supply ... 4
5.2.
Check Calibration ... 5
5.3.
Flow Test - Ultraflow™ Demand Valve ... 5
5.4.
Internal Leak Test - Ultraflow™ Demand Valve ... 6
5.5.
External Leak test - Ultraflow™ Demand Valve ... 6
5.6.
Comparative Inhalatory Resistance Tests ... 6
6.
Cleaning ... 7
7.
Maintenance... 7
8.
Troubleshooting... 7
9.
Parts and Spares List ... 8
10. Test Recording ... 8
1
1.
Symbols Warning!
Indicates a potentially hazardous situation which, if not avoided, could result in personal injury to the user or others
Caution!
Indicates a potentially hazardous situation which, if not avoided, could result in damage to the equipment or property
Note
Highlights points that might allow more convenient or efficient operation of the equipment.
Attention, consult accompanying documents
Use no oil
Service due date
2.
Warnings and Cautions
2.1.
Warnings! Read through this entire instruction manual before using or showing others how to use this Demand Valve Test Instrument. Attempting use without a thorough understanding of its operation may result in user injury.
Only connect Demand valves that have been decontaminated to this test instrument. Testing of a potentially contaminated Demand Valves may lead to cross-contamination of other Demand Valves.
This Demand Valve Test Instrument is only suitable for use with medical air. Check the cylinder or supply is medical air before use.
Gas specific connectors are fitted to the Demand Valve Test Instrument. Do not attempt to modify the fittings to suit other gases or fitting systems.
Do not use oil or grease on the Demand Valve Test Instrument. Arrange the gas hose carefully to avoid damage to the hose and the potential for causing a trip hazard. Never pull or apply excessive force to a gas hose. A leaking Demand Valve hose may result in high local oxygen and nitrous oxide concentrations and an increased risk of fire.
2.2.
Cautions! The performance of the Demand Valve Test Instrument may be affected if it is stored or transported in temperature outside of the range -20°C to +60°C (-4°F to +140°F).
Never permit compressed medical gases to enter a pressure regulator suddenly. Always open the cylinder valve slowly.
2
2.3.
Notes Ensure that the medical air supply is sufficient for the proposed testing and is supplied within the pressure range given in the device specification. If the supply is a gas cylinder, check the cylinder contents gauge regularly.
If using a cylinder and regulator, ensure that the device is connected to the regulator and the cylinder valve is properly open.
3.
Functional Description
3.1.
Intended Use The Demand Valve Test Instrument is intended to verify satisfactory performance of an Ultraflow™ Demand Valve following a service or repair. See 702-0053 Service Manual: Analgesic and Oxygen Demand Valve for the service and repair process. The Ultraflow™ Demand Valve is designed to meet or exceed the requirements of BS 42722:1996 - Anaesthetic and analgesic machines. Specification for intermittent (demand) flow analgesic machines for use with 50/50 % (V/V) nitrous oxide and oxygen. The Demand Valve Test Instrument may also be used to confirm the relative performance of other demand valves.
3.2.
Technical Description The Demand Valve Test Instrument is used to verify the performance of a demand valve by measuring the inhalatory effort (resistance to inhalatory flow) required to deliver air at flow rates of 50 and 150 litres per minute. The resistance to inhalatory flow is measured using a pressure gauge, which measures the pressure inside the handset relative to local atmospheric pressure during gas delivery The flow rate is measured and indicated by a flow gauge. Additional steps are outlined to measure internal leakage using an included cap.
4.
Device Specification
Specification
Minimum
Maximum
Gas Supply Pressure to Test Instrument
250 kPa (36 psi)
1000 kPa (145 psi)
Gas Supply Flow Capacity to Test Instrument
40 sl/min
-
Gas Supply Pressure to Handset
350 kPa (51 psi)
600 kPa (87 psi)
Gas Supply Flow Capacity to Handset
160 sl/min
-
Temperature for Storage and Transport
-20 °C (-4 °F)
+60 °C (140 °F)
+/- 10% of full scale
-
(1)
(1)
(2)
Accuracy of measured pressure
at flow rate indicated
(1)
4 bar medical air supply recommended, with local market connection.
(2)
Equivalent to resistance to inhalatory flow.
3
5.
Operating Instructions
5.1.
Connecting Air Supply
5.1.1.
Close Flow Control Knob Ensure the grey control knob is turned anti-clockwise, approximately 12 turns (from being fully engaged), to ensure that there will be no gas flowing through the system when the air supply is connected. If turned further, the flow control knob thread may disengage. If disengaged, reengage thread by two turns.
Flow Gauge Pressure Gauge
Flow Control Knob
5.1.2.
Connect Air Supply to Test Instrument Connect a medical air supply to the pneumatic connector on the rear panel of the test instrument using the hose supplied. The supply source must be capable of maintaining a pressure of between 250 kPa and 1000 kPa at up to 40 sl/min. Pressure Regulator REF 819-0083, supplied by BPR Medical Ltd, may be used for this purpose.
5.1.3.
Connect Air Supply to Demand Valve Connect the demand valve to a medical air supply, the supply pressure should be between 350 and 600 kPa and be capable of delivering a minimum flow rate of 160 sl/min. Pressure Regulator 4
REF 819-0083, supplied by BPR Medical Ltd, may be used for this purpose. To prove connection, gas should flow freely through the demand valve when the test button on the handset is pressed and should stop when the test button is released.
5.2.
Check Calibration
5.2.1.
Zero Gauges Zero both gauges by turning the adjustment screw at the bottom of the glass cover on the gauges with a small flat blade screwdriver.
5.2.2.
Fit Flow Tube Fit the gas-flow tube onto the aluminium fitting on the right hand side of the case.
5.2.3.
Fit Calibration Cap Fit the calibration check cap (CC Cap) onto the end of the gas-flow tube and turn the grey control knob until the flow reaches 80 sl/min.
5.2.4.
Check Calibration Reduce the flow to ‘A’; the pressure gauge should now read 32 ±3 mmH2O. If the pressure, which is equivalent to resistance to inhalatory flow, reads outside this range contact your supplier for advice on re-calibration.
5.2.5.
Remove Calibration Cap Reduce the flow and pressure back to zero, and remove the calibration cap.
5.3.
Flow Test - Ultraflow™ Demand Valve
5.3.1.
Fit Demand Valve Fit the demand valve (without an exhalation valve fitted) onto the end of the gas-flow tube (see 5.1.3 for connecting device to gas supply). Ensure the handset cover (blue as shown, or grey) is fitted correctly.
5.3.2.
High Flow test Turn the grey control knob clockwise until the flow rate is at ‘C’ on the left hand side flow rate gauge. Slowly reduce the flow rate to ‘B’ and read the pressure on the right hand side gauge and record it; it should be less than 50 mmH2O.
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Note: Reducing the flow rate to below ‘B’; then back up will result in a false reading due to a hysteresis effect. If this happens repeat this step. 5.3.3.
Low Flow Test Slowly reduce the flow rate to ‘A’. Record the pressure indicated on the right hand gauge.
5.3.4.
Remove Demand Valve Reduce the flow rate and pressure back to zero and remove the Demand Valve. This should result in a pressure, which is equivalent to the resistance to inhalatory flow, of not more than 40 mmH2O. If the reading was greater than 40 mmH2O contact your supplier for advice.
5.4.
Internal Leak Test - Ultraflow™ Demand Valve
5.4.1.
Fit Leak Test Adaptor Fit the leak test adapter into the demand valve, where the exhalation valve would normally be fitted and connect the demand valve to a 400 kPa medical air supply.
5.4.2.
Connect Flowmeter Connect the output from the leak test adapter to a calibrated flowmeter.
5.4.3.
Measure leak Measure the leak through the device and record the result. If the leak is more than 5 ml/min contact your supplier for advice.
5.5.
External Leak test - Ultraflow™ Demand Valve Remove the demand valve cover to expose the hose connection. Spray the joint at the interface of the demand valve with the hose with 1% Teepol HB7 leak detection solution and check for leaks indicated by continuous formation of bubbles. If a significant leak is found contact your supplier for advice. Once completed, wash off leak detection fluid with clean water and dry device.
5.6.
Comparative Inhalatory Resistance Tests For any other manufacturers demand valve (with 22M Outlet), or an Ultraflow™ Demand Valve with Exhalation Valve attached, tests can be conducted as described below. The demand valve should always be used with a patient filter. For this reason, comparative tests of the performance of demand valves should be conducted with a patient filter fitted, so as to be representative of a patient’s inhalatory effort in normal use. For a BPR Medical Demand Valve this test is conducted with an exhalation valve fitted. Fit the adaptor (supplied) to the end of the gas flow tube to accept the 22M fitting on the exhalation valve. Other demand valve models should be fitted with the patient filter type specified by the manufacturer and should also have a 22M connection. Note: The primary function of the Demand Valve Test Instrument is to verify satisfactory performance of Ultraflow™ Demand Valves following a service or repair. For this purpose the test is conducted without a patient filter fitted. Due to the additional resistance to flow introduced by the exhalation valve or patient filter, a flow of 150 sl/min may not be achievable within the full scale range of the right hand gauge on the Demand Valve Test Instrument. It is recommended to compare the performance of demand valves by determining the maximum flow attainable at the highest resistance to inhalatory flow i.e. 50 mmH2O.
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6.
Cleaning
To clean the Demand Valve Test Instrument, wipe down with a mild detergent solution.
7.
Maintenance
The Demand Valve Test Instrument; • does not require routine maintenance, but can be repaired; • requires a service and re-calibration every 4 years. Service due date is shown on the device rating label; • medical gas hoses should be replaced 4 years after the date of manufacture given on the hose label; • should be returned to BPR Medical for service or repair. Contact details can be found at the back of this Instruction for Use or by visiting www.bprmedical.com.
8.
Troubleshooting
Fault
No gas flow
Possible Cause
Solution
Demand valve handset is not connected properly
Check gas supply. Check that the gas specific probe is correctly connected.
Gas cylinder empty
Replace gas cylinder
Seek advice from someone authorised Medical gas terminal unit on a pipeline to operate the medical gas pipeline system is isolated system isolation valves. Demand valve probe blocked
Repair or service required
Hole in demand valve diaphragm. In this instance, the demand valve will work with the Test Button but not Repair or service required when used conventionally by inhaling through the mouthpiece or face mask. Valve or diaphragm has become dislodged
Remove the exhalation valve and check that the diaphragm is lying flat and that it moves forwards and backwards when the Test Button is pressed.
Tilt valve worn, bent or broken
Repair or service required
Medical gas hose damaged
Remove from service and replace
Tilt valve damaged or blocked
Repair or service required
Tilt valve damaged
Repair or service required
Diaphragm perforated
Repair or service required
Supply pressure too low and/or gas cylinder nearly empty
Check gas supply and/or replace gas cylinder
Audible gas leak
Constant gas flow
Insufficient gas flow
Pressure gauge reading zero when Pressure gauge tubing damaged or there is gas flow and demand valve broken or test cap fitted
Repair or service required
When test cap applied wrong results are given
Service or repair required
Tubing inside the case damaged or broken
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9.
Parts and Spares List
The table below lists parts numbers for the Demand Valve Test Instrument and its spare parts.
REF
Description
Connection
828-0053
Demand Valve Test Instrument
Universal
605-0059
Demand Valve Test Instrument Gasflow Tube Assembly
Universal
602-0362
Demand Valve Test Instrument Calibration Check Cap
Universal
602-0364
Demand Valve Test Instrument 22M Filter Adaptor
Universal
602-0321
Demand Valve Test Instrument Leak Test Coupling
Universal
605-0060
Demand Valve Test Instrument Supply Hose - MA4 CPC
BS 5682
605-0067
Demand Valve Test Instrument Adaptor Hose - MA4 N2O/O2
BS 5682
605-0072
Demand Valve Test Instrument Adaptor Hose - MA4 O2
BS 5682
819-0083
Pressure Regulator (High Flow)- MA4-PI - BS 5682
BS 5682
10.
Test Recording
A suggested template for recording test data is presented below. Serial Number
123E12345
Next Service Due
Mar-12
Pressure at Flow Pressure at Flow Internal of 50 sl/min of 150 sl/min Leakage (mmH2O)
(mmH2O)
(mL/min)
38
45
0
8
External Leakage
Pass
BPR Medical Limited
T: +44 (0)1623 628 281
22 Hamilton Way, Mansfield
F: +44 (0)1623 628 289
Nottinghamshire
NG18 5BU, United Kingdom
www.bprmedical.com