Vent 101 User manual

HAND-HELD RESPIRATORY
MECHANICS MONITOR
Service Manual
Model 101
April 17, 2000
Catalog No. 6800-90-01
Novametrix Medical Systems Inc.
PO Box 690
5 Technology Drive
Wallingford, Connecticut, U.S.A. 06492

Revision History
Rev. 01 Model 101 Service Manual
iii
Revision History
22-May-98 Release
17-Apr-00 Revision 01, R-N746

Revision History
iv
Model 101 Service Manual Rev. 01
[This page intentionally blank.]

Rev. 01 Model 101 Service Manual
v
Table of Contents
Safety ..................................................................................................... 1
Introduction ........................................................................................... 3
Ke
y
pad Controls and Indicators ........................................................................4
S
y
mbols .............................................................................................................4
Theory of Operation ............................................................................. 5
Main Board ........................................................................................................5
Power Supply ..............................................................................................................5
Reference Voltages .....................................................................................................5
Battery Charger ...........................................................................................................5
On/Off Control .............................................................................................................6
Digital Control and Microprocessor .............................................................................6
Serial Communication .................................................................................................7
Audio ...........................................................................................................................7
Interface ......................................................................................................................8
Analog Control Signals ................................................................................................8
Sensor Identification ....................................................................................................8
Flow Zeroing ...............................................................................................................8
Flow Circuitry ..............................................................................................................9
Barometric and Airway Pressure ...............................................................................10
Interface Board ................................................................................................11
Key panel Interface ...................................................................................................11
Display interface ........................................................................................................11
LED control ...............................................................................................................11
Power Supplies .........................................................................................................11
Functional Tests .................................................................................13
Equipment Required ........................................................................................13
Procedure ........................................................................................................13
Accuracy Tests ................................................................................... 15
Equipment Required ........................................................................................15
Procedure ........................................................................................................15
Electrical Tests ...................................................................................17
Equipment Required ........................................................................................17

Table of Contents
vi
Model 101 Service Manual Rev. 01
Procedure ........................................................................................................ 17
Power Supplies .........................................................................................................17
Airway Pressure Calibration ......................................................................................18
Differential Pressure Calibration ...............................................................................19
Barometric Pressure Calibration .....................................................................19
Maintenance ........................................................................................21
General ........................................................................................................... 21
Maintenance Schedules .................................................................................. 21
Cleanin
g
and Sterilization ................................................................................ 22
Batter
y
and AC Operation ............................................................................... 22
Battery Installation ....................................................................................................23
External Battery Charger ..........................................................................................23
Features Connector ..................................................................................................23
Assembl
y
Exchan
g
es ......................................................................................24
Disassembling the Monitor ........................................................................................24
Reassembling the monitor ........................................................................................26
Accessories .........................................................................................27
Parts Lists ............................................................................................29
6800-00 Final Assembly, Model 101 .........................................................................29
6800-01 Main Assembly, Model 101 .........................................................................29
2740-01 01 Main Board Assy, Model 101 .................................................................30
2740-17 01 Main Board Subassy, Model 101 ...........................................................30
2739-01 00 Battery & Comm Interface Board Assy ..................................................32
2741-01 00 Interface Board Assy, Model 101 ...........................................................32
6935-48 00 Test Fixture, Flow Leak Test .................................................................33
Drawings and Schematics .................................................................35

Rev. 01 Model 101 Service Manual
vii
Guarantee
Equipment manufactured or distributed by Novametrix Medical Systems Inc., is fully guaranteed,
covering materials and workmanship, for a period of one year from the date of shipment, except for
certain disposable products and products with stated guaranteesother than one year. Novametrix reserves
the right to perform guarantee service(s) at its factory, at an authorized repair station, or at the customer’s
installation.
Novametrix’ obligations under this guarantee are limited to repairs, or at Novametrix’ option,
replacement of any defective parts of our equipment, except fuses, batteries, and calibration gasses,
without charge, if said defects occur during normal service.
Claims for damages during shipment must be filed promptly with the transportation company. All
correspondence concerning the equipment must specify both the model name and number, and the serial
number as it appears on the equipment.
Improper use, mishandling, tampering with, or operation of the equipment without following specific
operating instructions will void this guarantee and release Novametrix from any further guarantee
obligations.
Caution: Federal (U.S.A.) law restricts this device to sale, distribution, or use by or on the order of a
licensed medical practitioner.
Copyright 1998, 2000 Novametrix Medical Systems Inc. This document contains information which
is proprietary and the property of Novametrix Medical Systems Inc., and may not be reproduced, stored
in a retrieval system, translated, transcribed, or transmitted, in any form, or by any means, without prior
explicit written permission from Novametrix Medical Systems Inc.
Declaration of Conformity with European Union Directive
The Authorized Representative for Novametrix equipment is:
D.R.M. Green
European Compliance Services Limited
Oakdene House
Oak Road
Watchfield
Swindon, Wilts SN6 8TD
Service Department
For factory repair service, call toll free
1-800-243-3444
In Connecticut, call Collect [phone]
FAX [phone]
http://www.novametrix.com
Email [e-mail]

Guarantee
viii
Model 101 Service Manual Rev. 01
Service Policy
Novametrix Medical Systems Inc. provides 24-hour a day access to technical support through its
Technical Support Department in Wallingford, Connecticut, and company Service Representatives
located throughoutthe United States. (Outside the U.S., primary technical support is handled through our
qualified international sales and service distributors.)
Novametrix will provide Warranty Service support within 48 hours of receiving a request for assistance.
Contact the Technical Support Department by telephone toll free at 800-243-3444, or 203-265-7701; by
facsimile at 203-284-0753; or, by e-mail at [e-mail]. After hours telephone support
requests (before 8:00 AM and after 5:00 PM Eastern Time) will be responded to promptly by the
Technical Support on-call staff. After hours facsimile and e-mail requests will be answered the next
business day. It is suggestedthat any person calling in for technical support have the equipment available
for product identification and preliminary troubleshooting.
Novametrix reserves the right to repair or replace any product found to be defective during the warranty
period. Repair may be provided in the form of replacement exchange parts or accessories, on-site
technical repair assistance or complete system exchanges. Repairs provided due to product abuse or
misuse will be considered “non-warranty”and invoiced at the prevailing service rate. Replaced or
exchanged materials are expected to be returned to Novametrix within 10 days in order to avoid
(additional) charges. Return materials should be cleaned as necessary and sent directly to Novametrix
using the return paperwork and shipping label(s) provided. (Transferring return materials to a local sales
or dealer representatives does not absolve you of your return responsibility.)
Novametrix manufactures equipment that is generally field serviceable. When repair parts are provided,
the recipient can call Technical Support for parts replacement assistance and repair assurance. In the
event a replacement part requires increased technical capability, Technical Support may request
Biomedical assistance, provide on-site technical support or complete replacement equipment. If the
customer requires the return of their original product, the exchange material will be considered “loaner
material”and exchanged again after the customer equipment is repaired.
Novametrix promotes customer participation in warranty repairs, should they become necessary. A
longer useful product life, and quicker, more cost-effective maintenance and repair cycles—both during
and after the warranty period, are benefits of a smooth transition into self-maintenance. The Technical
Support Department can provide technical product support at a level appropriate to your protocol and
budget requirements.
Please contact Technical Support for information on these additional programs and services:
•Focus Series Technical Training Seminars
•Test Equipment and Test Kits
•Service Contract / Parts Insurance Plans
•On-Site Technical Support
•“Demand Services”including
Flat rate parts-exchange
Flat rate return for repair
Time and Material
•Full warranty, discounted replacement sensors

Rev. 01 Model 101 Service Manual
1
Section 1
Safety
The VENT✔Handneld Respiratory Mechanics Monitor, Model 101, is electrically isolated. Patient
leakage current flowing from the instrument to ground is limited to less than 10 uA.
•Keep the VENT✔and its accessories clean. Do not operate the VENT✔when it is wet due to spills
or condensation.
•Connect only Novametrix Series 3 Flow Sensors to the VENT✔. For maximum performance; keep
the pressure sensor ports oriented upward, and keep the sensor clear of moisture and secretions by
proper breathing circuit maintenance.
•Connect the sensor first to the VENT✔and then to the patient breathing circuit in order to limit
circuit volume loss and to avoid excessive moisture build-up in the flow sensor tubing.
•VENT✔has electrically isolated inputs. Patient leakage current flowing from the instrument to
ground is limited to less than 10 µA at 120 V, 60 Hz. Patientisolation is greater than 10 MΩ, 2500V
rms at 60 Hz.
•Where electromagnetic devices (i.e., electrocautery) are used, patient monitoring may be interrupted
due to electromagnetic interference. Electromagnetic fields up to 3 V/m will not adversely affect
system performance.
•VENT✔contains no user serviceable parts. Refer servicing to qualified service personnel.
•This product and its accessories which have patient contact are latex free.
For maximum patient and operator safety, observe the following warnings and cautions.
•Explosion Hazard: Do NOT use the VENT✔in the presence of flammable anesthetics. Use of this
instrument in such an environment may present an explosion hazard.
•Electrical Shock Hazard: Always turn the monitor off before cleaning it. Do NOT use a damaged
monitor or sensor. Refer servicing to qualified service personnel.
•Fire Hazard: The VENT✔should not be exposed to elevated oxygen levels at elevated pressures.
Use in such an environment may present a fire hazard.
•Failure of Operation: If the monitor fails to respond as described, do not use it until the situation
has been corrected by qualified personnel.
•Do not apply tension to thesensor tubing while connected to a patient breathing circuit, as accidental
extubation may result.
•Do not position the flow sensor’s tubing in any manner that may cause entanglement or
strangulation.
•Use the optional external battery charger in non-patient areas only.
WARNINGS
Indicates a potentially harmful condition that can lead to personal injury.
!

Section 1
2
Model 101 Service Manual Rev. 01
•Federal (U.S.A.) law restricts this device to sale, distribution, or use by or on the order of a licensed
medical practitioner.
•Electrical Shock Hazard: Always turn the monitor off before cleaning. Do NOT use a damaged
monitor.
•Do NOT use a damaged flow sensor.
•Do NOT immerse the monitor or sensors in liquids.
•Do NOT sterilize the monitor or the sensors.
•No user serviceable parts inside. Refer servicing to qualified service personnel.
•Operate at temperatures between +10°C to +40°C (50-104°F), < 90% relative humidity (non-
condensing).
•Avoid storing the monitor at temperatures less than -20°C or greater than +55°C (<-4°F or >131°
F).
•The VENT✔operates with Novametrix Series 3 Flow Sensors only.
•The VENT✔performs an automatic zero (self calibration) periodically and as needed. During this
time, monitoring is interrupted for less than three seconds.
•The automatic zero can be manually initiated by simultaneously pressing the DATA and GRAPH
keys. After changing the sensor from Adult to Neonatal (while the VENT✔is operational), wait 30
seconds then perform an automatic zero.
•This product and its accessories which have patient contact are free of latex.
•The C20/C Compliance Ratio (neonatal) parameter is not supported.
•To determine the VENT✔software version, turn the monitor on. During the self test performed at
power up, the software level is shown on the third line as “main-101-xx”, where “xx”is the software
version.
•Some VENT✔monitors were produced with the statement “Use only Novametrix approved devices,
13 VDC, 1A”located on the label at the Flow Sensor Input Connector. This erroneous statement
does NOT apply to the VENT✔monitor and should be ignored.
CAUTIONS
Indicates a condition that may lead to equipment damage or malfunction.
NOTES
Indicates points of particular interest or emphasis for more efficient or convenient operation.