QA-PT
User and Service Manual
QA-PT Parameter Tester
P/N 14625
V.1.29
Copyright © 2001 by METRON. All rights reserved.
METRON:
USA_
1345 Monroe NW, Suite 255A
Grand Rapids, MI 49505
Phone:
(+1) 888 863-8766
Fax:
(+1) 616 454-3350
E-mail: support.us@metron-biomed.com
FRANCE
________________
30, rue Paul Claudel
91000 Evry, France
Phone: (+33) 1 6078 8899
Fax:
(+33) 1 6078 6839
E-mail: info@metron.fr
NORWAY________________
Travbaneveien 1
N-7044 Trondheim, Norway
Phone:
(+47) 7382 8500
Fax:
(+47) 7391 7009
E-mail: support@metron.no
Disclaimer
METRON provides this publication as is without warranty of any kind, either express or implied, including but not limited to the implied warranties of merchantability or fitness for any particular purpose.
Further, METRON reserves the right to revise this publication and to make changes from time to time to
the content hereof, without obligation to METRON or its local representatives to notify any person of such
revision or changes. Some jurisdictions do not allow disclaimers of expressed or implied warranties in
certain transactions; therefore, this statement may not apply to you.
Limited Warranty
METRON warrants that the QA-PT Parameter Tester will substantially conform to published specifications and to the documentation, provided that it is used for the purpose for which it was designed. METRON will, for a period of twelve (12) months from date of purchase, replace or repair any defective tester, if
the fault is due to a manufacturing defect. In no event will METRON or its local representatives be liable
for direct, indirect, special, incidental, or consequential damages arising out of the use of or inability to
use the QA-PT Parameter Tester, even if advised of the possibility of such damages. METRON or its
local representatives are not responsible for any costs, loss of profits, loss of data, or claims by third parties due to use of, or inability to use the QA-PT Parameter Tester. Neither METRON nor its local representatives will accept, nor be bound by any other form of guarantee concerning the QA-PT Parameter
Tester other than this guarantee. Some jurisdictions do not allow disclaimers of expressed or implied warranties in certain transactions; therefore, this statement may not apply to you.
Trademarks
Duracell is a registered trademark of Duracell, Inc.
ii
Table of Contents
1.
INTRODUCTION............................................................................................................1-1
1.1
Features .......................................................................................................................................1-1
1.2
Specifications ...............................................................................................................................1-1
1.3
General Information......................................................................................................................1-2
2.
INSTALLATION.............................................................................................................2-1
2.1
Receipt, Inspection and Return ..................................................................................................2-1
3.
OPERATING QA-PT......................................................................................................3-1
3.1
Controls and Terminals ................................................................................................................3-1
3.2
Power ...........................................................................................................................................3-1
3.3
Operating QA-PT..........................................................................................................................3-2
3.4
Cleaning the QA-PT .....................................................................................................................3-2
4.
RUNNING TESTS..........................................................................................................4-1
4.1
Pressure / Temperature................................................................................................................4-1
4.2
Gas Flow / Temperature (Models 2G and 2H Only) ....................................................................4-2
4.3
Barometric Pressure and Relative Humidity
(Models 2G and 2H Only)........................................................................................................................4-3
5.
SERVICING QA-PT .......................................................................................................5-1
5.1
Troubleshooting Procedures .......................................................................................................5-1
5.2
Firmware upload...........................................................................................................................5-1
6.
CALIBRATING QA-PT ..................................................................................................6-1
6.1
General.........................................................................................................................................6-1
6.2
Procedures ...................................................................................................................................6-1
7.
COMPONENT FUNCTIONS AND PARTS....................................................................7-1
iii
7.1
System Overview..........................................................................................................................7-1
7.2
QA-PT Hardware ..........................................................................................................................7-1
APPENDIX A - SCHEMATIC DIAGRAMS............................................................................. A-1
APPENDIX B – ERROR REPORT FORM ............................................................................. B-1
APPENDIX C - IMPROVEMENT SUGGESTION FORM ....................................................... C-1
iv
Manual Revision Record
This record page is for recording revisions to your QA-PT User and Service Manual that have been
published by METRON AS or its authorized representatives. We recommend that only the management or facility representative authorized to process changes and revisions to publications:
•
make the pen changes or insert the revised pages;
•
ensure that obsolete pages are withdrawn and either disposed of immediately, or marked as
superseded and placed in a superseded document file, and;
•
enter the information below reflecting that the revisions have been entered.
Rev No
Date Entered
Reason
0
2000-02-20
Initial Release
1.29-1
2001-01-24
Signature of Person Entering Change
METRON
General Update
v
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vi
1. Introduction
This chapter describes the METRON QA-PT Parameter Tester’s features and specifications.
1.1
Features
QA-PT is a compact, lightweight high performance parameter tester
designed to be used by trained service technicians for calibration or
test of medical and industrial devices.
It is a versatile test instrument, able to measure multiple parameters. Basic parameters cover pressure, vacuum and temperature measurements (Models 1H and 1G).
Gas flow, barometric pressure and humidity measurements are
included in the enhanced QA-PT (Models 2H and 2G). QA-PT
is menu driven, and simple to operate. All functions are set
from a 128 x 32 pixel graphical display.
1.2
Specifications
Pressure Measurement
QA-PT Model 1H or 2H:
Operating range:
-350 to +350 mmHg
Accuracy:
0.1% of range
Resolution:
0.1 mmHg
Units of measure:
mmHg, mBar, cmH2O, PSI,
InHg, InH2O, kgcm2 and kPa
QA-PT Model 1G or 2G:
Operating range:
Accuracy:
Resolution:
Units of measure:
-700 to +5000 mmHg
0.05% of range
1 mmHg
mmHg, mBar, cmH2O, PSI,
InHg, InH2O, kgcm2 and kPa
Temperature Measurement
Operating range:
-200 to +750 °C
Accuracy:
1% of reading
Resolution:
0.1 °C and °F
Units of measure:
°C and °F
Use standard external temperature probe type PT-100 or PT-1000
(DIN/IEC 751 Class A) for temperature measurements in °C or °F.
Temperature Probe Specification:
PT-100:
Operating range:
-200 to +750 °C
Accuracy:
100 °C
0.13 °C @
0.1 °C @ 0 °C
0.2 °C @ 100 °C
PT-1000:
Operating range:
-200 to +750 °C
Accuracy:
0.3 °C
Barometric pressure
QA-PT Model 2G or 2H:
It is possible to compensate for the sea level and calibrate for offsets.
Operating range:
Accuracy:
Resolution:
Units of measure:
380 to 900 mmHg
2 % of reading
1 mmHg
mmHg, mBar, inHg and hPa
Temperature Simulation (Optional)
High precision tester module for temperature calibration/verification is
optional.
Operating range:
Accuracy:
Standard:
25, 37, 38, 40 and 44°C
0.025% of reading
YSI 400
Gas Flow
QA-PT Model 2G or 2H:
Measures with an embedded sensor with 11 calibration points to compensate nonlinearity.
Calibration constants stored in firmware.
Operating range:
Accuracy:
Resolution:
Compatibility:
Units of measure:
-750 to +750 ml/min
1% of range or
5% of reading
0.1 ml/min
Gas: Air, N2, O2, CO2, H2 and He
ml/min (or SCCM - Standard Cubic Centimeters per Minute)
Relative Humidity
QA-PT Model 2G or 2H:
An integrated sensor in the instrument determines relative humidity
measurements.
1.3
1-2
Operating range:
Accuracy:
Resolution:
Gas compatibility:
Units of measure:
0 to 100% RH
2% @ 25 °C
1% RH
Air
% RH
Temperature
Requirements:
+15°C to +35°C when operating
0°C to +50°C in storage
Display/Control:
LCD graphic display, 128 x 32 pixel
Data Input/Outputs (1):
Bi-directional RS-232C for Computer control
Power:
9 Volt Alkaline Battery RG9 or Battery eliminator
Case:
ABS plastic case
Weight:
0.4 kg / 0.9 lbs. with battery
General Information
Dimensions:
D x W x H:
34mm x 94mm x 156mm
1.3 in x 3.7 in x 6.1 in
Part No:
QA-PT Parameter Tester
Standard Accessories:
Optional Accessories:
14600:
14601:
14602:
14603:
QA-PT
QA-PT
QA-PT
QA-PT
14625:
14620:
14621:
17021:
User-/Service Manual QA-PT
High-Impact Plastic Carrying Case
Tubing Kit
230 VAC to 9 VDC Battery Eliminator
-or115 VAC to 9 VDC Battery Eliminator
Option - Temperature Simulation
PT-100 Temperature Probe
PT-1000 Temperature Probe
Expansion Chamber
Inflation Bulb
17027:
14605:
14611:
14612:
14610:
14622:
Model 1H
Model 1G
Model 2H
Model 2G
1-3
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1-4
2. Installation
This chapter explains unpacking, receipt inspection and claims, and
the general procedures for QA-PT setup.
2.1
Receipt, Inspection
and Return
1.
Inspect the outer box for damage.
2.
Carefully unpack all items from the box and check to see that you
have the following items:
3.
4.
•
QA-PT Parameter Tester (P.N. dependent on model)
•
QA-PT User-/Service Manual (P.N. 14625)
•
Tubing Kit (P.N. 14621)
If you note physical damage, or if the unit fails to function according to specification, inform the supplier immediately. When METRON or the company’s Sales Agent, is informed, measures will be
taken to either repair the unit or dispatch a replacement. The customer will not have to wait for a claim to be investigated by the
Sales Agent. The customer should place a new purchase order to
ensure delivery.
When returning an instrument to METRON, or the Sales Agent, fill
out the address label, describe what is wrong with the instrument,
and provide the model and serial numbers. If possible, use the
original packaging material for return shipping. Otherwise, repack
the unit using:
•
a reinforced cardboard box, strong enough to carry the
weight of the unit.
•
at least 5 cm of shock-absorbing material around the unit.
•
nonabrasive dust-free material for the other parts.
Repack the unit in a manner to ensure that it cannot shift in the
box during shipment.
METRON’s product warranty is on page ii of this manual. The warranty
does not cover freight charges. C.O.D. will not be accepted without
authorization from METRON or its Sales Agent.
2-1
3. Operating QA-PT
This chapter describes the controls and terminals of the QA-PT Parameter Tester. It also provides basic operating instructions.
3.1
Controls and Terminals
QA-PT Front Panel
1. LCD Display
1.8 cm x 5.8 cm (.7 in. x 2.3 in.) 128 x 32 pixel window displaying messages, test results and function
menus.
2. Function Keys
Used to select various preset test parameter options,
and run the tests.
3. Menu Scroll Keys
Used to navigate between and confirm the various
preset test parameter options.
4. Test Keys
Pressing these opens the relevant test screen:
press / temp
Pressure / Temperature Test.
With QA-PT Models 2G and 2H the following
additional tests can be performed:
flow / temp
Gas Flow / Temperature Test.
environment
Barometric Pressure / Relative Humidity Test.
5. On / Off
Turns the unit on and off.
QA-PT Bottom Panel
6. Battery Compartment
Compartment for holding a 9 V alkaline battery.
QA-PT Left Side Panel
7. Temp.
8-pin mini-DIN plug connector for the temperature
cable. Use standard external temperature probe type
PT-100 or PT-1000 (DIN/IEC 751 Class A) for temperature measurements in °C or °F.
8. RS-232
8-pin mini-DIN plug for connecting an RS-232. This is
used for uploading new firmware, transfer of measuring results, and calibration. You need a customized
cable to do this interface.
2.1 mm micro jack for connecting either a 9 VDC or
9VAC plug-in power supply transformer for use in
operating the unit from any standard electrical outlet.
The jack polarity is center negative. We recommend
you use one of METRON’s Battery Eliminators (P.N.
17021 or P.N. 17027), available separately from your
METRON Sales Agent.
9. Battery Elim.
QA-PT Top Panel
10. Pressure
3.2
Pressure port connector.
Power
1. The parameter tester uses 9 V alkaline batteries. It is designed to
use as much of the battery as possible. When it detects less than
about 6.8 V, it , sounds a continuous tone alarm. When it detects
less than 6.0 V, it goes into a shutdown mode
3-1
NOTE
Remove the batteries and
disconnect the Battery Eliminator if you do not intend to use
the QA-PT for an extended
period of time.
3.3
The battery is situated in the base of the instrument. Use 9-volt
alkaline batteries (Duracell® MN1604 or equivalent). Do not use
mercury, air or carbon-zinc batteries.
2.
As an alternative to batteries you can power the tester with a 2.1
mm size plug adapter (for example, METRON’s 9 VAC Adapter /
Battery Eliminator, P.N. 17021, or 9 VDC Adapter / Battery Eliminator, P.N. 17027). The adapter voltage must not exceed 14.5
volts.
Operating QA-PT
Operating QA-PT is simple. Make whatever required connections that
are needed for the desired test. By using the tester’s keypad you control the tests.
1.
Press the tester ON. The LCD window displays the QA-PT model,
installed firmware version and the unit’s serial number for about
two seconds.
The window then displays the pressure / temperature display.
This is the default test.
NOTE
When there is a temperature
sensor attached to the unit this
will be indicated in the display,
If not, “NA” will be displayed.
3.4
2.
Select the F1-F4 function keys to set the test parameter presets.
Use the right menu scroll key to navigate between the various
options. Press the F1-F4 function key under the desired test
preset. Press the left menu scroll key to confirm to desired preset.
3.
For QA-PT Models 2G and 2H, press a test key to go to a test
screen other than the default pressure / temperature test. After
reaching the desired test, select the F1-F4 function keys to set
the test parameter presets. Use the right menu scroll key to
navigate between the various options. Press the F1-F4 function
key under the desired test preset. Press the left menu scroll key
to confirm to desired preset.
Cleaning the QA-PT
The outside of the instrument may be cleaned using a damp cloth
with mild detergent. Please note that some solvents like Methanol may damage the overlay and cabinet.
3-2
4. Running Tests
This chapter describes QA-PT test procedures by function. If you are
unfamiliar with the testers’ basic operation, refer to paragraph 3.3,
Operating OA-PT.
4.1
Pressure / Temperature
0.0 mmHg
. Peak
Leak
F1
xx °C
Zero
Unit
F3
F2
F4
0.0 mmHg
<<
mmHg
F1
0.0 mmHg
F2
0.0 mmHg
F1
F2
>>
mBar
mHo
F3
F2
45s
60s
F3
F4
xx °C
<< Peaktest
Reset
F3
1.
xx °C
xx °C
<< Leaktest
15s
30s
F1
inHo
Peak (F1) Peak test will be displayed as long as the measurement
is performed. QA-PT will display the highest value of the
measurement. The measurement can be reset with the
F4 key.
Leak (F2) By selecting F1 ->F4 you can set the time for the leak
measurement. This interval can be set to 15,30.45 and
60 seconds, and the difference between the start/stop
pressure is displayed.
Unit (F3) QA-PT can display the result in the following units:
mmHg, inHO, mBar, cmHo, kPa, inHg, PSI, Kgcm and
C/F. You can convert between them using the menu
scroll function.
Zero(F4) Resets the pressure measurement. This function should
only be used to set zero and not for relative measurements in proportion to a given pressure.
F4
2.
3.
Press the right menu scroll key ► to
view the available units of measurement.
Select the desired unit by pressing the
appropriate F1-F4 key.
Press the left menu scroll key ◄ to
confirm the selection.
4.
5.
To start the test, pressurize the circuit.
6.
Press the left menu scroll key ◄ to return to th
preceding screen.
7.
Press the left menu scroll key ◄ to return to
the preceding screen.
8.
Reset = Resets the measurement in progress to zero.
Formatted: Bullets and Numbering
Select the desired time for the measurement by
pressing the appropriate F1-F4 key. The result
then appears after this time expires.
F4
4-1
Formatted: Bullets and Numbering
4.2
Gas Flow / Temperature
(Models 2G and 2H Only)
If you select the flow/temp option, the QA-PT will switch on the power
supply for the gas flow sensor(battery save function will not turn the
power on for this circuit before it's in use) The sensor will need approx.
1 minute to warm up before the measuring result is accurate.
Gas (F1)
xxx sccm
Gas
F1
Unit
F2
xxx °C
Peak
Zero
F3
F4
Sets the type of gas you are using for the measurement. Note: This parameter must be set right in order to make correct measurements.
Unit (F2) Sets SCCM, ml/min for gas flow and °C/F for the temperature.
Peak (F3) Peak test is displayed as long as the measurement is
performed. QA-PT displays the measurement’s highest
value. Reset the measurement with the F4 key.
Zero (F4) Resets the pressure measurement. This function
should only be used to set zero, and not for relative
measurements in proportion to a given pressure.
xxx sccm
<<
xxx °C
Peaktest
Reset
F1
xxx sccm
F3
F2
>>
ml/Min
F1
F2
C/F
F3
F4
<<
>>
Air
N2
O2
CO
F1
F2
F3
F4
4-2
Reset = Resets the measurement in pro
gress to zero.
Select the unit of gas flow with the F1 or F2
keys, and the unit of temperature with the F4
key..
8.
Press the left menu scroll key ◄ to confirm
the selection(s).
Note: An optional PT100 or PT 1000 temperature
probe is necessary for the temperature
6.
xxx °C
2.
7.
5.
xxx sccm
Press the left menu scroll key ◄ to return to the preceding screen.
F4
xxx °C
<<
sccm
1.
7.
Press the menu scroll keys◄ ► to view the
available types of gas.
Select the desired type of gas by pressing the
appropriate F1-F4 key.
Press the left menu scroll key ◄ to validate
the selection
Formatted: Bullets and Numbering
4.3
Barometric Pressure and
Relative Humidity
(Models 2G and 2H Only)
When environment is selected the power supply for the barometric
pressure sensor will be switched ON. The sensor will need about ten
seconds to warm up before the measuring results are reliable.
xxx hPa
xxx %RH
HPa
mmHg
mBar
F1
F2
F3
inHg
1.
Use the F1 to F4 keys to select the barometric
pressure measuring unit. The barometric pressure
and the relative humidity are then measured.
2.
Return by pressing a test key.
F4
4-3
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4-4
5. Servicing QA-PT
This chapter covers QA-PT maintenance and troubleshooting procedures.
5.1
Troubleshooting
Procedures
1.
Missing Firmware
If the firmware is missing from the flash memory the QA-PT will
not respond to the ON/OFF button. The unit can be turned on, but
the display will be blank.
2.
3.
Voltage Levels
Signal
Min[V]
Nominal[V]
Max[V]
VCC
4.80
5.00
5.20
V5P
4.90
5.00
5.10
V8P
8.20
8.30
8.40
Current consumption
Current consumption depends on which QA-PT mode you are
running. The power supply for each section is switched on/off according to the selected function. All the values in the following table is calculated from a 9V power supply.
5.2
Function
Min[mA]
Nominal[mA]
Pressure
8
10
Max[mA]
12
Flow
20
22
24
Environment
13
15
17
Firmware upload
The first time you upload firmware to the QA-PT you will need to
mount a strap on S2. The unit is then turned on, and reset is selected. The firmware upload program is operated from DOS, and
will work only on a PC-compatible computer with Windows95/98
(not compatible with Windows NT).
Power up the while pressing the F1 button. This will erase the new
firmware. Connect an RS-232 cable between the QA-PT and the
computer’s COM1 port, and run the d.bat file. The computer will
then display instructions on the screen during the upload process.
5-1
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5-2
6. Calibrating QA-PT
6.1
General
The first time that you boot the QA-PT there are no default values for
the different sensors (apart from the relative humidity and barometric
pressure). This means that none of them will give any measuring results. If the specific sensor is not mounted, the QA-PT displays “NA”.
To change the calibration constants you need to access the hidden
calibration menu. This is done by selecting press/temp, select unit
and then press the right menu scroll key twice. Then, select F4.
6.2
Procedures
1. Pressure
Important! A stable temperature is required to do pressure
measurements.
Pressure is calibrated on five different values so as to compensate for any linearity problem in the pressure sensor. The offset
for temperature is calibrated on two values. These values should
be approximately 5°C and 20°C (room temperature and refrigerator temperature). All measurements should be performed without
disassembling the unit.
2. Linearity calibration
Turn the unit on and wait for 15 minutes so as to stabilize the
temperature.
Select unit in the press/temp menu and press right menu scroll
key twice. Then, press F4 to access the hidden calibration menu.
Select F1 for pressure calibration. There are two different calibrations, depending upon the pressure sensor.
3.
ƒ
For the measuring range – 350mmHg -> 350mmHg METRON calibrates on the following values: -300, -100, 0, 100
and 300mmHg.
ƒ
For the measuring range –750mmHg -> 5000mmHg we have
the following calibration values: -500, -100, 0, 500 and
3000mmHg.
Offset Temperature Calibration
Immediately after calibrating the linearity you must calibrate the
offset temperature. This is done by pressing the right menu
scroll key while you’re in the pressure calibration menu. Select
HiT (High Temperature, F2). Then, press F4 to calibrate room
temperature. LowT (Low Temperature, F1) is calibrated by placing the unit inside of a refrigerator. When the unit has reached a
stable temperature, press F4 to calibrate.
6-1
The pressure is now calibrated. Make sure that the unit displays 0
mmHg with different temperatures.
4.
Temperature
QA-PT is calibrated on 0°C and 100°C for both the PT-100 and
the PT-1000 sensors.
Access the calibration menu and select F2 for temperature calibration. Connect the calibration resistors and calibrate on 0°C and
100°C. Calibration resistor specifications are listed in the following
table.
Sensor
0°C
100°C
PT-100
100 Ohm
138.5 Ohm
PT-1000
1000 Ohm
1385 Ohm
These values are used on both sensors, with the alpha value being 0.00385. If another sensor is used, this resistor values would
change.
5.
Relative Humidity
Offset calibration is done by selecting the right menu scroll key
and pressing F1 (Humi) in the calibration menu, and adjusting the
displayed value in accordance with the relative humidity. F3 will
set the step size for F1 and F2. When the right value is set, select
F4 to calibrate.
If the RH% is not calibrated you should use the standard values.
6.
Barometric pressure
Offset calibration is done by selecting the right menu scroll key
and F3 (Baro) in the calibration menu, and adjusting the displayed value in accordance with the barometric pressure. F3 will
set the step size for F1 and F2. When the right value is set, select
F4 to calibrate.
If the Barometric pressure is not calibrated you should use the
standard values.
NOTE
All flow values must be calibrated because QA-PT will
calculate a curve from these
results. Verify some of the
values in between the calibration values to ensure that
values are correct.
6-2
7.
Gas Flow
Gas flow is calibrated on eleven different flow values ( -1000, 500, -250, -100, -50, 0, 50, 100, 250, 500, and 1000). To calibrate, access the calibration menu and select F4 (flow). Select
the flow value with F1, F2 and calibrate with F4.
7. Component Functions and Parts
This chapter provides a description of the functions of the main components of the QA-PT, as well as a parts list for cross-reference.
7.1
System Overview
The QA-PT consists of four main modules: a central processing unit, a
communications module, a power supply and an analog module. It has
functions for temperature correction of measuring values, linearity correction, leakage test, peak detection, high-pressure alarm, battery
watchdog and user-defined measuring units. There are two different
versions of the QA-PT, depending upon which Motorola MPX-series
pressure transducer, or sensor is mounted in the unit.
QA-PT has a 32 x 132-pixel display, and is operated by the soft keys
in the top panel. Measured values are shown in the display, as well as
sent to an RS232C serial connector. This serial connector allows the
QA-PT to interface with a computer, and be operated remotely.
Since the QA-PT’s firmware is stored in its flash memory, it can be
upgraded from a computer. The latest firmware version can be
downloaded from the Metron’s Website. Calibration adjustments are
done through software and the calibration constants are saved in an
EPROM.
7.2
QA-PT Hardware
Refer to Appendix A, which contains nine schematic diagrams. Seven
of these diagrams refer to the QA-PT itself, while the remaining two
describe the RS-232 cable and PT-100/PT-1000 temperature cable
pin outs, and temperature calibration pin outs.
1.
Central Processing Unit. (Refer to Specification Drawing QA-PT
CPU, page A-3). The QA-PT is built around a Motorola HC11F1
CPU, with a clock frequency of 2 MHz. The addressing range is
divided into two, 32-kilobyte blocks. One is used for program, or
“flash” memory, and the other is dedicated to SRAM and I/O. QAPT is always started in a special bootstrap mode, with RXD and
TXD short-circuited. This short-circuit starts the EEPROM program (bootload). The program will detect if the F1 key is pressed.
If F1 is not active, the short circuit switch will be opened, and the
startup sequence is finished. If F1 is active, the firmware upload is
triggered.
2.
Display. QA-PT has a 122 x 32 pixel graphical display. It is connected to both the address and data bus, J5. The refresh clock is
actuated through a 555 timer, U23. The negative supply voltage
for the contrast is obtained from the RS-232 transceiver, U19.
3.
Analog Module. (Refer to Specification Drawings QA-PT Analog,
page A-5; QA-PT Temperature and Flow, page A-6, and; QA-PT
Pressure and Barometer, page A-7). QA-PT is designed with a
reference voltage that is used to supply the Motorola MPX-series
pressure transducer. This is to prevent any deviation in the trans-
7-1
ducer that could affect the measurements. The analog part is
based on a Burr-Brown 24-bit differential A/D converter with an
SPI interface to the CPU, ADS1213U, and U13. The A/D converter has a built in 4:1 analog multiplexer. The attached sensor
will measure in cycles, dependent upon the measuring mode. The
A/D converter is also used for relative humidity, internal temperature and battery voltage.
The 2.5 V reference voltage is generated in the differential instrumentation amplifier, INA125, U12. The reference voltage supplies a Motorola MPX-series pressure sensor (U8) that is connected to U12. For QA-PT Models 1H and 2H the Motorola pressure sensor is the MPX7050 GP, while for Models 1G and 2G the
sensor is the MPX2700 GP. Different pressure sensors can be
used for the different measuring ranges.
An absolute pressure sensor (Motorola MPX2200A, U6) is used
to measure the barometric pressure. The supply voltage for this
device is only connected when this is required. The signal amplifier is an Analog Devices AD623AR, U9.
In QA-PT Models 2G and 2H Only. Relative humidity is measured with the Honeywell sensor HIH-3605-B, U1. This sensor has
an integrated amplifier that is connected to the A/D on the CPU.
Additionally, gas flow is measured with another Honeywell sensor
with an integrated amplifier, the AWM3303V, U17. The power
supply is connected only when required.
4.
Power supply. (Refer to Specification Drawing QA-PT Power
Supplies, page A-8). The QA-PT uses a 9V battery, or a 7-10V
net adapter. The maximum current consumption is less than 30
mA (9V). VCC is generated with a step down switch mode converter, MAX639CSA, U24.
The unit is switched ON by setting the shut down signal on U24
HIGH. The unit is switched OFF by setting the signal LOW (this is
controlled by the firmware).
The analog supply voltages are generated by using a capacitive
spennings dobler, LM2660MM, U11 on the VCC signal. Analog
5VDC (V5P) is generated with a 5.0VDC low dropout linear regulator, LP2982AIM5, U2.
The analog 8.3VDC (V8P) is generated with a 3.3VDC low dropout linear regulator, LP2982AIM33, U10 with reference to V5P.
7-2
Appendix A - Schematic Diagrams
QA-PT ................................................................................................................................................... A-2
QA-PT CPU............................................................................................................................................ A-3
QA-PT Communication........................................................................................................................... A-4
QA-PT Analog ........................................................................................................................................ A-5
QA-PT Temperature and Flow ............................................................................................................... A-6
QA-PT Pressure and Barometer ............................................................................................................ A-7
QA-PT Power Supplies........................................................................................................................... A-8
QA-PT Cables ........................................................................................................................................ A-9
QA-PT Temperature Calibration........................................................................................................... A-10
A-1
QA-PT
A-2
QA-PT CPU
A-3
QA-PT Communication
A-4
QA-PT Analog
A-5
QA-PT Temperature and Flow
A-6
QA-PT Pressure and Barometer
A-7
QA-PT Power Supplies
A-8
QA-PT Cables
Note: Cable: 3-conductorsx+shield. Shield should be connected to chassis on D-Sub.
A-9
QA-PT Temperature Simulation
A-10
USA
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Grand Rapids, MI 49505
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(+1) 888 863-8766
Fax:
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91000 Evry, France
Phone:
(+33) 1 6078 8899
Fax:
(+33) 1 6078 6839
E-mail:
info@metron.fr
From: (name)
Address:
NORWAY
Travbaneveien 1
N-7044 Trondheim, Norway
Phone: (+47) 7382 8500
Fax:
(+47) 7391 7009
E-mail: support@metron.no
Phone:
Fax:
E-mail:
Date:
Error Report
Product:
Version:
Serial no.:
Description of the situation prior to the error:
Description of the error:
(METRON AS internally)
Comments:
Received date:
Correction date:
Ref No.
Critical
Normal
Minor
B-1
USA
1345 Monroe NW, Suite 255A
Grand Rapids, MI 49505
Phone:
(+1) 888 863-8766
Fax:
(+1) 616 454-3350
E-mail:
support.us@metron-biomed.com
FRANCE
30, rue Paul Claudel
91000 Evry, France
Phone:
(+33) 1 6078 8899
Fax:
(+33) 1 6078 6839
E-mail:
info@metron.fr
From: (name)
Address:
NORWAY
Travbaneveien 1
N-7044 Trondheim, Norway
Phone: (+47) 7382 8500
Fax:
(+47) 7391 7009
E-mail: support@metron.no
Phone:
Fax:
E-mail:
Date:
Improvement Suggestion
Product:
Version:
Description of the suggested improvement:
(METRON AS internally)
Comments:
Received date:
C-1
Correction date:
Ref No.
Critical
Normal
Minor
USA
1345 Monroe NW, Suite 255A
Grand Rapids, MI 49505
Phone:
(+1) 888 863-8766
Fax:
(+1) 616 454-3350
E-mail:
support.us@metron-biomed.com
FRANCE
30, rue Paul Claudel
91000 Evry, France
Phone:
(+33) 1 6078 8899
Fax:
(+33) 1 6078 6839
E-mail:
info@metron.fr
NORWAY
Travbaneveien 1
N-7044 Trondheim, Norway
Phone: (+47) 7382 8500
Fax:
(+47) 7391 7009
E-mail: support@metron.no