PendoTECH PressureChecker PDKT-650-950 User manual

PendoTECH
PressureChecker™
Model PDKT-650-950
Revision 1
www.pendotech.com
User Guide

PendoTECH PressureChecker User Guide
Revision 1
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PendoTECH PressureChecker™User Guide
Revision 1
Copyright © 2009-2014, PendoTECH
All rights reserved. No part of this publication may be reproduced, stored in an electronic
retrieval system, or transmitted, in any form or by any means, whether electronic,
mechanical, by photocopying, or otherwise, without the written consent of PendoTECH.
The information in this User Guide is believed to be accurate and reliable for use and
operation of the monitor, however, PendoTECH assumes no responsibility for the use of
this product except for what is covered in the Limited Warranty and Terms and Condition
of Sale.
WARNING: “WARNING” is used to indicate the presence of a hazard which can
cause severe personal injury, death, or substantial property damage if the warning is
ignored
NOTE: “NOTE” is used to notify the user of installation or operation information
which is important but not hazard related.
Warning potential shock hazard. Do not submerge this product.
Protect the product before cleaning with any liquids by covering
openings that expose the internal components.
Goods and software are not designed, intended or authorized for use as components
in life support or medical devices. They are not designed for any application in which
the failure of the product could result in personal injury, death or property damage.

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Table of Contents
1. Overview of the PressureChecker........................................................................................... 4
1.1. Key Features .................................................................................................................................5
1.2. Device Details...............................................................................................................................5
1.2.1. Hardware Details ......................................................................................................................5
1.2.2. Specifications............................................................................................................................6
1.2.3. Theory of Operation..................................................................................................................7
2. Using the Device..................................................................................................................... 8
2.1. Testing sensors non-invasively.....................................................................................................8
2.2. Using as a monitor simulator to test a monitor...........................................................................11
3. Key System Components...................................................................................................... 13
3.1. Power Supply and Low Battery Indicator...................................................................................13
3.2. Precision Pressure Transducer....................................................................................................13
3.3. Display........................................................................................................................................13
3.4. Pressure Generating Cylinder .....................................................................................................13
APPENDIX A: PRODUCT WARRANTY................................................................................. 14
PENDOTECH LIMITED WARRANTY..................................................................................... 14
APPENDIX B: Service Information............................................................................................ 15

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1. Overview of the PressureChecker
The PressureChecker™ is a calibrated device that can be used to verify proper
functioning and accuracy of PendoTECH Single Use Pressure Sensors and monitors
non-invasively. It can be used to test the sensors in-situ without the requirement to
access the fluid path. In its small, hand-held enclosure are all the devices necessary to
perform the required function. PendoTECH Pressure Sensors are 100% tested at
several points in the manufacturing process, however, this device gives the ability to
verify the performance of the sensor by the end-user. PendoTECH Pressure Sensors
are also frequently used on single use bioreactors to measure pressure in the bag. The
required resolution is often less than 1 psi and the PressureChecker has the readability
and ability to regulate pressure in this range. It also has an internal pressure sensor
simulator and can be used to verify proper functioning of monitors such as the
PressureMAT™, PendoTECH Process Control Systems, or 3rd party monitors.
There are numerous applications in biopharmaceutical production processes where the
device can be used.
System Components Supplied:
PDKT-650-950 PressureChecker pressure sensor and monitor verification tool
(with 9V alkaline battery)
PDKT-650-905 4 foot connecting tube with luer slip
Calibration Certificate

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1.1. Key Features
The PressureChecker incorporates a specially designed pressure cylinder and precision solid-state
transducer for generating and measuring static pressure from -7 to +10.5 psi. The adjustment knob is used
to regulate the pressure, and the pressure value is shown on the liquid crystal display. A built-in
pneumatic port provides the external connection for fittings to connect to the sensor test port.
Verify proper functioning of sensor and monitors
Verify proper function of sensor in-situ by accessing the atmospheric reference side of sensor
NIST Traceable
Can be returned for annual calibration
Battery operated for portability
1.2. Device Details
1.2.1. Hardware Details
Device details are as shown:
Monitor
Connector
Pneumatic
Port
ON/OFF
Switch
Adjustment
Knob
Zero
Adjust
LCD
The connections on the left side panel are as shown below:
Monitor
connector Pneumatic Port
with cap in place

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The control functions are on the right side panel as shown below:
Adjustment
Knob
Zero
Adjustment ON / OFF
Switch
1.2.2.Specifications

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1.2.3.Theory of Operation
Positive and vacuum pressures can be generated within the PressureChecker and applied to a system
under test. The pressure delivered is indicated on PressureChecker’s liquid crystal display for quick
comparison to the monitor. By applying a vacuum to the sensor test port, the linearity, and accuracy of
the pressure sensor can be tested. Since the pressure sensor is a true differential device (measures gauge
pressure relative to atmosphere), applying vacuum is equivalent to applying a pressure to the fluid path so
the system can be checked to verify calibration very easily without accessing the fluid path or breaking
sterility if a sterile fluid path. Even though it may not be possible to test the entire range of the pressure
sensor, the proper function and sensor output accuracy of 0.2584 mV/psi/V can be verified to be within
accuracy specification because this applies across the range of sensor pressures.
The pressure sensor simulator, which is housed inside PressureChecker’s monitor connector, is a pressure
sensor of the same type as that used in the PendoTECH Single User Pressure Sensor . When using the
exclusive simulator feature of the PressureChecker, the pressure sensor is replaced with a device having
the same operating characteristics and not with a device which “simulates” only some of its operating
characteristics. A pressure (or vacuum) generated internally by PressureChecker’s pneumatic pump, is
applied to both the precision pressure transducer (which is connected to the 3.5 inch display) and to the
pressure sensor simulator. Referencing the diagram, the signal from the precision pressure transducer is
sent to the panel meter circuit, where it is converted from an analog voltage to a digital number and
displayed in psi on the LCD readout. The signal from the sensor simulator is sent to the monitor to which
it is connected, and from which it receives its excitation power. The monitor and LCD are then compared.
Black
adjustment
knob Pneumatic
pump
Pneumatic pressure / vacuum lines
Pressure Sensor
Simulator
Precision Pressure
Sensor Circuit 3.5 inch LCD
Pneumatic Port

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2. Using the Device
2.1. Testing sensors non-invasively
Positive and vacuum pressures can be generated within PressureChecker and applied to a sensor
under test. The pressure delivered is indicated on PressureChecker’s liquid crystal display for quick
comparison to the monitor. By applying a vacuum to the sensor test port, the linearity and accuracy of
the pressure sensor can be tested. Since the pressure sensor is a true differential device (measures
gauge pressure relative to atmosphere), applying vacuum is equivalent to applying a pressure to the
fluid path so the system can be checked to verify calibration very easily without accessing the fluid
path or breaking sterility if a sterile fluid path. Even though it may not be possible to test the entire
range of the pressure sensor, the proper function and sensor output accuracy of 0.2584 mV/psi/V can
be verified to be within accuracy specification because this applies across the range of sensor
pressures to 30 psi. Beyond the 30 psi, there is a non-linear output that both the PressureMAT and
PendoTECH Control Systems can interpret and display the actual pressure reading. Regardless, the
PressureChecker only can be used in its specified range which is below 30 psi.
NOTE: During the following steps the fluid path of the sensor must be exposed to atmosphere
Steps:
1. Connect the sensor to the monitor cable
2. Connect the 4 foot air tube with stop cock and slip luer on one end to the sensor test port and the
PressureChecker pneumatic port on the other end.
3. Zero the system- properly zeroing the system is important for accuracy determination. To zero do
the following:
a. Position the handle on the stopcock to vent both the sensor and pneumatic port to
atmosphere.
b. Tare the sensor at the monitor per its operating instructions
c. If the PressureChecker display does not read 0.00, turn the zero adjustment located on the
right side using a small screwdriver

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d. When both the monitor and PressureChecker read zero, position the stop cock as shown
and the sensor and setup is ready for testing:
WARNING: IF THE SYSTEM APPEARS TO BE LOSING PRESSURE,
CAREFULLY CHECK ALL FITTINGS AND CONNECTIONS
WARNING: DURING THIS TESTING DO NOT EXCEED +7 PSI OR THE SENSOR
UNDER TEST MAY BE DAMAGED.
WARNING: DURING THIS TESTING DO NOT APPLY LESS THAN -7 PSI OR THE
PRESSURE SENSOR SIMULATOR MAY BE DAMAGED.
4. As pressure is generated by turning the adjustment knob, the pressure applied to the sensor is
indicated on the PressureChecker display. This pressure reading is compared to the reading on
the monitor to determine the sensor and setup accuracy.
Sensor
test port
Pneumatic Port Adjustment
Knob
LCD
reading
Monitor
reading
Sensor
under
test

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5. Interpretation of Results
Determining if a pressure sensor it accurate requires only one measurement at a known amount of
applied pressure. This involves the following steps:
a. Apply a pressure from -6 psi to +6 psi as indicated on the PressureChecker display
b. Record the pressure from the monitor display
c. From the accuracy specification on each item in the setup (sensor, monitor,
PressureChecker) determine the maximum allowable deviation in pressure.
d. Compare the results from step “b” with step “c”. If the results from “b” fall into the range
calculated in “c”, the sensor under test is within the specification.
Example on calculation of allowable deviation:
PressureChecker accuracy specification: 1% of reading
Pressure Sensor accuracy specification: 2% of reading
PressureMAT monitor accuracy specification: 1% of reading
ALLOWABLE DEVIATION = 4% of reading
e. A linearity graph may also be plotted to verify linearity. Plot the results of monitor
reading versus PressureChecker reading in the range of 0 psi to 6 psi (0 psi to -6 psi on
the PressureChecker) to verify the linearity.