WPI PM01 User manual

WORLD
PRECISION
INSTRUMENTS
PM01, PM015, PM100
Hand-held monitors for vacuum and pressure
measurement
Serial No._____________________
www.wpiinc.com
INSTRUCTION MANUAL
121219

PM01, PM015 & PM100
World Precision Instruments i
Copyright © 2019 by World Precision Instruments. All rights reserved. No part of this publication may
be reproduced or translated into any language, in any form, without prior written permission of World
Precision Instruments, Inc.
CONTENTS
ABOUT THIS MANUAL ................................................................................................................... 1
INTRODUCTION .............................................................................................................................. 1
Unpacking................................................................................................................................... 2
INSTRUMENT DESCRIPTION ........................................................................................................ 2
Controls....................................................................................................................................... 2
OPERATING INSTRUCTIONS......................................................................................................... 3
Power up..................................................................................................................................... 3
Fluid connections...................................................................................................................... 3
Dierential readings................................................................................................................. 3
What uids can be used?........................................................................................................ 3
Selecting the range................................................................................................................... 4
Zeroing ........................................................................................................................................ 4
Recording.................................................................................................................................... 4
Calibration................................................................................................................................... 4
MAINTENANCE ................................................................................................................................ 4
Replacing the battery .............................................................................................................. 4
Charging the batteries............................................................................................................. 5
SPECIFICATIONS.............................................................................................................................. 5
APPENDIX A: PRESSURE CONVERSIONS................................................................................... 6
WARRANTY ....................................................................................................................................... 7
Claims and Returns .................................................................................................................. 7
Repairs......................................................................................................................................... 7

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PM01, PM015 & PM100
World Precision Instruments 1
ABOUT THIS MANUAL
The following symbols are used in this guide:
This symbol indicates a CAUTION. Cautions warn against actions that can cause
damage to equipment. Please read these carefully.
This symbol indicates a WARNING. Warnings alert you to actions that can cause
personal injury or pose a physical threat. Please read these carefully.
NOTES and TIPS contain helpful information.
Fig. 1—Pressure Manometer
INTRODUCTION
Hand-held and battery operated, PM Series Pressure Monitors simplify vacuum and
pressure measurements. An integral transducer and digital display allow easy and
accurate pressure readings. Three separate versions measure pressures in the range
of ±1 psi, ±15 psi, or ±100 psi. A range switch allows measurement in units of psi or
kPa for the100 psi version, and psi or mmHg for the 1 and 15 psi versions. Pressure
can be read on the built-in LCD display, or monitored on the recorder output.
Standard versions are equipped with a 9V alkaline battery. Rechargeable versions use
a nickel/cadmium battery and come complete with a charger.

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Unpacking
Upon receipt of this instrument, make a thorough inspection of the contents and
check for possible damage. Missing cartons or obvious damage to cartons should be
noted on the delivery receipt before signing. Concealed damage should be reported
at once to the carrier and an inspection requested. Please read the section entitled
“Claims and Returns” on page 7 of this manual. Please contact WPI Customer
Service if any parts are missing at 941.371.1003 or [email protected].
Returns: Do not return any goods to WPI without obtaining prior approval (RMA
# required) and instructions from WPI’s Returns Department. Goods returned
(unauthorized) by collect freight may be refused. If a return shipment is necessary,
use the original container, if possible. If the original container is not available, use a
suitable substitute that is rigid and of adequate size. Wrap the instrument in paper or
plastic surrounded with at least 100mm (four inches) of shock absorbing material. For
further details, please read the section entitled “Claims and Returns” on page 7 of
this manual.
INSTRUMENT DESCRIPTION
Controls
On/O Turns instrument power on and o.
Zero Adjusts the meter reading to zero at ambient pressure.
psi/kPa Selects the pressure range; psi or kPa for the PM100, (psi/mmHg)
psi or mmHg for the PM01 and PM015.
Port A & B Inverting (Port A) and Non-inverting (Port B) inputs to the pressure
transducer.
Charger Input for the charger (rechargeable versions only).
Record Voltage output proportional to pressure.

PM01, PM015 & PM100
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OPERATING INSTRUCTIONS
WARNING: DO NOT USE ANY OF THE PM SERIES PRESSURE MONITORS
WITH WATER OR AQUEOUS SOLUTIONS, ESPECIALLY SALT
SOLUTIONS.
Power up
Turn the instrument on by moving the On/O switch to the On position. For non-
rechargeable units using alkaline batteries, battery life is approximately 200 hours.
Rechargeable units will operate for approximately 25 hours on fully-charged nickel/
cadmium batteries. The rechargeable units can be operated continuously by
connecting the charger to the charger input, either with or without batteries in the unit.
Fluid connections
Soft tubing, such as the vinyl tubing supplied with the unit, can be slipped directly
onto the barbed ports of the Pressure Monitor. The outer diameters of the ports are
0.190” (4.8 mm), so tubing can be used with inner diameters of 1/8”, 3/16” or 5/32”.
When using pressures higher than 30 psi with the PM100, the tubing clamps supplied
with the unit should be used. Insert the tubing through the clamp, and push the
tubing rmly onto the barbed port. Screw the clamp onto the tubing at the port.
Do not apply pressures greater than the proof pressure to either of the ports. For the
PM100 the proof pressure is 150 psi (1035 kPa); for the PM015 the proof pressure is
30 psi (1550 mmHg); for the PM01 the proof pressure is 20 psi (1035 mmHg).
For standard operation, pressure tubing should be connected to Port B, which will
give readings of the correct sign, positive or negative, on the meter. Readings from
Port A will always be opposite in sign to those applied.
Readings taken using just one port are relative to ambient pressure and are termed
gauge measurements (as opposed to absolute.).
Dierential readings
For dierential readings, pressure tubing may be connected to both ports. The meter
display the dierence in pressure between Port B and Port A, (Port B - Port A).
What uids can be used?
The transducer in the Pressure Monitor is compatible with most non-aqueous fuels,
oils, refrigerants, hydraulic uids, and non-corrosive gases. Fluids must generally be
compatible with silicon gel, plastic, aluminum, RTV, silicon, and glass.

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Selecting the range
Select the units displayed on the meter using the psi/kPa switch on the PM100, or the
psi/mmHg switch on the PM015 and PM01. No zeroing is necessary when the range
is switched.
Zeroing
If the Pressure Monitor drifts from a reading of zero at ambient pressure, adjust the
Zero potentiometer with a small screwdriver.
Recording
A voltage output proportional to the pressure is available at the Record output. This
voltage may be used to monitor pressure on a chart recorder, oscilloscope or other
recording equipment. Connection is made via a mini-phone plug (0.141” outer
diameter). A mini-phone-to-BNC cable is available (WPI #CLB102).
For the PM01 Pressure Monitor the Record output is 300 mV/psi (±0.3 V full scale); for
the PM015 Pressure Monitor the Record output is 100 mV/psi (±1.5 V full scale); for
the PM100 the output is 10 mV/psi (±1 V full scale).
Calibration
Calibration of the pressure readings should be unnecessary under normal
circumstances. If the Pressure Monitor appears to be out of calibration during its
warranty period, it should be returned to the factory for inspection and recalibration.
You may calibrate the instrument yourself, however this will void the warranty if it
is still in eect. First, zero the instrument at ambient pressure. Then remove the
cover by unscrewing the four screws on the back of the instrument. Apply a known
pressure to Port B of the Pressure Monitor and adjust the trimming potentiometer
labelled R11 on the circuit board until the meter displays the correct pressure. For
best accuracy the applied pressure should be at least half of the full-scale reading.
MAINTENANCE
Replacing the battery
When the battery begins to run low, a LO BAT indication will be displayed on the
meter. Remove the battery by sliding open the battery compartment on the rear
of the instrument and disengaging the old battery from the clip. Replace with a
comparable battery; a 9V alkaline type (WPI No. 2101) for the PM01D, PM015D and
PM100D, or 7.2V nickel/cadmium type (WPI No. 3414) for the PM01R, PM015R and
PM100R. Alkaline batteries may be used in the PM01R, PM015R and PM100R, but
no attempt should be made to recharge these batteries, or to use the charger while

PM01, PM015 & PM100
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these batteries are in the instrument. CHARGING AN ALKALINE CELL MAY CAUSE IT
TO EXPLODE.
Charging the batteries
Batteries may be recharged in the PM01R, PM015R and PM100R by plugging the
charging unit into a line-powered outlet and plugging the power jack of the charger
into the Pressure Monitor Charger input. Batteries may be charged with the unit
turned on or o, but the batteries will charge more slowly with the unit turned on.
The Pressure Monitor will function without a battery, if the charger is connected.
SPECIFICATIONS
This unit conforms to the following specications:
PM01 PM015 PM100
Pressure Ranges ±1 psi (±52 mmHg) ±15 psi (±775
mmHg)
±100 psi (±690 kPa)
Proof Pressure 20 psi (1035 mmHg) 30 psi (1550 mmHg) 150 psi (1035 kPa)
Resolution 0.001 psi (1 mmHg) 0.01 psi (1 mmHg) 0.1 psi (1 kPa)
Output 1V/psi 100 mV/psi 10 mV/psi
Output Range ±1.0 V ±1.5 V ±1.0 V
Linearity ....................................................... 0.5% full-scale
Temperature Eect ................................... 1.0% full-scale (0-70 C)
Zero............................................................... Screwdriver-adjust
Response Time........................................... 30 ms
Power............................................................ One 9V alkaline or rechargeable battery
Battery Life .................................................. 200 hr (alkaline battery)
25 hr (rechargeable battery)
Output Connector ..................................... Mini-phone, 0.141”
Output Impedance.................................... 1000 Ω
Pneumatic Connectors............................. Barbed, for 1/8” or 3/16” ID soft tubing
Dimensions ................................................. 3.12” (w), 5.88” (l), 1.5” (d)
Weight .......................................................... 0.5 lbs (0.25 kg)
PM Series Pressure Monitors come with 4 ft of 1/8” ID soft vinyl tubing. A mini-phone-
to-BNC cable for the Record output (WPI #CLB102) is optional. Non-rechargeable
versions contain one 9V alkaline battery. Rechargeable versions come with one nickel/
cadmium battery and a 120/240V-switchable battery charger.

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APPENDIX A: PRESSURE CONVERSIONS
psi in. H2O in. Hg kPa mBar cm H2O mmHg
psi 1.000 27.680 2.036 6.8947 68.947 70.308 51.715
in. H2O0.036127 1.0000 0.073554 0.2491 2.491 2.5400 1.8683
in. Hg 0.4912 13.596 1.000 3.3864 33.864 34.532 25.400
kPa 0.14504 4.0147 0.2953 1.000 10.000 10.1973 7.5006
mBar 0.01450 0.40147 0.02953 0.100 1.000 1.01973 0.75006
cm H2O 0.014223 0.3937 0.028958 0.09806 0.9806 1.000 0.7355
mmHg 0.019337 0.53525 0.039370 0.13332 1.3332 1.3595 1.000
NOTE: In. H2O at 39° F; in. Hg at 32° F; cm H2O at 4° C; mmHg at 0° C