INW PT2X
Pressure/Temperature Smart Sensor and Datalogger
INSTRUCTION MANUAL
For PSIG
sensors, refer
to page 12
regarding
desiccant
use!
INW - PT2X Instruction Manual 1
Table of Contents
Introduction ......................................................................................................................3
What is the PT2X? .....................................................................................................3
Initial Inspection and Handling .................................................................................3
Do’s and Don’ts .........................................................................................................4
How Pressure Sensors Work ......................................................................................4
Installation and Operation .................................................................................................6
Connecting External Power .......................................................................................6
Connecting the PT2X to a Computer .........................................................................6
Installing the Aqua4Plus or Aqua4Plus Lite Software ..............................................7
Installing the Sensor ..................................................................................................7
Battery Life Calculator ..............................................................................................8
Collecting Data ..........................................................................................................8
Maintenance ....................................................................................................................12
Changing Batteries ...................................................................................................12
Removing Debris from End Cone ...........................................................................12
Desiccant Tubes .......................................................................................................13
Miscellaneous ..........................................................................................................14
Trouble Shooting .............................................................................................................14
Erratic Readings .......................................................................................................14
Oscillating Readings Over Time ..............................................................................15
Zero Readings When Pressurized ............................................................................15
Grounding Issues .....................................................................................................15
Appendix A: Technical Specifi cations ............................................................................16
Wiring and Component Information ........................................................................16
Dimensions and Specifi cations ................................................................................17
Continuous Rate and Filter Settings ........................................................................19
Appendix B: Settings and Calibration ...........................................................................20
Preparation ...............................................................................................................20
Submergence ............................................................................................................22
Depth-to-W ater ........................................................................................................23
Elevation Above Sea Level ......................................................................................24
Staff Gauge ..............................................................................................................25
Appendix C: Alternate Connection Options ...................................................................26
Connecting via RS232 Serial Port ...........................................................................26
Connecting with a USB/Serial Adapter ...................................................................26
Appendix D: Reading the PT2X via Direct Read ..........................................................28
Setting Units for Direct Read ..................................................................................28
Power Consideration ................................................................................................29
Reading V ia Modbus
®
RTU .....................................................................................29
Reading V ia SDI-12 .................................................................................................31
Appendix E: Battery Changing Details ...........................................................................33
Reordering Information ..................................................................................................38
Limited Warranty/Disclaimer - INW PT2X Pressure/Temperature Sensor ....................39
2 INW - PT2X Instruction Manual
Information in this document is subject to change without notice and does not
represent a commitment on the part of the manufacturer. No part of this manual may
be reproduced or transmitted in any form or by any means, electronic or mechanical,
including photocopying and recording, for any purpose without the express written
permission of the manufacturer.
©1997 - 2016 Seametrics. All rights reserved.
Registered trademarks and trademarks belong to their respective owners.
INW - PT2X Instruction Manual 3
Introduction
What is the PT2X?
INW’ s AquiStar® PT2X Smart Sensor is an integrated datalogger and pressure/
temperature sensor and is ideal for monitoring groundwater, well, tank, and tidal
levels, as well as for pump and slug testing. This sensor networks with all of the INW
AquiStar
®
Smart Sensor family. Its compatibility with INW’s Wireless Data Collection
technology makes it ideal for remote monitoring.
This industry standard digital RS485 interface device records up to 520,000 records of
pressure, temperature, and time data, operates with low power, and features easy-touse software with powerful features. Constructed with 316 stainless steel or titanium,
PTFE, and fl uoropolymer, this sensor provides high-accuracy readings in rugged and
corrosive fi eld conditions.
Two internal AA batteries power the PT2X. (Auxiliary power supplies are available
for data intensive applications.) The unit is programmed using INW’s easy-to-use
Aqua4Plus or Aqua4Plus Lite control software. Once programmed the unit will
measure and collect data on a variety of time intervals.
Replace your analog sensor / datalogger with the AquiStar® PT2X as a stand-alone
unit or network with other INW Smart Sensors. Most users will use the PT2X with
INW’s Aqua4Plus or Aqua4Plus Lite software. However, the PT2X is quite versatile,
communicating via either Modbus® or SDI-12 interfaces, allowing you to do the
following:
• Read a PT2X via the Modbus
®
protocol using your own software.
• Read a PT2X via SDI-12 protocol.
• Display readings from a PT2X on a panel meter.
Initial Inspection and Handling
Upon receipt of your smart sensor, inspect the shipping package for damage. If any
damage is apparent, note the signs of damage on the appropriate shipping form. After
opening the carton, look for concealed damage, such as a cut cable. If concealed
damage is found, immediately fi le a claim with the carrier.
Check the etched label on the sensor to be sure that the proper range and type were
provided. Also check the label attached to the cable at the connector end for the proper
cable length.
4 INW - PT2X Instruction Manual
Do’s and Don’ts
How Pressure Sensors Work
Liquids and gasses do not retain a fi xed shape. Both have the ability to fl ow and are
often referred to as fl uids. One fundamental law for a fl uid is that the fl uid exerts an
equal pressure in all directions at a given level. Further, this pressure increases with
an increasing depth of “submergence”. If the density of a fl uid remains constant
(noncompressible...a generally good assumption for water at “normal” pressures and
temperatures), this pressure increases linearly with the depth of “submergence”.
We are all “submerged” in the atmosphere. As we increase our elevation, the pressure
exerted on our bodies decreases as there is less of this fl uid above us. It should be
noted that atmospheric pressure at a given level does vary with changes in the weather.
One standard atmosphere (pressure at sea level at 20º C) is defi ned to be 14.7 PSI
(pounds per square inch).
There are several methods to reference a pressure measurement. Absolute pressure is
measured with respect to an ideal vacuum (no pressure). Gauge pressure is the most
common way we express pressure in every day life and is the pressure exerted over and
above atmospheric pressure. With this in mind, gauge pressure (Pg) can be expressed
as the difference between the absolute pressure (Pa) and atmospheric pressure (Patm):
Pg = Pa - Patm.
To measure gauge pressure, atmospheric pressure is subjected to one side of the
system and the pressure to be measured is subjected to the other. The result is that the
differential (gauge pressure) is measured. A tire pressure gauge is a common example
of this type of device.
Recall that as the level of submergence increases (in a noncompressible fl uid), the
pressure increases linearly. Also, recall that changes in weather cause the absolute
atmospheric pressure to change. In water, the absolute pressure (Pa) at some level of
depth (d) is given as follows:
Pa = Patm + kd
where k is simply a constant (i.e.: 2.307 feet of water = 1 PSI)
Don’t support the device with the connector.
Use a strain relief device to take the
tension off the connectors.
Don’t allow the device to free-fall down a
well as impact damage can occur.
Don’t bang or drop the device on hard
objects.
Do handle the device with care.
Do store the device in a dry, inside area
when not in use.
Do install a desiccant tube if using a gauge
sensor.
Do install the device so that the connector
end is kept dry.
INW - PT2X Instruction Manual 5
INW’s standard gauge submersible pressure devices utilize a vent tube in the cable
to allow the device to reference atmospheric pressure. The resulting gauge pressure
measurement refl ects only the depth of submergence. That is, the net pressure on the
diaphragm is due entirely to the depth of submergence.
Pressure Diagram: See detail A.
Absolute pressure is given as Pa = Patm + kd
(where k is 2.307 feet of water)
6 INW - PT2X Instruction Manual
Installation and Operation
Connecting External Power
The PT2X comes with two AA internal batteries.
If auxiliary power is desired, you can use a 6 - 13 VDC supply that can provide 15
mA. Connect to Vaux++ (pin 1 - white) and Ground (pin 5 - blue) or contact INW for
auxiliary power supplies.
Connecting the PT2X to a Computer
In its cabled confi guration, the sensor
cable is terminated with a weather-resistant
connector. In its cableless confi guration, the sensor is terminated with a weather-
resistant connector inside a screw-cap. Connect the weather-resistant connector to
your computer’s USB port as shown below. (For alternate connection options, see
Appendix C.)
Connect the sensor to your PC using INW’s USB to RS485
adapter. (See Appendix C for alternate connections.)
PC or Laptop
Computer
USB Port
USB to RS485
Adapter
Sensor
Cableless
Confi guration
Screw-
Sensor
cap
INW - PT2X Instruction Manual 7
Installing the Aqua4Plus or Aqua4Plus Lite Software
The PT2X comes with the Aqua4Plus or Aqua4Plus Lite host software that is installed
on your PC or laptop. Use this software to program the datalogger, to retrieve data
from the logger, to view collected data, and to export data to external fi les for use with
spreadsheets or databases.
Refer to the software manuals for details on installing and using Aqua4Plus or
Aqua4Plus Lite.
Using the PT2X Without Aqua4Plus or Aqua4Plus Lite
Most users will use the PT2X with INW’s Aqua4Plus or Aqua4Plus Lite software.
However, the PT2X is quite versatile, communicating via either Modbus
®
or SDI-12
interfaces, allowing you to do the following:
• Read a PT2X via the Modbus
®
protocol using your own software.
• Read a PT2X via SDI-12 protocol.
• Display readings from a PT2X on a panel meter.
If you want to use one of these methods, see Appendix D.
Installing the Sensor
The PT2X measures pressure. The most common application is measuring liquid
levels in wells and tanks. In order to do this, the sensor must be installed below the
water level at a fi xed depth. The installation depth depends on the range of the sensor.
One (1) PSI is equal to approximately 2.31 feet of water. If you have a 5 PSI sensor,
the range is 11.55 feet of water and the sensor should not be installed at a depth below
11.55 feet. If the sensor is installed below its maximum range, damage may result to
the sensor and the output reading will not be correct.
Lower the sensor to the desired depth. Fasten the cable to the well head using tie
wraps or a weather proof strain-relief system. When securing a vented cable, make
sure not to pinch the cable too tightly or the vent tube inside the cable jacket may
be sealed off. Take a measurement to insure the sensor is not installed below its
maximum range.
Be sure the supplied cap is securely placed on the weather-resistant connector at the
top of the cable. Do not install such that the connector might become submerged with
changing weather conditions. The connector can withstand incidental splashing but is
not designed to be submerged.
For vented sensors, install the sensor so that the desiccant tube will not fl ood or lie in
water.
8 INW - PT2X Instruction Manual
The sensor can be installed in any position; however, when it leaves the factory it is
tested in the vertical position. Strapping the sensor body with tie wraps or tape will not
hurt it. INW can provide an optional 1/4” NPT input adapter which is interchangeable
with the standard end cone for those applications where it is necessary to directly attach
the sensor to a pipe, tank, or other pipe port. If the sensor is being installed in a fl uid
environment other than water, be sure to check the compatibility of the fl uid with the
wetted parts of the sensor.
Battery Life Calculator
IMPORTANT NOTE for PT2X sensors with fi rmware 2.13 or higher!
PT2Xs with fi rmware version 2.13 and higher have a battery life calculator that is
set at the factory when batteries are fi rst put in the sensor. If you need to replace the
batteries, see Appendix E for replacement information and for information on resetting
the battery life calculator. If the battery life calculator is not reset, the remaining life
information will be incorrect.
Collecting Data
Following is a brief overview on using Aqua4Plus/Aqua4Plus Lite to collect data.
Please refer to the software instruction manuals for further details on confi guring and
using Aqua4Plus/Aqua4Plus Lite.
Real Time Monitor
Click Single to get a single reading.
Click Start to get a reading once a second for 60 seconds.
Click Stop to stop the reading.
Note: These are snapshot readings and are not recorded on the sensor. On sensors
with fi rmware versions lower than 2.0, the pressure is displayed in the fi rst column
and temperature in the second. On sensors with fi rmware versions 2.0 and higher, the
temperature is displayed in the fi rst column and pressure in the second.
INW - PT2X Instruction Manual 9
The Real Time Monitor gives a snapshot of the
current readings on the sensor.
Setting up Data Recording
Click the tool button. A Logging Schedule Window will open. Refer to the
software instruction manuals for details in describing your schedule. Click the Start
button to save the schedule to the sensor and begin recording.
Using the Logging Schedule Window, describe
the test steps for your particular test.
10 INW - PT2X Instruction Manual
Retrieving Data from the Sensor/Datalogger
• Click on the fi le you want to retrieve.
• Click the tool button.
• Select a fi le location.
• Click Save.
• Click Start.
Select the data fi le to retrieve.
Viewing Data
• Click the or tool button to view data as a table.
• Click the tool button to view data as a graph.
• Navigate to the desired fi le, then click the Open button.
The File Display window displays your
data in a tabular format.
INW - PT2X Instruction Manual 11
The Graph Window displays your data on an X Y
coordinate graph.
Exporting Data to .csv or .xls Files
• Click the or tool button to view data as a table.
• Click on the tool button.
• Select a fi le location and enter a name for the fi le.
• Select a fi le type.
• Click Save.
A Word About Units
Readings from the PT2X Smart Sensor can be displayed in various units, such as PSI,
Ft. H2O, or mm H2O for pressure, or degrees Celsius or degrees Fahrenheit for
temperature. Select the units you want from the Options | Display Units menu or from
the Confi gure Menu | Program Confi guration | Set Computer Display Units.
12 INW - PT2X Instruction Manual
Maintenance
Changing Batteries
Battery Type: Two 1.5V AA batteries.
Because changing the batteries involves opening the water-tight seal, this must be
done in a clean, dry environment to avoid contamination or moisture damage to
the circuitry.
Refer to Appendix E for details on opening the housing and replacing the batteries.
Removing Debris from End Cone
At times mud, silt, or other debris may foul the water inlets to the pressure element.
The end cone can be removed to clean out the debris.
Twist Open Housing
1. Gently twist off end cone portion only - do not twist off pressure element!
2. Remove debris. Take care not to poke anything into the sensor. This can
damage the sensor element and void the warranty.
3. Replace and retighten the end cone.
Gently twist off the end cone, and then carefully remove debris.
Pressure element
Water inlet
End cone
PREVENT BATTERY LEAKAGE!
Under some circumstances the internal batteries can leak, causing damage
to the sensor. To prevent leakage, the following is recommended. (Does not
apply to lithium batteries.)
• Change the batteries at least every 18 months.
• If the sensor will not be deployed for 3 months or more, remove the
batteries.
INW - PT2X Instruction Manual 13
Set Screw Housing
1. Remove the two set screws at the bottom of the housing tube, using a 1/16” allen
wrench.
2. Gently remove the end cone.
3. Remove debris. Take care not to poke anything into the sensor. This can
damage the sensor element and void the warranty.
4. Replace the end cone and secure with set screws.
Remove end cone by removing set screws. Gently clean out debris.
Desiccant Tubes
On vented sensors, inspect the desiccant tube at least once every two months. The
desiccant tube prevents moisture in the air from being sucked into the vent tube, which
can cause erratic readings and sensor damage.
The desiccant tube is fi lled with blue silica gel beads. A locking barb and a hydrophobic
water fi lter are attached to the end of the desiccant tube. This fi lter prolongs the life of
the desiccant as much as three times over a desiccant tube without the fi lter.
Install the sensor so that the desiccant tube and cable connector will not fl ood or lie in
water.
The desiccant is a bright blue color when active and dry. As moisture is absorbed the
color will begin to fade, becoming a light pink, which indicates full saturation and time
to replace. Replacement desiccant and hydrophobic fi lters can be purchased from INW;
please contact an INW sales engineer for more information.
To Change the Desiccant:
• Pulling gently remove the black tube fi tting from the clear desiccant tube.
• Using needle-nose pliers, remove the dark gray foam plug. Do not discard the
plug.
• Dump out the old desiccant beads and refi ll with new desiccant beads – tapping
desiccant tube frequently during refi lling to ensure that the beads are fully seated
in tube.
• Push the foam plug back into the tube.
• Reinsert the black fi tting.
Pressure element
Water inlet
End cone
Set screw
14 INW - PT2X Instruction Manual
Change the desiccant by gently removing the black
tube fi tting and the dark gray foam plug.
Miscellaneous
Sensor: There are no user-serviceable parts, other than the batteries. If problems
develop with sensor stability or accuracy, contact INW. If the transducers have
been exposed to hazardous materials, do not return them without notifi cation and
authorization.
Cable: Cable can be damaged by abrasion, sharp objects, twisting, crimping, crushing,
or pulling. Take care during installation and use to avoid cable damage. If a section
of cable is damaged, it is recommended that you send your sensor back to replace the
cable harness assembly.
End Connections: The contact areas (pins & sockets) of the connectors will wear out
with extensive use. If your application requires repeated connections other types of
connectors can be provided. The connectors used by INW are not submersible, but are
designed to be splash-resistant.
Trouble Shooting
Erratic Readings
Erratic readings can be caused by a poor connection, damaged cable, moisture in the
unit, or a damaged transmitter. In most cases, erratic readings are due to moisture
getting into the system. The fi rst thing to check is the connection. Look for moisture
between contacts or a loose or broken wire. Next, check the cable for cracking or
fraying. If the connections and cable appear OK, but the readings are still erratic,
the transmitter may be damaged. Contact INW for evaluation and repair. Erratic and
erroneous readings can also occur due to improper grounding. See Grounding Issues,
below.
INW - PT2X Instruction Manual 15
Oscillating Readings Over Time
If, after time, your transmitter is functioning normally but your data is showing a
cyclic effect in the absence of water level changes, you are probably seeing barometric
changes. The amount is usually .5 to 1.5 feet of water. This can be caused by a plugged
vent tube in the cable or actual water level changes in the aquifer itself in response
to barometric pressure changes. This effect can occur in tight formations where the
transmitter will immediately pick up barometric changes but the aquifer will not. If
you think you are having this type of problem you will have to record the barometric
pressure as well as the water level pressure and compensate the data. If it appears that
the vent tube is plugged, consult the factory.
If a desiccant tube is not installed in line with the cable, water may have condensed in
your vent tube causing it to plug. After you are fi nished installing the desiccant tube you
can test the vent tube by applying a small amount of pressure to the end of the desiccant
tube and seeing if this affects the transmitter reading.
Zero Readings When Pressurized
Continuous zero readings are usually caused by an open circuit which may indicate
a broken cable, a bad connection, or possibly a damaged transmitter. Check the
connector to see if a wire has become loose or if the cable has been cut. If damage is
not readily apparent, contact INW for evaluation and repair.
Grounding Issues
It is commonly known that when using electronic equipment, both personnel and
equipment need to be protected from high power spikes that may be caused by
lightning, power line surges, or faulty equipment. Without a proper grounding system, a
power spike will fi nd the path of least resistance to earth ground – whether that path is
through sensitive electronic equipment or the person operating the equipment. In order
to ensure safety and prevent equipment damage, a grounding system must be used to
provide a low resistance path to ground.
When using several pieces of interconnected equipment, each of which may have its
own ground, problems with noise, signal interference, and erroneous readings may
be noted. This is caused by a condition known as a Ground Loop. Because of natural
resistance in the earth between the grounding points, current can fl ow between the
points, creating an unexpected voltage difference and resulting erroneous readings.
The single most important step in minimizing a ground loop is to tie all equipment
(sensors, dataloggers, external power sources, and any other associated equipment) to a
single common grounding point. INW recommends connecting the shield to ground
at the connector end.
16 INW - PT2X Instruction Manual
Appendix A: Technical Specifi cations
The AquiStar® PT2X is a microprocessor based digital intelligent sensor designed
to measure and record pressure, temperature, and time, utilizing state-of-the-art low
power, battery operated circuitry.
Pressure is measured with an extremely rugged and stable piezo-electric media-isolated
pressure element combined with a 16-bit analog-to-digital converter. This provides
extremely accurate and stable pressure input into the microprocessor on the circuit
board. Temperature is measured with a digital temperature chip. The data is stored in
non-volatile memory. A serial communication link (RS485) provides communication to
the host computer.
Wiring and Component Information
White
Purple
Yellow
Brown
Blue
Shield
(may be green)
12 VDC+ (Vaux)
Modbus D- (Not used)
Modbus D+ (Not used)
SDI-12 Signal
12 VDC – (Gnd)
Earth ground
White
Purple
Yellow
Brown
Blue
Shield
12 VDC+ (Vaux)
Modbus D- (Not used)
Modbus D+ (Not used)
SDI-12 Signal
12 VDC – (Gnd)
1
2
3
4
5
5-Pin
Connector
White
Purple
Yellow
Brown
Blue
Shield
12 VDC+ (Vaux)
Modbus DModbus D+
SDI-12 (Not used)
Ground
1
2
3
4
5
5-Pin
Connector
White
Purple
Yellow
Brown
Blue
Shield
12 VDC+ (Vaux)
Modbus DModbus D+
Digital I/O (Not used)
Ground
1
2
3
4
5
5-Pin
Connector
For Modbus® with
fi rmware lower than 2.0
— with 5-pin connector
For Modbus
®
with
fi rmware 2.0 or higher —
with 5-pin connector
For SDI-12 with
fi rmware 2.0 or higher
— with 5-pin connector
For SDI-12 with
fi rmware 2.0 or higher
— without connector
INW - PT2X Instruction Manual 17
Dimensions and Specifi cations
GENERAL
LOGGING
Length w/batteries
12.18” (30.9 cm)
Length w/o batteries
8.37” (21.3 cm)
Cableless 0.25” (0.6 cm) shorter
Diameter 0.75” (1.9 cm)
Weight 0.8 lb. (0.4 kg)
Body Material Acetal & 316 stainless steel or titanium
Wire Seal Material Fluoropolymer and PTFE
Submersible Cable Polyurethane, polyethylene,
or FEP available
Protection Rating IP68, NEMA 6P
Desiccant 1-3 mm indicating silica gel (high or standard
capacity)
Terminating Connector Available
Communication RS485 Modbus
®
RTU
SDI-12 (ver.1.3)
Direct Modbus Read Output 32-bit IEEE fl oating point
SDI-12 Output ASCII
Internal Math 32-bit fl oating point
Operating Temp. Range
(Requires freeze protection kit if in
water below freezing)
-15° C to 55° C
Storage Temp. Range
(Storage without batteries)
-40° C to 80° C
Memory 4MB - 520,000 records
Log Types Variable, user-defi ned,
logarithmic, profi led
Programmable Baud Rate 9600, 19200, 38400
Logging Rate 8x/sec maximum
Software Complimentary Aqua4Plus or Aqua4Push
Networking 32 available addresses per junction w/ batching
capabilities (up to 255)
File Formats .xls / .csv / .a4d
18 INW - PT2X Instruction Manual
POWER
TEMPERATURE
PRESSURE
Internal Battery 2x1.5V AA alkaline or lithium
Auxiliary Power 12 VDC - Nominal
6-15VDC - Range
Exp. Alkaline Battery Life 18 months at 15m polling interval
(May vary due to environmental factors)
Element Type Digital IC on board
Accuracy ± 0.5° C
Resolution 0.1° C
Range -40° C to 80° C
Units Celsius, Fahrenheit, Kelvin
Transducer Type Silicon strain gauge
Transducer Material 316 stainless steel
or
titanium
Pressure Ranges
1
Gauge
PSI
FtH2O
mH2O
Absolute
3
PSI
FtH2O
mH2O
12, 5, 15, 30, 50, 100, 300
2.32, 12, 35, 69, 115, 231, 692
0.72, 3.5, 10.5, 21, 35, 70, 210
30, 50, 100, 300
35, 81, 196, 658
3.5, 10, 24, 59, 200
Units PSI, FtH2O, inH2O, cmH2O,
mmH2O, mH2O, inHg, cmHg, mmHg, Bars,
mBars, kPa
Static Accuracy ± 0.05% FSO (typical)
± 0.1% FSO (maximum)
(B.F.S.L. 20° C)
Resolution 0.0034% FS (typical)
Maximum Operating Pressure 1.1 x FS
Over Range Protection 3x FS (for >300psi, contact INW)
(Approx. 650 feet or 200 meters)
Burst Pressure 1000psi (Approx. 2000 feet or 600 meters)
Compensated Range 0° C to 40° C
1
Higher pressure ranges available upon request
2
± 0.25% accuracy FSO (max) at this range
3
Depth range for absolute sensors has 14.7 PSI subtracted to give actual depth allowed.
INW - PT2X Instruction Manual 19
Continuous Rate and Filter Settings
Continuous Rate:
The PT2X can take readings more often than once per second. This is known as a
“continuous rate.” Set the continuous rate for the PT2X from the Confi gure Menu |
Sensor Continuous Rate.
Firmware Version Available settings
1.0 and above Exactly 2, 4, or 8 readings per second
0.22, 0.23, 0.24 Approximately 2, 3, 4, 5, 6, or 10 readings per second
0.18 Approximately 10 readings per second
To use the continuous rate during recording, enter a “c” in the Polling Interval on the
Logging Schedule.
Filter Settings:
The PT2X has the ability to apply some fi ltering to incoming data in order to smooth
out minor variations in readings. This fi lter can be from 1 (no fi ltering) to 8 (maximum
fi ltering.) Different versions of fi rmware have different fi ltering options as shown
below. For further information on PT2X data fi ltering, see INW application note Filter
Response on PT2X Smart Sensor (9C0530).
Firmware Version Filtering
1.3 and above Can be set from 1 (no fi ltering) to 8 (maximum fi ltering) from the
Advanced option on the Confi gure menu.
1.0 - 1.2 Filter is set to 1 (no fi ltering). Adjustable fi ltering can be
obtained by upgrading to a higher fi rmware version.
0.24 Filter is permanently set to 1 (no fi ltering).
0.23 and lower Filter is permanently set to 8 (maximum fi ltering).
20 INW - PT2X Instruction Manual
Appendix B: Settings and Calibration
Settings and calibration values can only be changed when there is no data on the sensor.
Be sure to retrieve any data and then erase the data on the sensor before proceeding.
The temperature channel rarely needs adjustment. If you think your temperature
channel needs calibrating, contact your service representative.
Before leaving the factory, your PT2X has been inspected using precision instruments.
However, you may want to change some of the settings for the pressure channel for the
following reasons:
• To set a specifi c zero-reference point for submergence
• To return values as depth-to-water
• To return values as elevation in relation to sea-level
• To return values relative to a staff gauge
Preparation
• Run Aqua4Plus Lite or Aqua4Plus and scan for sensors.
• On the Sensor Map, click the sensor you want to adjust.
• From Aqua4Plus Lite:
o Select the units you want to use for measurements, i.e., psi, feet of
water, inches of mercury, etc. Set this from the Confi gure Menu |
Program Confi guration | Set Computer Display Units.
o Open the Settings and Calibration window by clicking on the
Settings button .
• From Aqua4Plus:
o Select the units you want to use for measurements, i.e., psi, feet of
water, inches of mercury, etc. Set this from the Options Menu | Display
Units.
o Open the Settings and Calibration window from the Confi gure Menu |
Settings and Calibration.
Select the setting type from the Select Setting Type dropdown box. A picture will
display illustrating the type of selection. Step-by-step instructions will be displayed on
the right.
INW - PT2X Instruction Manual 21
Sample Settings and Calibration Window
22 INW - PT2X Instruction Manual
Submergence
One-Point Calibration:
-- Computing Offset --
• Place sensor in the fl uid you are measuring at a precise known level.
• In the Ref box for the fi rst point, enter this level or pressure.
• Click fi rst Measure button.
• When readings have stabilized, click the Accept button in the pop-up box.
-- Applying Offset --
• Click the Apply button to apply calculated offset.
• The calculated offset will be transferred to the offset fi eld near the top of the
window.
• Click OK to save the value to the sensor!!!
Two-Point Calibration:
-- Compute First Calibration Point --
• Place sensor in the fl uid you are measuring at a precise known level.
• In the Ref box for the fi rst point, enter this level or pressure.
• Click fi rst Measure button.
• When readings have stabilized, click the Accept button in the pop-up box.
-- Compute Second Calibration Point --
• Place sensor in the fl uid you are measuring at a second precise known level.
• In the Ref box for the second point, enter this level or pressure.
• Click second Measure button.
• When readings have stabilized, click the Accept button in the pop-up box.
-- Applying Slope and Offset --
• Click the Apply button to apply calculated values.
• The calculated slope and offset will be transferred to the fi elds near the top of
the window.
• Click OK to save the value to the sensor!!!
-- Verifying Settings --
• Using the Real Time Monitor, take a few readings to verify it is reading as
expected.
IMPORTANT NOTE!
When taking readings on an absolute sensor, you will need to SUBRACT
the current barometric pressure to get submergence. See the Barometric
Compensation Utility Application Note (9C0275) for information on how the
Barometric Utility can help automate this process.
INW - PT2X Instruction Manual 23
Depth-to-Water
When using the Depth-to-Water setting, you may want to change the channel label at
the top of the Settings window to read “Depth” or “Depth-to-Water”.
NOTE: Be sure to use the same units for all measurements in this calculation. For
example, if you have the program set to display in Ft H2O then be sure to enter the
barometric pressure and depth-to-water readings in Ft H2O.
-- Computing Offset --
• If you are using an absolut sensor, enter the current barometric pressure in the
Barometric box.
• Place the sensor in the well.
• Using a water level indicator or other measuring device, determine the depth-to-
water from the top of the well (or other reference point).
• Enter this value in the DTW box.
• Click the Measure button.
• When readings have stabilized, click the Accept button in the pop-up box.
-- Applying the Slope and Offset --
• Click the Apply button to apply the calculated values.
• The calculated slope and offset will be transferred to the fi elds near the top of the
window.
• Click OK to save the values to the sensor!!!
-- Verifying Settings --
• Using the Real Time Monitor, take a few readings to verify it is reading as
expected.
IMPORTANT NOTE!
When taking readings on an absolute sensor, you will need to ADD the
current barometric pressure to the sensor reading to get depth-to-water.
See the Barometric Compensation Utility Application Note (9C0275) for
information on how the Barometric Utility can help automate this process.
24 INW - PT2X Instruction Manual
Elevation Above Sea Level
When using the Elevation setting, you may want to change the channel label at the top
of the Settings window to read “Elevation”.
NOTE: Be sure to use the same units for all measurements on this page. For example,
if you have the program set to display in Ft H2O then be sure to enter the elevation,
barometric pressure, and depth-to-water in Ft H2O.
-- Computing Offset --
• Enter the elevation of the top of the well (or other reference point).
• If using an absolute sensor, enter the current barometric pressure in the
Barometric box.
• Place the sensor in the well.
• Using a water level indicator or other measuring device, determine the depth-towater from the top of the well (or other reference point).
• Enter this value in the DTW box.
• Click the Measure button.
• When readings have stabilized, click the Accept button in the pop-up box.
-- Applying Offset --
• Click the Apply button to apply the calculated offset.
• The calculated offset will be transferred to the offset fi eld near the top of the
window.
• Click OK to save the values to the sensor!!!
-- Verifying Settings --
• Using the Real Time Monitor, take a few readings to verify it is reading as
expected.
IMPORTANT NOTE!
When taking readings on an absolute sensor, you will need to SUBRACT
the current barometric pressure to get elevation. See the Barometric
Compensation Utility Application Note (9C0275) for information on how the
Barometric Utility can help automate this process.
INW - PT2X Instruction Manual 25
Staff Gauge
When using the Staff Gauge setting, you may want to change the channel label at the
top of the Settings window to read “Staff Gauge”.
NOTE: Be sure to use the same units for all measurements on this page. For example,
if you have the program set to display in Ft H2O then be sure to enter the barometric
pressure and staff gauge readings in Ft H2O.
-- Computing Offset --
• If using an absolute sensor, enter the current barometric pressure in the
Barometric box.
• Place the sensor in the well.
• Note the current level on your staff gauge.
• Enter this value in the Staff box.
• Click the Measure button.
• When readings have stabilized, click the Accept button in the pop-up box.
-- Applying Offset --
• Click the Apply button to apply the calculated offset.
• The calculated offset will be transferred to the offset fi eld near the top of the
window.
• Click OK to save the values to the sensor!!!
-- Verifying Settings --
• Using the Real Time Monitor, take a few readings to verify it is reading as
expected.
IMPORTANT NOTE!
When taking readings on an absolute sensor, you will need to SUBRACT
the current barometric pressure to get a staff gauge reading. See the
Barometric Compensation Utility Application Note (9C0275) for information
on how the Barometric Utility can help automate this process.
26 INW - PT2X Instruction Manual
Appendix C: Alternate Connection Options
INW recommends connecting the sensor to your computer using the INW USB cable.
However, when using Aqua4Plus, the sensor can also be connected using an RS232
serial port or a USB-to-Serial cable, as described below. (Note: Aqua4Plus Lite can
only communicate using the INW USB cable.)
Connecting via RS232 Serial Port
In its cabled confi guration, the sensor cable is terminated with a weather-resistant
connector. In its cableless confi guration, the sensor
is terminated with a weatherresistant connector inside a screw-cap. Connect the weather-resistant connector to
your computer’s serial port as shown below.
Connect the sensor to your computer using an RS485/RS232 adapter
and an interface cable.
Connecting with a USB/Serial Adapter
USB-to-Serial cables are readily available from many electronics and computer stores,
as well as numerous sites on the Internet. INW has tested and recommends the Keyspan
USA-19HS. It is available from INW as well as from many sites on the Internet. Install
as follows:
• Plug into USB port.
• Install the drivers provided with the particular unit.
• Determine the port number to which the adapter is assigned.
Right-click on My Computer.
From the popup menu, select Manage to open the Computer Management
window.
On left panel, click on Device Manager.
On right panel, double-click on Ports.
A list of active COM ports will be displayed. Note the COM number
assigned to the adapter you just installed.
For example:
Close Manager.
• Connect to the sensor.
PC or
Laptop
Computer
RS485/RS232
Adapter
Interface Cable
Serial Port
Sensor
Screw-
Sensor
cap
Cableless
Confi guration
INW - PT2X Instruction Manual 27
• On the Aqua4Plus software, select the COM port noted above. (If you do not
see your new COM port in the dropdown box, open the Communications dialog
box from the Options menu. Increase the Highest COM port number, up to a
maximum of 15.)
Connect the sensor to your computer using a
USB to Serial adapter and an interface cable.
Interface
Cable
PC or Laptop
Computer
USB Port
USB-to-Serial
Adapter
RS232/RS485
Adapter
Sensor
Screw-
Sensor
cap
Cableless
Confi guration
28 INW - PT2X Instruction Manual
Appendix D: Reading the PT2X via Direct Read
While the PT2X comes with INW’s easy to use Aqua4Plus or Aqua4Plus Lite software,
you can also use standard Modbus® RTU or SDI-12 equipment to easily take readings,
so as to tie into your existing equipment or networks.
You may need to use Aqua4Plus/Aqua4Plus Lite to make a few settings prior to directly
reading the PT2X with your equipment. These might include the units for the returned
values and/or the Modbus baud rate. These are described in the following sections.
For Modbus direct read, you must have PT2X fi rmware 1.5 or higher. For SDI-12, you
must have fi rmware 2.0 or higher.
Setting Units for Direct Read
By default, the PT2X uses the following units:
Temperature Degrees Celsius
Pressure PSI
However, you can select from a variety of units for direct read measurements. If you
want to change to different units, for example, degrees Fahrenheit for temperature or
feet of water for pressure, set these units using Aqua4Plus/Aqua4Plus Lite.
• From Aqua4Plus select Direct Read Units from the Confi gure | Advanced menu.
• From Aqua4Plus Lite select Set Direct Read Units from the Sensor confi gure
menu.
• On the popup box, click the down-arrows next to the channel types you want to
change, and then select the units you want.
• Click OK.
Select the units for your direct read
measurements, whether Modbus or SDI-12.
Once set, these units are saved on the sensor and direct readings, either via Modbus or
via SDI-12, will return values using these units. (Note: These settings do not affect the
units used on the Aqua4Plus/Aqua4Plus Lite display. Refer to the software manual for
details.)
INW - PT2X Instruction Manual 29
Power Consideration
If your sensor does not have internal batteries and is not powered continuously by an
auxiliary power supply, then you must turn power on to the sensor at least two seconds
before a reading is to be taken to allow the sensor to warm up.
Reading Via Modbus
®
RTU
Setting Baud Rate
Your PT2X comes confi gured to communicate at 38,400 baud, with 8 data bits, one
stop bit, and no parity. The sensor can also be set to 19,200 or 9600 baud, if needed
for your application. You must use Aqua4Plus, not Aqua4Plus Lite, to make baud rate
changes.
If needed, set your PT2X to the desired baud rate as follows:
• Click on the Confi gure menu, and then select Advanced.
• From the fl yout menu, select Sensor Baud Rate. (You may be asked for a
password. Enter admin.)
• On the popup box, click the down-arrow, select the baud rate you need, and then
click OK.
Once you have changed the baud rate on the PT2X, you will not be able to talk to it
with Aqua4Plus until you change the baud rate for Aqua4Plus, as follows:
• Click the Options menu, and then select Baud Rate.
• On the popup box, click the down-arrow, select the baud rate you need, and then
click OK.
The current Aqua4Plus baud rate is displayed in the lower right corner of the main
Aqua4Plus window.
Taking Measurements
Reading Registers
Read measurements using Modbus function 03 – Read Holding Registers.
Readings are located in two registers each, starting at address 62592. (PT2X register
addressing is zero based, i.e., starts at zero. If your equipment uses one based
addressing, you will need to add one to the register addresses.)
30 INW - PT2X Instruction Manual
Register addresses for PT2X
Addresses for PT2Xs with fi rmware lower than 2.0
Zero Based One Based
Pressure 62592 62593
Temperature 62594 62595
Addresses for PT2Xs with fi rmware 2.0 or higher
Zero Based One Based
Temperature 62592 62593
Pressure 62594 62595
Measurement Timing
When you request a reading via Modbus, the sensor wakes up, returns the current
values in the registers, and then starts taking new readings and updating the registers.
After approximately 10 seconds, if no more readings have been requested, the sensor
goes back to sleep.
Because of this, the fi rst reading you get will be old. If you are taking readings at
intervals of less than 10 seconds, simply ignore the fi rst reading — all remaining
readings will be current. On the other hand, if you are taking readings at intervals of
greater than 10 seconds, take a reading, ignore it, wait one second, take another reading.
Record this second reading.
Data Format
The data is returned as 32-bit IEEE fl oating-point values, highword fi rst, also referred
to as big-endian or fl oat inverse.
For further information and detailed Modbus examples, see INW application note,
“Modbus Direct Read on AquiStar Smart Sensors” available from our web site at http://
www.inwusa.com/appnotes.htm.
INW - PT2X Instruction Manual 31
Reading Via SDI-12
Note: The default units setting for pressure is PSI. The default units setting for temperature is
Celsius. To change these, use the Direct Read Units in the Aqua4Plus/Aqua4Plus Lite Control
Software.
Addressing
Default SDI-12 Address: 0
SDI-12 Command Nomenclature
<a> = Sensor address
{crc} = SDI-12 compatible 3-character CRC
<cr> = ASCII carriage return character
<lf> = ASCII line feed character
highlighted values indicate variable data
SDI-12 Commands
//*** Sensor Identifi cation
<a>I! <a>13 INWUSA PT2X 213ssssssssss<cr><lf>
// note: 213 will change to refl ect current
// fi rmware revision
// ssssssssss = device serial #
//*** Acknowledge Active, Address Query
<a>! <a><cr><lf>
?! <a><cr><lf>
//*** Change Address
<a>A<b>! <b><cr><lf> // change address to <b>
//*** Request measurement
<a>M! <a>0022<cr><lf> // request all measurements
<a>D0! <a>+22.0512+12.0512<cr><lf> // read temperature
// pressure
<a>M1! <a>0021<cr><lf> // request temperature measurement only
<a>D0! <a>+22.0512<cr><lf> // read temperature
<a>M2! <a>0021<cr><lf> // request pressure measurement only
<a>D0! <a>12.0512<cr><lf> // read pressure
32 INW - PT2X Instruction Manual
//*** Request measurement with CRC
<a>MC! <a>0022<cr><lf> // request all measurements with CRC
<a>D0! <a>+22.0512+12.0512{crc}<cr><lf> // read temperature
// pressure
<a>MC1! <a>0021<cr><lf> // request temperature measurement only
// with CRC
<a>D0! <a>
+22.0512{crc}<cr><lf> // read temperature
<a>MC2! <a>0021<cr><lf> // request pressure measurement only
// with CRC
<a>D0! <a>12.0512{crc}<cr><lf> // read pressure
//*** Concurrent measurement
<a>C! <a>00202<cr><lf> // request all measurements
<a>D0! <a>+22.0512+12.0512<cr><lf> // read temperature
// pressure
<a>C1! <a>00201<cr><lf> // request temperature measurement only
<a>D0! <a>+22.0512<cr><lf> // read temperature
<a>C2! <a>00201<cr><lf> // request pressure measurement only
<a>D0! <a>12.0512<cr><lf> // read pressure
//*** Concurrent measurement with CRC
<a>CC! <a>00202<cr><lf> // request all measurements with CRC
<a>D0! <a>+22.0512+12.0512{crc}<cr><lf> // read temperature
// pressure
<a>CC1! <a>00201<cr><lf> // request temperature measurement only
// with CRC
<a>D0! <a>+22.0512{crc}<cr><lf> // read temperature
<a>CC2! <a>00201<cr><lf> // request pressure measurement only
// with CRC
<a>D0! <a>12.0512{crc}<cr><lf> // read pressure
For further information and SDI-12 examples, see INW application note, “PT2X SDI-12
Interface Specifi cation” available from our web site at
www.inwusa.com/pdfs/pt2x_sdi12_spec.pdf
INW - PT2X Instruction Manual 33
Appendix E: Battery Changing Details
Battery Type: Two 1.5V AA batteries.
Because changing the batteries involves opening the water-tight seal, this must be
done in a clean, dry environment to avoid contamination or moisture damage
to the circuitry.
Battery Information and Reset Window
PREVENT BATTERY LEAKAGE!
Under some circumstances the internal batteries can leak, causing damage
to the sensor. To prevent leakage, the following is recommended. (Does not
apply to lithium batteries.)
• Change the batteries at least every 18 months.
• If the sensor will not be deployed for 3 months or more, remove the
batteries.
IMPORTANT NOTE!
When changing batteries, it is important to reset the Battery Life Calculator.
If the battery life calculator is not reset, the remaining life information will
be incorrect. Access the Battery Life Calculator from the Confi gure Menu -
Battery Information and Reset. If you have put in new batteries, checkmark
the box “I have just put in fresh batteries.” Click Save and Close.
34 INW - PT2X Instruction Manual
Tips
• Never place a tool on the sensor body, it is very thin and will deform causing
leaks at o-ring seals and potentially crushing the circuit board!
• Always twist the sensor body off the top cap assembly rather than twisting the
top cap assembly off of the sensor body.
• For cabled sensors, always clamp the sensor on the swaged area when applicable,
the shoulder above it will allow you to press down without the worry of the
sensor slipping out of the clamping device.
• If the sensor body is slippery or you are unable to grip it hard enough to twist, try
a piece of rubber cabinet liner for additional friction.
Opening the Housing
There is a black, compressible square ring near the top of the sensor. This ring acts as
a spring to lock the cable in. This needs to be compressed in order to allow removal of
the top cap. Once this ring is compressed, a gentle counterclockwise twist is all that is
needed to remove the cable from the sensor body. Compressing the black square ring
does take force, twisting does not.
Cabled Sensor Cableless Sensor
Care must be taken to compress the black square ring before attempting to twist the
housing. Forceful twisting of the housing can permantently damage the sensor.
Swage Knurling Black square ring Knurling Black square ring
HousingTop cap Housing
Top cap
INW - PT2X Instruction Manual 35
Securing the sensor
In order to compress the black square ring, the sensor must be secured so that you can
apply downward pressure to compress the ring. This can be done by holding in your
hand, using a vise, or using pliers, as detailed below.
By Hand - cabled version only
1. Tightly grasp the top cap in one hand.
2. Brace your hand against something such as a table or the ground. (Do not allow
the cable to be pinched against the brace.)
Continue to Removing the Housing on the next page.
With Vise - recommended method
Cabled Sensor
1. If possible, use a set of soft jaws
as shown to prevent marring the
surfaces of the top cap assembly.
2. Place the sensor in a vise clamping
gently on the swaged area. You
do not need to clamp the vise very
hard.
Continue to Removing the Housing
on the next page.
Cableless Sensor
1. If possible, use a set of soft jaws
as shown to prevent marring the
surfaces of the top cap assembly.
2. Remove the cableless top cap.
3. Place the sensor in a vise clamping
gently on the knurled area. You
do not need to clamp the vise very
hard.
Continue to Removing the Housing
on the next page.
Cabled Sensor - gripping on swage
Cableless Sensor - gripping
on knurled area
36 INW - PT2X Instruction Manual
With Pliers or Vise Grips - good for fi eld use
Removing the Housing
1. With your free hand, grasp the sensor body. Press down to compress the square
ring. Twist gently. Once the body begins to twist, you can stop the compression
action.
2. Finish gently twisting until the sensor body is removed.
3. Carefully disconnect the wiring connector inside from the circuit board in the
top cap.
Cabled Sensor
1. Grasp the pliers on the swaged area
(do not grab the knurled diameter).
2. Find a hard edge and place the tips
or side of the jaws of the pliers onto
this edge as shown. This will allow
you to press down with your weight
to compress the square ring.
Continue to Removing the Housing
below.
Cableless Sensor
1. Leave the cableless cap on in order
to protect the pins inside.
2. Grasp the pliers on the knurled
area tightly being careful to avoid
grabbing the knurled cap.
3. Find a hard surface and place the
cableless cap down onto it. This will
allow you to press down with your
weight to compress the square ring.
Continue to Removing the Housing
below.
Cabled Sensor Cableless Sensor
INW - PT2X Instruction Manual 37
Replacing Batteries and Resealing Sensor
1. Gently pull wiring to one side in order to allow batteries to fall out. Shake
gently if needed.
2. Replace batteries with button (+) facing open end.
3. Reinstall wiring connector — it only goes in one way, so make sure not to
force it.
4. Hold the top cap assembly at 90
° to the housing opening as shown. Depress the
spring with your fi ngertip and tuck the wiring into the cutaway on the circuit
board with your thumb to protect it while being installed back into the housing.
5. Rotate the top cap assembly into the opening in the housing being very careful
not to nick or pinch any wires.
6. Gently press down until the assembly stops and then twist it into place. It will
click in and decompress the gasket when it is fully engaged.
Pull wires gently to the side to allow
battery removal.
Connector connected properly
Properly completed —
black ring uncompressed
Wires tucked into slot
and spring tucked into
housing.
Push top cap in before
twisting and locking.
38 INW - PT2X Instruction Manual
Reordering Information
For sales & service offi ces, please contact:
INW, A Division of Seametrics
www.inwusa.com
800-776-9355
INW - PT2X Instruction Manual 39
LIMITED WARRANTY/DISCLAIMER - AquiStar® PT2X
SUBMERSIBLE PRESSURE /TEMPERATURE SENSOR
A. Seller warrants that products manufactured by Seller when properly installed, used
and maintained with a properly installed desiccant tube, shall be free from defects in
material and workmanship. Seller’s obligation under this warranty shall be limited to
replacing or repairing the part or parts or, at Seller’s option, the products which prove
defective in material or workmanship within ONE (1) year from the date of delivery,
provided that Buyer gives Seller prompt notice of any defect or failure and satisfactory
proof thereof. Any defective part or parts must be returned to Seller’s factory or to
an authorized service center for inspection. Buyer will prepay all freight charges
to return any products to Seller’s factory, or any other repair facility designated by
Seller. Seller will deliver replacements for defective products to Buyer (ground freight
prepaid) to the destination provided in the original order. Products returned to Seller
for which Seller provides replacement under this warranty shall become the property of
Seller.
This limited warranty does not apply to lack of performance caused by abrasive materials,
corrosion due to aggressive fl uids, mishandling or misapplication. Seller’s obligations under
this warranty shall not apply to any product which (a) is normally consumed in operation, or (b)
has a normal life inherently shorter than the warranty period stated herein.
In the event that equipment is altered or repaired by the Buyer without prior written approval by
the Seller, all warranties are void. Equipment and accessories not manufactured by the Seller
are warranted only to the extent of and by the original manufacturer’s warranty.
THE FOREGOING WARRANTIES ARE IN LIEU OF ALL OTHER WARRANTIES,
WHETHER ORAL, WRITTEN, EXPRESSED, IMPLIED OR STATUTORY. IMPLIED
WARRANTIES OF FITNESS AND MERCHANTABILITY SHALL NOT APPLY. SELLER’S
WARRANTY OBLIGATIONS AND BUYER’S REMEDIES THEREUNDER (EXCEPT AS
TO TITLE) ARE SOLELY AND EXCLUSIVELY AS STATED HEREIN. IN NO CASE
WILL SELLER BE LIABLE FOR CONSEQUENTIAL DAMAGES, LABOR PERFORMED
IN CONNECTION WITH REMOVAL AND REPLACEMENT OF THE SENSOR
SYSTEM, LOSS OF PRODUCTION OR ANY OTHER LOSS INCURRED BECAUSE
OF INTERRUPTION OF SERVICE. A NEW WARRANTY PERIOD SHALL NOT BE
ESTABLISHED FOR REPAIRED OR REPLACED MATERIAL, PRODUCTS OR SUPPLIES.
SUCH ITEMS SHALL REMAIN UNDER WARRANTY ONLY FOR THE REMAINDER OF
THE WARRANTY PERIOD ON THE ORIGINAL MATERIALS, PRODUCTS OR SUPPLIES.
B. With respect to products purchased by consumers in the United States for personal use, the
implied warranties including but not limited to the warranties of merchantability and fi tness for a
particular purpose, are limited to twelve (12) months from the date of delivery.
Some states do not allow limitations on the duration of an implied warranty, so the above
limitation may not apply to you. Similarly, some states do not allow the exclusion or limitation
of consequential damages, so the above limitation or exclusion may not apply to you. This
limited warranty gives you specifi c legal rights; however, you may also have other rights which
may vary from state to state.
40 INW - PT2X Instruction Manual
Notes
19026 72nd Avenue South
Kent, WA 98032 USA
253.872.0284
FAX 253.872.0285 / info@inwusa.com
INW, A Division of Seametrics
Pressure/Temperature Smart Sensor and Datalogger
©
1997 - 2016 Seametrics. All rights reserved. Instrumentation Northwest and INW are trademarks of Seametrics.
Doc# 9B0730r20.1 1/6/2016 / PN 6D275-NI
For PSIG
sensors, refer
to page 12
regarding
desiccant
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