Seametrics INW PT2X User manual

PROUDLY
MADE
IN THE
USA
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ISO
9001:2008
INW PT2X
Pressure/Temperature Smart Sensor
and Data Logger Instructions
For PSIG
sensors, refer
to page 18
regarding
desiccant
use!

PT2X INSTRUCTIONS
Seametrics • 253.872.0284 Page 2 inwusa.com
General Information
General Information ........................................................................................................................................................................Page 3
Dimensions .........................................................................................................................................................................................Page 3
Specications .....................................................................................................................................................................................Page 4
How Pressure Sensors Work ........................................................................................................................................................Page 5
Initial Inspection and Handling...................................................................................................................................................Page 6
Do’s and Don’ts .................................................................................................................................................................................Page 6
Installation
Connecting External Power...........................................................................................................................................................Page 7
Connecting a PT2X to a Computer............................................................................................................................................Page 7
Cable Wiring.......................................................................................................................................................................................Page 8
Installing Aqua4Plus or Aqua4Plus Lite Software................................................................................................................Page 8
Using Without Aqua4Plus or Aqua4Plus Lite Software.....................................................................................................Page 8
Battery Life Calculator ....................................................................................................................................................................Page 9
Installing the Sensor........................................................................................................................................................................Page 9
Desiccant Use.....................................................................................................................................................................................Page 9
Grounding Issues..............................................................................................................................................................................Page 9
Settings and Calibration
Preparation..........................................................................................................................................................................................Page 10
Submergence.....................................................................................................................................................................................Page 11
Depth-to-Water.................................................................................................................................................................................Page 11
Elevation Above Sea Level ............................................................................................................................................................Page 12
Staff Gauge .........................................................................................................................................................................................Page 12
Operation
Collecting Data with Aqua4Plus and Aqua4Plus Lite .........................................................................................................Page 13
Real Time Monitor............................................................................................................................................................................Page 13
Setting up Data Recording ...........................................................................................................................................................Page 13
Retrieving Data..................................................................................................................................................................................Page 13
Viewing Data......................................................................................................................................................................................Page 13
Exporting Data...................................................................................................................................................................................Page 14
A Word about Units.........................................................................................................................................................................Page 14
Direct Read Modbus/SDI-12
Setting Units for Direct Read .......................................................................................................................................................Page 14
Power Consideration.......................................................................................................................................................................Page 15
Reading via Modbus RTU..............................................................................................................................................................Page 15
Reading via SDI-12...........................................................................................................................................................................Page 16
Maintenance
Removing Debris from End Cone...............................................................................................................................................Page 18
Desiccant Tubes.................................................................................................................................................................................Page 18
Sensor/Cable/End Connections..................................................................................................................................................Page 19
Changing Batteries...........................................................................................................................................................................Page 19
Appendix: DTW Reference
Entering Depth-to-Water Reference after Data Collection..............................................................................................Page 23
Troubleshooting
Problems/Probable Causes/Things to Try...............................................................................................................................Page 26
Warranty
Seametrics Limited Warranty.......................................................................................................................................................Page 27
TABLE OF CONTENTS
IF USING ALKALINE BATTERIES—PREVENT BATTERY LEAKAGE!
PT2X sensors are typically shipped with lithium batteries. If, however, you are
using alkaline batteries, be aware that under some circumstances alkaline
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.

PT2X INSTRUCTIONS
Seametrics • 253.872.0284 Page 3 inwusa.com
GENERAL INFORMATION
The INW PT2X Smart Sensor is an integrated data
logger 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 Smart Sensor family. Its compatibility with
INW’s Wireless Data Collection technology makes it ideal
for remote monitoring.
The PT2X is a microprocessor based digital intelligent sensor
designed to measure and record pressure, temperature,
and time, using 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.
This industry standard digital RS485 interface device records
up to 520,000 records of pressure/level, temperature, and
time data, operates with low power, and features easy-to-
use software with powerful features. Constructed with 316
stainless steel or titanium, PTFE, and uoropolymer, this
sensor provides high-accuracy readings in rugged and
corrosive eld conditions.
Two internal 1.5V 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.
Several PT2Xs, or a combination of PT2Xs and other INW
Smart Sensors, can be networked together and controlled
from one location, either directly from a single computer
or via INW’s Wireless Data Collection System.
While most will use the PT2X with our free, easy-to-use
Aqua4Plus Lite or Aqua4Plus software, it is by no means
limited to that software. You can use your own Modbus®
RTU or SDI-12 software or logging equipment to read
measurements, thus tying into your existing systems and
databases.
12.18” (30.9 cm)
8.37” (21.3 cm)
Diameter
0.75” (1.9 cm)
0.28” (0.7 cm)
0.28” (0.7 cm)
Cableless
0.25” (0.6
cm) Shorter
Battery Version
Non-Battery Version
Dimensions

PT2X INSTRUCTIONS
Seametrics • 253.872.0284 Page 4 inwusa.com
*Specications subject to change. Please consult out web site for the most current data (inwusa.com).
Modbus is a registered trademark of Schneider Electric.
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.
Housing & Cable Weight 0.8 lb. (0.4 kg)
Body Material Acetal & 316 stainless or titanium
Wire Seal
Material Fluoropolymer and PTFE
Cable Submersible: polyurethane, polyethylene, or ETFE (4 lb./100 ft., 1.8 kg/30 m)
Desiccant 1-3 mm indicating silica gel
Field Connector Standard
Temperature Operating Range Recommended: -15˚ to 55˚C (5˚ to 131˚F) Requires freeze protection kit if using pressure option in water
below freezing.
Storage Range Without batteries: -40˚ to 80˚C (-40˚ to 176˚F)
Power Internal Battery Two lithium ‘AA’ batteries - Expected battery life: 18 months at 15 min. polling interval (may vary do to
environmental factors)
Auxiliary 12 Vdc - Nominal, 6-16 Vdc - range
Communication Modbus® RS485 Modbus® RTU, output=32bit IEEE oating point
SDI-12 SDI-12 (ver. 1.3) - ASCII
Logging Memory 4MB - 520,000 records
Logging Types Variable, user-dened, proled
Logging Rates 8x/sec maximum, no minimum
Baud Rates 9600, 19200, 38400
Software Complimentary Aqua4Plus and Aqua4Plus Lite
Networking 32 available addresses per junction (Address range: 1 to 255)
File Formats .a4d and .csv (also .xls in Windows 8 and earlier)
Output Channels Temperature Depth/Level¹
Element Digital IC on board Silicon strain gauge transducer, 316 stainless or Hastelloy
Accuracy ±0.5°C — 0° to 55°C (32˚ to 131˚F)
±2.0°C — below 0°C (32˚F) ±0.05% FSO (typical, static) ±0.1% FSO (maximum, static)
(B.F.S.L. 20˚C)
Resolution 0.1˚C 0.0034% FS (typical)
Units Celsius, Fahrenheit, Kelvin PSI, FtH₂O, inH₂O, mmH₂O, mH₂O, inH₂O, cmHg, mmHg, Bars, Bars,
kPa
Range -15˚ to 55˚C (5˚ to 131˚F) Gauge
Absolute³
PSI: 12, 5, 15, 30, 50, 100, 300
FtH₂O: 2.32, 12, 35, 69, 115, 231, 692
mH₂O: 0.72, 3.5, 10.5, 21, 35, 70, 210
PSI: 30, 50, 100, 300
FtH₂O: 35, 81, 196, 658
mH₂O: 10, 24, 59, 200
Compensated --- 0˚ to 40˚C (32˚ to 104˚F)
Max operating pressure 1.1 x full scale
Over pressure protection 3x full scale up to 300psi - for > 300psi (650 ft or 200 m) contact factory
Burst pressure 1000 psi (approx. 2000 ft or 600 m)
Environmental IP68, NEMA 6P
Specications*
GENERAL INFORMATION

PT2X INSTRUCTIONS
Seametrics • 253.872.0284 Page 5 inwusa.com
GENERAL INFORMATION
How Pressure Sensors Work
Liquids and gasses do not retain a xed shape. Both
have the ability to ow and are often referred to as
uids. One fundamental law for a uid is that the 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 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 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 de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 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)
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 re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)
d
Water Line
Patm
A
P = Patm + kd
“A”

PT2X INSTRUCTIONS
Seametrics • 253.872.0284 Page 6 inwusa.com
GENERAL INFORMATION
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 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.
Do’s and Don’ts
Don’t drop into well
Lower gently to prevent
damage
Don’t scrape cable
over edge of well
May nick or fray the
cable
Don’t bend cable sharply
May close off vent tube
and/or weaken internal
wires
Don’t support sensor
with the connector
Use a strain relief device
Do handle sensor with
care
Do store sensor in a
dry, inside area when
not in use
 
 
Do install sensor so the
connector end is kept
dry
 
 
Do install a desiccant
tube if using a gauge
sensor

PT2X INSTRUCTIONS
Seametrics • 253.872.0284 Page 7 inwusa.com
Connecting 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. 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.
• 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.)
Connecting sensor to your computer using
a USB to Serial adapter and an interface cable.
PC or Laptop
Computer
RS485/RS232
Adapter
Interface Cable
Serial Port
Sensor
Screw-
Sensor
cap
Cableless
Conguration
Interface
Cable
PC or Laptop
Computer
USB Port
USB-to-Serial
Adapter
RS232/RS485
Adapter
Sensor
Screw-
Sensor
cap
Cableless
Conguration
INSTALLATION
Connecting External Power
The PT2X comes with two 1.5V AA internal batteries.
If auxiliary power is desired, you can use a 6–16 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
Cabled sensors are terminated with a weather-resistant
connector. Cableless sensors are terminated with a weather-
resistant connector that is inside a screw-cap. Connect the
weather-resistant connector to your computer’s USB port
as shown below.
Connecting sensor to your computer using
INW’s USB to RS485 adapter.
Aqua4Plus and Aqua4Plus Lite communicate with the
sensor using the USB to RS485 adapter cable. This cable
requires drivers to be installed on your computer. If you
are connected to the Internet when you rst plug in the
cable, it will normally obtain and install the correct drivers
automatically. If this does not happen, or if you do not have
Internet connection, you can use Aqua4Plus or Aqua4Plus
Lite to install the drivers. In Aqua4Plus, select Install USB/
RS485 Drivers from the Utilities menu; in Aqua4Plus Lite,
select the same from the Program Conguration menu.
Select your operating system, and then click Install.
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
Connect the weather-resistant connector to your
computer’s serial port as shown below.
PC or Laptop
Computer
USB Port
USB to RS485
Adapter
Sensor
Cableless
Conguration
Screw-
Sensor
cap

PT2X INSTRUCTIONS
Seametrics • 253.872.0284 Page 8 inwusa.com
INSTALLATION
Cable Wiring
If you buy your cabled sensor with a connector installed
(the normal conguration), no further wiring is needed.
For reference purposes, the rst three diagrams below
show the pinout from the connector for various scenarios.
The nal diagram shows the pinout if you bought your
sensor without a connector for use with SDI-12.
For Modbus® with rmware lower than 2.0
— with 5-pin connector
For Modbus® with rmware 2.0 or higher
— with 5-pin connector
For SDI-12 with rmware 2.0 or higher
— with 5-pin connector
For SDI-12 with rmware 2.0 or higher
— without connector
White
Purple
Yellow
Brown
Blue
Shield
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 D-
Modbus D+
SDI-12 (Not used)
12 VDC- (GND)
1
2
3
4
5
5-Pin
Connector
White
Purple
Yellow
Brown
Blue
Shield
12 VDC+ (Vaux)
Modbus D-
Modbus D+
Digital I/O (Not used)
12 VDC- (GND)
1
2
3
4
5
5-Pin
Connector
Installing 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 les for use with spreadsheets or databases.
Refer to the software manuals for details on installing and
using Aqua4Plus or Aqua4Plus Lite.
Setting the 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 Congure Menu |
Sensor Continuous Rate.
To use the continuous rate during recording, enter a “c” or
a zero in the Polling Interval on the Logging Schedule.
Setting the Filter
The PT2X has the ability to apply ltering to incoming data
in order to smooth out minor variations in readings. This
lter can be from 1 (no ltering) to 8 (maximum ltering.)
Different versions of rmware have different ltering
options as shown below. For further information on PT2X
data ltering, see INW application note Filter Response on
PT2X Smart Sensor.
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 Modbus®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 page 14.
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
Firmware Version Filtering
1.3 and above Can be set from 1 (no ltering) to 8 (maximum
ltering) from the Advanced option on the
Congure Menu — defaults to 1. (Cannot be
reset from Aqua4Plus Lite.)
1.0 - 1.2 Filter is set to 1 (no ltering). Adjustable ltering
can be obtained by upgrading to a higher
rmware version.
0.24 Filter is permanently set to 1 (no ltering).
0.23 and lower Filtering is permanently set to 8 (maximum).

PT2X INSTRUCTIONS
Seametrics • 253.872.0284 Page 9 inwusa.com
INSTALLATION
Battery Life Calculator
IMPORTANT NOTE for PT2X sensors with rmware 2.13 or
higher!
PT2Xs with rmware version 2.13 and higher have a battery
life calculator that is set at the factory when batteries are
rst put in the sensor. If the battery life calculator is not
reset, the remaining life information will be incorrect.
If you need to replace the batteries, see the Maintenance
section in this manual for replacement information and for
information on resetting the battery life calculator.
Installing the Sensor
ThePT2X measurespressure. Themost commonapplication
is measuring liquid levels in wells and tanks. In order to do
this, the sensor must be installed below the water level at a
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.
Note: If you are using an absolute sensor and
you want to enter a depth-to-water reference
after data is collected, then see Appendix
before proceeding.
• Lower the sensor to the desired depth.
• Fasten the cable to the well head using 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 ood or lie in water.
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 uid environment other than
water, be sure to check the compatibility of the uid with
the wetted parts of the sensor.
Desiccant Use
On vented sensors a 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 lled with blue silica gel beads. A
locking barb and a hydrophobic water lter are attached to
the end of the desiccant tube. This lter prolongs the life of
the desiccant as much as three times over a desiccant tube
without the lter.
Install the sensor so that the desiccant tube and cable
connector will not ood or lie in water.
The desiccant is a bright blue color when active and dry. See
Maintenance section for care and changing of desiccant.
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 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 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. Seametrics recommends
connecting the shield to ground at the connector end.

PT2X INSTRUCTIONS
Seametrics • 253.872.0284 Page 10 inwusa.com
To adjust sensor offsets, calibration, depth-to-water,
elevation, and other various settings, select the Settings
and Calibration option on the Congure Menu (Aqua4Plus)
or click the Settings button (Aqua4Plus Lite). In the Settings
and Calibration window, click on the channel you want to
adjust. Specic instructions for each channel are displayed
in the right panel. 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 speci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:
• Select the units you want to use for
measurements, i.e., psi, feet of water, inches of
mercury, etc. Set this from the Congure Menu |
Program Conguration | Set Computer Display
Units.
• Open the Settings and Calibration window by
clicking on the Settings button.
• From Aqua4Plus:
• 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.
• Open the Settings and Calibration window from
the Congure Menu | Settings and Calibration.
Step-by-step instructions will be displayed on the right
side of the window.
SETTINGS AND CALIBRATION
Sample Setting and Calibration Window
The basic setting/calibration process for pressure channels
is as follows. See following pages for detailed instructions.
1. Select the Pressure channel.
2. Enter a Channel Label, if desired.
3. Select the desired type of setting. A picture will
display illustrating the type of selection. Available
types:
• Depth/Submergence
• Depth-to-Water
• Elevation
• Staff Gauge
4. Supply any requested information.
5. Within the Calculator, supply any requested
information.
6. Click the Measure button to get a current
measurement from the sensor.
7. Click the Apply button to accept the new slope and
offset.
8. Click the OK button, to save your changes to the
sensor.

PT2X INSTRUCTIONS
Seametrics • 253.872.0284 Page 11 inwusa.com
Submergence
One-Point Calibration:
-- Computing Offset --
• Place sensor in the uid you are measuring at a precise
known level.
• In the Ref box for the rst point, enter this level or
pressure.
• Click 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 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 uid you are measuring at a precise
known level.
• In the Ref box for the rst point, enter this level or
pressure.
• Click rst Measure button.
• When readings have stabilized, click the Accept button in
the pop-up box.
-- Compute Second Calibration Point --
• Place sensor in the 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
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 (LT-14304) for information on how the
Barometric Utility can help automate this process.
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: If you have a cableless sensor or want to enter a
depth-to-water reference after data collection for an
absolute cabled sensor, see Appendix.
Cabled Sensors Only
Important! 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 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-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
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 get depth-to-water. See the
Barometric Compensation Utility Application
Note (LT-14304) for information on how the
Barometric Utility can help automate this
process.
SETTINGS AND CALIBRATION

PT2X INSTRUCTIONS
Seametrics • 253.872.0284 Page 12 inwusa.com
SETTINGS AND CALIBRATION
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”.
Important! Be sure to use the same units for all
measurements on this screen. 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-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 Offset --
• Click the Apply button to apply the calculated offset.
• The calculated offset will be transferred to the offset 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 (LT-14304) for information on how the
Barometric Utility can help automate this process.
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”.
Important! Be sure to use the same units for all
measurements on this screen. 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 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 (LT-14304) for information on how the
Barometric Utility can help automate this process.

PT2X INSTRUCTIONS
Seametrics • 253.872.0284 Page 13 inwusa.com
OPERATION
Collecting Data with Aqua4Plus & Aqua4Plus Lite
Following is a brief overview on using Aqua4Plus/
Aqua4Plus Lite to collect data. Please refer to the software
instruction manuals for further details on con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 rmware versions lower
than 2.0, the pressure is displayed in the rst column and
temperature in the second. On sensors with rmware
versions 2.0 and higher, the temperature is displayed in the
rst column and pressure in the second.
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.
Retrieving Data from the Sensor/Datalogger
• Click on the le you want to retrieve.
• Click the tool button.
• Select a le location.
• Click Save.
• Click Start.
Select the
data 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 le, then click the Open
button.
The File Display
window displays
your data in a
tabular format.
The Graph
window displays
your data on an
X Y coordinate
graph.

PT2X INSTRUCTIONS
Seametrics • 253.872.0284 Page 14 inwusa.com
OPERATION/DIRECT READ MODBUS/SDI-12
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 le location and enter a name for the le.
• Select a le type.
• Click Save.
* When using Windows 10, les can only be exported in .csv format. They
can then be opened manually from Excel or any other spreadsheet or
database program
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 Congure Menu | Program Conguration
| Set Computer Display Units.
DIRECT READ (MODBUS®OR SDI-12)
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 rmware 1.5
or higher. For SDI-12, you must have rmware 2.0 or higher.
Setting Units for Direct Read
By default, the PT2X uses the following units:
Temperature Degrees Celsius
Pressure PSI
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
Congure | Advanced menu.
• From Aqua4Plus Lite select Set Direct Read Units
from the Sensor con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.)

PT2X INSTRUCTIONS
Seametrics • 253.872.0284 Page 15 inwusa.com
DIRECT READ MODBUS/SDI-12
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 con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 Congure menu, and then select
Advanced.
• From the 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.)
Addresses for PT2Xs with rmware lower than 2.0
Zero based One based
Pressure 62592 62593
Temperature 62594 62595
Addresses for PT2Xs with 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 rst reading you get will be old. If you
are taking readings at intervals of less than 10 seconds,
simply ignore the 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 oating-point values,
highword rst, also referred to as big-endian or oat
inverse.
For further information and detailed Modbus examples,
see INW application note, “Reading INW Smart Sensors
Using Modbus RTU” available from our web site at inwusa.
com.

PT2X INSTRUCTIONS
Seametrics • 253.872.0284 Page 16 inwusa.com
OPERATION
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 Identication
<a>I! <a>13 INWUSA PT2X 213ssssssssss<cr><lf> Note: 213 will change to reect current rmware version.
ssssssssss = device serial number
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 and 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
All SDI-12 requests consist
of a command followed by
a request for values. Some
software or equipment may
combine these, making the
second one unnecessary. Refer
to your software or equipment
documentation for details.
<a>D0! <a>+7.15863<cr><lf>
Request Response
Address
Request for
Address
Returned
value(s)
Carriage Return
Linefeed
values read
<a>M1! <a>0021<cr><lf>
Request Response
Address
Command
Address
Time until
response
Carriage Return
Linefeed
# of values to
be returned
(in seconds)

PT2X INSTRUCTIONS
Seametrics • 253.872.0284 Page 17 inwusa.com
OPERATION
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 and 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>0022<cr><lf> Request all measurements
<a>D0! <a>+22.0512+12.0512<cr><lf> Read temperature and pressure
<a>C1! <a>0021<cr><lf> Request temperature measurement only
<a>D0! <a>+22.0512<cr><lf> Read temperature
<a>C2! <a>0021<cr><lf> Request pressure measurement only
<a>D0! <a>12.0512<cr><lf> Read pressure
Concurrent Measurement with CRC
<a>CC! <a>0022<cr><lf> Request all measurements with CRC
<a>D0! <a>+22.0512+12.0512{crc}<cr><lf> Read temperature and pressure
<a>CC1! <a>0021<cr><lf> Request temperature measurement only with CRC
<a>D0! <a>+22.0512{crc} <cr><lf> Read temperature
<a>CC2! <a>0021<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 Specication” available
from our web site at inwusa.com.

PT2X INSTRUCTIONS
Seametrics • 253.872.0284 Page 18 inwusa.com
MAINTENANCE
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. Do not 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 carefully remove debris
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. Do not 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.
Pressure element
Water inlet
End cone
Pressure element
Water inlet
End cone
Set screw
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 lled with blue silica gel beads. A
locking barb and a hydrophobic water lter are attached to
the end of the desiccant tube. This lter prolongs the life of
the desiccant as much as three times over a desiccant tube
without the lter.
Install the sensor so that the desiccant tube and cable
connector will not 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
lters can be purchased from Seametrics.
To Change the Desiccant:
• Pulling gently remove the black tube 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 rell with
new desiccant beads – tapping desiccant tube
frequently during relling to ensure that the beads
are fully seated in tube.
• Push the foam plug back into the tube.
• Reinsert the black tting.

PT2X INSTRUCTIONS
Seametrics • 253.872.0284 Page 19 inwusa.com
MAINTENANCE
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 noti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.
Battery Type: Two 1.5V AA batteries—Lithium or Alkaline
(lithium recommended)
IMPORTANT!
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.
IF USING ALKALINE BATTERIES
—PREVENT BATTERY LEAKAGE!
PT2X sensors are typically shipped with
lithium batteries. If, however, you are using
alkaline batteries, be aware that under some
circumstances alkaline 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.
Battery Life Calculator (Firmware 2.13 or higher)
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 Con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.
Be sure to reset the Battery Life Calculator
when changing batteries!
Changing Batteries

PT2X INSTRUCTIONS
Seametrics • 253.872.0284 Page 20 inwusa.com
MAINTENANCE
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.
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 permanently damage the sensor.
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 follows.
Swage Knurling Black square ring
HousingTop cap
Knurling Black square ring
Housing
Top cap
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.
Cabled Sensor—gripping on swage
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.
Cableless Sensor—gripping on knurled area