Seametrics INW PT2X Instructions Manual
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INW PT2X
Pressure/Temperature Smart Sensor
and Data Logger Instructions
For PSIG
sensors, refer
to page 18
regarding
desiccant
use!
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PROUDLY
MADE
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ISO
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TABLE OF CONTENTS
General Information
General Information ........................................................................................................................................................................Page 3
Dimensions .........................................................................................................................................................................................Page 3
Specications .....................................................................................................................................................................................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
PT2X INSTRUCTIONS
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.
Seametrics • 253.872.0284 Page 2 inwusa.com
GENERAL INFORMATION
PT2X INSTRUCTIONS
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-touse 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 easyto-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.
Dimensions
Cableless
0.25” (0.6
cm) Shorter
0.28” (0.7 cm)
0.28” (0.7 cm)
12.18” (30.9 cm)
Battery Version
8.37” (21.3 cm)
Non-Battery Version
Diameter
0.75” (1.9 cm)
Seametrics • 253.872.0284 Page 3 inwusa.com
GENERAL INFORMATION
PT2X INSTRUCTIONS
Specications*
Housing & Cable Weight 0.8 lb. (0.4 kg)
Body Material Acetal & 316 stainless or titanium
Wire Seal
Material
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
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
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-dened, proled
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)
Resolution 0.1˚C 0.0034% FS (typical)
Units Celsius, Fahrenheit, Kelvin PSI, FtH₂O, inH₂O, mmH₂O, mH₂O, inH₂O, cmHg, mmHg, Bars, Bars,
Range -15˚ to 55˚C (5˚ to 131˚F) Gauge
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
Fluoropolymer and PTFE
below freezing.
environmental factors)
±2.0°C — below 0°C (32˚F)
±0.05% FSO (typical, static)
±0.1% FSO (maximum, static)
(B.F.S.L. 20˚C)
kPa
PSI: 12, 5, 15, 30, 50, 100, 300
FtH₂O: 2.32, 12, 35, 69, 115, 231, 692
Absolute³
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
*Specications 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.
Seametrics • 253.872.0284 Page 4 inwusa.com
GENERAL INFORMATION
PT2X INSTRUCTIONS
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 dened 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):
Water Line
P = Patm + kd
A
Patm
d
“A”
Pressure Diagram: See Detail A.
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 reects only the depth of submergence.
That is, the net pressure on the diaphragm is due entirely
to the depth of submergence.
Seametrics • 253.872.0284 Page 5 inwusa.com
Absolute pressure is given as Pa = Patm + kd
(where k is 2.307 feet of water)
GENERAL INFORMATION
PT2X INSTRUCTIONS
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
Do handle sensor with
care
Do store sensor in a
dry, inside area when
not in use
Do install a desiccant
tube if using a gauge
sensor
Do install sensor so the
connector end is kept
dry
Don’t drop into well
Lower gently to prevent
damage
Seametrics • 253.872.0284 Page 6 inwusa.com
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
INSTALLATION
PT2X INSTRUCTIONS
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 weatherresistant connector that is inside a screw-cap. Connect the
weather-resistant connector to your computer’s USB port
as shown below.
USB to RS485
Adapter
Screwcap
Sensor
Sensor
Cableless
Conguration
USB Port
PC or Laptop
Computer
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 Conguration 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.
Interface Cable
Screwcap
Sensor
Cableless
Conguration
Sensor
RS485/RS232
Adapter
Serial Port
PC or Laptop
Computer
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.)
USB Port
PC or Laptop
Computer
Screwcap
Sensor
Cableless
Conguration
Interface
Cable
USB-to-Serial
Adapter
RS232/RS485
Adapter
Sensor
Connecting sensor to your computer using
a USB to Serial adapter and an interface cable.
Seametrics • 253.872.0284 Page 7 inwusa.com
INSTALLATION
PT2X INSTRUCTIONS
Cable Wiring
If you buy your cabled sensor with a connector installed
(the normal conguration), 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.
White
Purple
Yellow
Brown
Blue
Shield
1
2
3
4
5
5-Pin
Connector
12 VDC+ (Vaux)
Modbus DModbus D+
Digital I/O (Not used)
12 VDC- (GND)
For Modbus® with rmware lower than 2.0
— with 5-pin connector
White
Purple
Yellow
Brown
Blue
Shield
1
2
3
4
5
5-Pin
Connector
12 VDC+ (Vaux)
Modbus DModbus D+
SDI-12 (Not used)
12 VDC- (GND)
For Modbus® with rmware 2.0 or higher
— with 5-pin connector
White
Purple
Yellow
Brown
Blue
Shield
1
2
3
4
5
5-Pin
Connector
12 VDC+ (Vaux)
Modbus D- (Not used)
Modbus D+ (Not used)
SDI-12 Signal
12 VDC- (GND)
For SDI-12 with rmware 2.0 or higher
— with 5-pin 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
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 Congure 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” 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.
Firmware Version Filtering
1.3 and above Can be set from 1 (no ltering) to 8 (maximum
ltering) from the Advanced option on the
Congure 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).
For SDI-12 with rmware 2.0 or higher
— without connector
Seametrics • 253.872.0284 Page 8 inwusa.com
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.
INSTALLATION
PT2X INSTRUCTIONS
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
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
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 weatherresistant 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.
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.
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
Seametrics • 253.872.0284 Page 9 inwusa.com
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