Seametrics PT2X Instructions Manual
Precision Environmental Sensors
d
C
An ON
I
CON Brand
PT2X
Pressure/Temperature Smart Sensor
and Data Logger Instructions
For PSIG
sensors, refer
to page 23
regarding
desiccant
use!
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p
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PROUDLY
MADE
IN THE
USA
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ISO
9001:2008
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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
Connecting to Sensors ...................................................................................................................................................................Page 8
Cable Wiring ......................................................................................................................................................................................Page 9
Installing Aqua4Plus2.0 ..................................................................................................................................................................Page 9
Using the PT2X without Aqua4Plus 2.0 ...................................................................................................................................Page 9
Installing the Sensor ........................................................................................................................................................................Page 10
Desiccant Use .....................................................................................................................................................................................Page 10
Grounding Issues ..............................................................................................................................................................................Page 10
Settings and Calibration
Sensor Settings ..................................................................................................................................................................................Page 11
Program Settings ..............................................................................................................................................................................Page 11
Pressure Calibration.........................................................................................................................................................................Page 12
Depth to water ..................................................................................................................................................................................Page 13
Ground Elevation ..............................................................................................................................................................................Page 14
Sta Gauge .........................................................................................................................................................................................Page 14
Removing calibration setup values ............................................................................................................................................Page 14
Operation
Real-time Data ...................................................................................................................................................................................Page 15
Data Logging......................................................................................................................................................................................Page 16
Reports .................................................................................................................................................................................................Page 18
A Word About Units ........................................................................................................................................................................Page 18
Barometric Compensation ............................................................................................................................................................Page 19
Direct Read Modbus/SDI-12
Setting Units for Direct Read .......................................................................................................................................................Page 20
Power Consideration .......................................................................................................................................................................Page 20
Reading via Modbus RTU ..............................................................................................................................................................Page 20
Reading via SDI-12...........................................................................................................................................................................Page 21
Maintenance
Removing Debris from End Cone ...............................................................................................................................................Page 23
Desiccant Tubes ................................................................................................................................................................................Page 23
Sensor/Cable/End Connections ..................................................................................................................................................Page 24
Changing Batteries ...........................................................................................................................................................................Page 24
Troubleshooting
Problems/Probable Causes/Things to Try ...............................................................................................................................Page 27
Warranty
Seametrics Limited Warranty .......................................................................................................................................................Page 28
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 seametrics.com
GENERAL INFORMATION
PT2X INSTRUCTIONS
The Seametrics 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 Seametrics Smart Sensor family. IThe 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 Seametrics’ easy-to-use
Aqua4plus 2.0 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
Seametrics Smart Sensors, can be networked together and
controlled directly from a single computer.
While most will use the PT2X with our free, easy-to-use
Aqua4Plus 2.0 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 seametrics.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 2.0
Networking 32 available addresses per junction (Address range: 1 to 255)
File Formats .a4d and .csv
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, 7, 15, 30, 50, 100, 300
FtH₂O: 2.32, 12, 35, 69, 115, 231, 692
Absolute³
mH₂O: 0.72, 3.5, 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 (seametrics.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 seametrics.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 dierence 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
dierential (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)
Seametrics’ 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 seametrics.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 seametrics.com
Don’t scrape cable
over edge of well
May nick or fray the
cable
Don’t bend cable sharply
May close o 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 Seametrics 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
Seametrics’ USB to RS485 adapter.
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. Seametrics has tested and recommends
the Keyspan USA-19HS. Install as follows:
• Plug into USB port.
• Install the drivers provided with the particular unit.
• Once drivers are installed connect to sensor
Aqua4Plus 2.0 communicates 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.
Alternate Connection Options
Seametrics recommends connecting the sensor to your
computer using the Seametrics USB cable. However, when
using Aqua4Plus 2.0, the sensor can also be connected
using an RS232 serial port or a USB-to-Serial cable, as
described below.
Interface
Screwcap
Sensor
Cableless
Conguration
Cable
Adapter
RS232/RS485
Adapter
Sensor
Connecting sensor to your computer using
a USB to Serial adapter and an interface cable.
USB PortUSB-to-Serial
PC or Laptop
Computer
Seametrics • 253.872.0284 Page 7 seametrics.com
INSTALLATION
PT2X INSTRUCTIONS
Connecting to Sensors
Aqua4Plus 2.0 is designed to automatically detect your communication cable and scan for sensors. It is recommended
you connect your USB/RS485 cable to your PC and have the sensor connected before opening Aqua4Plus 2.0.
If your cable and sensor were not connected before opening Aqua4Plus 2.0 simply connect and click Rescan. While
scanning is active you’ll see a green dot ash in the upper right corner of the program. Scanning is complete when this
dot stops ashing.
If your sensor still won’t connect you can expand the Modbus address range under program settings here:
Simply drag the Address Range slider higher up to increase the maximum Modbus address scanned. If you’ve scanned
all the way up through address 255 and still have no connection click Troubleshooting for further troubleshooting or
contact Seametrics Tech Support for assistance.
Click at any time to refresh sensor information.
Seametrics • 253.872.0284 Page 8 seametrics.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
Installing Aqua4Plus 2.0
The PT2X comes with the Aqua4Plus 2.0 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 2.0.
Using the PT2X Without Aqua4Plus 2.0
Most users will use the PT2X with Seametrics’ Aqua4Plus
2.0 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 20.
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
For SDI-12 with rmware 2.0 or higher
— without connector
Seametrics • 253.872.0284 Page 9 seametrics.com
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