Seametrics INW User manual
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INW Panel Meter
Reading an INW PT12 Sensor
PANEL METER FOR INW PT12 SENSOR
Seametrics • 253.872.0284 Page 3 inwusa.com
Table of Contents
Introduction .....................................................................................................................................5
What is an INW Panel Meter for an INW PT12 Smart Sensor? ..............................................5
Initial Inspection and Handling ..........................................................................................................5
Do’s and Don’ts.........................................................................................................................................5
Setup....................................................................................................................................................6
Connecting the Meter............................................................................................................................6
Operation...........................................................................................................................................8
Meter Settings...........................................................................................................................................8
Appendix A - Display Units ...................................................................................................... 11
Appendix B - Meter Reset......................................................................................................... 13
Complete Meter Conguration....................................................................................................... 14
Seametrics Limited Warranty................................................................................................... 17
©1997 - 2016 Seametrics. All rights reserved. INW is a Division of Seametrics.
Registered trademarks and trademarks belong to their respective owners.
PANEL METER FOR INW PT12 SENSOR
Seametrics • 253.872.0284 Page 4 inwusa.com
PANEL METER FOR INW PT12 SENSOR
Seametrics • 253.872.0284 Page 5 inwusa.com
Introduction
What is an INW Panel Meter for an INW PT12 Smart Sensor?
This is a Modbus® meter that is specially congured to read an INW PT12 Pressure/
Temperature Smart Sensor.
By default, the meter displays pressure in PSI. The meter can also be set to display
pressure in feet of water or meters of water or to display temperature in degrees Celsius.
The meter is available in either an 85 - 265 VAC version for wired-in power or in a
12 VDC version for remote or portable usage.
The meter comes installed in a weatherproof Nema 4X enclosure with the PT12 Smart
Sensor connected through a wire seal.
An INW PT12 Smart Sensor is a submersible pressure/temperature sensor which
can communicate via Modbus, as well as SDI-12. When used with this meter, the
sensor communicates via Modbus.
Initial Inspection and Handling
Upon receipt of your meter, 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. If concealed damage is found, immediately le
a claim with the carrier.
Do’s and Don’ts
Do handle the device with care.
Don’t install the device so that the box or connector is submerged.
Don’t bang or drop the device on hard objects.
PANEL METER FOR INW PT12 SENSOR
Seametrics • 253.872.0284 Page 6 inwusa.com
Setup
Connecting the Meter
Connecting the Meter
Sensor Connection
The sensor is wired to the meter as shown in Figure 2. The meter supplies 12 VDC
power to the sensor through a dropping resistor and voltage regulating zener diode.
Direct wiring sensor
PANEL METER FOR INW PT12 SENSOR
Seametrics • 253.872.0284 Page 7 inwusa.com
Power Connection
INW does not supply a power connection. It is up to the client and their engineers to
wire the power connection.
Meter manufacturer power specications:
AC: 85 - 265 VAC, 50/60 Hz, 15 Watts
Recommended fuse: 1 A, 250V, slow-blow
Wire: Copper with 60° C or 60/75° C insulation
Observe all safety precautions. To ensure safety
and prevent damage to the meter, wiring should be
done by a qualied technician in accordance with all
local, state, and federal guidelines.
Bulkhead and Sensor Wiring
Bulkhead Wiring
Sensor Wiring
Caution!
Baud Rate
The panel meter is set to communicate at 19,200 baud. The normal baud rate for the
PT12 is also 19,200. The PT12 can communicate at 38,400, 19,200, or 9600 baud. The
panel meter can communicate at either 19,200 or 9600 baud, but not at 38,400. If your
PT12 has been set to a different baud rate, contact INW for information on how to
reset the baud rate.
PANEL METER FOR INW PT12 SENSOR
Seametrics • 253.872.0284 Page 8 inwusa.com
Operation
Your meter comes precongured to read your INW PT12 Pressure/Temperature sensor.
Once the meter is powered and the sensor is connected, the meter should immediately
begin displaying pressure readings.
Meter Settings
Though your meter comes precongured, there may be times when you want to change
some of the settings. The meter is controlled via four buttons on the front of the meter
face:
Figure 3: Meter control buttons
The most common settings are detailed below. For complete settings, see the Appendix.
Slave ID
The Slave ID is the sensor address assigned to your sensor. You can nd this address
on the calibration sheet that came with your sensor.
If you need to reset the address in the meter, do so as follows:
MENU RESET MAX ACK
To change a value on
the meter, use the to
select the digit you want
to change. Use the to
cycle through acceptable
values.
PANEL METER FOR INW PT12 SENSOR
Seametrics • 253.872.0284 Page 9 inwusa.com
Register Number
The meter reads a particular register (memory) address on the sensor in order to display
a reading. The PT12 has three registers - one for pressure, one for temperature, and
one for voltage. The meter comes precongured to read pressure. If you want to read
temperature, you must set the meter to read the correct register, as shown below. (Note,
if you are using other than PSI as display units for pressure, see the following section
on display units.)
Display Units
The panel meter comes precongured to display readings in the units you have
ordered for your PT12. The PT12 default is PSI for pressure and degrees Celsius for
temperature, unless something else is specied in your order.
If you need to change units, see Appendix A.
NOTE: With rmware version
0.13 and higher you can also
read from registers:
462593 for pressure
462595 for temperature
462597 for voltage
PANEL METER FOR INW PT12 SENSOR
Seametrics • 253.872.0284 Page 10 inwusa.com
Polling Interval
The polling interval controls how often the meter queries the sensor for a new value.
The meter comes precongured with a two second polling interval. You can change this
interval as follows:
Decimal Point Placement
The meter can display a maximum of six digits and comes precongured to display
three digits followed by three decimal places. For example, 154.925. You can change
the number of decimal places as follows:
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