APG PT-500-P30 User manual

APG
R
Doc #9003999
Part #200245
Rev C, 07/19
PT-500 Modbus Series
User Manual

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Table of Contents
Introduction ................................................................................................................ iii
Warranty and Warranty Restrictions.................................................................... iv
Chapter 1: Specications and Options..................................................................... 1
Dimensions ........................................................................................................................................1
Specications ................................................................................................................................... 2
Model Number Congurator.......................................................................................................... 3
Electrical Pinout Table, Power Supply Table, and System Wiring Diagrams..................... 4
Chapter 2: Installation and Removal Procedures and Notes..............................5
Tools Needed..................................................................................................................................... 5
Mounting Instructions ................................................................................................................... 5
Electrical Installation ..................................................................................................................... 5
Removal Instructions ..................................................................................................................... 6
Chapter 3: Programming ............................................................................................6
Modbus Programming .................................................................................................................... 6
Modbus Programming with RST-6001 and APG Modbus Software ...................................... 6
PT-500 Modbus Register Lists .................................................................................................. 7-9
PT-500 Modbus Sensor Parameters - L5 pressure series...................................................... 10
PT-500 Modbus Sensor Parameters - L31 level series ........................................................... 10
PT-500 Modbus Application Parameters - L31 level series ............................................. 11-15
Chapter 4: Maintenance ...........................................................................................16
General Care.................................................................................................................................... 16
Vent Tube Drying......................................................................................................................16-17
Repair and Returns........................................................................................................................ 17
NOTE: Wiring information in this User Manual is specic to the Modbus Series of the
PT-500. If you have a 0-5V, mV/V, or 4-20 mA Series sensor, please consult the factory at
1-888-525-7300, or our website at www.apgsensors.com/support, for the appropriate
manual for your sensor.

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Introduction
Thank you for purchasing a PT-500 modbus series submersible pressure transmitter from APG. We
appreciate your business! Please take a few minutes to familiarize yourself with your PT-500 and this
manual.
PT-500 submersible pressure transmitters oer reliability in harsh industrial conditions. The small size,
integrated electronics, wide operating temperature range, and durability make the PT-500 the perfect
instrument for static and dynamic pressure measurement.
Reading your label
Every APG instrument comes with a label that includes the instrument’s model number, part number, serial
number, and a wiring pinout table. Please ensure that the part number and pinout table on your label
match your order.

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Warranty and Warranty Restrictions
This product is covered by APG’s warranty to be free from defects in material and workmanship under
normal use and service of the product for 24 months. For a full explanation of our Warranty, please visit
https://www.apgsensors.com/about-us/terms-conditions. Contact Technical Support to receive a Return
Material Authorization before shipping your product back.
Scan the QR code below to read the full explanation of our Warranty on your tablet or smartphone.

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Chapter 1: Specications and Options
• Dimensions
PT-500 with Reusable Cage
PT-500 with Removable Plastic
Nose Cone
PT-500 with Tri-clover
Sanitary Fitting
PT-500 with Welded Anti-snag Cage
1.00"
[25.4mm]
Ø.188" THRU
PROTECTIVE
NOSE CONE
7.25"
[184.2mm]
1.44"
[36.6mm]
4.93"
[125.2mm]
0.89"
[22.5mm]
1.00"
[25.4mm]
0.99"
[25.1mm]
1/2" NPTM
1/2" NPTM
REMOVABLE
SENSOR CAGE
ASSEMBLY
3.60"
[91.4mm]
1.67"
[42.4mm]
6.47"
[164.4mm]
0.89"
[22.5mm]
7.36"
[186.9mm]
0.99"
[25.1mm]
1/2" NPT
1.00"
[25.4mm]
NON-REMOVABLE
CAGE ASSEMBLY
1.65"
[41.9mm]
7.19"
[182.5mm]
3.60"
[91.4mm]
0.95"
[24.1mm]
1.00"
[25.4mm]
1/2" NPTM
6.30"
[160.0mm]
0.89"
[22.5mm]
1.98"
[50.3mm]
0.31"
[8.0mm]
5.08"
[129.0mm]
0.89"
[22.5mm]
0.99"
[25.1mm]
1.00"
[25.4mm]
1/2" NPTM
5.96"
[151.5mm]

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Performance
Pressure Ranges 0 to 250 PSI
Digital Output Modbus RTU, 4-wire RS-485
Over Pressure 2X FSO
Burst Pressure 3.0X FSO
1 Year Stability 0.75% FSO
Accuracy
Linearity, Hystereses & Repeatability ±0.25% of Full Scale (BFSL) up to ±0.1% of Full Scale
±1.0% for ≤ 1 psi
Thermal Zero Shift @ 70 °F ±0.045% FSO/°C (±0.025% FSO/°F)
Thermal Span Shift @ 70 °F ±0.045% FSO/°C (±0.025% FSO/°F)
Environmental
Operating Temperature -40 to 85°C / -40 to 185°F
Compensated Temperature
≤ 10 psi: 0º - 60ºC / 32º - 140ºF
> 10 psi: -10º - 70ºC / 14º - 158ºF
Maximum Submersible Depth 575 ft / 175.25 m / 250 psi
Electrical
Supply Voltage (at sensor) 5-28 VDC
Current Draw 2 mA max.
Protection Reverse Polarity and Surge (per IEC 61000-4-5)
Load Limitation R(max) = ((Vs-12V)/0.02A)-(0.042Ω per ft. of cable)
Startup Time 200 ms
Materials of Construction
Wetted Materials 316L Stainless Steel
Anti-snag Cage 316L Stainless Steel
Cable Urethane, PVC, or Hytrel
Protective Nose Cone Delrin
Seal Viton ETP-s
Mechanical
Pressure Connection See model number congurator for complete list
Cable Tensile Strength Up to 200 pounds
Patents
US Patent No. 7,787,330
• Specications

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• Model Number Congurator
Model Number: PT-500_____ - _____ - _____ - _____ - _____ - _____ - _____ - _____ - _____
A B C D E F G H I
A. Cable Type
□ -▲Urethane - Blue
□B Hytrel .31” Ø - Black
□C PVC - Black
□D Hytrel .25” Ø - Black
B. Pressure Range
□Specify range in desired unit of measure
__________ Max Water Depth
575 ft. (175.25 m), 250 psi
C. Standard Units of Measure
□PSI □FTH2O
□INH2O □MMH2O
D. Pressure Type (Venting) Range
□G Gauge (open vent tube) -- 0 - 250 psi
□A Absolute (sealed vent tube) -- 10 - 200 psi
□S Sealed (sealed vent tube) -- 4 - 20 psi
E. Output
□L1▲ 4-20 mA, 2-wire
□L3 0-5V, 4-wire*
□L9 10 mV/V, 4-wire*
□L12 1-5V, 4-wire*
□L21 1-10V, 4-wire*
□L5 Modbus RTU, 4-wire RS-485*†
Pressure reading only
□L31 Modbus RTU, 4-wire RS-485 *†
Level calculations, tank volume
Note: *Indicates this option does not yet have CSA
Approvals.
Note: †Indicates Field Adjustable Zero feature is not
included.
F. NPTM
□E0▲ 1/2” NPTM tting for conduit,with pigtail
□E5 Pigtail without conduit connection
G. Process Connection
□P1▲ 1/2” NPTM with removable plastic nose cone
□P5 1/4” NPTF
□P37 Welded Cage (anti-snag 1 piece tting)
□P38 1-1/2” tri-clover with 3/4” diaphragm
□P39 Reusable Cage (includes P38 tting)
H. Accuracy
Greater than 1 PSI
□N0▲ ±0.25%
□N1 ±0.25% with NIST certication
□N2 ±0.1% with NIST certication
1 PSI and Below
□N3 ±1%
□N4 ±1% with NIST certication
I. Cable Length
□(specify length of cable needed in feet)
Note: ▲Indicates this option is standard.

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• Electrical Pinout Table, Supply Power Table, and System Wiring Diagrams
Pigtail
Modbus
Red + Power
Black - Power
Green B (TX-)
White A (TX+)
Shield Case Gnd
Modbus
Power Supply 5-28 VDC
Power
Supply
+5-28 Vdc
GND Use Shielded Cable
120 Ω
terminating
resistor
120 Ω terminating
resistor at last sensor
V+
B (TX-)
A (TX+)
Sensor 1
GND
V+
B (TX-)
A (TX+)
Sensor 2
GND
V+
B (TX-)
A (TX+)
Sensor 3
GND
Master
Device
RS-485 A (TX+)
RS-485 B (TX-)
PT-500 modbus
series sensor
PT-500 modbus
series sensor
PT-500 modbus
series sensor
Note: PT-500 modbus sensors use
reversed TX+/TX- pins. When connecting
to your system, ensure continuity
of TX- to TX- and TX+ to TX+, rather than
A to A and B to B.
Power
Supply
+5-28 Vdc
GND Use Shielded Cable
Equivalent 120 Ω
terminating resistor
internal to RST-6001
120 Ω terminating
resistor at last sensor
USB to computer
with APG Modbus
software
RST-6001
Modbus
Controller
V+
B
A
Sensor 1
GND
V+
B
A
Sensor 2
GND
V+
B
A
Sensor 3
GND
A
B
-5V
PT-500 modbus
series sensor
+5V
PT-500 modbus
series sensor
PT-500 modbus
series sensor
Note: An independent +5-28 Vdc
power supply is required when using
an RST-6001 Modbus Controller. The
RST-6001 can only supply ±5 Vdc, not
the +5-28 Vdc required by the modbus
series PT-500.
Modbus System Wiring with RST-6001
Modbus System Wiring
PT-500 Modbus Series Pinout Table PT-500 Modbus Series Supply Power Table

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Chapter 2: Installation and Removal Procedures and Notes
• Mounting Instructions
Your PT-500 can be mounted in three ways: via NPT process connection, free-hanging suspension, or con-
duit mounted. Mounting your pressure transducer is easy if you follow a few simple steps:
• Never over-tighten the sensor. In all cases, tighten the sensor as little as possible to create an adequate
seal.
• Always use thread tape or sealant compound on tapered threads. Wrap thread tape in the opposite
direction of the threads so it does not unravel as you screw the sensor into place. Unraveling can cause
uneven distribution and seal failure.
• Always start screwing in your sensor by hand to avoid cross-threading. Thread failure can be a problem
if you damage threads by over-tightening them or by crossing threads.
• For suspension mounting the PT-500, drill a 3/16” hole into the 1/2” NPTF to 1/2” NPTF hex coupler
(P/N 511414) and secure it to the 1/2” NPTM coupler tting of the PT-500. Attach a .060” diameter 316L
SS cable of desired length to the hex coupler and secure the steel cable according to your application
requirements.
• Wrench sized appropriately for your PT-500’s process or conduit connection.
• Thread tape or sealant compound for threaded connections.
• Tools Needed
• Attach the wires of your PT-500 to your control system according to the pinout table above.
• Electrical Installation
IMPORTANT: APG modbus equipment uses reversed TX+/TX- pins. When making
connections between APG equipment, ensure continuity of A to A and B to B pins. When
connecting APG modbus equipment to other systems, ensure continuity of TX+ to TX+
and TX- to TX-.
NOTE: If your PT-500 has a vent tube, do not seal, cover, or close the vent tube with
anything other than an APG-provided venting cap or desiccant drying cartridge (See Fig-
ure 4.1 and 4.2). Unapproved seals or covers will prevent proper sensor operation.

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Removing your PT-500 from service must be done with care. It’s easy to create an unsafe situation, or
damage your sensor, if you are not careful to follow these guidelines:
• For sensors installed via NPT process connection, make sure the pressure is completely removed from
the line or vessel. Follow any and all procedures for safely isolating any media contained inside the line
or vessel.
• Remove the sensor with an appropriately sized wrench (per your process connection).
• For suspended sensors, retrieve the sensor from the vessel. Follow any and all procedures for safely
isolating any media contained inside the line or vessel.
• Carefully clean the sensor’s tting and diaphragm of any debris (see General Care) and inspect for
damage.
• Store your sensor in a dry place, at a temperature between -40° F and 180° F.
• Removal Instructions
DANGER: Removing your process connected PT-500 Pressure Transmitter while there
is still pressure in the line could result in injury or death.
PT-500 L5/L31 modbus series sensors use standard Modbus RTU protocol (RS-485). The sensors can only op-
erate as slave devices. Sensor default transmission settings are 9600 Baud, 8 Bits, 1 Stop Bit, No Parity, and
require a minimum delay of 300 ms between transactions to return the contents of all registers. Commands
returning fewer registers will require shorter delays. See PT-500 Modbus Register Lists on pages 7 - 9.
Chapter 3: Programming
• Modbus Programming
NOTE: For more information about Modbus RTU, please visit www.modbus.org.
IMPORTANT: Any contact with the diaphragm can permanently damage the sensor.
Use extreme caution.