PT-500E Series Submersible Level Transmitters
“
Product Information: PT-500E Series Submersible Level
Transmitters for Potable Water
Specifications:
- Dimensions: 0.99″ [25.1mm] x 1.00″ [25.4mm] x 4.93″
[125.2mm] - Electrical Pinout: Modbus Red, Black, Green, White
- Supply Power: 9-28 VDC
Product Usage Instructions:
Chapter 1: Dimensions and Wiring
Dimensions: The product has specific dimensions
listed above.
Electrical Pinout Table: Follow the wiring
diagram provided for proper installation.
Chapter 2: Installation and Removal Procedures and Notes
Tools Needed: Ensure you have the necessary
tools for installation.
Mounting Instructions: Mount the transmitter as
instructed in the manual.
Electrical Installation: Connect the
transmitter following the system wiring diagram.
Removal Instructions: Use caution to avoid
damaging the sensor during removal.
Chapter 3: Programming (Modbus RTU Output Only)
Modbus Programming: Refer to the manual for
programming instructions or visit www.modbus.org for more
information.
Chapter 4: Maintenance
General Care: Regularly maintain and inspect
the transmitter for optimal performance.
Vent Tube Drying: Follow instructions provided
for vent tube maintenance.
FAQ:
Q: How long is the warranty?
A: The product is covered by a 24-month warranty against defects
in material and workmanship.
Q: What power supply is required?
A: The product requires a power supply of 9-28 VDC.
Q: Where can I find more information on programming?
A: For Modbus programming details, refer to the user manual or
visit www.modbus.org.
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PT-500E Series
Submersible Level Transmitters For Potable Water
User Manual
Doc # 9006878 Part # 201172 Rev A, 03/2025
CONTENTS
INTRODUCTION
III
WARRANTY AND WARRANTY RESTRICTIONS
IV
Repair and Returns
IV
CHAPTER 1: DIMENSIONS AND WIRING
1
Dimensions
1
Electrical Pinout Table, Supply Power Table, and System Wiring Diagrams
1
CHAPTER 2: INSTALLATION AND REMOVAL PROCEDURES AND NOTES
3
Tools Needed
3
Mounting Instructions
3
Electrical Installation
3
Removal Instructions
4
CHAPTER 3: PROGRAMMING (MODBUS RTU OUTPUT ONLY)
4
Modbus Programming
4
Modbus Programming with RST6001 and APG Modbus Software
5
PT500E Modbus Register Lists
5
PT500E Modbus Sensor Parameters L5 pressure series
8
PT500E Modbus Sensor Parameters L31 level series
8
PT500E Modbus Application Parameters L31 level series
9
CHAPTER 4: MAINTENANCE
14
General Care
14
Zero Adjust (420 mA, 05 VDC, and 010 VDC only)
14
Vent Tube Drying
15
II
INTRODUCTION
Thank you for purchasing a PT500E series submersible pressure transmitter from APG. We appreciate your business! Please take a few minutes to familiarize yourself with your PT500E and this manual. The PT-500E is a rugged submersible pressure transmitter specially designed for potable water applications requiring NSF/ANSI/CAN 61 and NSF/ANSI/CAN 372 certifications and can be used in other tank liquid level measurement, water and wastewater applications, and well depth 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.
III
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 www.apgsensors.com/resources/warranty-certifications/warranty-returns/. Contact Technical Support to receive a Return Material Authorization before shipping your product back.
Repair and Returns
Should your PT500E series pressure transmitter require service, please contact the factory via phone, email, or online chat. We will issue you a Return Material Authorization (RMA) number with instructions. · Phone: 888-525-7300 · Email: sales@apgsensors.com · Online chat at www.apgsensors.com Please have your PT500E’s part number and serial number available. See Warranty and Warranty Restrictions for more information.
IV
CHAPTER 1: DIMENSIONS AND WIRING
Dimensions
0.99″ [25.1mm]
1/2″ NPTM
1.00″ [25.4mm]
0.89″ [22.5mm] 4.93″ [125.2mm] 7.25″ [184.2mm]
1/2″ NPTM
Ø.188″ THRU
PROTECTIVE NOSE CONE
1.44″ [36.6mm] 1.00″ [25.4mm]
PT500E with Removable Nose Cone
Electrical Pinout Table, Supply Power Table, and System Wiring Diagrams
PT500E Series Pinout Table
Modbus
Red
+ Power
Pigtail
Black
Power
Green
B (TX)
White
A (TX+)
Shield Drain
Case Gnd
4-20mA + Power/Signal Power/Signal — — Case Gnd
Voltage + Power Power + Out Out Case Gnd
Note: Either transducer case OR shield drain wire must be physically connected to lowimpedance earth ground.
PT500E Series Supply Power Table
Modbus
4-20mA
Power Supply 928 VDC
9-28 VDC
* mV/V output calibrated to 10 VDC input
0-5 VDC 9-28 VDC
0-10 VDC 14-28 VDC
mV/V 10 VDC*
1
Modbus System Wiring
Power Supply
+9-28 Vdc GND
Use Shielded Cable Note: Either sensor case OR shield drain wire
must be connected to low-impedance earth ground.
Client Device
RS-485 A (TX+)
RS-485 B (TX-)
120 terminating resistor
Note: When connecting PT-500E sensors to your system, reversing A and B connections may be necessary if sensors do not communicate with controller.
PT-500E modbus series sensor
Sensor 1
V+ B (TX-) A (TX+)
GND
PT-500E modbus series sensor
Sensor 2
V+ B (TX-) A (TX+)
GND
Modbus System Wiring with RST6001
PT-500E modbus series sensor
Sensor 3
V+ B (TX-) A (TX+)
GND
120 terminating resistor at last sensor
Power Supply
+9-28 Vdc GND
Use Shielded Cable Note: Either sensor case OR shield drain wire
must be connected to low-impedance earth ground.
RST-6001 Modbus Controller
USB to computer with APG Modbus software
A B GND +5V
Equivalent 120 terminating resistor internal to RST-6001
Note: An independent +9-28 Vdc power supply is required when using an RST-6001 Modbus Controller. The RST-6001 can only supply +5 Vdc, not the +9-28 Vdc required by the modbus series PT-500E.
PT-500E modbus series sensor
Sensor 1
V+ B A GND
PT-500E modbus series sensor
Sensor 2
V+ B A GND
PT-500E modbus series sensor
Sensor 3
V+ B A
GND
120 terminating resistor at last sensor
2
CHAPTER 2: INSTALLATION AND REMOVAL PROCEDURES AND NOTES
Tools Needed
· Wrench sized appropriately for your PT500E’s process or conduit connection.
Mounting Instructions
Your PT500E can be mounted via NPT process connection or freehanging. Mounting your pressure transducer is easy if you follow a few simple steps: · Never overtighten the sensor. In all cases, tighten the sensor as little as possible to create an
adequate seal. · Always start screwing in your sensor by hand to avoid crossthreading. Thread failure can be a
problem if you damage threads by overtightening them or by crossing threads.
NOTE: If your PT500E has a vent tube, do not seal, cover, or close the vent tube with anything other than an APGprovided venting cap or desiccant drying cartridge (See Figure 4.1 and 4.2). Unapproved seals or covers will prevent proper sensor operation.
Electrical Installation
· Attach the wires of your PT500E to your control system according to the pinout table above.
IMPORTANT: Some manufacturer’s Modbus equipment uses reversed TX+/TX pins. When making connections between APG equipment, reversing connections may be necessary if sensor does not communicate with controller.
IMPORTANT: For lightning transient/surge protection to be effective, either PT500E case OR shield drain wire must be physically connected to lowimpedance earth ground.
3
Removal Instructions
Removing your PT500E 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 fitting 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.
DANGER: Removing your process connected PT500E Pressure Transmitter while there is still pressure in the line could result in injury or death.
IMPORTANT: Any contact with the diaphragm can permanently damage the sensor. Use extreme caution.
CHAPTER 3: PROGRAMMING (MODBUS RTU OUTPUT ONLY)
Modbus Programming
PT500E L5/L31 modbus series sensors use standard Modbus RTU protocol (RS485). The sensors can only operate as server 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 PT500E Modbus Register Lists on pages 5 7.
NOTE: For more information about Modbus RTU, please visit www.modbus.org.
4
Modbus Programming with RST6001 and APG Modbus Software
APG RST6001 Modbus Controller can be used in tandem with APG Modbus to program and control up to 20 PT500E L5 or PT500E L31 sensors. Through APG Modbus, you can monitor the raw readings from the sensor, including level or pressure, temperature and battery voltage, or configure the sensor. See PT500E Modbus Register Lists on pages 5 7.
NOTE: For APG Modbus programming instructions, or to download APG Modbus software, please visit https://www.apgsensors.com/resources/product-resources/software-downloads/
PT500E Modbus Register Lists
The registers listed below are reference addresses. To convert a reference address to an offset address, remove the first digit then subtract one.
Example 1: Reference address = 30300 Offset register = 299 Example 2: Reference address = 40400 Offset register = 399
Input Registers (0x04)
Register 30299 30300 30301 30302 30303-30304 30305-30306 30307 30308 30309 30310
Returned Data Model Type Pressure (L5 PSI; L31 mmH2O) N/A Temperature Reading (in °C, signed) Calculated (raw) N/A N/A Battery Voltage Trip 1 Status Trip 2 Status
NOTE: The Calculated Readings will be returned without a decimal place. In order to obtain the true result, the Decimal Place setting must be taken into account.
5
Holding Registers (0x03) PT500E L5 pressure series
Register 40400 40401 40402 40403 40404 40405 40406 40407 40408 40409 40410 40411 40412 40413 40414 40415 40416 40417 40418 40419 40420 40421 40422-40423 40424-40425 40426-40427 40428-40429 40430 40431 40432 40433 40434 40435 40436-40437 40438-40439 40446 40447-40448 40449-40450 40451-40452 40453-40454
Function Device Address Units Application Type N/A Decimal (Calculated) Max Pressure Full Pressure Zero Offset Pressure Decimal A/D Gain N/A Parameter Default Averaging Calibration Value Calibration Flag Sample Rate Scale Offset Voltage Offset Baud Rate Parity Stop Bit Pressure X^3 Pressure X^2 Pressure X^1 Pressure X^0 Trip 1 Pressure Trip 1 Window Trip 1 Type Trip 2 Pressure Trip 2 Window Trip 2 Type Multiplier Description Temperature Offset Temperature X^3 Temperature X^2 Temperature X^1 Temperature X^0
*Setting is factory calibrated. Do not adjust.
Value Range 1 to 247 0-16 0 or 8
0 3 *0 32,000 PSI 0 32,000 PSI -15,000 30,000 PSI 0 3 *1, 2, 4, 8, 16, 32, 64, 128
0 = No; 1 = Restore Defaults 0 10 *-32,767 32,767 *0 300 10 to 1000 milliseconds *0 65,535 -20,000 20,000 -20 20 0 3 (2400, 9600, 19200) 0 2 (none, even, odd) 0 1 (0 = 1 stop bit; 1 = 2 stop bits) *N/A *N/A *N/A *N/A -15,000 30,000 PSI 0 30,00 PSI 0 29 -15,000 30,000 PSI 0 30,00 PSI 0 29 0.0010 99.9999 (float) A Z, 0 9, /.-,+* (16 char) -20 20 *N/A *N/A *N/A *N/A
6
Holding Registers (0x03) PT500E L31 level series
Register 40400 40401 40402 40403 40404 40405 40406 40407 40408 40409 40410 40411 40412 40413 40414 40415 40416 40417 40418 40419 40420 40421 40422-40423 40424-40425 40426-40427 40428-40429 40430 40431 40432 40433 40434 40435 40436-40437 40438-40439 40440-40441 40442-40443 40444-40445 40446 40447-40448 40449-40450 40451-40452 40453-40454
Function Device Address Units Application Type Volume Units Decimal (Calculated) Max Level Full Level Zero Offset N/A A/D Gain Specific Gravity Parameter Default Averaging Calibration Value Calibration Flag Sample Rate Scale Offset Voltage Offset Baud Rate Parity Stop Bit Pressure X^3 Pressure X^2 Pressure X^1 Pressure X^0 Trip 1 Level Trip 1 Window Trip 1 Type Trip 2 Level Trip 2 Window Trip 2 Type Parameter 1 Parameter 2 Parameter 3 Parameter 4 Parameter 5 Temperature Offset Temperature X^3 Temperature X^2 Temperature X^1 Temperature X^0
*Setting is factory calibrated. Do not adjust.
Value Range 1 to 247 1 = Feet, 2 = Inches, 3 = Meters 0 11 1 7 0 3 *0 65,535 mm 0 65,535 mm 0 610 mm
*1, 2, 4, 8, 16, 32, 64, 128 1 2,000 0 = No; 1 = Restore Defaults 0 10 *0 65,535 *0 300 10 to 1000 milliseconds *0 65,535 -20,000 20,000 -20 20 0 3 (2400, 9600, 19200) 0 2 (none, even, odd) 0 1 (0 = 1 stop bit; 1 = 2 stop bits) *N/A *N/A *N/A *N/A 0 65,535 (mm) 0 65,535 (mm) 0 29 0 65,535 (mm) 0 65,535 (mm) 0 29 0 1,000,000 (mm) 0 1,000,000 (mm) 0 1,000,000 (mm) 0 1,000,000 (mm) 0 1,000,000 (mm) -20 20 *N/A *N/A *N/A *N/A
7
PT500E Modbus Sensor Parameters L5 pressure series
40401 Units
Determines the units of measure for the calculated reading.
0 = PSI
5 = mmH2O 10 = mmHG 14 = inSW
1 = BAR
6 = cmH2O
11 = cmHG
15 = ftSW
2 = mBAR
7 = mH2O
12 = inHG
16 = mSW
3 = kPa
8 = inH2O
13 = kg/cm2
4 = MPa
9 = ftH2O
All H2O pressure measurements @ 20° C.
All HG pressure measurements @ 0° C.
40402 Application Type
Determines the units of measure for the calculated reading. 0 = Standard (units selected in 40401 are displayed) 8 = Custom (units selected in 40401 and multiplier in 40436-40437 are used to compute desired units; description in 40438-40439 is label for measurement)
PT500E Modbus Sensor Parameters L31 level series
40401 Units
Determines the units of measure for the calculated reading when Application Type is set to 0, 1, or 7. 1 = Feet 2 = Inches 3 = Meters
40402 Application Type
Determines the type of calculated reading performed by the sensor. 0 = Distance 1 = Level 2 = Standing Cylindrical Tank with or without Hemispherical Bottom 3 = Standing Cylindrical Tank with or without Conical Bottom 4 = Standing Rectangular Tank with or without Chute Bottom 5 = Horizontal Cylindrical Tank with or without Spherical Ends 6 = Spherical Tank 7 = Pounds (Linear Scaling) 8 = N/A 9 = Vertical Oval Tank 10 = Horizontal Oval Tank 11 = Strapping Chart
8
40403 Volume Units
Determines the units of measure for the calculated reading when Application Type is set to 2-6 or 9-11.
1 = Feet3
5 = Liters
2 = Million Feet3 6 = Inches3
3 = Gallons
7 = Barrels
4 = Meters3
PT500E Modbus Application Parameters L31 level series
Application 0 Distance
Register
40400 40401 40402 40403 40404
Function
Device Address Units Application Type Volume Units Decimal (Calculated)
Application 1 Level
Value Range
1 to 247 1 = Feet, 2 = Inches, 3 = Meters 0 — 0 3
Register
40400 40401 40402 40403 40404
Function
Device Address Units Application Type Volume Units Decimal (Calculated)
Value Range
1 to 247 1 = Feet, 2 = Inches, 3 = Meters 1 — 0 3
Application 2 Volume of Standing Cylindrical Tank ± Hemispherical Bottom
Register 40400 40401 40402 40403 40404 40405 40406
40436-40437 40438-40439
Function
Device Address Units Application Type Volume Units Decimal (Calculated) Max Level Full Level
Value Range
1 to 247 — 2 1 7 0 3 (factory set) 0 65,535 mm
Tank Diameter
0 1,000,000 (mm)
Radius of Bottom Hemisphere 0 1,000,000 (mm)
Diameter
Full Level
or
Bottom Radius
9
Application 3 Volume of Standing Cylindrical Tank ± Conical Bottom
Register 40400 40401 40402 40403 40404 40405 40406
40436-40437 40438-40439
40440-40441
Function
Device Address Units Application Type Volume Units Decimal (Calculated) Max Level Full Level
Value Range
1 to 247 — 3 1 7 0 3 (factory set) 0 65,535 mm
Tank Diameter Cone Diameter(at bottom of cone) Length (height) of Cone
0 1,000,000 (mm) 0 1,000,000 (mm)
0 1,000,000 (mm)
Diameter
Full Level
Cone Length
Cone Diameter
Application 4 Volume of Standing Rectangular Tank ± Chute Bottom
Register 40400 40401 40402 40403 40404 40405 40406
40436-40437
40438-40439
40440-40441
40442-40443
40444-40445
Function Device Address Units Application Type Volume Units Decimal (Calculated) Max Level Full Level
Tank X Dimension
Tank Y Dimension
Chute X Dimension
Chute Y Dimension
Length (height) of Chute
Value Range 1 to 247 — 4 1 7 0 3 (factory set) 0 65,535 mm
0 1,000,000 (mm) 0 1,000,000 (mm) 0 1,000,000 (mm) 0 1,000,000 (mm) 0 1,000,000 (mm)
Full Level or
Tank X
Chute Length
Tank Y Chute Y
Chute X
10
Application 5 Volume of Horizontal Cylindrical Tank ± Hemispherical Ends
Register 40400 40401 40402 40403 40404 40405 40406
40436-40437 40438-40439 40440-40441
Function Device Address Units Application Type Volume Units Decimal (Calculated) Max Level Full Level
Tank Length Tank Diameter Radius of End Hemispheres
Value Range 1 to 247 — 5 1 7 0 3 (factory set) 0 65,535 mm
0 1,000,000 (mm) 0 1,000,000 (mm) 0 1,000,000 (mm)
End Radius
Diameter Length
Full Level
Application 6 Volume of Spherical Tank
Register 40400 40401 40402 40403 40404 40405 40406
40436-40437
Function
Device Address Units Application Type Volume Units Decimal (Calculated) Max Level Full Level
Value Range
1 to 247 — 6 1 7 0 3 (factory set) 0 65,535 mm
Full Level
Diameter
Tank Diameter
0 1,000,000 (mm)
11
Application 7 Pounds (Linear Scaling)
Register 40400 40401 40402 40403 40404 40405 40406
40436-40437
Function Device Address Units Application Type Volume Units Decimal (Calculated) Max Level Full Level
Multiplier (linear scalar)
Value Range 1 to 247 1 = Feet, 2 = Inches, 3 = Meters 7 — 0 3 (factory set) 0 65,535 mm
0 1,000,000 (1000 = 1.000)
Application 9 Volume of Vertical Oval Tank
Register 40400 40401 40402 40403 40404 40405 40406
40436-40437 40438-40439 40440-40441
Function Device Address Units Application Type Volume Units Decimal (Calculated) Max Level Full Level
Tank Length Tank Depth Tank Width
Value Range 1 to 247 — 9 1 7 0 3 (factory set) 0 65,535 mm
0 1,000,000 (mm) 0 1,000,000 (mm) 0 1,000,000 (mm)
Full Width Level
Depth
Length
12
Application 10 Volume of Horizontal Oval Tank
Register 40400 40401 40402 40403 40404 40405 40406
40436-40437 40438-40439 40440-40441
Function Device Address Units Application Type Volume Units Decimal (Calculated) Max Level Full Level
Tank Length Tank Depth Tank Width
Value Range 1 to 247 — 10 1 7 0 3 (factory set) 0 65,535 mm
0 1,000,000 (mm) 0 1,000,000 (mm) 0 1,000,000 (mm)
Full Level
Depth Width
Length
Application 11 Strapping Chart (Polynomial Values)
Register 40400 40401 40402 40403 40404 40405 40406
40436-40437 40438-40439 40440-40441 40442-40443
Function Device Address Units Application Type Volume Units Decimal (Calculated) Max Level Full Level
X^3 Coefficient X^2 Coefficient X^1 Coefficient X^0 Coefficient
Value Range 1 to 247 1 = Feet, 2 = Inches, 3 = Meters 11 1 7 0 3 (factory set) 0 65,535 mm
0 1,000,000 0 1,000,000 0 1,000,000 0 1,000,000
13
CHAPTER 4: MAINTENANCE
General Care
Your PT500E series pressure transmitter is very low maintenance and will need little care as long as it is installed correctly. However, in general, you should:
· For process connected sensors, keep the transmitter and the area around it generally clean. · Avoid applications for which the transmitter was not designed, such as extreme temperatures, contact
with incompatible corrosive chemicals, or other damaging environments. · Inspect the threads whenever you remove the transmitter from duty or change its location. · Avoid touching the diaphragm. Contact with the diaphragm, especially with a tool, could permanently
shift the output and ruin accuracy. · Clean the diaphragm or the diaphragm bore with extreme care. If using a tool is required, make sure it
does not touch the diaphragm.
IMPORTANT: Any contact with the diaphragm can permanently damage the sensor. Use extreme caution.
Zero Adjust (420 mA, 05 VDC, and 010 VDC only)
The zero output (4mA, or 0 VDC) can be adjusted by holding a magnet perpendicular to the can, approximately 1-1/2″ from the top or bottom of the can.
Holding the magnet close to the top of the can increases the output (See Figure 3.1). Holding the magnet close to the bottom of the can decreases the output (See Figure 3.2).
If the zero output values do not change right away, hold the magnet in place near the top of the can until the values change, for up to two minutes. If there is no change, repeat the procedure near the bottom of the can. If there is still no change, consult the factory.
Unvented PT500E transmitters do not automatically adjust to changes in barometric pressure. We recommend that PT500E transmitters be zeroed upon receipt, and after major weather events.
Figure 3.1 14
Figure 3.2
NOTE: Span calibration must be done at the factory for all analog models.
Vent Tube Drying
Condensation in the vent tube can damage the electronics in your sensor, resulting in unreliable readings. APG offers two methods of preventing vent tube condensation: a venting cap, and a desiccant drying cartridge. The venting cap is a PVC tube with a hydrophobic patch that allows moisture to pass out of the tube without allowing water in (See Figure 4.1). The cap is sealed by an oring, and is easily installed in the field. The desiccant drying cartridge with vent tube adapter absorbs any moisture in the vent tube to keep vapor from condensing (See Figure 4.2). The installation of the desiccant drying cartridge is quick and easy. Common installation methods are cable tie, Velcro, and cable clamps.
IMPORTANT: Do NOT use desiccant cartridge in the presence of vapors or liquids containing phosphate esters, synthetic lubricants, hydrocarbon solvents, methanol, acetone, lacquer solvents, or other organics.
Figure 4.1
Figure 4.2 NOTE: Desiccant crystals change from blue to pink as they become saturated. Cartridge must be replaced when all crystals have saturated.
15
Automation Products Group, Inc. Tel: 1 888-525-7300 or 1 435-753-7300
e-mail: sales@apgsensors.com www.apgsensors.com
Automation Products Group, Inc. 1025 W. 1700 N. Logan, UT 84321
Documents / Resources
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