APG Sensors MPI-T Magnetostrictive Level Sensors User Manual

: June 12, 2024
: APG Sensors

Table of Contents

MPI-T Magnetostrictive Level Sensors
Product Information
Product Usage Instructions
References
Read User Manual Online (PDF format)
Download This Manual (PDF format)

MPI-T Magnetostrictive Level Sensors

Product Information

The MPI-T Magnetostrictive Level Sensors are intrinsically safe
level sensors with titanium stem probes. They are manufactured by
APG and are part of the MPI series. The product is designed for
hazardous locations and comes with relevant safety approvals and
ratings.

The sensors have a label that includes the model number, part
number, and serial number. The label also provides electrical
ratings and approvals information. The product is certified with
ATEX Certificate Number: Sira 19ATEX2072X.

Product Usage Instructions

1. Installation and Removal Procedures:

For proper installation, refer to drawing 9005491
(Intrinsically Safe Installation Drawing for Hazardous Locations)
on page 22 of the user manual.
Before removing the cover, ensure that the circuit is open or
de-energized. Keep the cover tight while circuits are alive.

2. Programming:

Refer to Chapter 3 of the user manual for programming
instructions. It provides detailed information on how to program
and configure the MPI-T level sensor.

3. Maintenance:

Follow the general care instructions provided in Chapter 4 of
the user manual.
In case of repair or returns, refer to the Repair and Returns
section in Chapter 4 for guidance.

4. Hazardous Location Installation:

To ensure safety and meet listed approvals, it is crucial to
follow the Intrinsically Safe Installation Drawing for Hazardous
Locations provided in Chapter 5 of the user manual.

Note: The model MPI-T contains titanium in excess of 7.5% for
Group II. Take necessary care while handling the sensor.

MPI-T Magnetostrictive Level Sensors User Manual
For Intrinsically Safe, Titanium Stem Probes

APG
R

Doc #9005624 Part #200338 Rev C, 09/2022

Table of Contents
Introduction …………………………………………………………………………………………………. iii
Warranty and Warranty Restrictions………………………………………………………….. iv
Chapter 1: Specifications and Options…………………………………………………………… 1
Dimensions ……………………………………………………………………………………………………………………….1 Specifications ………………………………………………………………………………………………………………….. 2 Model Number Configurator……………………………………………………………………………………………. 3 System Wiring Diagrams and IS Use Case Diagrams …………………………………………………. 4-5
Chapter 2: Installation and Removal Procedures and Notes…………………………6
Tools Needed……………………………………………………………………………………………………………………. 6 ATEX Stated Conditions of Use……………………………………………………………………………………….. 6 Physical Installation Notes …………………………………………………………………………………………….. 6 Physical Installation Instructions ………………………………………………………………………………….. 7 Electrical Installation ……………………………………………………………………………………………………… 7 Removal Instructions ……………………………………………………………………………………………………… 8
Chapter 3: Programming ………………………………………………………………………………..9
Modbus Programming …………………………………………………………………………………………………….. 9 Modbus Programming with RST-6001 and APG Modbus Software ……………………………….. 9 Modbus Register Lists for MPI-T ………………………………………………………………………………..9-10 MPI-T Modbus Sensor Parameters…………………………………………………………………………… 11-15 MPI-T Modbus Application Type Parameters…………………………………………………………. 16-20
Chapter 4: Maintenance ………………………………………………………………………………. 21
General Care …………………………………………………………………………………………………………………… 21 Repair and Returns………………………………………………………………………………………………………… 21
Chapter 5: Hazardous Location Installation…………………………………………………22
Intrinsically Safe Installation Drawing for Hazardous Locations ……………………………….. 22

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Introduction
Thank you for purchasing an MPI series magnetostrictive level sensor from APG. We appreciate your business and your trust. Please take a few minutes to familiarize yourself with your MPI and this manual.
The MPI series magnetostrictive level sensor provides highly accurate and repeatable level readings in a wide variety of liquid level measurement applications. It is certified for installation in Class I, Division 1 and Class I, Zones 0 hazardous areas in the US and Canada by CSA, and ATEX and IECEx for Europe and the rest of the world. The MPI-T’s large, buoyant, and robust floats allow it to be used in harsh applications where fouling or buildup might otherwise be of concern. Additionally, the 1″ titanium stem provides compatibility in a wider range corrosive media.
Reading your label
Every APG instrument comes with a label that includes the instrument’s model number, part number, and serial number. Please ensure that the part number on your label matches your order. The following electrical ratings and approvals are also listed on the label. Please refer to the product page on APG’s website for relevant certificates.

C237484US

8-24 VDC, Imax = 280 mA Class I, Division 1, Groups C, D, T4 Class I, Zone 0; AEX ia IIB T4 Ga; Ex ia IIB T4 Ga, IP65 Ta = -40°C to 85°C

Intrinsically Safe Wiring Requirements: Ui= 28 VDC, Ii = 280 mA, Pi = 0.850 W , Li = 3.50 H, Ci = 0.374 F

ATEX Certificate Number: Sira 19ATEX2072X

II 1G Ex ia IIB T4 Ga Ta: -40°C to 85°C

Ui = 28 V, Ii = 280 mA, Pi = 0.850 W, Li = 3.50 H, Ci = 0.374 F
IECEx SIR 19.0026X Ex ia IIB T4 Ga Ta: -40°C to 85°C

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IMPORTANT: MPI-T level sensor MUST be installed according to drawing 9005491
(Intrinsically Safe Installation Drawing for Hazardous Locations) on page 22 to meet listed approvals. Faulty installation will invalidate all safety approvals and ratings.
DANGER: OPEN CIRCUIT BEFORE REMOVING COVER or KEEP COVER TIGHT WHILE CIRCUITS ARE ALIVE;
AVERTISSEMENT — COUPER LE COURANT AVANT D’ENLEVER LE COUVERCLE, ou GARDER LE COUVERCLE FERME TANT QUE LES CIRCUITS SONT SOUS TENSION.
DANGER: WARNING — EXPLOSION HAZARD — SUBSTITUTION OF COMPONENTS MAY IMPAIR INTRINSIC
SAFETY; AVERTISSEMENT — RISQUE D’EXPLOSION — LA SUBSTITION DE COMPOSANT PEUT AMELIORER LA SECURITE INTRINSIQUE.
DANGER: WARNING — EXPLOSION HAZARD — DO NOT DISCONNECT EQUIPMENT UNLESS POWER HAS
BEEN SWITCHED OFF OR THE AREA IS KNOWN TO BE NON-HAZARDOUS; AVERTISSEMENT — RISQUE D’EXPLOSION — AVANT DE DECONNECTER L’EQUIPEMENT, COUPER LE COURANT OU S’ASSURER QUE L’EMPLACEMENT EST DESIGNE NON DANGEREUX.
Warning: — The model MPI-T contains titanium in excess of 7.5% for Group II and care needs to be taken
to avoid ignition hazards due to impact or friction; AVERTISSEMENT — Le modèle MPI-T contient plus de 7,5% de tetane pour le groupe II et des precautions doivent être prises pour eviter un risque d’inflammation due aux chocs ou aux frottements.
IMPORTANT: Only the combustion gas detection performance of the instrument has
been tested.
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: Specifications and Options
· Dimensions
MPI-T Sensor and Float Dimensions

3/4″ NPT 1/2″ NPT
4.94″ 4.15″

4.21″ 3.74″

Note: For dual dimensions, large housing dimensions are above small housing dimensions.

6.84″ – 6.97″ 6.05″ – 6.18″

5.71″ 4.92″ 5.00″ 4.25″

3/4″ NPT 1/2″ NPT Housing Connection Location
Ø 0.27″

1.90″
S1 Dead-Band
(from Zero Reference to
Float Ref.)

ZERO REFERENCE
GROUND SCREW

I & J I & J

Float Options Y & Z / L & M

4.98″

Float Ref. S1=10.63″ S2=6″

5.50″

Float Ref. S1=10″ S2=6.5″

Min. 48″ Max. 300″

3.00″ I & J

3.08″ Y & Z 2.00″ L & M

S2
Dead-Band
(from Float Ref. to bottom
of stem)

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· Specifications
Performance
Resolution Accuracy Digital Temp Sensor Accuracy
Environmental
Operating Temperature Enclosure Protection
Electrical
Supply Voltage Typical Current Draw Protection
Materials of Construction
Housing Stem Mounting (slide) Compression Fitting (slide)
Connectivity
Output
Programming
RS-485

0.04 in. (1 mm) ±0.05% of Full Scale or 1 mm (whichever is larger) ±1°C
-40° to 185° F (-40° to 85° C) NEMA 4X, IP65
8-24 VDC on sensor 25 mA Reverse Polarity and Surge (per IEC 61000-4-5, 4-6, 4-7)
Cast aluminum, epoxy coated Titanium 2 316L SS Aluminum with Neoprene bushing
Modbus RTU (RS-485)
Optional RST-6001 USB-to-RS-485 converter

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· MPI-T Model Number Configurator

Model Number: MPI – R 5 – – S T – – –

AB C

D E

F GH I

J

K

L

A. Stem Type R 1 in. diameter, rigid

I. Stem Material T Titanium 2

B. Output

J. Total Stem Length in Inches

5 Modbus RTU, with surge protection, Intrinsically Safe __ Min. 48 in. – Max. 300 in.

C. Housing Type
All Housing Die-cast Aluminum, NEMA 4X, IP65, Blue
__ Large Housing A Small Housing
D. Float 1 (Top Float) Z 5.5h x 3d in. Red Polyurethane (0.65 SG) Y 5.5h x 3d in. Blue Polyurethane (0.94 SG) M 5.5h x 2d in. Red Polyurethane (0.57 SG) L 5.5h x 2d in. Blue Polyurethane (0.94 SG) J 5h x 3d in. Oval Titanium 2 (0.60 SG) I 5h x 3d in. Oval Titanium 2 (0.92 SG) N None
E. Float 2 (optional) N None Y 5.5h x 3d in. Blue Polyurethane (0.94 SG) L 5.5h x 2d in. Blue Polyurethane (0.94 SG) I 5h x 3d in. Oval Titanium 2 (0.92 SG)
F. Mounting Type P NPT Plug 150# N None
G. Mounting Size 2 2 in. 3 3 in. N None

K. Temperature Sensor Options N None 1D Digital Temperature Sensor A, 12 in. from bottom of
probe
2D Digital Temperature Sensors A, B 3D Digital Temperature Sensors A, B, C 4D Digital Temperature Sensors A, B, C, D 5D Digital Temperature Sensors A, B, C, D, E 6D Digital Temperature Sensors A, B, C, D, E, F 7D Digital Temperature Sensors A, B, C, D, E, F, G
Note: Temperature sensors B – G are spaced evenly between A and probe’s zero reference.
L. Custom Housing-Electrical Connection N None B Cable Gland (Cable sold separately) C 4-pin M12 Micro Connector Female D 4-pin M12 Micro Connector Male – 90° F 4-pin M12 Micro Connector Female – 90° G 90° Elbow M 4-pin M12 Micro Connector Male
Note: This option is standard. Note: Connectors available for use with Small Housing only. For
Large Housing, choose N None.

H. Mounting Connection S Slide with Compression Fitting (adjustable)

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· System Wiring Diagrams and IS Use Case Diagrams

Modbus System Intrinsically Safe Wiring For MPI-T5 Sensors

Power Supply

+8-24 Vdc GND

Use Shielded Cable

Wiring T’s must be located on controller/supply side of IS barriers.

Server Device

RS-485 A (TX+) RS-485 B (TX-)

120 terminating resistor may be necessary for long
cable runs.

See Hazardous Installation Drawing for Intrinsically Safe installation requirements. Otherwise, wire directly.

Note: When connecting MPI sensors to your system, reversing A and B connections may be necessary if sensors do not communicate with Modbus Server device.

MPI Sensor
Sensor 1
V+ B (TX-) A (TX+)
GND

MPI Sensor
Sensor 2
V+ B (TX-) A (TX+)
GND

MPI Sensor
Sensor 3
V+ B (TX-) A (TX+)
GND

120 terminating resistor across A & B terminals of last or only sensor, if necessary.
For installations without IS barriers only.

Modbus System Intrinsically Safe Wiring with RST-6001 For MPI-T5 Sensors

Power Supply

+8-24 Vdc GND

Use Shielded Cable

Wiring T’s must be located on controller/supply side of IS barriers.

RST-6001 Modbus Controller
USB to computer with APG Modbus software

A B -5V +5V
Equivalent 120 terminating resistor internal to RST-6001

See Hazardous Installation Drawing for Intrinsically Safe installation requirements. Otherwise, wire directly.

Note: An independent +8-24 Vdc power supply is required when using an RST-6001 Modbus Controller. The RST-6001 can only supply ±5 Vdc, not the +8-24 Vdc required by the MPI.

MPI sensor
Sensor 1
V+ B A GND

MPI sensor
Sensor 2
V+ B A GND

MPI sensor
Sensor 3
V+ B A GND

120 terminating resistor across A & B terminals of last or only sensor, if necessary.
For installations without IS barriers only.

IMPORTANT: Refer to Chapter 5 for Intrinsically Safe Installation Drawing for Hazard-
oua Locations

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MPI – MDI Use Case Diagram
Hazardous Area
Zone 1
MDI Modbus Address: Server Controling: Sensor 1

Zone 0 or Zone 1
MPI Sensor Modbus Address: 1

Single MDI controlling a single MPI sensor · MDI is located in Zone 1 area. MPI can be in Zone 0 or Zone 1 without additional barriers. · MDI is battery powered; allows for software-based switchable power for MPI. · MPI is powered by MDI battery. · No external controller. · No IS barrier required. · Any changes to MPI settings done via MDI buttons.

MPI – MDI with Passive Controller use Case Diagram

Non-hazardous Area

Hazardous Area

Zone 1
MDI Modbus Address: Server Controling: Sensor 1

Zone 0 or Zone 1

Passive Control Equipment Modbus: Sniffer Sniffing: MDI

Approved IS Barrier

MPI Sensor Modbus Address: 1

Single MDI controlling a single MPI sensor with Passive Control Equipment · MDI is located in Zone 1 area. MPI can be in Zone 0 or Zone 1 without additional barriers. · MDI is battery powered; allows for software-based switchable power for sensor. · MPI is powered by MDI battery. · External controller passively reads (Sniffs) readings from MDI. · External controller can activate MDI. · Approved IS Barrier required between Passive Control Equipment and MDI. · Auxiliary connection required for MDI. · Any changes to MPI settings done via MDI buttons.

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Chapter 2: Installation and Removal Procedures and Notes
· Tools Needed
You will need the following tools to install your MPI level sensor: · Wrench sized appropriately for MPI mounting · Wrench sized appropriately for conduit connections · Flat-head screwdriver for wire terminals · Channel lock pliers for tightening compression fitting · 1/8″ Hex Allen wrench for screws on float stop(s).

· ATEX Stated Conditions of Use
· Under certain extreme circumstances, the non-metalic parts incorporated in the enclosure of this equipment may generate an ignition-capable level of electrostatic charge. Therefore the equipment shall not be installed in a location where the external conditions are conducive to the build-up of electrostatic charge on such surfaces. In addition, the equipment shall only be cleaned with a damp cloth.
· The enclosure is manufactured from Aluminum. In rare cases, ignition sources due to impact and friction sparks could occur. This shall be considered during installation.

· Physical Installation Notes

The MPI-T should be installed in an area–indoors or outdoors–which meets the following conditions: · Ambient temperature between -40°C and 85°C (-40°F to +185°F) · Relative humidity up to 100% · Altitude up to 2000 meters (6560 feet) · IEC-664-1 Conductive Pollution Degree 1 or 2 · IEC 61010-1 Measurement Category II · No chemicals incompatible with Titanium Grade 2 · No chemicals corrosive to stainless steel (such as NH3, SO2, Cl2, etc.) (Not applicable to plastic-type stem options) · Ample space for maintenance and inspection

Additional care must be taken to ensure: · The probe is located away from strong magnetic fields, such as those produced by motors, transform-
ers, solenoid valves, etc. · The medium is free from metallic substances and other foreign matter. · No ignition hazards exist due to impact or friction with the titanium stem. · The probe is not exposed to excessive vibration. · The float(s) fit through the mounting hole. If the float(s) does/do not fit, it/they must be mounted on
the stem from inside the vessel being monitored. · The float(s) is/are oriented properly on the stem (See Figure 2.1). MPI-T floats are typically installed by
customer.

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Taper
UP Figure 2.1

IMPORTANT: Floats must be oriented
properly on the stem, or sensor readings will be inaccurate and unreliable. Untapered floats will have a sticker or etching indicating the top of the float. Remove sticker prior to use.

IMPORTANT: MPI-T level sensor MUST be installed according to drawing 9005491
(Intrinsically Safe Installation Drawing for Hazardous Locations) on page 22, to meet listed approvals. Faulty installation will invalidate all safety approvals and ratings.

· Physical Installation Instructions
· When lifting and installing the sensor be sure to minimize the bending angle between the rigid stem at the top and bottom of the sensor and the flexible stem in-between. Sharp bends at those points could damage the sensor. (Not applicable for non-flexible probe stems.)
· If your sensor’s stem and floats fit through the mounting hole, carefully lower the assembly into the vessel, then secure the sensor’s mounting option to the vessel.
· If the floats do not fit, mount them on the stem from inside the vessel being monitored. Then secure the sensor to the vessel.
· For sensors with float stops, refer to the assembly drawing included with the sensor for float stop installation locations.
· Electrical Installation
· Remove the housing cover of your MPI. · Feed system wires into MPI through conduit openings. Fittings must be UL/CSA Listed for CSA
installation and IP65 Rated or better. · Connect wires to MPI terminals. Use crimped ferrules on wires, if possible. · Replace the housing cover.
See System Wiring Diagrams and IS Use Case Diagrams (pages 4-5) for Modbus wiring examples.

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· Removal Instructions
Removing your MPI level sensor from service should be done with care. · If the floats on your sensor fit through the mounting hole, carefully lift the entire sensor assembly out of and away from the vessel. · If the floats on your sensor do not fit through the mounting hole, they will need to be removed from the stem before the sensor can be removed. Be sure to drain the vessel being monitored to allow access to the floats and stem for removal. · Clean the stem and floats of any build up or debris and inspect for damage. · Store your sensor in a dry place, at a temperature between -40° F and 180° F.

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Chapter 3: Programming
· Modbus Programming
MPI-T series sensors use standard Modbus RTU protocol (RS-485). The sensors can only operate as client 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. See MPI-T Modbus Register Lists on pages 9 and 10.

NOTE: For more information about Modbus RTU, please visit www.modbus.org.

· Modbus Programming with RST-6001 and APG Modbus Software
An APG RST-6001 Modbus Controller can be used in tandem with APG Modbus software to program and control up to 20 MPI-T series sensors. Through APG Modbus, you can monitor the raw readings from the sensor, configure the data for distance, level, volume, or weight, and enter measurements for a strapping chart. See MPI-T Modbus Register Lists on pages 9 and 10.

NOTE: For APG Modbus programming instructions, or to download APG Modbus soft-
ware, please visit www.apgsensors.com/suppport.

· Modbus Register Lists for MPI-T

Input Registers (0x04)

Register 30299 30300 30301 30302 30303-30304 30305-30306 30307 30308

Returned Data Model Type Raw Top Float Reading (in mm, unsigned) Raw Bottom Float Reading (in mm, unsigned) Temperature Reading (in 0C, signed) Calculated Top Float Reading (in selected Units) Calculated Bottom Float Reading (in selected Units) Version API 18.2 TEMP (in 0C, signed)

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.

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Holding Registers (0x03)
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 40201

Function Device Address Units Application Type Volume Units Decimal Place Max Distance Full Distance Empty Distance Sensitivity Pulses Blanking NA Averaging Filter Window Out of Range Samples Sample Rate Multiplier Offset Pre filter Noise limit Temperature Select RTD Offset (0C) Float Window 1st Float Offset 2nd Float Offset Gain Offset 4 mA Set Point 20 mA Set Point 4 mA Calibration 20 mA Calibration t1d t1w t1t t2d t2w t2t Parameter 1 Data Parameter 2 Data Parameter 3 Data Parameter 4 Data Parameter 5 Data Baud Rate Restore to Factory Defaults

Value Range 1 to 247 1, 2, 3 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 1, 2, 3, 4, 5, 6, 7 0, 1, 2, 3 0 to 32,768 mm 0 to 32,768 mm 0 to 32,768 mm 0 to 100 5 to 20 0 to 10,364 mm NA 1 to 50 0 to 10,364 mm 1 to 255 50 to 1,000 msec. 1 to 1,999 (1000 = 1.000) -10,364 to 10,364 mm 0 to 10,364 mm 0 to 255 0 to 8 NA 0 to 1,000 mm 0=1 float -10,364 to 10,364 -10,364 to 10,364 0 to 255 NA NA NA NA NA NA NA NA NA NA* 0 to 1,000,000 mm 0 to 1,000,000 mm 0 to 1,000,000 mm 0 to 1,000,000 mm 0 to 1,000,000 mm 0, 1, 2, 3, 4 1

*These registers are not used by the MPI-T, even though they are labeled in the APG Modbus software. Setting is factory calibrated. Do not adjust.

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· MPI-T Modbus Sensor Parameters

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
See MPI-T Modbus Application Type Parameters pages 16-20.
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

40404 – Decimal Place
Determines the number of decimal places included in the Calculated Reading(s). The Calculated Reading will always be returned as a whole number.
For example, a Calculated Reading of 1126.658 (gallons, ft3, etc.) will be returned as follows: Decimal Place = 0 Volume = 1127 (rounded to nearest whole number) Decimal Place = 1 Volume = 11267 (divide by 10 to get true result) Decimal Place = 2 Volume = 112666 (divide by 100 to get true result) Decimal Place = 3 Volume = 1126658 (divide by 1000 to get true result)

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40405 – Maximum Distance (Factory Calibrated)
Sets the distance (beginning from the Zero Reference) to the point where the sensor will stop looking for float signals, usually the bottom of the stem. A float beyond the Maximum Distance value will not be detected.
40406 – Full Distance
Sets the positive distance (beginning from the sensor Zero Reference) to the point where the monitored vessel is considered full.
40407 – Empty Distance
Sets the positive distance (beginning from the Zero Reference) to the point where the monitored vessel is considered empty (usually the bottom of the stem).
40408 – Sensitivity (Factory Calibrated)
Sets the level of gain that is applied to the returning float signal.
40409 – Pulses (Factory Calibrated)
Controls the duration of the signal being sent down the magnetostrictive wire.
40410 – Blanking (Factory Calibrated)
Sets the blanking distance, which is the zone from the Zero Reference of the sensor to the point from which the first signal will be valid. Signals from a float in the blanking area will be ignored.
40412 – Averaging
Sets the number of qualified received float signals to average for the raw reading. Qualified received signals are placed in a first-in, first-out buffer, the contents of which are averaged for the raw reading. The larger the number of qualified received signals being averaged, the smoother the reading will be, and the slower the reading will be to react to quickly changing targets.

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40413 – Filter Window
Determines the physical range (0 – 10,364 mm) of qualified received signals, based on the current raw reading. Signals beyond the +/- Filter Window range of the current reading will not qualify unless the average moves. Signals outside the extents of the Filter Window are written to the Out of Range samples buffer (Holding Register 40414). See Figure 3.1.

Example: Window = 300 mm Out of Range Samples = 10

Samples are rejected within this area unless they persist for 10 consecutive samples

All samples are accepted within this area

150 mm 150mm

Min. Reading

Current value of Distance

Samples are rejected within this area unless they persist for 10 consecutive samples
Max. Reading

Figure 3.1

40414 – Out of Range Samples

Sets the number of consecutive samples outside the Filter Window (Holding Register 40413) necessary to automatically adjust the current reading and move the Filter Window.

40415 – Sample Rate
Sets the update rate of the sensor (between 50 – 1000 ms). Shorter time delays allow for quicker sensor response times to changing levels. Typical setting is 200 ms. Settings under 200 ms are not recommended.

40416 – Multiplier (Factory Calibrated)
Calibrates the distance reading span. The Multiplier is shown by the values 1 – 1999, but these values are understood to represent 0.001 – 1.999. The default of 1000 (i.e. 1.000) is used for most applications.

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40417 – Offset (Factory Calibrated)
Sets the Zero Reference of the sensor, the point from which the calculated distance is measured.

40418 – Pre filter
Defines the physical range (0 – 10,364 mm) of the start up (pre-filter) window. Four sample readings must be found within the Pre filter window for the MPI sensor to successfully start up. This register is only to be used for diagnostics under factory direction.
40419 – Noise limit
Sets the limit for number of signals (0-255) outside the Pre filter range for the MPI at start up. If the Noise Limit is reached before four readings register within the Pre filter window, the MPI will not start up. This register is only to be used for diagnostics under factory direction.

40420 – Temperature Select

Selects the temperature sensor reading to be displayed in Input Register 30302.

MPI-T sensors can accomodate up to seven digital temperature sensors in the stem.

0 = Average of sensors A – G 1 = Digital Temperature Sensor A 2 = Digital Temperature Sensor B 3 = Digital Temperature Sensor C 4 = Digital Temperature Sensor D

5 = Digital Temperature Sensor E 6 = Digital Temperature Sensor F 7 = Digital Temperature Sensor G 8 = N/A

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40422 – Float Window (Factory Calibrated)
Sets the distance (0 – 1000 mm) between the first (i.e. top) float and the point at which the sensor will begin looking for the second (bottom) float. 0 indicates a single float.
40423 – 1st Float Offset
Used to calibrate top float reading (-10,364 – 10,364 mm).
40424 – 2nd Float Offset
Used to calibrate bottom float reading (-10,364 – 10,364 mm).
40425 – Gain Offset (Factory Calibrated)
Used to move the centerline of the float response signal to optimize signal strength (0 – 255).
40446 – Baud Rate
Selects the communication speed between the sensor and the Server Device. All devices on the network must use the same Baud Rate. APG Modbus Server and Client devices default to 9600 Baud.
0 = 9600 1 = 19200 2 = 38400 3 = 57600 4 = 115200
40201 – Restore To Factory Defaults
Writing a 1 to this Holding Register will erase any settings changes and restore the factory default settings.

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15

· MPI-T Modbus Application Type Parameters

Application 0 – Distance

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 0 -0 – 3

Application 1 – Level
Register 40400 40401 40402 40403 40404 40405 40406 40407

Function Device Address Units Application Type Volume Units Decimal (Calculated) Max Distance Full Distance Empty Distance

Value Range 1 to 247 1 = Feet, 2 = Inches, 3 = Meters 1 -0 – 3 (factory set) 0 – 32,768 mm 0 – 32,768 mm

Application 2 – Volume of Standing Cylindrical Tank ± Hemispherical Bottom

Register 40400 40401 40402 40403 40404 40405 40406 40407
40436-40437 40438-40439

Function Device Address Units Application Type Volume Units Decimal (Calculated) Max Distance Full Distance Empty Distance
Tank Diameter Radius of Bottom Hemisphere

Value Range

1 to 247

—

2

1 – 7

0 – 3 (factory set) 0 – 32,768 mm

Full Level

0 – 32,768 mm

0 – 1,000,000 (mm) or 0 – 1,000,000 (mm)

Diameter Bottom Radius

16

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Application 3 – Volume of Standing Cylindrical Tank ± Conical Bottom

Register 40400 40401 40402 40403 40404 40405 40406 40407
40436-40437 40438-40439 40440-40441

Function Device Address Units Application Type Volume Units Decimal (Calculated) Max Distance Full Distance Empty Distance

Value Range 1 to 247 -3 1 – 7 0 – 3 (factory set) 0 – 32,768 mm 0 – 32,768 mm

Full Level

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 Cone Length

Cone Diameter

Application 4 – Volume of Standing Rectangular Tank ± Chute Bottom

Register 40400 40401 40402 40403 40404 40405 40406 40407
40436-40437 40438-40439 40440-40441 40442-40443 40444-40445

Function Device Address Units Application Type Volume Units Decimal (Calculated) Max Distance Full Distance Empty Distance
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 – 32,768 mm

Full Level

0 – 32,768 mm

0 – 1,000,000 (mm)

or

0 – 1,000,000 (mm)

Tank X

Chute Length

Tank Y Chute Y

Chute X

NOTE: For all applications other than Distance, Empty Distance is usually the same as
Max Distance.

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17

Application 5 – Volume of Horizontal Cylindrical Tank ± Hemispherical Ends

Register 40400 40401 40402 40403 40404 40405 40406 40407
40436-40437 40438-40439 40440-40441

Function Device Address Units Application Type Volume Units Decimal (Calculated) Max Distance Full Distance Empty Distance
Tank Length Tank Diameter Radius of End Hemispheres

Value Range 1 to 247 -5 1 – 7 0 – 3 (factory set) 0 – 32,768 mm 0 – 32,768 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 40407
40436-40437

Function Device Address Units Application Type Volume Units Decimal (Calculated) Max Distance Full Distance Empty Distance
Tank Diameter

Value Range

1 to 247

—

6 1 – 7

Full Level

0 – 3

(factory set)

0 – 32,768 mm

0 – 1,000,000 (mm)

Diameter

18

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Application 7 – Pounds (Linear Scaling)

Register 40400 40401 40402 40403 40404 40405 40406 40407
40436-40437

Function Device Address Units Application Type Volume Units Decimal (Calculated) Max Distance Full Distance Empty Distance
Multiplier (linear scalar)

Application 8 – N/A

Application 9 – Volume of Vertical Oval Tank

Register 40400 40401 40402 40403 40404 40405 40406 40407
40436-40437 40438-40439 40440-40441

Function Device Address Units Application Type Volume Units Decimal (Calculated) Max Distance Full Distance Empty Distance
Tank Length Tank Depth Tank Width

Value Range 1 to 247 1 = Feet, 2 = Inches, 3 = Meters 7 -0 – 3 (factory set) 0 – 32,768 mm 0 – 32,768 mm
0 – 1,000,000 (1000 = 1.000)
Value Range 1 to 247 -9 1 – 7 0 – 3 (factory set) 0 – 32,768 mm 0 – 32,768 mm
0 – 1,000,000 (mm) 0 – 1,000,000 (mm) 0 – 1,000,000 (mm)

Full Width Level

Depth

Length

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19

Application 10 – Volume of Horizontal Oval Tank

Register 40400 40401 40402 40403 40404 40405 40406 40407
40436-40437 40438-40439 40440-40441

Function Device Address Units Application Type Volume Units Decimal (Calculated) Max Distance Full Distance Empty Distance
Tank Length Tank Depth Tank Width

Value Range 1 to 247 -10 1 – 7 0 – 3 (factory set) 0 – 32,768 mm 0 – 32,768 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 40407
40436-40437 40438-40439 40440-40441 40442-40443

Function Device Address Units Application Type Volume Units Decimal (Calculated) Max Distance Full Distance Empty Distance
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 – 32,768 mm 0 – 32,768 mm
0 – 1,000,000 0 – 1,000,000 0 – 1,000,000 0 – 1,000,000

20

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Chapter 4: Maintenance
· General Care
Your MPI-T level sensor is very low maintenance and will need little care as long as it was installed correctly. However, in general, you should:
· Periodically inspect your MPI-T to ensure the stem and floats are free of any heavy buildup that might impede the movement of the floats. If sediment or other foreign matter becomes trapped between the stem and float(s), detection errors can occur.
· If you need to remove the float(s) from the stem of your MPI, be sure to note the orientation of the float(s) prior to removal. This will help ensure proper re-installation of the float(s).
· Ensure the housing cover is snuggly secured. If the cover becomes damaged or is misplaced, order a replacement immediately.
· Repair and Returns
Should your MPI level sensor 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 part number and serial number available. See Warranty and Warranty Restrictions for more information.
IMPORTANT: All repairs and adjustments of the MPI level sensor must be made by the
factory. Modifying, disassembling, or altering the MPI on site is strictly prohibited.

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21

Chapter 5: Hazardous Location Installation and Certification
· Intrinsically Safe Installation Drawing for Hazardous Locations

22

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ZONE REV

—

B

DESCRIPTION See Change Order

REVISIONS CHANGE ORDER CO-3982

DATE 06/01/2020

APPROVED A. Fullmer

RS485+ RS485V+ V-

Unclassified Location

Associated Apparatus with Entity Parameters

Voc (or Uo) Vmax (or Ui)

Isc (or Io) Imax (or Ii)

Po

Pi

Ca (or Co) Ci + Ccable

La (or Lo) Li + Lcable

Hazardous Location
Class I, Division 1, Groups C,D T4 Class I, Zone 0, AEx ia IIB T4 Ga Ex ia IIB T4 Ga, Ta -40°C to 85°C

MPI – RS485 RTU

A B VIN GND

Vmax (or Ui) = 28V

Imax (or Ii) = 280mA

Pi

= 850mW

Ci

= 0.374uF

Li

= 3.50uH

– Installation must be in accordance with NEC Articles 504 and 505.

PROPRIETARY AND CONFIDENTIAL
THIS DRAWING IS THE PROPERTY OF AUTOMATION PRODUCTS GROUP, INC.
LOGAN, UTAH AND MAY NOT BE USED, REPRODUCED, PUBLISHED, OR
DISCLOSED TO OTHERS WITHOUT WRITTEN CONSENT OF THE COMPANY.

APPROVALS
DRWN
C. Chidester
CHKD
S. Hutchins
APVD
R. Barson

DATE 6/5/2018 8/29/2018 8/29/2018

IF LOANED, IT IS SUBJECT TO RETURN

CONTRACT

UPON DEMAND AND MAY NOT BE USED

SIZE

IN ANY WAY DIRECTLY OR INDIRECTLY

MATL

DETRIMENTAL TO THE COMPANY.

A

FINISH

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