APG MPI-E User manual

APG
R
Doc #9005622
Part #200336
Rev B, 06/2022
MPI Magnetostrictive Level Sensors
User Manual
For The MPI-E, MPI-E Chemical, and MPI-R
Intrinsically Safe

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Table of Contents
Introduction ................................................................................................................ iii
Warranty and Warranty Restrictions.................................................................... iv
Chapter 1: Specications and Options..................................................................... 1
Dimensions ....................................................................................................................................1-3
Specications ................................................................................................................................... 4
MPI-E Model Number Congurator............................................................................................. 5
MPI-E Chemical Model Number Congurator........................................................................... 6
MPI-R Model Number Congurator............................................................................................. 7
System Wiring Diagrams and IS Use Case Diagrams .......................................................... 8-9
Chapter 2: Installation and Removal Procedures and Notes............................ 10
Tools Needed................................................................................................................................... 10
ATEX Stated Conditions of Use................................................................................................... 10
Physical Installation Notes ......................................................................................................... 10
Physical Installation Instructions ..............................................................................................11
Electrical Installation ................................................................................................................... 12
Loss of Signal Indication.............................................................................................................. 12
Removal Instructions ................................................................................................................... 12
Chapter 3: Programming .......................................................................................... 13
Modbus Programming .................................................................................................................. 13
Modbus Programming with RST-6001 and APG Modbus Software .................................... 13
Modbus Register Lists For MPI-E/R .....................................................................................13-14
MPI-E/R Modbus Sensor Parameters...................................................................................15-19
MPI-E/R Modbus Application Type Parameters...............................................................20-24
Chapter 4: Maintenance ...........................................................................................25
General Care.................................................................................................................................... 25
Repair and Returns........................................................................................................................ 25
Chapter 5: Hazardous Location Installation and Certication.........................26
Intrinsically Safe Installation Drawing for Hazardous Locations ......................................26
CSA Certicate of Compliance.............................................................................................. 27-30
IECEX Certicate of Conformity............................................................................................31-34

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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 certied 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-R’s large, buoyant, and robust oats allow it to be used in harsh applications where
fouling or buildup might otherwise be of concern. The smaller, lighter weight oats of the MPI-E allow it
to be used in applications where space is limited. The MPI-E Chemical has a chemical resistant coating,
allowing for use in corrosive, acidic, and marine environments.
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 Certicate of Compliance at
the back of this manual for further details.
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:
U
i= 28 VDC, Ii = 280 mA, Pi = 0.850 W , Li = 3.50 μH, Ci = 0.374 μF
ATEX Certicate Number: Sira 19ATEX2072X
II 1G
Ex ia IIB T4 Ga
Ta: -40°C to 85°C
U
i= 28 V, Ii= 280 mA, Pi= 0.850 W, Li = 3.50 μH, Ci = 0.374 μF
IECEx SIR 19.0026X
Ex ia IIB T4 Ga
Ta: -40°C to 85°C
US
C
237484

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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.
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.
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.
IMPORTANT: MPI level sensor MUST be installed according to drawing 9005491
(Intrinsically Safe Installation Drawing for Hazardous Locations) on page 26 to meet listed
approvals. Faulty installation will invalidate all safety approvals and ratings.
IMPORTANT: Only the combustion gas detection performance of the instrument has
been tested.

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Chapter 1: Specications and Options
MPI-E Sensor and Float Dimensions
• Dimensions
4.21”
3.74”
7.32-7.44”
6.53-6.65”
5.00”
4.25”
5.71”
4.92”
S1
Dead-Band
(from Zero
Reference to
Float Ref.)
S2
Dead-Band
(from Float
Ref. to bottom
of stem)
3/4” NPT
1/2” NPT
2.38”
4.94”
4.15”
ZERO
REFERENCE
Min. 12”
Max. 153”
GROUND
SCREW
Ø 0.27”
3/4” NPT
1/2” NPT
Housing
Connection
Location
1.91”
1.88”
G
Float Ref.
S1=6”
S2=2.38”
Note:
For dual dimensions, large
housing dimensions are
above small housing
dimensions.
Float Options
2.00”
2.06”
A & B
Float Ref.
S1=6”
S2=1.4”
1.38”
1.63”
C & D
2.20”
1.47”
F
1.87”
1.78”
E
Float Ref.
S1=6”
S2=1.1”
Float Ref.
S1=6”
S2=2.27”
Float Ref.
S1=6”
S2=1.5”

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MPI-E Chemical Sensor and Float Dimensions
4.21”
3.74”
7.07”
6.28”
5.00”
4.25”
5.71”
4.92”
Kynar Float
S1
Dead-Band
(from Zero
Reference to
Float Ref.)
S2
Dead-Band
(from Float
Ref. to bottom
of stem)
3/4” NPT
2.13”
4.94”
4.15”
ZERO
REFERENCE
Min. 12”
Max. 153”
1.91”
1.88”
G
Float Ref.
S1=6”
S2=2.38”
Note:
S2 increases to 2.88” if bottom float stop used.
Ø 0.27”
3/4” NPT
Housing
Connection
Location
Note:
For dual dimensions, large
housing dimensions are
above small housing
dimensions.

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MPI-R Sensor and Float Dimensions
5.00”
4.25”
5.71”
4.92”
5.00”
5.10”
5.88”4.98”
3.03”
3.00”
5.50”
3.08”
2.80”
3.07”
Float Ref.
S1=10.63”
S2=6”
Float Ref.
S1=12.25”
S2=4.25”
Float Ref.
S1=12.25”
S2=4.25”
Float Options
Y & Z / L & M
W & X
S & T
U & V / I & J
I & J U & V
4.21”
3.74”
6.84” - 6.97”
6.05” - 6.18”
S1
Dead-Band
(from Zero
Reference to
Float Ref.)
S2
Dead-Band
(from Float
Ref. to bottom
of stem)
Float
Ref.
S1=10”
S2=6.5”
3/4” NPT
1/2” NPT
1.90”
4.94”
4.15”
2.00”
Y & Z
L & M
U & V
I & J
Min. 48”
Max. 300”
ZERO
REFERENCE
GROUND
SCREW
Ø 0.27”
3/4” NPT
1/2” NPT
Housing
Connection
Location
Note:
For dual dimensions, large
housing dimensions are
above small housing
dimensions.

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Performance
Resolution 0.04 in. (1 mm)
Accuracy ±0.04 in. (±1 mm)
Digital Temp Sensor Accuracy ±1°C
Environmental
Operating Temperature -40° to 185° F (-40° to 85° C)
Enclosure Protection NEMA 4X, IP65
Maximum Operating Pressure MPI-E Chem: 30 PSIA @ 70° F (21° C)
Electrical
Supply Voltage 8-24 VDC on sensor
Typical Current Draw 24 mA (MPI-E)
25 mA (MPI-R)
Protection Reverse Polarity and Surge (per IEC 61000-4-5, 4-6, 4-7)
Materials of Construction
Housing Cast aluminum, epoxy coated
Stem MPI-E: 0.5” Ø 316L SS
MPI-E Chemical: 0.5” Ø 316L SS with chemical
resistant coating
MPI-R: 1” Ø 316L SS
Mounting (slide) 316L SS
Compression Fitting (slide) Aluminum with Neoprene bushing
Connectivity
Output Modbus RTU (RS-485)
Programming
RS-485 Optional RST-6001 USB-to-RS-485 converter
• Specications

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• MPI-E Model Number Congurator
Model Number: MPI - _E_ __5__ _____ - _____ _____ - _____ _____ _____ __B__ - _____ - _____ - _____
A B C D E F G H I J K L
A. Stem Type
□E 0.5 in. diameter, rigid
B. Output
□5 Modbus RTU, with surge protection, Intrinsically Safe
C. Housing Type
All Housing Die-cast Aluminum, NEMA 4X, IP65, Blue
□__ Large Housing
□A▲ Small Housing
D. Float 1 (Top Float)
□A 316L SS Round (0.65 SG)
□B 316L SS Round (0.92 SG)
□C 316L SS Cylindrical (0.65 SG)
□D 316L SS Cylindrical (0.92 SG)
□E Buna-N (0.5 SG)
□F 316 SS 3A Cylindrical (0.5 SG)
□G Kynar Cylindrical (0.66 SG)
E. Float 2 (optional)
□N None
□B 316L SS Round (0.92 SG)†
F. Mounting Type
□P▲ NPT Plug 150#
□N None
G. Mounting Size
□1.5 1.5 in. (welded or slide connection)
□2▲ 2 in. (welded or slide connection)
□3 3 in. (slide connection)
□N None
H. Mounting Connection
□W Welded (xed)
□S Slide with Compression Fitting (adjustable)
I. Stem Finish Material
□B 316L SS
J. Total Stem Length in Inches
□__ Min. 12 in. - Max. 153 in.
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: †Must be used with Top Float A.
Note: ††Connectors available for use with Small Housing only.
For Large Housing, choose N None.

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Model Number: MPI - _E_ __5__ _____ - __G__ __N__ - __P__ __2__ __W__ __E__ - _____ - _____ - _____
A B C D E F G H I J K L
A. Stem Type
□E 0.5 in. diameter, rigid
B. Output
□5 Modbus RTU, with surge protection, Intrinsically Safe
C. Housing Type
All Housing Die-cast Aluminum, NEMA 4X, IP65, Blue
□__ Large Housing
□A▲ Small Housing
D. Float 1
□G Kynar Cylindrical (0.66 SG)
E. Float 2
□N None
F. Mounting Type
□P NPT Plug 150#
G. Mounting Size
□2 Size 2
H. Mounting Connection
□W Welded (xed)
I. Stem Finish Material
□E ETFE Fluon Coating
J. Total Stem Length in Inches
□__ Min. 12 in. - Max. 153 in.
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.

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Model Number: MPI - _R_ __5__ _____ - _____ _____ - _____ _____ _____ __B__ - _____ - _____ - _____
A B C D E F G H I J K L
A. Stem Type
□R 1 in. diameter, rigid
B. Output
□5 Modbus RTU, with surge protection, Intrinsically Safe
C. Housing Type
All Housing Die-cast Aluminum, NEMA 4X, IP65, Blue
□__▲ Large Housing
□A Small Housing
D. Float 1 (Top Float)
□Z/Y 5.5h x 3d in. Red Polyurethane (0.65 SG / 0.94 SG)
□X/W 5 in. Round 316L SS (0.52 SG / 0.92 SG)
□V/U 6h x 3d in. Oval 316L SS (0.58 SG / 0.94 SG)
□T/S 3 in. Round 316L SS (0.60 SG / 0.94 SG)
□M/L 5.5h x 2d in. Red Polyurethane (0.57 SG / 0.94 SG)
□J/I 5h x 3d in. Oval Titanium 2 (0.60 SG / 0.94 SG)
□N None
E. Float 2 (optional)
□N None
□Y 5.5h x 3d in. Blue Polyurethane (0.94 SG)
□W 5 in. Round 316L SS (0.92 SG)
□U 6h x 3d in. Oval 316L SS (0.94 SG)
□S 3 in. Round 316L SS (0.94 SG)
□L 5.5h x 2d in. Blue Polyurethane (0.94 SG)
□I 5h x 3d in. Oval Titanium 2 (0.94 SG)
F. Mounting Type
□P▲ NPT Plug 150#
□N None
G. Mounting Size
□2▲ 2 in. (welded or slide connection)
□3 3 in. (slide connection)
□N None
H. Mounting Connection
□W Welded (xed)
□S Slide with Compression Fitting (adjustable)
I. Stem Material
□B 316L SS
J. Total Stem Length in Inches
□__ Min. 48 in. - Max. 378 in.
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.

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• System Wiring Diagrams and IS Use Case Diagrams
IMPORTANT: Refer to Chapter 5 for Intrinsically Safe Installation Drawing for Hazard-
ous Locations.
Modbus System Intrinsically Safe Wiring For MPI-E5, MPI-R5 Sensors
Modbus System Intrinsically Safe Wiring with RST-6001 For MPI-E5, MPI-R5 Sensors
Power
Supply
+8-24 Vdc
GND Use Shielded Cable
120 Ω terminating resistor
may be necessary for long
cable runs.
V+
B (TX-)
A (TX+)
Sensor 1
GND
V+
B (TX-)
A (TX+)
Sensor 2
GND
V+
B (TX-)
A (TX+)
Sensor 3
GND
Server
Device
RS-485 A (TX+)
RS-485 B (TX-)
MPI Sensor MPI Sensor MPI Sensor
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.
120 Ω terminating resistor across A & B
terminals of last or only sensor, if necessary.
For installations without IS barriers only.
Wiring T’s must be located on
controller/supply side of IS barriers.
See Hazardous Installation
Drawing for Intrinsically Safe
installation requirements.
Otherwise, wire directly.
See Hazardous Installation
Drawing for Intrinsically Safe
installation requirements.
Otherwise, wire directly.
See Hazardous Installation
Drawing for Intrinsically Safe
installation requirements.
Otherwise, wire directly.
Power
Supply
+8-24 Vdc
GND Use Shielded Cable
Equivalent 120 Ω
terminating resistor
internal to RST-6001
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
MPI sensor
+5V
MPI sensor MPI sensor
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.
Wiring T’s must be located on
controller/supply side of IS barriers.
120 Ω terminating resistor across A & B
terminals of last or only sensor, if necessary.
For installations without IS barriers only.
See Hazardous Installation
Drawing for Intrinsically Safe
installation requirements.
Otherwise, wire directly.
See Hazardous Installation
Drawing for Intrinsically Safe
installation requirements.
Otherwise, wire directly.
See Hazardous Installation
Drawing for Intrinsically Safe
installation requirements.
Otherwise, wire directly.

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MPI - MDI Use Case Diagram
MDI
Modbus Address: Server
Controling: Sensor 1
MPI Sensor
Modbus Address: 1
Hazardous Area
Zone 1
Zone 0 or Zone 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
MDI
Modbus Address: Server
Controling: Sensor 1
MPI Sensor
Modbus Address: 1
Hazardous AreaNon-hazardous Area
Approved
IS Barrier
Passive Control Equipment
Modbus: Sniffer
Sniffing: MDI
Zone 1
Zone 0 or Zone 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 (Snis) 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
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
• Channellock pliers for tightening compression tting
• 3/32” hex Allen wrench for 1-piece MPI-E oat stops
• 1/8” hex Allen wrench for 1-piece MPI-R oat stops
• 3/16” hex Allen wrench for 2-piece MPI-R oat stops
• Tools Needed
The MPI 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 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 elds, such as those produced by motors, transform-
ers, solenoid valves, etc.
• The medium is free from metallic substances and other foreign matter.
• The probe is not exposed to excessive vibration.
• The oat(s) t through the mounting hole. If the oat(s) does/do not t, it/they must be mounted on
the stem from inside the vessel being monitored.
• The oat(s) is/are oriented properly on the stem (See Figure 2.1). MPI-E oats will be installed by the
factory. MPI-R oats are typically installed by customer.
• Physical Installation Notes
• 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.
• ATEX Stated Conditions of Use

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NOTE: For MPI-E Chemical sensors: Chemical resitant coating will scar and expose
stainless steel if scraped or abused. Use caution when handling. Always transport in pack-
aging to protect probe and coating.
Figure 2.1
UP
Taper IMPORTANT: Floats must be oriented proper-
ly on the stem, or sensor readings will be inaccu-
rate and unreliable. Untapered oats will have a
sticker or etching indicating the top of the oat.
Remove sticker prior to use.
IMPORTANT: MPI level sensor MUST be installed according to drawing 9005491
(Intrinsically Safe Installation Drawing for Hazardous Locations) on page 26, to meet listed
approvals. Faulty installation will invalidate all safety approvals and ratings.
• 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 exible stem in-between. Sharp bends at those points could
damage the sensor. (Not applicable for non-exible probe stems.)
• If your sensor’s stem and oats t through the mounting hole, carefully lower the assembly into the
vessel, then secure the sensor’s mounting option to the vessel.
• If the oats do not t, mount them on the stem from inside the vessel being monitored. Then secure
the sensor to the vessel.
• For sensors with oat stops, refer to the assembly drawing included with the sensor for oat stop
installation locations.
• For MPI-E Chemical, ensure probe is concentric with tting so as not to scrape chemical resistant coat-
ing o against threads of tting.
• Physical Installation Instructions

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Loss of Signal occurs when the return signal from a oat is not detected by the sensor. This condition is in-
dicated by specic readouts in Raw Top Float Reading and Raw Bottom Float Reading (Input Registers 30300
and 30301, respectively. See page 13).
• For bottom oat Loss of Signal: Raw Bottom Float Reading (Input Register 30301) will read 32768
• For top oat Loss of Signal: Raw Top Float Reading and Raw Bottom Float Reading (Input Registers
30300 and 30301, respectively) will both read 32768.
• Loss of Signal Indication
• 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 8-9) for Modbus wiring examples.
• Electrical Installation
Removing your MPI level sensor from service should be done with care.
• If the oats on your sensor t through the mounting hole, carefully lift the entire sensor assembly out
of and away from the vessel.
• If the oats on your sensor do not t 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 ac-
cess to the oats and stem for removal.
• Clean the stem and oats 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.
• Removal Instructions

13
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MPI-E/R 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-E/R Modbus Register Lists on pages 13 and 14.
Chapter 3: Programming
• Modbus Programming
NOTE: For more information about Modbus RTU, please visit www.modbus.org.
An APG RST-6001 Modbus Controller can be used in tandem with APG Modbus to program and control up
to 20 MPI-E/R series sensors. Through APG Modbus, you can monitor the raw readings from the sensor,
congure the data for distance, level, volume, or weight, and enter measurements for a strapping chart. See
MPI-E/R Modbus Register Lists on pages 13 and 14.
• Modbus Programming with RST-6001 and APG Modbus Software
NOTE: For APG Modbus programming instructions, or to download APG Modbus soft-
ware, please visit www.apgsensors.com/suppport.
• Modbus Register Lists for MPI-E/R
Input Registers (0x04)
Register Returned Data
30299 Model Type
30300 Raw Top Float Reading (in mm, unsigned)
30301 Raw Bottom Float Reading (in mm, unsigned)
30302 Temperature Reading (in 0C, signed)
30303-30304 Calculated Top Float Reading (in selected Units)
30305-30306 Calculated Bottom Float Reading (in selected Units)
30307 Version
30308 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 Function Value Range
40400 Device Address 1 to 247
40401 Units 1, 2, 3
40402 Application Type 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11
40403 Volume Units 1, 2, 3, 4, 5, 6, 7
40404 Decimal Place 0, 1, 2, 3
40405 †Max Distance 0 to 32,768 mm
40406 Full Distance 0 to 32,768 mm
40407 Empty Distance 0 to 32,768 mm
40408 †Sensitivity 0 to 100
40409 †Pulses 5 to 20
40410 †Blanking 0 to 10,364 mm
40411 NA NA
40412 Averaging 1 to 50
40413 Filter Window 0 to 10,364 mm
40414 Out of Range Samples 1 to 255
40415 Sample Rate 50 to 1,000 msec.
40416 †Multiplier 1 to 1,999 (1000 = 1.000)
40417 †Oset -10,364 to 10,364 mm
40418 †Pre lter 0 to 10,364 mm
40419 †Noise limit 0 to 255
40420 Temperature Select 0 to 8
40421 RTD Oset (0C) NA*
40422 †Float Window 0 to 1,000 mm 0=1 oat
40423 1st Float Oset -10,364 to 10,364
40424 2nd Float Oset -10,364 to 10,364
40425 †Gain Oset 0 to 255
40426 4 mA Set Point NA*
40427 20 mA Set Point NA*
40428 4 mA Calibration NA*
40429 20 mA Calibration NA*
40430 t1d NA*
40431 t1w NA*
40432 t1t NA*
40433 t2d NA*
40434 t2w NA*
40435 t2t NA*
40436-40437 Parameter 1 Data 0 to 1,000,000 mm
40438-40439 Parameter 2 Data 0 to 1,000,000 mm
40440-40441 Parameter 3 Data 0 to 1,000,000 mm
40442-40443 Parameter 4 Data 0 to 1,000,000 mm
40444-40445 Parameter 5 Data 0 to 1,000,000 mm
40446 Baud Rate 0, 1, 2, 3, 4
40201 Restore to Factory Defaults 1
*These registers are not used by the MPI-E/R, even though they are labeled in the APG Modbus software.
†Setting is factory calibrated. Do not adjust.

15
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• MPI-E/R 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-E/R Modbus Application Type Parameters pages 20-24.
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
oat signals, usually the bottom of the stem. A oat beyond the Maximum Distance value will not be detect-
ed.
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 oat 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 rst signal will be valid. Signals from a oat in the blanking area will be ignored.
40412 - Averaging
Sets the number of qualied received oat signals to average for the raw reading. Qualied received signals
are placed in a rst-in, rst-out buer, the contents of which are averaged for the raw reading. The larger
the number of qualied received signals being averaged, the smoother the reading will be, and the slower
the reading will be to react to quickly changing targets.