APG MPI-E Operating Manual

APG

MPI Magnetostrictive Level Sensors

User Manual

For The MPI-E, MPI-E Chemical, and MPI-R

Intrinsically Safe

Doc #9005622

R

Part #200336

Rev A, 12/2019

Table of Contents

Introduction ................................................................................................................ iii

Warranty and Warranty Restrictions .................................................................... iv

Chapter 1: Specications and Options.....................................................................1

Dimensions ....................................................................................................................................1-3

Specications ...................................................................................................................................4

Model Number Congurator .......................................................................................................5-7

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 ....................................................................................................................11

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 .............................................................................................. 27-29

IECEX Certicate of Conformity ........................................................................................... 30-32

EU Declaration of Conformity ..................................................................................................... 33

ii

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Introduction

237484

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 level sensor provides highly accurate and repeatable level readings in a wide variety of liquid level

measurement applications. It is certied intrinsically safe for installation in hazardous areas by CSA, ATEX,
and IECEx for Class I, Division 1 and Class I, Zones 0 environments. 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; IP65

Class I, Zone 0, Ex/AEX ia, IIB, T4, Ga
Ex ia IIB, T4 ,Ga
(Ta = -40°C to 85°C)

C

US

Intrinsically Safe Wiring Requirements:

U

ATEX Certicate Number: Sira 19ATEX2072X

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

U

IECEx SIR 19.0026X
Ex ia IIB T4 Ga
Ta: -40°C to 85°C

= 28 V, Ii = 280 mA, Pi = 0.850 W, L

i

= 28 VDC, Ii = 280 mA, Pi = 0.850 W , Li = 3.50 μH, Ci = 0.374 μF

i

= 3.50 μH, Ci = 0.374 μF

i

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iii

 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.

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 SUITABILITY

FOR CLASS I, DIVISION 2;
AVERTISSEMENT -- RISQUE D’EXPLOSION -- LA SUBSTITIOND E COMPOSANTSP EUTR ENDRE CE MATERIEL
INACCEPTABLE POUR LES EMPLACEMENTS DE CLASSE I, DIVISION 2.

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.

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.

iv

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Chapter 1: Specications and Options

5.71”

• Dimensions

MPI-E Sensor and Float Dimensions

3/4” NPT

4.94”

4.15”

2.38”

S1

Dead-Band

(from Zero

Reference to

Float Ref.)

4.21”

3.74”

7.32-7.44”

6.53-6.65”

Min. 12”

Max. 153”

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

ZERO
REFERENCE

GROUND
SCREW

A & B

2.00”

4.92”

5.00”

4.25”

Float Options

Float Ref.
S1=6”
S2=1.4”

1.38”

3/4” NPT
Housing
Connection
Location

Ø 0.27”

C & D

Float Ref.
S1=6”
S2=1.1”

S2

Dead-Band

(from Float

Ref. to bottom

of stem)

Float G Note:
S2 increases to 2.88” if

bottom float stop used.

2.06”

E

1.63”

Float Ref.

1.87”

F

S1=6”
S2=2.27”

G

1.78”

2.20”

Float Ref.
S1=6”

1.91”

S2=1.5”

1.47”

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1.88”

Float Ref.
S1=6”
S2=2.38”

1

MPI-E Chemical Sensor and Float Dimensions

5.71”

3/4” NPT

4.94”

4.15”

2.13”

S1

Dead-Band

(from Zero

Reference to

Float Ref.)

4.21”

3.74”

Note:

For dual dimensions, large
housing dimensions are
above small housing

dimensions.

7.07”

6.28”

ZERO
REFERENCE

4.92”

5.00”

4.25”

Kynar Float

G

1.88”

3/4” NPT

Housing

Connection
Location

Ø 0.27”

S2

Dead-Band

(from Float

Ref. to bottom

of stem)

Min. 12”

Max. 153”

Float Ref.

1.91”

S1=6”
S2=2.38”

Note:

S2 increases to 2.88” if bottom float stop used.

2

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MPI-R Sensor and Float Dimensions

5.71”

3/4” NPT

4.94”

1.90”

S1

Dead-Band

(from Zero

Reference to

Float Ref.)

4.21”

6.84” - 6.97”

ZERO
REFERENCE

GROUND
SCREW

I & J U & V

U & V / I & J

5.00”
3/4” NPT
Housing
Connection
Location

Ø 0.27”

Float Options

S & T

S2

Dead-Band

(from Float

Ref. to bottom

of stem)

Min. 48”

Max. 300”

5.00”

5.88”4.98”

3.03”

3.00”

W & X

Float Ref.
S1=10.63”
S2=6”

U & V
I & J

Float Ref.
S1=12.25”
S2=4.25”

2.80”

3.07”

Y & Z / L & M

5.50”

3.08”

Float Ref.
S1=12.25”
S2=4.25”

Float
Ref.
S1=10”
S2=6.5”

Y & Z

5.10”

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2.00”

L & M

3

• Specications

Performance

Resolution 0.04 in. (1 mm)
Accuracy ±0.05% of Full Scale or 1 mm (whichever is larger)

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

4

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• 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 316L SS

B. Output

□ 5 Modbus RTU, with surge protection, Intrinsically Safe

C. Housing Type

All Housing Die-cast Aluminum, NEMA 4X, IP68, Blue

□ __ Large Housing

▲

□ A

Small Housing

□ B Large Housing with window
□ C Small Housing with window

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)

E. Float 2 (optional)

□ N None
□ B 316L SS Round (0.92 SG)†
□ D 316L SS Cylindrical (0.92 SG)††

F. Mounting Type

□ F Flat Face ANSI Flange 150#

(Sizes: 2, 2.5, 3, 4, 5, 6)

□ R Raised Face ANSI Flange 150#

(Sizes: 2, 2.5, 3, 4, 5, 6)

□ S Tri Clamp

(Sizes: 2, 2.5, 3)

□ P NPT Plug 150#

(Sizes: 2, 2.5, 3, 4)

□ N None

G. Mounting Size

□ __ See Mounting Type for available sizes

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, with minimum of 2 in.

required between temperature sensors.

L. Housing Connection

▲

□ N

None

□ A 3/4” to 1/2” NPT Reducing Threads
□ B Cable Gland (Cable sold separately)
□ M 4-pin M12 Micro Connector Male
□ F 4-pin M12 Micro Connector Female

Note: ▲This option is standard.

Note: †Must be used with Top Float A.

Note: ††Must be used with Top Float C.

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5

Model Number: MPI - _E_ __5__ _____ - __G__ __N__ - __P__ __2__ __W__ _____ - _____ - _____ - _____
A B C D E F G H I J K L

A. Stem Type

□ E 0.5 in. diameter 316L SS

B. Output

□ 5 Modbus RTU, with surge protection, Intrinsically Safe

C. Housing Type

All Housing Die-cast Aluminum, NEMA 4X, IP68, Blue

□ __ Large Housing

▲

□ A

Small Housing

□ B Large Housing with window
□ C Small Housing with window

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

Note: ▲This option is standard.

H. Mounting Connection

□ W Welded (xed)

I. Stem Finish Material

□ F Kynar Coating
□ G Abcite 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, with minimum of 2 in.

required between temperature sensors.

L. Housing Connection

▲

□ N

None

□ A 3/4” to 1/2” NPT Reducing Threads
□ B Cable Gland (Cable sold separately)
□ M 4-pin M12 Micro Connector Male
□ F 4-pin M12 Micro Connector Female

6

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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 316L SS

B. Output

□ 5 Modbus RTU, with surge protection, Intrinsically Safe

C. Housing Type

All Housing Die-cast Aluminum, NEMA 4X, IP68, Blue

▲

□ __

Large Housing

□ B Large Housing with window

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)
□ X 5 in. Round 316L SS (0.52 SG)
□ W 5 in. Round 316L SS (0.92 SG)
□ V 6h x 3d in. Oval 316L SS (0.58 SG)
□ U 6h x 3d in. Oval 316L SS (0.94 SG)
□ T 3 in. Round 316L SS (0.60 SG)
□ S 3 in. Round 316L SS (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)
□ W 5 in. Round 316L SS (0.92 SG)
□ U 6h x 3d in. Oval 316L SS (0.94 SG)
□ L 5.5h x 2d in. Blue Polyurethane (0.94 SG)
□ I 5h x 3d in. Oval Titanium 2 (0.92 SG)

F. Mounting Type

□ F Flat Face ANSI Flange 150#

(Sizes: 2, 2.5, 3, 4, 5, 6)

□ R Raised Face ANSI Flange 150#

(Sizes: 2, 2.5, 3, 4, 5, 6)

□ S Tri Clamp

(Sizes: 2, 2.5, 3)

□ P NPT Plug 150#

(Sizes: 2, 2.5, 3, 4)

□ N None

G. Mounting Size

□ __ See Mounting Type for available sizes

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. 300 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: ▲This option is standard.

Note: Temperature sensors B - G are spaced evenly between

A and probe’s zero reference, with minimum of 2 in.

required between temperature sensors.

L. Housing Connection

▲

□ N

None

□ A 3/4” to 1/2” NPT Reducing Threads
□ B Cable Gland (Cable sold separately)
□ M 4-pin M12 Micro Connector Male
□ F 4-pin M12 Micro Connector Female

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7

• System Wiring Diagrams and IS Use Case Diagrams

Modbus System Intrinsically Safe Wiring For MPI-E5, MPI-R5 Sensors

Power
Supply

Master

Device

120 Ω terminating resistor
may be necessary for long

+8-24 Vdc

GND

RS-485 A (TX+)

RS-485 B (TX-)

Use Shielded Cable

See Hazardous Installation

Drawing for Intrinsically Safe
installation requirements.
Otherwise, wire directly.

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.

cable runs.

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

MPI Sensor MPI Sensor MPI Sensor

Sensor 1

V+

B (TX-)

A (TX+)

GND

Sensor 2

V+

B (TX-)

A (TX+)

GND

Sensor 3

V+

B (TX-)

A (TX+)

GND

120 Ω 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-E5, MPI-R5 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

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.

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



ous Locations.

A
B

-5V

+5V

Equivalent 120 Ω

terminating resistor
internal to RST-6001

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

MPI sensor

Sensor 1

V+

B
A

GND

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

MPI sensor MPI sensor

Sensor 2

V+

B
A

GND

120 Ω terminating resistor across A & B

terminals of last or only sensor, if necessary.

For installations without IS barriers only.

Sensor 3

V+

B
A

GND

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

8

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