APG MPI-F Operating Manual

APG

MPI Magnetostrictive Level Sensors

User Manual

For the Series MPI-F

Flexible Stem, Intrinsically Safe Probe

Doc #9005623

R

Part #200337

Rev A, 12/2019

Table of Contents

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

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

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

Dimensions ....................................................................................................................................1-2

Specications ...................................................................................................................................3

Model Number Congurator .......................................................................................................... 4

System Wiring Diagrams and IS Use Case Diagrams .......................................................... 5-6

Chapter 2: Installation and Removal Procedures and Notes ..............................7

Tools Needed .....................................................................................................................................7

ATEX Stated Conditions of Use .....................................................................................................7

Physical Installation Notes ...........................................................................................................7

Physical Installation Instructions ............................................................................................... 8

Electrical Installation .....................................................................................................................9

Removal Instructions .....................................................................................................................9

Chapter 3: Programming ..........................................................................................10

Modbus Programming .................................................................................................................. 10

Modbus Programming with RST-6001 and APG Modbus Software .................................... 10

Modbus Register Lists for MPI-F .......................................................................................... 10-11

MPI-F Modbus Sensor Parameters ....................................................................................... 12-16

MPI-F Modbus Application Type Parameters .................................................................... 17-21

Chapter 4: Maintenance ...........................................................................................22

General Care .................................................................................................................................... 22

Repair and Returns ........................................................................................................................22

Chapter 5: Hazardous Location Installation and Certication .........................23

Intrinsically Safe Installation Drawing for Hazardous Locations ......................................23

CSA Certicate of Compliance .............................................................................................. 24-26

IECEx Certicate of Conformity ...........................................................................................27-29

EU Declaration of Conformity .....................................................................................................30

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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 sensors provide highly accurate and repeatable level readings in a wide variety of liquid level

measurement applications. The MPI-F 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-F’s exible stainless

steel stem allows for easier installation in extra tall tanks.

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 CSA 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

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 IMPORTANT: MPI-F level sensor MUST be installed according to drawing 9009451

(Intrinsically Safe Installation Drawing for Hazardous Locations) on page 23 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.

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Chapter 1: Specications and Options

• Dimensions

MPI-F Sensor Dimensions

CONDUIT

OPENING

HOUSING

[110mm]

4.34"

[145mm]

5.71"

[126mm]

3/4" NPT

4.98"

[110mm]

4.34"

HOUSING

ADAPTER

[125mm]

[48mm]

[254mm]

10.0"

MEASURABLE LENGTH (PER ORDER)

[173.8mm - 177.0mm]

4.94"

1.90"

6.84" - 6.97"

2x Ø2.76"

THRU

GROUND

SCREW

TOP DEADBAND

MOUNTING OPTION FLOAT(S)

TOTAL LENGTH

Housing Connection

Location

MPI-F STEM

ASSEMBLY

FLOAT

STOP

BOT DEADBAND

[152mm]

6.0"

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1

MPI-F Floats

Float Options

I & J U & V

5.88”4.98”

W & X

5.00”

U & V / I & J

3.03”

3.00”

Float Ref.
S1=12.25”
S2=4.25”

5.10”

Float Ref.
S1=10.63”
S2=6”

U & V
I & J

S & T

2.80”

3.07”

Y & Z / L & M

5.50”

3.08”

2.00”

Float Ref.
S1=12.25”
S2=4.25”

Float
Ref.
S1=10”
S2=6.5”

Y & Z
L & M

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• Specications

Performance

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

Environmental

Operating Temperature -40° to 185° F (-40° to 85° C)

Enclosure Protection NEMA 4X, IP65

Electrical

Supply Voltage 8-24 VDC on sensor
Typical Current Draw 25 mA
Protection Reverse Polarity and Surge (per IEC 61000-4-5, 4-6, 4-7)

Materials of Construction

Housing Cast aluminum, epoxy coated

Stem 7/8” ø 316L SS Flexible Tubing with Braid
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

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• Model Number Congurator

Model Number: MPI - _F_ __5__ _____ - _____ _____ - _____ _____ _____ __B__ - _____ - _____ - _____
A B C D E F G H I J K L

A. Stem Type

□ F 7/8 in. diameter Flexible Tubing with Braid, 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. 120 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: 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.

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• System Wiring Diagrams and IS Use Case Diagrams

Modbus System Wiring For MPI-F 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.

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

Modbus System Wiring with RST-6001 For MPI-F Sensors

Power
Supply

+8-24 Vdc

GND

Use Shielded Cable

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.

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.

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

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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

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

Sensor 3

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.

5

MPI - MDI Use Case Diagram

Hazardous Area

Zone 1

MDI
Modbus Address: Master
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

Hazardous AreaNon-hazardous Area

Zone 1

MDI
Modbus Address: Master
Controling: Sensor 1

Zone 0 or Zone 1

Passive Control Equipment

Modbus: Sniffer

Approved
IS Barrier

Sniffing: MDI

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.

MPI Sensor
Modbus Address: 1

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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 tting

• 1/8” Hex Allen wrench for screws on oat stop(s).

• Pliers for bending cotter pin.

• 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-F 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)

• 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-F oats are installed by customer.

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