APG MPX-E Operating Manual

APG

MPX Magnetostrictive Level Sensors

User Manual

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

R

Doc #9003761
Rev F, 06/2017

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

Electrical Connections and System Wiring Diagrams ........................................................ 8-9

Chapter 2: Installation and Removal Procedures and Notes ............................ 10

Tools Needed ................................................................................................................................... 10

Physical Installation Notes ......................................................................................................... 10

Physical Installation Instructions ..............................................................................................11

Electrical Installation ....................................................................................................................11

Removal Instructions ................................................................................................................... 12

Chapter 3: Programming ..........................................................................................12

Modbus Programming .................................................................................................................. 12

Modbus Programming with RST-6001 and APG Modbus Software .................................... 13

4-20 mA Programming with RST-4100 and APG Modbus Software .................................... 13

Modbus Register Lists For MPX-E/R4 .................................................................................. 13-14

MPX-E/R4 Modbus Sensor Parameters ................................................................................ 15-19

APG Modbus Register Lists for MPX-E/R2 and MPX-E/R3 ............................................. 19-20

MPX-E/R2 and MPX-E/R3 APG Modbus Sensor Parameters ...........................................21-25

MPX-E/R Modbus Application Type Parameters .............................................................. 26-30

Chapter 4: Maintenance ........................................................................................... 31

General Care .................................................................................................................................... 31

Repair and Returns ........................................................................................................................ 31

Chapter 5: Hazardous Location Installation and Certication .........................32

Hazardous Location and Non-Incendive Wiring Diagram .................................................... 32

CSA Certicate of Compliance .............................................................................................. 33-36

ii

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Introduction

237484

Thank you for purchasing an MPX series magnetostrictive level sensor from APG. We appreciate your
business and your trust. Please take a few minutes to familiarize yourself with your MPX and this manual.

The MPX 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 hazardous areas in the US and Canada by CSA
for Class I, Division 1 & 2 and Class I, Zones 1 and 2 environments. The MPX-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 MPX-E allow it to be used in applications where space is limited.

The MPX-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.

Electrical ratings

Rated 12 - 24 VDC, 4-20 mA, or 80 mA

Class I, Division 1 & 2, Groups C, and D

Ex d IIB
Ex nA IIB

C

Class I, Zone 1; AEx d IIB
Class I, Zone 2; AEx na IIB

Non-Incendive Wiring Requirements: Vmax Ui= 28VDC, Imax Ii = 200ma, Ci = 0nF, Li = 0μH

US

 IMPORTANT: MPX level sensor MUST be installed according to drawing 9003468 (Haz-

ardous Installation and Non-Incendive Wiring Drawing) on page 32 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 -- OUVRIR LE CIRCUIT AVANT D’ENLEVER LE COUVERCLE, or GARDER LE COUVERCLE BIEN
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.

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iii

Warranty and Warranty Restrictions

This product is covered by APG’s waranty 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 recieve 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

• Dimensions

MPX-E Sensor and Float Dimensions

5.70”

3/4” NPT

5.00”

2.39”

S1

Dead-Band

(from Zero

Reference to

Float Ref.)

S2

Dead-Band

(from Float

Ref. to bottom

of stem)

4.25”

7.39”

Min. 12”

Max. 153”

ZERO
REFERENCE

GROUND
SCREW

2.00”

A & B

2.06”

E

5.00”

Float Options

1.38”

Float Ref.
S1=6”
S2=1.4”

Ø 0.27”

C & D

Float Ref.
S1=6”
S2=1.1”

1.63”

F

Float Ref.

1.87”

1.78”

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S1=6”
S2=2.27”

2.20”

Float Ref.
S1=6”
S2=1.5”

1.47”

1

MPX-E Chemical Sensor and Float Dimensions

5.70”

3/4” NPT

5.00”

2.13”

S1

Dead-Band

(from Zero

Reference to

Float Ref.)

4.25”

7.13”

5.00”

Ø 0.27”

ZERO
REFERENCE

Kynar Float

G

1.88”

Min. 12”

Max. 153”

1.91”

Float Ref.
S1=6”
S2=2.38”

S2

Dead-Band

(from Float

Ref. to bottom

of stem)

Note:

S2 increases to 2.88” if bottom float stop used.

 NOTE: For MPX-E Chemical with E4 output option, there is no ground screw on cou-

pler/NPT. Internal housing ground must be used for lightning protection.

2

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MPX-R Sensor and Float Dimensions

5.70”

3/4” NPT

5.00”

1.65”

S1

Dead-Band

(from Zero

Reference to

Float Ref.)

4.25”

6.65”

ZERO
REFERENCE

GROUND
SCREW

5.90”

U & V

5.00”

Float Options

Float Ref.
S1=10.63”
S2=6”

2.80”

Ø 0.27”

S & T

Float Ref.
S1=12.25”
S2=4.25”

3.07”

S2

Dead-Band

(from Float

Ref. to bottom

of stem)

Min. 48”

Max. 378”

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5.00”

3.03”

W & X

5.10”

Y & Z / P & R / L & M

5.50”

Float Ref.
S1=12.25”
S2=4.25”

3.08”

2.80”

2.00”

Float
Ref.
S1=10”
S2=6.5”

Y & Z
P & R
L & M

3

• Specications

Performance

Resolution 4-20 mA: 14 bit DAC
Modbus: 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 MPX-E Chem: 30 PSIA @ 70° F (21° C)

Electrical

Supply Voltage 12-24 VDC on sensor
Current Draw Modbus (RS-485): 25 mA (MPX-E)
28 mA (MPX-R)
4-20 mA: 22 mA single / 44 mA dual (Max)

Materials of Construction

Housing Cast aluminum, epoxy coated
Stem MPX-E: 0.5” Ø 316L SS

MPX-E Chemical: 0.5” Ø 316L SS with chemical

resistant coating

MPX-R: 1” Ø 316L SS
Mounting (slide) 316L SS
Compression Fitting (slide) Aluminum with Neoprene bushing

Connectivity

Output Modbus RTU (RS-485)
2 wire, loop-powered 4-20 mA
3 wire, loop-powered dual 4-20 mA

Programming

RS-485 Optional RST-6001 USB-to-RS-485 converter
4-20 mA Optional RST-4100 programming module

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• Model Number Congurator

Model Number: MPX - _E_ _____ _____ - _____ _____ - _____ _____ _____ _____ - _____ - _____ _____ - ______
A B C D E F G H I J K L N

A. Stem Type

□ E 0.5 in. diameter 316L SS

B. Output

2 Single oat, 4-20 mA (loop powered, 2 wire)

□
□ 3 Dual oat, 4-20 mA (loop powered, 3 wire)
□ 4 Modbus RTU, surge/lightning protection

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)

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. 12 in. - Max. 153 in.

K. End Plug Options

▲

□ __

0.5 in. Stem, Standard

□ 1 0.5 in. Stem, Keyhole for Cotter Pin

L. Float Stop Options

▲

□ __

0.5 in. Stem, 316L SS, 1 piece, 0.75 in. OD

□ A 0.5 in. Stem, 316L SS, 1 piece, 1.5 in. OD

N. Optional Temperature Sensor

MPX-E4

□ T__ RTD in stem, with location in inches from bottom of

probe (default is 6”)

F. Mounting Type

□ F Flat 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
□ O Other

▲

This option is standard

N. 4-20 Output Set Points

MPX-E2/E3

□ A__ 4mA set point location, in inches from bottom of probe
□ B__ 20mA set point location, in inches from top of probe

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5

Model Number: MPX - _E_ _____ _____ - __G__ __N__ - __P__ __2__ __W__ __D__ - _____ - __4__ _____ - ______
A B C D E F G H I J K L N

A. Stem Type

□ E 0.5 in. diameter 316L SS

B. Output

2 Single oat, 4-20 mA (loop powered, 2 wire)

□
□ 4 Modbus RTU, surge/lightning protection

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#

H. Mounting Connection

□ W Welded (xed)

I. Stem Material

□ D 316L SS with chemical resistant coating

J. Total Stem Length in Inches

□ __ Min. 12 in. - Max. 153 in.

K. End Plug Options

□ 4 0.5 in. Stem, chemical resistant coating on 316L SS

L. Float Stop Options

▲

□ F

Top Stop only, 1 piece, 0.5 in. Stem, Kynar

□ G Bottom Stop only, 1 piece, 0.5 in. Stem, Kynar
□ H Top & Bottom Stops, (2) 1 piece, 0.5 in. Stem, Kynar
□ N No Float Stops

N. Optional Temperature Sensor

MPX-E4

□ T__ RTD in stem, with location in inches from bottom of

probe (default is 6”)

G. Mounting Size

□ 2 Size 2

▲

This option is standard

N. 4-20 Output Set Points

MPX-E2

□ A__ 4mA set point location, in inches from bottom of probe
□ B__ 20mA set point location, in inches from top of probe

6

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Model Number: MPX - _R_ _____ _____ - _____ _____ - _____ _____ _____ _B_ - _____ - _____ _____ - ______
A B C D E F G H I J K L N

A. Stem Type

□ R 1 in. diameter 316L SS

B. Output

2 Single oat, 4-20 mA (loop powered, 2 wire)

□
□ 3 Dual oat, 4-20 mA (loop powered, 3 wire)
□ 4 Modbus RTU, surge/lightning protection, stem RTD

temperature sensor

Note: stem RTD is located 6” from bottom of probe

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)
□ R 5.5h x 2.8d in. Red Polyurethane (0.59 SG)
□ P 5.5h x 2.8d 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)
□ N None
□ O Other

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)
□ P 5.5h x 2.8d in. Blue Polyurethane (0.94 SG)
□ L 5.5h x 2d in. Blue Polyurethane (0.94 SG)
□ O Other

F. Mounting Type

□ F Flat 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
□ O Other

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. 378 in.

K. End Plug Options

▲

□ __

1 in. Stem, Standard

□ 2 1 in. Stem, Keyhole for Cotter Pin
□ 3 1 in. Stem, 3/8-16 x .6” L Threads

L. Float Stop Options

▲

□ __

1 in. Stem, 316L SS, 1 piece, 1.5 in. OD

□ C 1 in. Stem, 316L SS, 2 piece, 1.75 in. OD
□ D 1 in. Stem, Titanium 2, 1 piece, 1.5 in. OD

N. 4-20 Output Set Points

MPX-R2/R3

□ A__ 4mA set point location, in inches from bottom of probe
□ B__ 20mA set point location, in inches from top of probe

▲

This option is standard

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7

• Electrical Connections and System Wiring Diagrams

Modbus System Wiring For MPX-E4, MPX-R4 Sensors

Power
Supply

Master
Device

+12-24 Vdc

GND

RS-485 A

RS-485 B

Use Shielded Cable

120 Ω

terminating
resistor

Note: Earth Ground terminal is factory
connected to internal housing ground
lug.

MPX-E4, -R4
series sensor

Sensor 1

V+

B
A

GND

EARTH

GND

MPX-E4, -R4
series sensor

Sensor 2

V+

B
A

GND

EARTH

GND

Modbus System Wiring with RST-6001 For MPX-E4, MPX-R4 Sensors

Power
Supply

+12-24 Vdc

GND

Use Shielded Cable

MPX-E4, -R4
series sensor

Sensor 3

V+

B
A

GND

EARTH

GND

120 Ω

terminating
resistor at
last sensor

RST-6001

Modbus

Controller

USB to computer
with APG Modbus
software

Note: An independent +12-24 Vdc
power supply is required when
using an RST-6001 Modbus Controller.
The RST-6001 can only supply ±5 Vdc,
not the +12-24 Vdc required by the MPX.

Note: Earth Ground terminal is factory
connected to internal housing ground lug.

IMPORTANT: Refer to Chapter 5 for Hazardous Location and Non-Incendive Wiring



A
B

-5V

+5V

Equivalent 120 Ω

terminating resistor
internal to RST-6001

MPX-E4, -R4
series sensor

Sensor 1

V+

B
A

GND

EARTH

GND

MPX-E4, -R4
series sensor

Sensor 2

V+

B
A

GND

EARTH

GND

MPX-E4, -R4
series sensor

Sensor 3

V+

B
A

GND

EARTH

GND

diagram.

 IMPORTANT: For lightning and surge protection on MPX-E4 or -R4, either connect the

grounding screw (see pages 1-3) to an earth ground, or ensure that the tank mounting of
the MPX is grounded.

120 Ω

terminating
resistor at
last sensor

8

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4-20 mA Loop Wiring

4-20 mA Dual Float Loop Wiring

4-20 mA Single Float Loop Wiring

(MPX-E2 and MPX-R2 Series)

+

Sensor

12-24 Vdc

Out

Power Source

(12-24 Vdc)

Receiver

Input Com

 IMPORTANT: Refer to Chapter 5

for Hazardous Location and Non-In­cendive Wiring diagram.

4-20 mA Programming Wiring

(MPX-E3 and MPX-R3 Series)

−

−

Sensor

12-24 Vdc

Out 1
Out 2

+

Power Source

(12-24 Vdc)

Receiver

Input 1 Input 2 Com

OR

−

+

Sensor

12-24 Vdc

Out 1
Out 2

Power Source

Receiver 1

Input Com

(12-24 Vdc)

Receiver 2

Input Com

Programming configuration is

for programming ONLY. After
programming, sensor must be
reintegrated to 4-20 mA loop
for proper system operation.

RST-4100

MPX-E2, -R2 or
MPX-E3, -R3 series
sensor.

Sensor

12-24 Vdc

Out (1)

Out 2

Out 24V

Load Resistor

(150 Ω to 700 Ω)

Wired in series for

programming.

USB to computer
with APG Modbus
software

Programming Module
and APG Modbus software
required for programming
MPX-E2, -R2 and MPX-E3,

-R3 series sensors.

Note: a minimum of
14 Vdc is required to
establish communications
with the RST-4100

+

Power

Source

(14- 24 Vdc)

−

 NOTE: For MPX-E3 & MPX-R3 se-

ries sensors, - Vdc from power source
must be connected to Output1 on
sensor for correct sensor program­ming.

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9