Penberthy Level Control Switch, Model MGS-314/314D, Penberthy-EN Manuals & Guides

PENBERTHY MODEL MGS-314 SERIES AND MGS-314D SERIES LEVEL CONTROL SWITCH

INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS

Before installation, these instructions must be read carefully and understood.

TABLE OF CONTENTS

Product warranty ................................................ 1

1 Introduction ............................................. 1

2 Specifications/Approvals ......................... 2

2.1 Enclosure ..................................................... 2

2.2 Switch ........................................................... 2

2.3 Approvals ...................................................... 2

3 Theory of Operation ................................. 2

4 Installation ............................................... 2

4.1 Unpacking..................................................... 2

4.2 Mounting the switch .................................... 3

4.3 Wiring connection ........................................ 3

5 Set-up ...................................................... 4

5.1 Initial test ...................................................... 4

6 Pump-Control Set-up .............................. 4

6.1 Interval relay wiring ..................................... 4

7 Troubleshooting ...................................... 4

7.1 Introduction .................................................. 4

7.2 Switch test .................................................... 4

7.3 Actuation test ............................................... 4

8 Telephone Assistance .............................. 5

9 Model KFA5-SR2-Ex2.W.IR

Interval Relay .......................................... 9

9.1 Operation ...................................................... 9

9.2 Typical applications ..................................... 9

9.3 Connection diagram .................................... 9

Tables and Figures

Figure 1 - MGS-314 Series ................................ 3

Figure 2 - MGS-314D Series ............................. 3

Figure 3 - Control drawing CSA approved

explosion-proof for

MGS-314/314D (7E741-009) ............. 5

Figure 4 - Control drawing CSA approved

intrinsically safe for

MGS-314/314D (7E742-009) ............. 6

Figure 5 - Application 1-Pump-up diagram ..... 7

Figure 6 - Application 2-

Pump-down diagram ........................ 7

Figure 7 - Connection diagram ......................... 7

PRODUCT WARRANTY

Emerson warrants its Penberthy products
as designed and manufactured to be free of
defects in material and workmanship for a
period of one year after the date of installation
or eighteen months after date of manufacture,
whichever is earliest. Emerson will, at its
option, replace or repair any products which
fail during the warranty period due to defective
material or workmanship.

Prior to submitting any claim for warranty
service, the owner must submit proof of
purchase to Emerson and obtain written
authorization to return the product. Thereafter,
the product shall be returned to Emerson, with
freight prepaid.

This warranty shall not apply if the product has
been disassembled, tampered with, repaired
or altered outside of the Emerson factory, or
if it has been subjected to misuse, neglect
oraccident.

Emerson's responsibility hereunder is
limited to repairing or replacing the product
at its expense. Emerson shall not be liable
for loss, damage, or expenses directly or
indirectly related to the installation or use
of its products, or from any other cause or
for consequential damages. It is expressly
understood that Emerson is not responsible
for damage or injury caused to other products,
building, property or persons, by reason of the
installation or use of its products.

This is Emerson's sole warranty and in lieu of
all other warranties, expressed or implied which
are hereby excluded, including in particular all
warranties of merchantability or fitness for a
particular purpose.

This document and the warranty contained
herein may not be modified and no other
warranty, expressed or implied, shall be made
by or on behalf of Emerson unless modified or
made in writing and signed by the company's
president or a vice president.

1 INTRODUCTION

The instructions in this manual pertain to
the Penberthy Model MGS-314 or MGS-314D
Magnetic Level Meter Switch.
The Model MGS-314/314D Series Magnetic
Level Meter Switch is designed to detect the
passage of the float in a MULTIVIEW™ magnetic
liquid level meter, at a specific location. The
switch consists of a snap-action switch and
a magnetic actuation assembly encased
in a watertight (Type 4) or explosion-proof
(Type7)enclosure.

Emerson.com © 2019 Emerson. All Rights Reserved. VCIOM-03387-EN 22/07

PENBERTHY MODEL MGS-314 SERIES AND MGS-314D SERIES LEVEL CONTROL SWITCH

INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS

2 SPECIFICATIONS/APPROVALS

2.1 Enclosure

Watertight (Type 4) and explosion-proof (Type 7)
cast aluminum housing; Nitrile (NBR) O-ring

2.2 Switch
Output:

MGS-314 Series: SPDT (Form C) switch output:

125

5 amps at

/

250 Vac, non-inductive load

MGS-314D Series: DPDT (2x Form C) switch

125

output: 10 amps at
Repeatability: Better than

/

250 Vac, non-inductive load

1

/

32"

Response time: <100 milliseconds
Operating temperature:

-40 to 365°F (-40 to 185°C) - with third party
approvals (CSA)

-40 to 645°F (-40 to 340°C) - without third
party approvals
Ambient temperature range: -4 to 104°F
(-20 to 40°C)

Dead band: ± ½"

2.3 Approvals
Models: MGS-314-C/MGS-314D-C

CSA Approved Ex d

Explosion-proof for: Division 1, 2;
Class I; Groups B, C, D;
Class II; Groups E, F, G;
Class III; Type 4
When installed in accordance with control
drawing 7E741-009 (Figure 3)

CSA Approved Ex ia

Intrinsically safe for: Division 1, 2;
Class I; Groups A, B, C, D;
Class II; Groups E, F, G;
Class III; Type 4
When installed in accordance with control
drawing 7E742-009 (Figure 4)

3 THEORY OF OPERATION

While reading the theory of operation refer
to Figure 1 (MGS-314 Series) or Figure 2
(MGS-314D Series) for the location of the
components. The description is based on a
sideview.
With the liquid level below the switch, the
toggle magnet should be at position 'A'. It
is held in this position by an attractor near
the magnet at the bottom of the toggle. As
the float ascends and passes the switch,
thedraw between the float magnet and toggle
magnet is sufficient to overcome the attractor.
Consequently, the toggle moves to position
'B' and is held in place by a second attractor.
The movement of the toggle causes the switch
(orswitches) to change state.
As the float descends with the liquid level it
passes the switch and the process described is
reversed. The toggle returns to position 'A' and
the switch returns to its original state.

4 INSTALLATION

4.1 Unpacking

Upon receiving the Model MGS-314/314DSeries
Magnetic Level Meter Switch, check all
components carefully for damage incurred in
shipping. If damage is evident or suspected,
do not attempt installation. Flameproof joints
are not to be repaired. Notify the carrier
immediately and request a damage inspection.
Check each item against the packing list.

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PENBERTHY MODEL MGS-314 SERIES AND MGS-314D SERIES LEVEL CONTROL SWITCH

INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS

FIGURE 1
MGS-314 SERIES

Toggle Toggle

Position 'A' Position 'B'

FIGURE 2
MGS-314D SERIES

Toggle

Position 'A'

4.2 Mounting the switch

Due to shipping vibration, it is possible the
magnet toggle will not be in the 'normal'
position for proper operation. If this occurs,
simply cycle the float past the switch once.
Thiswill initialize it automatically.

1. Measure the distance from the top of the
indicating scale, on the magnetic level
meter, to the top of the communicating
chamber. Record this distance.

2. Loosen the clamps holding the indicating
scale to the communicating chamber.

3. Open the mounting band supplied with the
MGS-314/314D Series and put it around
the communicating chamber, under the
indicating scale.

4. Place the MGS-314/314D Series on
the communicating chamber with the
cooling fins facing 180° away from the
communicating chamber and with the
conduit opening facing down.

Toggle

Position 'B'

5. Put the mounting band between the cooling
fins in the channel provided.

6. Loosely tighten the mounting band. Move
the MGS-314/314D Series either up or down
to the desired position, and tighten the band.

7. The switch must be mounted within the
indication range for the magnetic gauge.
The mounting band for the switch should be
a minimum of 1" inside the indication range.
This will insure sufficient float movement to
operate the switch.

8. If more than one switch is used on a
single magnetic gauge, the minimum
recommended distance between mounting
bands is 3".

9. Adjust the position of the indicating scale so
that the distance from the top of the scale
to the top of the communicating chamber
is the same as in Step 1. Tighten the
clamps holding the indicating scale to the
communicating chamber.

4.3 Wiring connection

1.

If you are using conduit for the switch wiring
use a conduit seal with a drain or a drip-loop to
prevent condensate from entering the housing.
Condensate can cause electrical shorts.

The switch housing has a ½" NPT-F

connection for the wiring conduit.

2.

We recommend attaching an aluminum
condulet, via a 300 Series stainless steel
nipple, to the conduit opening of the switch
housing. This will give you an accessible point
to terminate the control wires. DO NOT USE
any ferromagnetic material such as: carbon
steel, duplex, 400 Series stainless steel or
castiron.

3

PENBERTHY MODEL MGS-314 SERIES AND MGS-314D SERIES LEVEL CONTROL SWITCH

INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS

5 SET-UP

DANGER!

Energizing the switch with the cover removed can cause ignition of flammable materials or
atmospheres, resulting in personal injury, death or property damage.
Do not apply power to the switch while performing these tests.

5.1 INITIAL TEST

Wire color

Model Toggle orientation

Toggle at position 'A'
MGS-314
Series

MGS-314D
Series

(liquid level below switch)

Toggle at position 'B'

(liquid level above switch)

Toggle at position 'A'

(liquid level below switch)

Toggle at position 'B'

(liquid level above switch)

Black Red Blue Orange White Violet

Open Closed NA NA NA

Common

Common

(for blue

and white)

Closed Open NA NA NA

Common

(for orange

and violet)

Closed Open Open Closed

Open Closed Closed Open

Use an ohmmeter to verify the conditions
above. If these conditions do not exist, go to
Section 7.

6 PUMP-CONTROL SET-UP

By combining two MGS-314/314D Series
switches with the interval relay (WE77/Ex-JR)
you can achieve intrinsically safe pump-control.

6.1 Interval relay wiring

MGS-314 Series

For pump-up action connect the red and black
wires from the high level switch to Terminals
1 and 2. Connect the red and black wires from
the low level switch to Terminals 8 and 9. The
jumpers should be between Terminals 3 and 4,
and Terminals 6 and 7.
For pump-down action connect the high level
switch to Terminals 8 and 9, and the low level
switch to Terminals 1 and 2. Leave the jumpers
in the same position as pump-up action. For
technical information on the WE77/Ex-JR
see Appendix A.
Two 10 kΩ resistors must be installed in parallel
across the leads as close to the MGS-314 Series
Switches as possible. One across leads 1 and 2,
the other across leads 8 and 9.

MGS-314D Series
(Assume the toggle is at position 'A' for the
following directions)

For pump-up action connect one common and
a corresponding open connection from the high
level switch to Terminals 1 and 2. Connect the
same color combination from the low level
switch to Terminals 8 and 9. The jumpers
should be between Terminals 3 and 4, and
Terminals 6 and 7.
For pump-down action connect the high level
switch to Terminals 8 and 9, and the low level
switch to Terminals 1 and 2. Leave the jumpers
in the same position as pump-up action. For
technical information on the WE77/Ex-JR see
Appendix A.

Two 10 kΩ resistors must be installed in parallel
across the leads as close to the MGS-314D Series
Switches as possible. One across leads 1 and 2,
the other across leads 8 and 9.

7 TROUBLESHOOTING

7.1 Introduction

The Penberthy Magnetic Level Meter Switch
is designed to give you years of unattended
service. However, failure of electrical equipment
can occur. Sound maintenance practices
require periodic inspection of the instrument to
ensure it is in good working order.

DANGER!

Energizing the switch with the cover removed
may cause ignition of flammable materials or
atmospheres, resulting in personal injury, death
or property damage.
Do not apply power to the switch while performing
these tests.

7.2 Switch test

With the switch toggle at position 'A' use an
ohmmeter to verify the conditions in section5.1.
If these conditions are not met remove the (9)
socket head cap screws holding the housing
together. With the ohmmeter still connected,
close the switch manually. If the switch still
doesn't change state, it is defective. Go to
Section8.

7.3 Actuation test

If the switch works (see Section 7.2) check
the toggle magnet [MGS-314 Series] or toggle
magnet/cam (MGS-314D Series). It should
travel freely with a minimum of lateral
(side-to-side) motion. This can be adjusted
by loosening or tightening the two dog point
setscrews that the toggle magnet pivots on
(MGS-314 Series) only. If the nylon tips are
damaged replace the setscrews.

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PENBERTHY MODEL MGS-314 SERIES AND MGS-314D SERIES LEVEL CONTROL SWITCH

INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS

8 TELEPHONE ASSISTANCE

If you are having problems with Penberthy
Level Meter Switch, notify the local
Penberthy distributor, or call the factory
direct at [phone] and ask for an
applicationsengineer.

To help us to assist you more effectively, please
have as much of the following information as
possible when you call:

• Instrument model # (MGS-314/314D Series)

• Name of the company from whom you
purchased the switch

• Invoice # and date

• Process material

• Process temperature

• Brief description of the problem

• Checkout procedures (from the instruction
manual) that failed

If attempts to solve your problem fail, you
may be requested to return your instrument
to the factory for testing. You must obtain a
return authorization (R.A.) number from your
authorized Penberthy distributor prior to
returning your unit. Failure to do so will result
in the unit being returned to you, without being
tested and freight collect. To obtain an R.A.
number collect the following information:

• Reason for return

• Person to contact at your company

• 'Ship-to' address

FIGURE 3
CONTROL DRAWING CSA APPROVED EXPLOSION-PROOF
FOR MGS-314/314D (7E741-009)

HAZARDOUS AREA NON-HAZARDOUS AREA

CLASS I DIV 1 GROUP B, C, D
CLASS II DIV 1 GROUP E, F, G
CLASS III DIV 1

Models MGS-314-C

MGS-314D-C

18"

A flame path seal-off shall be
installedwithin 18 in. of enclosure.

Wiring to be in accordance with National Electrical Code (NEC)
pertinentparts of the 500 Series of article5 or local codes as applicable.

There will be a minimum charge applied for
evaluation of non-warranty units. You will be
contacted before any repairs are performed if
they will result in additional charges in excess
of the minimum. If you return a unit that is
under warranty but not defective, the minimum
charge will apply.

5

PENBERTHY MODEL MGS-314 SERIES AND MGS-314D SERIES LEVEL CONTROL SWITCH

INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS

FIGURE 4
CONTROL DRAWING CSA APPROVED INTRINSICALLY
SAFE FOR MGS-314/314D (7E742-009)

TWO WIRE ENTITY CONTROL DRAWING

HAZARDOUS AREA
Use CSA certified safety barriers:
CLASS I DIV 1 GROUP A, B, C, D

CLASS II DIV 1 GROUP E, F, G
CLASS III DIV 1

MODEL MGS-314-C

1

/

or

2

MGS-314D-C

MAG. SWITCH

NO or NC

Vmax = 40 Vdc
Imax = 150 mA

C

= 0 nF

i

L

= 0 mH

i

TB1

COM

NON-HAZARDOUS AREA

Intrinsic safety

barrier

R < 1Ω

User wiring

Unused NO or NC lead shall be blind
terminated and insulated.
The intrinsic safety barrier parameters must
meet the following requirements:
Voc ≤ 40 V or Isc ≤ 150 mA;
Ca ≥ Cleads; La ≥ Lleads

C

Leads

L

Leads

OR

THREE WIRE ENTITY CONTROL DRAWING

HAZARDOUS AREA

Use CSA certified safety barriers:

CLASS I DIV 1 GROUP A, B, C, D
CLASS II DIV 1 GROUP E, F, G
CLASS III DIV 1

Model MGS-314-C

1

/

or

2 MGS-314D-C

MAG. SWITCH

NO

TB1 NC

COM

Vmax = 40 Vdc
Imax = 150 mA

C

= 0 nF

i

L

= 0 mH

i

C

Leads

L

Leads

MGS-314-C CONNECTIONS MGS-314D-C CONNECTIONS

Blue White Violet
Red

NO

NC

Black Black

Green

C

Case

Ground

Blue

Green

NON-HAZARDOUS AREA

Intrinsic safety

barrier

Multiple channel

R < 1Ω

NC

NO

1

C

NC

1

2

1

CASE

GROUND

NO

C

2

User wiring

Orange

2

Red

One multiple channel intrinsic safety barrier
must be used.
The barrier parameters must meet the
following requirements:
Vt ≤ 40 V or It ≤ 150 mA;
Ca ≥ Cleads; La ≥ Lleads

Installation shall conform to the
manufacturer's instructions supplied with the
intrinsic safety barrier as well as the National
Electric Code and ANSI/ISA-RP 12.6 or CSA C22
"Installation of Intrinsically Safe Instrument
Systems in Hazardous (classified) Locations."

Maximum non-hazardous area voltage must
not exceed 250 Vrms or Vdc.

For IS. installation temperature shall not
exceed 225°F (107°C).

6

PENBERTHY MODEL MGS-314 SERIES AND MGS-314D SERIES LEVEL CONTROL SWITCH

INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS - APPENDIX B

9 MODEL KFA5-SR2-Ex2.W.IR INTERVAL RELAY

9.1 Operation

Mode condition

Lead breakage monitor: built-in circuitry
monitors both control circuits for lead
breakage. If the current in one of the two
control circuits falls below 0.1 mA, the relay will
de-energize.

Output relay condition at power supply
interruption: when power is reconnected, the

output relay returns to its state prior to the
interruption.

9.2 Typical applications

1. Pump-up application with two MGS-314/314D
Magnetic Level Meter Switches

Level 1: Relay energized
Level 2: Relay remains energized
Level 3: Relay de-energizes
Level 4: Relay remains de-energized
Level 5: Relay energizes

2. Pump-down application with two
MGS-314/314D Magnetic Level Meter Switches

Level 1: Relay de-energized
Level 2: Relay remains de-energized
Level 3: Relay energizes
Level 4: Relay remains energized
Level 5: Relay de-energizes

9.3 Connection diagram

Two 10 kΩ resistors (R1) must be installed in
parallelacross the leads as close to the
MGS-314/314D switches as possible.
Oneacross leads 1 and 3, the other across
leads 4and 6.

Two 1 k

Ω resistors (R2) must be installed in

series with leads 3 and 6.

FIGURE 5
APPLICATION 1 - PUMP-UP DIAGRAM

Level 3

Level 2, 4

Level 1, 5

High level
sensor

Low level
sensor

FIGURE 6
APPLICATION 2 - PUMP-DOWN DIAGRAM

Level 3

Level 2, 4

Level 1, 5

High level
sensor

Low level
sensor

FIGURE 7
CONNECTION DIAGRAM

MGS-314

MGS-314

R1
10 KΩ ± 5%

R1
10 KΩ ± 5%

1

2

3

4

5

6

1

2

3

4

5

6

Intinsically-Safe Input

1

R2

1 KΩ

R2

1 KΩ

2

3

4

5

6

KFA5-SR2-Ex2.W.IR

KFA5-SR2-Ex2.W.IR

KFA5-SR2-Ex2.W.IR

8

Output 1

7

9

11

Output 2

10

12

14

Supply
120 Vac

15

8

7

Output 1

9

11

Output 2

10

12

14

Supply
120 Vac

15

8

7

Output 1

9

11

10

Output 2

12

14

Suppy
120 Vac

15

VCIOM-03387 © 2019, 2022 Emerson Electric Co. All rights reserved 07/22. Penberthy is a mark owned by one of the companies in the Emerson Automation
Solutions business unit of Emerson Electric Co. The Emerson logo is a trademark and service mark of Emerson Electric Co. All other marks are the property of their
prospective owners.

The contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their accuracy, they are not to be
construed as warranties or guarantees, express or implied, regarding the products or services described herein or their use or applicability. All sales are governed
by our terms and conditions, which are available upon request. We reserve the right to modify or improve the designs or specifications of such products at any time
without notice.

Emerson Electric Co. does not assume responsibility for the selection, use or maintenance of any product. Responsibility for proper selection, use and maintenance
of any Emerson Electric Co. product remains solely with the purchaser.

Emerson.com

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