Magnetrol Jupiter JM4, Installation And Operating Manual

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ORI-46.650 Jupiter Magnetostrictive Transmitters

ORI-46.650 Jupiter Magnetostrictive Transmitters 

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1.3.3  Centering Disc   

All Jupiter model JM4 transmitters that come with a stilling well 

are also provided with a centering disc to prevent the probe from 

making contact with the stilling well.

1.4 Wiring

Caution:

  HART version of the JUPITER Model JM4 transmitter 

operate at voltages of 11-28.6 VDC, while F

OUNDATION

fieldbus versions operate at 9-17.5 VDC. Higher voltages 

will damage the transmitter.

Wiring connections between the power supply and the Jupiter 

Model JM4 transmitter should be made using 18-22 AWG 

shielded twisted pair instrument cable. Connections are made 

to the terminal strip and the ground connections within the top 

enclosure compartment.
The directions for wiring the Jupiter transmitter depend on the 

applications:

•  General Purpose or Non-Incendive (Cl I, Div. 2)
•   Intrinsically Safe
•   Explosion Proof

WARNING!

  Explosion hazard. Do not connect or disconnect 

designs rated Explosion proof or Non-incendive unless 

power has been switched off and/or the area is known to 

be non-hazardous.

1.4.1  General Purpose or Non-Incendive (Cl I, Div. 2) 

A general purpose installation does not have flammable media 

present.
Areas rated Non-Incendive (Cl I, Div. 2) have flammable media 

present only under abnormal conditions.
No special electrical connections are required.

Caution: 

If flammable media is contained in the vessel, the trans

-

mitter must be installed per Class I, Div 1 standards of 

area classification.

To install General Purpose or Non-Incendive wiring:

1. Remove the cover from the wiring compartment of the trans-

mitter. Install the conduit plug in the unused opening and use 

PTFE tape/sealant to ensure a liquid-tight connection.

2. Install a conduit fitting and pull the supply wires.

3. Connect shield to an earth ground at power supply.

4. Connect an earth ground wire to the nearest green ground screw 

(not shown in illustration).

5. Connect the positive supply wire to the (+) terminal and the 

negative supply wire to the (-) terminal.

6. Replace and tighten the cover to the transmitter wiring compartment 

before applying power.

1.4.2  Intrinsically Safe 

An Intrinsically Safe (IS) installation potentially has flammable 

media present. An approved IS barrier must be installed in the 

non-hazardous (safe) area to limit the available energy out to the 

hazardous area. 

See Agency Specifications Section 2.4.1.

To install Intrinsically Safe wiring:

1.  Ensure that the IS barrier is properly installed in the safe area 

(refer to local plant or facility procedures). Complete the wiring 

from the power supply to the barrier and from the barrier to the 

JM4 transmitter.

2. Remove the cover from the wiring compartment of the trans-

mitter. Install the conduit plug in the unused opening and use 

PTFE tape/sealant to ensure a liquid-tight connection.

3. Install a conduit fitting and pull the supply wires.

4. Connect shield to an earth ground at power supply.

5. Connect an earth ground wire to the nearest green ground screw 

(not shown in illustration).

6. Connect the positive supply wire to the (+) terminal and the 

negative supply wire to the (-) terminal.

7. Replace and tighten the cover to the wiring compartment of the 

transmitter before applying power.

1.4.3  Explosion Proof 

Explosion Proof (also referred to as XP or flameproof) is another 

method of designing equipment for installation into hazardous 

areas. A hazardous location is an area in which flammable gases 

or vapors are (or may be) present in the air in quantities suffi-

cient to produce explosive or ignitable mixtures
The wiring for the transmitter must be contained in Explosion 

Proof conduit extending into the safe area.

• Due to the specialized design of the JM4 transmitter, no Explo-

sion Proof conduit fitting (EY seal) is required within 18” of the 

transmitter.

• An Explosion Proof conduit fitting (EY seal) is required between 

the hazardous and safe areas. 

To install Explosion Proof transmitter:

1. Install Explosion Proof conduit from the safe area to the conduit 

connection of the JM4 transmitter (refer to the local plant or 

facility procedures).

2. Remove the cover from the wiring compartment of the transmit-

ter.

3. Connect shield to an earth ground at the power supply.

Red (+)

(+)
(-)

Black (-)

Fig. 1-8. Wiring Diagram