JUPITER® Model JM4 - MAGNETOSTRICTIVE LEVEL TRANSMITTER

JM4-511A-310 + 2CH-00AN-F01-00-392

The JUPITER® Model JM4 transmitter operates on the magnetostrictive principle, using the Time-of-Flight method for level measurement. The device sends a low-energy electronic pulse down a magnetostrictive wire within a probe. A permanent magnet inside a float on the liquid level intersects the wire, generating a magnetic field. This interaction creates a mechanical wave that travels up the wire to a sensor, which measures the time it takes for the wave to arrive. The system converts this time-of-flight data into an accurate liquid level reading.

Step-by-Step Working Principle

1. Pulse Generation: The electronics assembly generates a low-energy electrical pulse.
2. Pulse Travel: This pulse travels down the length of the magnetostrictive wire inside the probe at the speed of light.
3. Float Interaction: The float, with its integrated permanent magnets, is positioned at the liquid's surface. Its magnetic field intersects the wire at that specific location.
4. Wave Creation: The interaction between the passing electrical pulse and the float's magnetic field creates a localized mechanical disturbance (or acoustic wave) in the wire.
5. Wave Propagation: This mechanical wave travels up the magnetostrictive wire at a constant, sound-speed rate.
6. Detection: A piezoelectric sensor at the top of the probe detects the mechanical wave.
7. Time Measurement: A timer precisely measures the elapsed time from when the initial electrical pulse was sent to when the mechanical wave was detected.
8. Level Calculation: The electronics and software interpret this time-of-flight data and perform calculations to determine the liquid level.
9. Output: The resulting liquid level data is then transmitted as an analog or digital signal.

 Full Datasheet

Transmitter Feature  

• Manufacturer :  Magnetrol 
• Product No. :JM4-511A-310
• BASIC MODEL NUMBER : Pulsar JM4 - Jupiter JM4 magnetostrictive level transmitter
• POWER: 5 - 24 V DC, two wire loop powered
• OUTPUT / ELECTRONICS: 11 -  4-20 mA with HART® - SIL enhanced electronics (full FMEDA report available)
• ACCESSORIES/MOUNTING: A - Digital display and keypad - Integral
• CLASSIFICATION: 3 - cFMus explosion proof (digit 5 = 1); cFMus explosion proof & FNICO field device (digit 5 = 2)
• HOUSING:  1  - Cast aluminium
• CABLE ENTRY / SUNSHADE OPTION: 0 - 1/2" NPT-F (2 entries - 1 plugged) - No sunshade

There are several Model of pressure transmitters, for more details read the PDF below 

Basic Ordering Information Transmitter

Probe Feature 

• Manufacturer :  Magnetrol 
• Product No. :2CH-00AN-F01-00-392
• BASIC MODEL NUMBER : 2CH  - Standard bottom mount offset (-40 °C (-40 °F) ≤ T ≤ 260 °C (500 °F)
• MOUNTING LOCATION: 00  - Left side mount on MLI or chamber (standard)
• MATERIAL OF CONSTRUCTION: A - 316 stainless steel probe with powder-coated aluminium sensor enclosure
• PROBE OPTIONS AND HAZARDOUS LOCATION APPROVALS : N - All other approvals (does NOT match model JM4 with digit 8 = B) (Standard probe)
• MOUNTING CLAMPS FOR CHAMBER: F - MLI with a 2 1/2" ASME chamber (Chamber with high-temp insulation)
• NOT USED: 0 -  None
• LEVEL / INTERFACE MEASUREMENT: 1 - Measure only the total liquid level
• NOT USED: 00 -  None
• NOT USED: 392 -  392cm (154,3")

Basic Ordering Information probe