Explosion Proof Rugged Magnetostrictive Level Sensor

Explosion Proof Rugged Magnetostrictive Level Sensor

MPX-R

Rugged Design with Robust Floats

The MPX-R is a rugged, explosion-proof level sensor designed for the most demanding liquid measurement environments. Engineered for harsh conditions, the MPX-R features large, buoyant floats and a durable stem—ideal for applications prone to heavy fouling or buildup. It provides highly accurate, repeatable readings of both interface levels and total volume, making it a reliable choice for oil & gas, petrochemical, water treatment, and other industrial settings.

The MPX-R supports both Modbus RTU (RS-485) and 4–20 mA outputs for seamless integration with any Modbus controller or PLC. It also works with Settler and Explorer, enabling secure, remote monitoring over the Internet.

  • Hazardous Area Certification: Certified for Class I Divisions 1 & 2, Groups C & D, Class I Zone 1, and Class I Zone 2, ensuring safe operation in hazardous environments with combustible gases or vapors.
  • Versatile Output Integration: Offers 4-20 mA and RS-485 (Modbus RTU) outputs for seamless integration into PLCs, SCADA systems, and industrial automation platforms.
  • Durability & Longevity: Rugged design measures up to 31.5 feet (9.6 m), ensuring reliable performance in diverse industrial environments with minimal maintenance.
  • Supports Dual-Level Interface Measurement

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MPX-R Datasheet
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MPX-R User Manual
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MPX-R Install Guide
  • Resolution:
    • 4-20 mA: 14 bit DAC (1 mm)
    • Modbus: 0.04 in. (1 mm)
  • Distance Accuracy:
    • 4-20 mA Modbus: Greater of ±0.05% of FS or 1 mm
  • Temperature Accuracy: RTD—1k Ohm: ±1°C
  • Probe Operating Temperature: -40º–85ºC (-40º–185ºF)
  • IP65
  • Electrical Connection: Terminal Block, 12–24 VDC
  • Typical current draw:
    • 4-20 mA: (single) 4-22 mA, (dual) 8-44 mA
    • Modbus (RS-485): 28mA
  • Reverse polarity protection
  • Surge protection (output 4 only)
  • RS-485: optional RST-6001 USB to RS-485 converter
  • 4-20 mA: factory set or optional RST-4100 programming module
  • Output:
    •  Single or dual loop-powered 4-20 mA
      • Set points:
        • 4 mA, probe bottom.
        • 20 mA, 10 in. below probe zero point or at customer specified point
    • Modbus RTU (RS-485), optional temperature output
  • Housing: Cast aluminum, epoxy coated, blue
  • Stem: 1.0” Ø 316L SS
  • Stem Length: 4–31.5 ft. (1.22–9.60 m)
  • CSA:
    • Rated 12-24 VDC; 4-20 mA or 80 mA; Ta 85°C
    • Class I, Division 1 & 2, Groups C & D T4
    • Ex d IIB T4
    • Ex nA IIB T4
    • Class I, Zone 1; AEx d IIB T4
    • Class I, Zone 2; AEx nA IIB T4

Settler

Remote Monitoring Gateway
Part #: 125422

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RST-6001

RST-6001

Modbus Data Logging
Part #: 125734

Inquire with sales to purchase

What is the difference between the MPX-E and MPX-R models?
  • MPX-E: Lightweight and compact, making it ideal for tight spaces.
  • MPX-R: Features larger, more robust floats and stems, making it well-suited for harsh environments prone to fouling or buildup.

The MPX-R is designed for precise liquid level and interface measurement in hazardous environments. It is ideal for applications such as storage tanks, oil/water interface measurement, industrial effluent, and high-turbidity environments in industries like oil and gas, petrochemical, water treatment, and more.

The MPX sensor utilizes Modbus RTU (RS-485 output), allowing seamless integration with any Modbus-compatible controller or PLC.

Industries that benefit from the MPX-R include:

  • CI, D1 Hazardous Locations
  • Storage Tanks
  • Fuel Tanks
  • Oil/Water Interface Measurement
  • Thick, Viscous, Sludgy Fluids
  • Industrial Effluent
  • Power Generation
  • Water and Wastewater Treatment
  • Pulp and Paper
  • Biotech
  • Oil and Gas
  • Petrochemical
  • Chemical

The MPX-R is designed for various fluids, including:

  • Storage and fuel tanks
  • Oil/water interface measurement
  • Thick, viscous, or sludgy fluids
  • Industrial effluent and wastewater

Increase the sensitivity settings on your sensor.

Here are the steps to get the sensor communication back as sensor #1 using the APG Modbus software and the RST-6001 (USB to RS485 converter). 

It’s essentially the same process below to establish communication. 

 

Establishing Communication:

  1. On the APG Modbus software, go to Configure>Communication.
  2. Make sure the USB box is checked; the Sensor Type is MPX-1/4 RS485 and the Sensor# ID is showing 1.
  3. Click Save Configuration and then click Save.
  4. Click on the Green “Start Communication” Button.

After communication has been established, use the second procedure to change the sensor address. 

 

Changing the Sensor Address:

  1. Change Register 400 from 1 to the desired address number.
  2. Click Send. At this point, you will see a Comm Bad. That’s ok, go to Step 3.
  3. Click again on Configure>Communication.
  4. Change the Sensor ID from 1 to the new address number.
  5. Click Save Configuration and then click Save.
  6. Click on the Green “Start Communication” Button.

Your MPX probe should be communicating to the software with its new address. 

MOUNT

Flange, No Mount, NPT
OUTPUT

4-20 mA, Modbus, Remote Monitoring
CERTIFICATION

CSA – General, Explosion Proof
ENCLOSURE PROTECTION

IP65
INDUSTRY

Chemical, Food & Beverage, Industrial Automation, Oil & Gas, Water & Wastewater
PROBE LENGTH

1' – 12.5', 4' – 32'

WARRANTY

APG warrants its products to be free from defects in material and workmanship under normal use and service of the product for 24 months from the date of shipment from APG, unless otherwise specified by APG in writing. Read our full warranty policy HERE.

RETURNS

Returns and allowances must be authorized by APG in advance, which authorization may be granted or withheld by APG in APG’s sole and absolute discretion. Read our full return policy HERE.

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