Magnetic level indicator for basic liquid applications

  • Cost-effective level measurement; no power supply needed
  • Measuring range: 0.3…5.5 m; 1...18 ft (others on request)
  • Density: 700…1200 kg/m / 43.7…74.91 lb/ft3
  • -70…+200°C / -94…+392°F; -1…40 barg / -14.5…580 psig



The BM26A-1000 is a magnetic level indicator (MLI) for basic liquid applications. The cost-effective level indicator is particularly suitable for continuous level measurement in water storage tanks, condensate receiver tanks as well as wash and surge tanks for fuels, lubricates, additives or similar chemicals.

The level indicator features a rugged metallic design with the magnetic flaps housed in an IP68 rated, hermetically sealed glass tube. It provides a highly visible local level indication. There is absolutely no power supply needed. However, in applications with more advanced signal output requirements, the MLI can be easily equipped with optional reed switches or a reed-chain level transmitter providing analogue or digital output signals.

Product highlights

  • Best price/performance ratio
  • Rugged metallic design
  • Easy to install, safe and no commissioning
  • Flaps housed in hermetically sealed glass tube (IP68)
  • Highly visible level indication works without power supply
  • Optional Plexiglas® anti-icing indication
  • Available with optional reed switches (3-wire, NAMUR) or reed-chain level transmitter (4…20 mA/HART®7, FF, PA output)

Typical applications


  • Water storage tanks
  • Condensate receiver tanks and condensate hot wells
  • Mill water storage tanks
  • Fuel tanks
  • Vessels for lubrication oil and other hydraulic fluids
  • Skids
  • Metallic tank manufacturers

Accessories for this product

LT40 reed chain transmitter


Reed-chain level transmitter for magnetic level indicators

  • Aluminium or stainless-steel housing (IP66/68) with optional backlit display
  • Remote version for temperatures >+300°C / >+572°F
  • Top or bottom mounted electronics
  • 4…20 mA/HART®7, FOUNDATIONTM fieldbus or Profibus-PA output
  • ATEX / IECEx certifications

MS15  reed limit switch


Reed limit switch for magnetic level indicators

  • Polyester-coated aluminium or stainless-steel housing (IP66/68)
  • 3-wire (NAMUR) single pole double throw (SPDT)
  • Hysteresis: 28 mm / 1.1″
  • 100VA/1A/250 VAC or 250 VDC
  • ATEX / IECEx certifications



Reed limit switch for magnetic level indicators

  • Aluminium housing (IP66/68)
  • 3-wire (NAMUR) single pole double throw (SPDT)
  • Hysteresis: 28 mm / 1.1″
  • 60VA/1A/250 VAC or 250 VDC
  • ATEX / IECEx certifications


Technical data

Measurement principlesFloat in bypass
Level measurement typeContinuous measurement
Measured mediaLiquids
Contact to measured mediumYes
Interface measurementNo
Measuring range (liquids)0.3…5.5 m/
1...18 ft (other on request)
Process pressure (relative)

-1…40 barg/
-14.5…580 psig

Process temperature


Wetted partsAustenitic stainless steel (1.4404/316L), Titanium
Process sealsAramid, Graphite, Polytetrafluoroethylene (PTFE)
Accuracy (liquids)

±10 mm/
0.39 in
(optional: ±5 mm / 0.2 in with LT40)


Certificates/Approvals ExATEX, IECEx
Certificates/Approvals OthersNACE, PED/EN 13445
Ingress protectionIP68


Digital outputsFOUNDATION™ fieldbus, HART®, PROFIBUS PA
Discrete outputsLimit switches
Analogue outputs4…20 mA

Process connections

Flange connectionsEN (1092-1): DN15…50
ASME (B 16.5): ½...2″
Thread connections

G½, G¾
½ NPT, ¾ NPT

Weld-in connections

½", ¾"