Brand: KOBOLD

KOBOLD NMB Magnetostrictive Level Transmitter, Expert Line

Name: KOBOLD NMB Magnetostrictive Level Transmitter – Datasheet & Quote
Brand: KOBOLD
SKU: NMB

Description

Magnetostrictive level measurement with 0.1 mm resolution for clean liquids

The KOBOLD NMB Expert Line is a magnetostrictive level transmitter for clean liquids where accuracy matters, including fuels, solvents and alcohol derivatives, and the datasheet names custody transfer type measurement as a suitable use. A float with a magnetic disc moves along a guide tube that holds a magnetostrictive wire. An electronic pulse travels along the wire, a torsion wave is created where it meets the float magnet, and the 4 to 20 mA output is proportional to the time between excitation and detection.

Rigid and flexible probes, a plastic-coated version for chemicals and a mini version are offered. The unit supports a graphic NRM-300P display, a 99-point linearisation table for volume measurement and interface measurement, and it can also be fitted to a KOBOLD NBK bypass indicator as a supplementary transmitter.

Technical specifications

Parameter	Specification
Measured values	Liquid level, distance, volume; interface measurement
Resolution / non-linearity	1 mm: ±2 mm or ±0.02 % F.S. (±3 mm above 10 m); 0.1 mm: ±1 mm or ±0.01 % F.S.; hysteresis ±0.25 mm to ±1 mm
Rigid probe, 1.4571 stainless steel	Length 0.5 to 4.5 m; up to 25 bar
Flexible probe	Length 2 to 15 m; up to 16 bar
Plastic-coated probe (PFA, PVDF, PP)	Length 0.5 to 3 m; up to 3 bar
Mini version	Length 0.5 to 1.5 m; up to 10 bar; float Ø 28 x 28 mm
Process temperature	-40 to +90 °C (see temperature diagram)
Ambient temperature	-40 to +70 °C; plastic housing or display -25 to +70 °C
Output	4 to 20 mA (3.9 to 20.5 mA), HART (loop resistance at least 250 Ω); error indication 22 mA, 3.8 mA or hold
Supply voltage	12.5 to 36 VDC; load RL = (Us – 12.5 V) / 0.02 A
Damping	Adjustable 0 to 99 s; minimum distance 200 mm
Protection	IP67; IP68 for output code 9 (4 m water column for 4 hours)
Housing	PBT plastic, painted aluminium or stainless steel; 2 x M20 x 1.5 cable glands and 2 x ½” NPT
ATEX	II 1 G Ex ia IIB T6…T5 Ga; II 2 G Ex db IIB T6…T5 Gb; II 1/2 G Ex db ia IIB T6…T5 Ga/Gb; IECEx versions in the order code
Process connections	G 1, G 2, 1″ and 2″ NPT, TriClamp 1½” to 4″, sliding sleeve (BSP or NPT, PVDF) as accessory

Versions and floats

Model	Design
NMB-T / NMB-B	Transmitter, rigid probe; B adds the display
NMB-TF / NMB-BF	Flexible probe, up to 15 m
NMB-E / NMB-G	PFA-coated probe for chemicals (not Ex); G adds the display
NMB-M / NMB-C	Mini transmitter (not Ex); C adds the display

The float must be chosen for the liquid density. The standard stainless float is for liquids from 0.55 kg/dm³; the Ø124 mm ball float (1.4401, 25 bar) is for 0.4 kg/dm³ and above; the Ø54 mm titanium float is for 0.55 kg/dm³; and the Ø50 x 100 mm titanium float is for 0.45 kg/dm³. For the PFA-coated models the PVDF float needs 0.7 kg/dm³ and the PP float 0.4 kg/dm³. Float option 0 means no float, which is for assembly with an NBK bypass.

Ordering and Ex versions

The order example is NMB-T RR25 A 05 1 S: model, probe type and connection, housing, probe length, electrical output and resolution, and float. The output code selects 4 to 20 mA or HART, 0.1 mm or 1 mm resolution, and none, Ex ia, Ex d or Ex d + Ex ia. Probe length for the rigid probe goes up to 4.5 m, and for the flexible probe up to 15 m.

Confirm before ordering: liquid density and temperature for the float, tank opening against the float diameter, the Ex zone and gas group (the datasheet lists IIB), and whether the accuracy data apply, because they are only valid at the factory setting and not for a bypass float, where 5 mm is given for a factory-calibrated float for NBK.

Documents and quotation

The KOBOLD NMB Expert Line datasheet (edition 1/05-2026) is attached to this page. Browse our Level Instrumentation category for related instruments, or compare with the ABB LMT200 magnetostrictive level transmitter.

For a quotation, send the probe type and length, process connection, liquid and density, temperature, pressure, output and resolution, and hazardous-area requirement.

Datasheets & Documents

Datasheet KOBOLD NMB magnetostrictive level transmitter datasheet Download

Reviews (0)

Reviews

There are no reviews yet.

How would you rate this product?

About brand

KOBOLD Messring GmbH is a German instrumentation manufacturer based in Hofheim am Taunus, founded in 1980 by Klaus J. Kobold. It develops and manufactures instruments for monitoring, measuring and regulating flow, pressure, level and temperature, and the international KOBOLD group of companies serves virtually all sectors of industry.

KOBOLD flow and level instruments

The KOBOLD range covers Coriolis, thermal mass, magnetic inductive, turbine, oval gear, oscillation and variable area flow meters and flow switches, together with guided wave radar, 80 GHz radar, magnetostrictive, tuning fork and bypass level instruments. Many models carry ATEX or IECEx approvals, and several offer HART, Modbus or IO-Link communication.

Requesting KOBOLD instruments from Seven Star LLC

Seven Star LLC, an independent supplier in Muscat, lists selected KOBOLD flow and level instruments for oil and gas, water, power and process plants in Oman and the GCC. Send the model code, measuring range, process connection and approvals needed, and Seven Star LLC will prepare a quotation from the KOBOLD datasheet.