ML42 Intelligent Displacer Level Transmitter

ML42 Intelligent Displacer Level Transmitter

Smart displacer (buoyancy) level transmitter for level and interface, 300 to 3,000 mm, ±0.5% FS, process temperatures -196 C to +450 C (meter range -70 to +450 C) and pressures up to PN420.

Key Specifications

Model: ML42
Principle: Buoyancy (displacer) with torque tube
Size / Connection: DN80 / DN100 flange (others on request)
Measuring range: Measuring range 300–3,000 mm (extended on request)
Accuracy: ±0.5% FS
Output / Protocol: 4–20mA two-wire; HART, Modbus, LoRa wireless options

Category: Level Gauges » Displacer Level Transmitter

Keywords:displacer level transmitter buoyancy level transmitter smart level transmitter high pressure level transmitter

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The ML42 measures level and liquid-liquid interface by buoyancy: a displacer suspended from a torque tube converts level change into a precise digital signal. Multi-point linearization, self-compensation and continuous self-diagnostics deliver ±0.5% FS accuracy with high long-term stability, and SIL2/3 certification covers safety-related service.

The full-text graphic LCD shows current, process variable, temperature and percent of range, and the meter adapts to the measuring point on site without calibration. Built-in RFI/EMI filtering keeps the signal clean in electrically noisy plants.

Key Features

Level and interface measurement with medium density difference from 0.08 g/cm3
Process temperature -70 C to +450 C, pressure up to PN420 (Class 2500)
Torque tube in Inconel 600 standard; Monel and Hastelloy-276 options; wetted parts 304 / 316L
Smooth filtering algorithm for a stable output signal
HART communication, 4-20mA output; Modbus and wireless LoRa options
IP66; explosion-proof versions Ex ia / Ex d

Technical Specifications

Supply voltage	12~30VDC; (HART≥ 17.75VDC)
Output signal	4~20mA, two-wire
Measuring range	300mm~3000mm (extended ranges on request)
Nominal pressure	≤PN420(Class 2500)
Nominal diameter	DN80, DN100or on request
Ambient temperature	-40°C~+80°C (≤-20°C, )
Working temperature	-70°C~+450°C
Measuring accuracy	±0.5%FS
Supply influence	max., ＜±0.2%
LCD display	Process temperature
Medium density difference	≥0.08g/m3
Torque tube material	Inconel600, optionalMonel, Hasetlloy-276: 304, 316L
Flange standard	HG/T20592-2009, HG/T20615-2009or on request
Cable entry	2NPT1/2(thread)or on request
Explosion protection type	intrinsically safeExia IIC T1~T6 Ga, flameproofExd IIC T1~T6 Gb
Protection class	IP66

FAQ

Can the ML42 measure interface level?

Yes. It measures both level and interface, provided the density difference between the two liquids is at least 0.08 g/cm3.

What range and accuracy does the ML42 offer?

Standard ranges are 300 to 3,000 mm (longer on request) with ±0.5% FS accuracy and multi-point linearization.

Is the ML42 suitable for safety instrumented systems?

HART versions carry SIL2 certification and the series is certified for SIL2/3 safety-related applications, with continuous self-diagnostics.

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Send your medium, pipe size, flow range, temperature and pressure to admin@hainameter.com or WhatsApp +86 15671082677.