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data sheet LMK 358

data sheet LMK 358

Product catalog summary

Overview: The LMK 358 is a detachable stainless steel probe designed for level measurement in waste water, waste, and high viscosity media. It features a capacitive ceramic sensor and is suitable for various applications including water, sewage, fuel, and oil level monitoring.

Specifications:

Accuracy: Standard accuracy is 0.35% FSO, with an optional accuracy of 0.25% FSO.
Nominal Pressure: Ranges from 0 to 40 cmH2O up to 0 to 100 mH2O.
Output Signals: Available in 2-wire (4-20 mA) and 3-wire (0-10 V) configurations.
Special Characteristics: Detachable cable assembly and sensor head, 39.5 mm diameter, suitable for sewage and viscous media.

Optional Versions:

Intrinsically safe version for gas and dust (IS-version).
Diaphragm made of 99.9% Al2O3.
Various cable and elastomer options.

Technical Data:

Pressure and Level: Nominal pressure gauge ranges from 0.04 to 10 bar, with overpressure limits up to 35 bar.
Performance: Long-term stability of ≤ ± 0.1% FSO/year, with a turn-on time of 700 msec and a max response time of 380 msec.
Thermal Effects: Tolerance band of ≤ ± 1% FSO in a compensated range of -20 to 80 °C.
Electrical Protection: Includes short-circuit protection and lightning protection for 2-wire systems.

Materials: The housing is made of stainless steel 1.4404 (316L), with seals available in FKM and EPDM. The diaphragm is ceramic Al2O3, with a protection cap made of POM-C.

Explosion Protection: Approved for use in Zone 0 and Zone 20 environments, with specific safety technical maximum values.

Accessories: Includes mounting flanges, terminal clamps, and various process displays (CIT series) for enhanced functionality.

Applications: Ideal for groundwater level measurement, rain spillway basins, waste water treatment, water recycling, fuel storage, and biogas plants.

Catalog excerpts

LMK 358 Detachable Stainless Steel Probe Ceramic Sensor accuracy according to IEC 60770: standard: 0.35 % FSO option: 0.25 % FSO The detachable stainless steel probe LMK 358 has been designed for level measurement in waste water, waste and higher viscosity media. Basic element is a capacitive ceramic sensor. Nominal pressure from 0 ... 40 cmH2O up to 0 ... 100 mH2O Output signals In order to facilitate stock-keeping and maintenance the sensor head is plugged to the cable assembly with a connector and can be changed easily. 2-wire: 4 ... 20 mA 3-wire: 0 … 10 V others on request Special characteristics ► cable assembly and sensor head detachable especially suitable for sewage, viscous and pasty media Water ground water level measurement rain spillway basin IS-version Ex ia = intrinsically safe for gas and dust different kinds of cables and elastomers BD SENSORS GmbH BD-Sensors-Straße 1 D - 95199 Thierstein Sewage waste water treatment water recycling Fuel and oil level monitoring in open tanks with low filling heights fuel storage tank farms biogas plants www.bdsensors.de info@

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Detachable Stainless Steel Probe Input pressure range Nominal pressure gauge [bar] 0.04 Level [mH2O] 0.4 Overpressure [bar] 2 Max. ambient pressure (housing): 40 bar Output signal / Supply Standard Option IS-version Option 3-wire Performance Accuracy 1 Permissible load Influence effects Long term stability Turn-on time Mean response time Max. response time 1 Technical Data standard: ≤ ± 0.35 % FSO option: ≤ ± 0.25 % FSO Rmax = [(VS – VS min) / 0.02 A] Ω supply: 0.05 % FSO / 10 V load: 0.05 % FSO / kΩ ≤ ± 0.1 % FSO / year at reference conditions 700 msec ≤ 200 msec measuring rate 5/sec 380 msec...

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Detachable Stainless Steel Probe Technical Data Wiring diagram 2-wire-system (current) Pin configuration Electrical connection Supply + Supply – Signal + (only for 3-wire) Shield 5 cable colours (IEC 60757) WH (white) BN (brown) GN (green) GNYE (green-yellow) sensor head and cable detached

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Detachable Stainless Steel Probe Technical Data Accessories cable gland M16x1.5 with seal insert (for cable-∅ 4 ... 11 mm) size b D d2 d4 f k n Technical data Suitable for all probes Flange material stainless steel 1.4404 (316L) Material of cable gland standard: brass, nickel plated on request: stainless steel 1.4305 (303); plastic Seal insert material: TPE (ingress protection IP 68) Hole pattern according to DIN 2507 Weight Ordering type Ordering code DN25 / PN40 with cable gland brass, nickel plated ZMF2540 1.4 kg DN50 / PN40 with cable gland brass, nickel plated ZMF5040 3.2 kg DN80 / PN16...

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stainless steel 1.4404 (316L) customer Electrical connection PVC-cable (grey, Ø 7.4 mm) PUR-cable (black, Ø 7.4 mm) FEP-cable (black, Ø 7.4 mm) TPE-U-cable (blue, Ø 7.4 mm) customer Accuracy standard 0.35 % FSO option 0.25 % FSO customer Cable length in m Special version standard customer 1 shielded cable with integrated ventilation tube for atmospheric pressure reference © 2022 BD|SENSORS GmbH - The specifications given in this document represent the state of engineeringat the time of publishing. We reserve the right to make modifications to the specifications and materials.

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