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data sheet LMK 358 H

data sheet LMK 358 H

Product catalog summary

Overview: The LMK 358H is a detachable stainless steel probe designed for level measurement in various media, including wastewater and high-viscosity substances. It features a capacitive ceramic sensor and HART® communication for setting offset, span, and damping.

Specifications: The probe offers a nominal pressure range from 0 to 100 mH2O with an accuracy of 0.1% FSO according to IEC 60770. It supports a 2-wire output signal of 4-20 mA and operates within permissible temperatures up to 85°C.

Special Characteristics: The probe has a diameter of 39.5 mm, high overpressure resistance, and long-term stability. Optional versions include an intrinsically safe IS-version for gas and dust, and a diaphragm made of 99.9% Al2O3.

Applications: The LMK 358H is suitable for water level measurement, sewage treatment, fuel and oil level monitoring, and biogas plants.

Technical Data: The probe's input pressure range varies from 0.06 to 10 bar, with overpressure capabilities up to 35 bar. It features a maximum ambient pressure of 40 bar and a permissible load calculated by the formula Rmax = [(VS – VS min) / 0.02 A] Ω.

Performance: The probe ensures high accuracy with a long-term stability of ≤ ± (0.1 x turn-down) % FSO/year. It has a turn-on time of 850 msec and a mean response time of 140 msec.

Thermal and Electrical Protection: The probe operates within a compensated temperature range of -20 to 80°C and includes short-circuit and lightning protection. It complies with electromagnetic compatibility standards EN 61326.

Mechanical Stability: The probe withstands vibrations up to 4 g according to DIN EN 60068-2-6.

Materials: The housing is made of stainless steel 1.4404 (316L), with seals available in FKM and EPDM. The diaphragm is ceramic Al2O3, and the cable sheath options include PVC, PUR, FEP, and TPE-U.

Explosion Protection: The probe is ATEX certified for use in explosive environments, with specific temperature and pressure conditions for different zones.

Accessories: Available accessories include mounting flanges, terminal clamps, and various process displays with LED and LC displays.

Catalog excerpts

LMK 358H Detachable Stainless Steel Probe with HART®-Communication Ceramic Sensor accuracy according to IEC 60770: 0.1 % FSO Nominal pressure The detachable stainless steel probe LMK 358H has been designed for level measurement in waste water, waste and higher viscosity media. Basic element is a capacitive ceramic sensor. 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 others on request Special characteristics ► HART® communication (setting of offset, span and damping) high overpressure resistance high long-term stability Preferred areas of use are Water ground water level measurement rain spillway basin Sewage waste water treatment water recycling IS-version Ex ia = intrinsically safe for gas and dust accessories e.g. mounting flange with cable gland and terminal clamp BD SENSORS GmbH BD-Sensors-Straße 1 D - 95199 Thierstein Fuel and oil level monitoring in open tanks with low filling heights fuel storage tank farms biogas plants

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LMK 358H Detachable Stainless Steel Probe Input pressure range 1 Nominal pressure gauge [bar] 0.06 Level [mH2O] 0.6 Overpressure [bar] 2 Max. ambient pressure (housing): 40 bar 1 Permissible load Long term stability Influence effects Turn-on time Mean response time Max. response time Adjustability TDmax = 1:10 ≤ ± 0.2 % FSO ≤ ± [0.2 + 0.03 x TD] % FSO pN < 160 mbar TDmax = 1:3 ≤ ± [0.2 + 0.1 x TD] % FSO pN ≥ 1 bar TDmax = 1:10 TD ≤ 1:5 ≤ ± 0.1 % FSO TD > 1:5 ≤ ± [0.1 + 0.02 x TD] % FSO Rmax = [(VS – VS min) / 0.02 A] Ω load at HART-communication: Rmin = 250 Ω ≤ ± (0.1 x turn-down) % FSO / year...

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LMK 358H Detachable Stainless Steel Probe Miscellaneous Current consumption Weight Ingress protection CE-conformity ATEX Directive Wiring diagram Technical Data max. 21 mA approx. 650 g (without cable) IP 68 EMC Directive: 2014/30/EU 2014/34/EU Pin configuration Electrical connection Supply + Supply – Shield 7 cable colours (IEC 60757) WH (white) BN (brown) GNYE (green-yellow) sensor head and cable detached HART® is a registered trade mark of HART Communication Foundation; Windows® is a registered trade mark of Microsoft Corporation

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LMK 358H 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...

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stainless steel 1.4404 (316L) customer Diaphragm ceramics Al2O3 96 % ceramics Al2O3 99.9 % customer HART -communication 4 … 20 mA / 2-wire HART®-communication intrinsic safety 4 … 20 mA / 2-wire customer Seal FKM EPDM customer Electrical connection PVC-cable (grey, Ø 7.4 mm) 1 PUR-cable (black, Ø 7.4 mm) 1 FEP-cable (black, Ø 7.4 mm) 1 TPE-U-cable (blue, Ø 7.4 mm) 1 customer Accuracy pN ≤ 1:5 TD ≥ 1 bar ≤ ± 0,2 % FSO 0.1 % FSO pN ≤ 1:5 TD < 1 bar ≤ ± 0,1 % FSO 0.2 % FSO customer Cable length in m Special version standard customer shielded cable with integrated ventilation tube for atmospheric...

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