SENSVISION HLC 900 – An Equivalent to the BD Sensors LMK 858
The BD Sensors LMK 858 is a detachable plastic submersible level probe for hydrostatic measurement in aggressive and viscous media such as acids, alkalis and sludge. A capacitive ceramic sensor with a 99.9% high-purity Al₂O₃ diaphragm sits in a 45 mm PP-HT housing, covering nominal ranges from 0 … 40 cmH₂O up to 0 … 100 mH₂O at ±0.35% FSO standard accuracy, or ±0.25% FSO as an option, with a 2-wire 4 … 20 mA output on a 9 … 32 V DC supply.
The SENSVISION HLC 900 is a directly equivalent detachable plastic probe covering the same 0 to 0.4 mH₂O through 0 to 100 mH₂O span across thirteen standard steps – 0.04 bar to 10 bar gauge – with matching accuracy of up to ±0.35% of span as standard and up to ±0.25% of span optionally, the same 4 to 20 mA two-wire output on 9 to 32 VDC, and an additional 0 to 10 V three-wire option on 12.5 to 32 VDC. Long-term stability is quoted at up to ±0.1% of span per year.
The detachable design is the reason to choose either probe. The sensor head separates from the cable assembly – on the HLC 900 through an M12x1 four-pin connector – so a damaged or chemically attacked cable can be replaced without pulling and rebuying the whole instrument, and the sensor can be lifted out for cleaning or recalibration and refitted without disturbing the cable run. In a sludge or acid tank, where the cable is the part most likely to suffer, that turns a probe replacement into a cable replacement.
Everything below the connector is plastic, not stainless steel. Both probes use a PP-HT housing of 45 mm diameter weighing approximately 400 g without cable, with FKM and EPDM seal options and PVC, PUR or FEP cable sheaths carrying the integrated atmospheric reference tube for gauge measurement, sealed to IP 68 for permanent submersion. Both carry integrated lightning protection on the two-wire version for outdoor and open-tank installations. One specification difference is worth noting: the LMK 858 is supplied with the 99.9% ceramic diaphragm as standard, whereas on the HLC 900 the 96% grade is standard and 99.9% is the option, so the high-purity diaphragm should be specified explicitly when matching an existing LMK 858.
Whether you are replacing an installed BD Sensors LMK 858 or specifying a serviceable level probe for a new sludge, acid or effluent application, the SENSVISION HLC 900 delivers equivalent measurement performance, wetted materials and the same detachable cable convenience as a dependable, cost-effective alternative.
BD SensorsTM and associated part numbers (e.g., LMK 858) are trademarks or registered trademarks of BD Sensors GmbH. Diversified Technologies is an independent distributor and is not affiliated with, endorsed by, or sponsored by BD Sensors GmbH. References to BD Sensors and associated part numbers on this website are used strictly for informational, comparative, and cross-referencing purposes to assist customers in finding functional alternatives. All trademarks are the property of their respective owners.
Further Information on the HLC 900
The SENSVISION HLC 900 has been engineered to provide the same fit, form, function and performance as the BD Sensors LMK 858, making it an ideal replacement for existing installations and new OEM applications.
Key Features:
Detachable sensor and cable assembly via an M12x1 four-pin connector for simple cable replacement
Nominal level ranges from 0 to 0.4 mH₂O up to 0 to 100 mH₂O across thirteen standard steps
Nominal pressure ranges from 0.04 bar to 10 bar gauge
Standard accuracy up to ±0.35% of span, optional up to ±0.25% of span
Long-term stability up to ±0.1% of span per year; thermal error up to ±0.1% of span per 10 K
4 to 20 mA, two-wire output on 9 to 32 VDC, or optional 0 to 10 V, three-wire on 12.5 to 32 VDC
Chemically resistant PP-HT housing, 45 mm diameter, approximately 400 g without cable
Ceramic Al₂O₃ diaphragm, 96% standard with optional 99.9% high-purity grade
Seal options in FKM or EPDM, other materials on request
PVC, PUR or FEP cable, 7.4 mm diameter, with integrated atmospheric reference tube
Overpressure resistance 2 to 35 bar; maximum ambient housing pressure 10 bar
Mean response time under 200 ms, maximum 380 ms; 5 measurements per second
Permissible medium, electronics and ambient temperature −20 °C to 80 °C, compensated 0 °C to 50 °C
Maximum current consumption 25 mA; turn-on time 700 ms
IP 68 ingress protection for permanent submerged installation
Short-circuit and reverse-polarity protection with integrated lightning protection on the two-wire version
Electromagnetic compatibility to EN 61326; prepared for PP-HT pipe mounting up to 2 m
The SENSVISION HLC 900 is manufactured to deliver equivalent performance, reliability and installation compatibility, offering a cost-effective alternative for aggressive, viscous and sludge level measurement.