LMK 331
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PRESSURE MEASUREMENT LMK 331 Screw-in Transmitter with Ceramic Sensor The screw-in transmitter LMK 331 has been specially designed for level and process measurement. Due to the semiflush mounted pressure sensors the LMK 331 can also be used in viscous or contaminated media. Pressure port material is alternatively stainless steel 1.4571 (316Ti), or, for particularly aggressive media, PVDF or PVC. For process measurement applications different process connections are available on request. Additional it is possible to use the screw-in transmitter LMK 331 in explosive area (zone 0). Preferred areas of use are: ► tank level measurement ► water and sewage treatment ► paper industry ► chemical industry The ceramic sensors feature high compatibility against aggressive media. The sensor is sealed against the pressure port depending on the nominal pressure range with FKM or NBR seals as standard. Other elastomers are available. pressure ports in stainless steel, PVC, or PVDF accuracy: 0.25 % FSO BFSL (0.5 % FSO IEC 60770) nominal pressure ranges from 0 ... 160 mbar up to 0 ... 60 bar ceramic sensor without oil-filling with high resistance against aggressive media, e.g. acids and lyes small thermal effects good long term stability option Ex-version: (only for 4 … 20 mA / 2-wire) TÜV 03 ATEX 2006 X customer specific versions: - special pressure ranges Screw-in Transmitter

Technical Data Input pressure range Pressure port Nominal pressure gauge [bar] Level [mWC] Permissible overpressure [bar] Output signal / Supply Standard Performance Accuracy Permissible load current 2-wire: current 3-wire: voltage 3-wire: Rmax = [(VS – VS min) / 0.02] Ω Rmax = 500 Ω Rmin = 10 kΩ Influence effects supply: load: Response time Thermal effect Thermal error for offset and span in compensated range Electrical protection Short-circuit protection Reverse polarity protection no damage, but also no function Electromagnetic compatibility emission and immunity according to EN 61326...

Technical Data Mechanical connection Connector DIN 43650 Seal Seal With PVC and PVDF versions total length increases by 3 mm (G3/4“) or by 3.5 mm (G1 1/2“) ! G3/4” with Ex-protection: total length increases by 17.5 mm! Electrical connection Standard different cable types and lengths available standard: 2 m PVC cable (without ventilation tube), optionally cable with ventilation tube for gauge pressure up to 40 bar cable with ventilation tube required Cable gland

Technical Data Materials Pressure port / housing pressure port G 3/4" standard: stainless steel 1.4571 (316Ti)/ stainless steel 1.4301 (304) options 10: PVC grey / PVC grey PVDF / PVDF Seals (media wetted) PN ≤ 25 bar: FKM / EPDM PN > 25 bar: NBR others on request Media wetted parts pressure port, seals, diaphragm pressure port G1 1/2" standard: stainless steel 1.4571 (316Ti)/ stainless steel 1.4305 (303) options: PVC grey / PVC grey PVDF / PVDF Miscellaneous Cable capacitance 11 cable without air tube: cable with air tube: signal line/shield: 160 pF/m signal line/shield: 150 pF/m signal...