Hydrostatic pressure sensor | LHC-M**

Артикул: LHC-M**
Производитель: Pepperl-Fuchs


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  • Hydrostatic pressure sensor for gases, vapors, liquids and dusts
  • High accuracy of measurement
  • Housing fulfils the special hygienic requirements of the foodstuff and pharmaceutical industries
  • Large selection of process connections: universal use
  • Dry capacitive ceramic sensor up to 40 bar
  • Piezoresistive metal sensor for measuring ranges up to 400 bar
  • Wide variety of electronic modules (e. g., relay, thyristor signal output): the right connection for every process control system
  • Process connections acc. to EHEDG
  • Up to SIL2 acc. to IEC 61508

Datasheet as PDF in following languages:


Technical Data: LHC-M**

Application
Function principlesensor for absolute and relative pressure measuring in gases, vapors, liquids and dusts
ceramic sensor (LHC-M20)
The pressure causes a slight deflection of the ceramic diaphragm of the sensor.
The change in the capacitance is proportional to the pressure and is measured by the electrodes of the ceramic sensor, volume of chamber: approx. 2 mm3.
metal sensor (LHC-M40)
The process pressure acting on the metallic separating diaphragm of the sensor is transmitted via a fill liquid to a resistance bridge. The change in the output voltage of the bridge is proportional to the pressure and is then measured, volume of chamber: smaller than 1 mm3.
Function and system design
Equipment architecture- with analogue electronics I2/IB 4 ... 20 mA and auxiliary energy, e. g. via transmitter power pack, calibration across potentiometer for lower range value and upper range value, optionally analogue display for measuring value indication
- with HART electronics IA/IH with current output 4 ... 20 mA, HART communication signal and auxiliary energy, e. g. via transmitter power pack, calibration via two keys on the device, handheld terminal or PC with operating program, optional digital display for measured variable indication
- with PROFIBUS PA electronics PA/PB with digital communication signal PROFIBUS PA and segment coupler for connection to PLC or PC with operating program, optional digital display for measured variable indication
Input characteristics
Measured variableabsolute or relative pressure
Measurement rangesee section measuring range
Output characteristics
Output signalanalog electronics I2/IB: 4 ... 20 mA
HART electronics IA/IH: 4 ... 20 mA with HART protocol
PROFIBUS PA electronics PA/PB: digital communication signal
Auxiliary energy
Electrical connectionconnection cable:
- shielded, twisted pair two-wire cable
- terminals for wire cross-sections 0.14 ... 2.5 mm2
- cable outer diameter: 5 ... 9 mm (0.2 ... 0.35 in)
M12 plug
Harting plug (Han7D)
Supply voltageanalog electronics I2/IB: 11.5 ... 45 V DC
HART electronics IA/IH: 11.5 ... 45 V DC
PROFIBUS PA electronics PA/PB: 9 ... 32 V DC
Version for hazardous area see safety information.
Current consumptionPROFIBUS PA electronics PA/PB: 11 mA ± 1 mA
Operating conditions
Ambient conditions
Ambient temperature-40 ... 85 °C (-40 ... 185 °F)
onsite display with analogue electronics I2/IB: -30 ... 80 °C (243 ... 353 K)
onsite display with HART electronics IA/IH or PROFIBUS PA electronics PA/PB: -25 ... 70 °C (248 ... 343 K)
Lower temperatures minimize the display speed.
Storage temperature-40 ... 100 °C (-40 ... 212 °F)
onsite display: -40 ... 80 °C (233 ... 353 K)
Mechanical specifications
Protection degreeIP66 for devices with cable gland, cable entry
IP68 for devices with assembled cable or M12 plug
Mechanical construction
Dimensionshousings: stainless steel housing 74 x 97 mm (2.9 x 3.8 in), aluminium housing 74 x 117 mm (2.9 x 4.6 in), length depends on process connection and cover
process connections see section dimensions
MassLHC-M20: stainless steel 1.8 kg, aluminium 2.1 kg
LHC-M40: 1.5 ... 16.8 kg, depends from process connection
Materialhousing:
- stainless steel 1.4404/316L or cast aluminium housing with protective polyester based powder coating
nameplates:
- stainless steel housing: engraved on housing with laser
- aluminium housing: 1.4301/304)
process connections (in contact with the medium):
- stainless steel 1.4435/316L
process diaphragm (in contact with the medium):
- LHC-M20: Al2O3 aluminium oxide ceramic (FDA listed), 96 %, extremely clean 99.9 %
- LHC-M40: stainless steel 1.4435/316L, Hastelloy C276, tantalum, PTFE folio 0.09 mm on 1.4435/316L (not for vacuum), PTFE folio 0.25 mm on 1.4435/316L (not for vacuum)
seals:
- FKM Viton (also in versions grease-free and for oxygen use), NBR, FFKM Kalrez, FFKM Chemraz, EPDM
O-ring for cover sealing:
- stainless steel housing: silicone
- aluminium housing: NBR
mounting accessories for pipe and wall mounting:
- stainless steel 1.4301/304
measurement cell:
- LHC-M20: without oil filling, dry sensor,
- LHC-M40: oil filling: optional silicone oil, vegetable oil, glycerine, high temperature oil, fluorolube grease-free for oxygen use
capillary:
- 1.4571/316Ti
protective hose for capillary:
- 1.4301/304
Certificates and approvals
Ex approvalDMT 02 ATEX E 137, DMT 02 ATEX E 138 , for additional certificates see www.pepperl-fuchs.com
Type of protectionEx-Hexagon II 1G EEx ia IIC T4/T6 (DMT 02 ATEX E 137)
Ex-Hexagon II 1/2G EEx ia IIC T4/T6 (DMT 02 ATEX E 137)
Ex-Hexagon II 2G EEx ia IIC T4/T6 (DMT 02 ATEX E 137)
Ex-Hexagon II 1/2D IP66 T50/82°C (DMT 02 ATEX E 137)
Ex-Hexagon II 1/2D IP66 T85°C (DMT 02 ATEX E 137)
Ex-Hexagon II 1/3D IP66 T110°C (DMT 02 ATEX E 138)
Ex-Hexagon II 3 G EEx nA II T5
SIL classificationup to SIL2 acc. to IEC 61508


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