© Siemens AG 2015 Pressure Measurement Transmitters for basic requirements SITRANS LH100 Transmitter for hydrostatic level ■ Overview ■ Function 1 U const. 5 U I p EM The pressure transmitter SITRANS LH100 is a submersible sensor for hydrostatic level measurement. 3 4 The pressure transmitter measures the liquid levels in tanks, containers, channels and dams. The SITRANS LH100 pressure transmitters are available for various measuring ranges and with explosion protection as an option. 1 Sensor 4 2 5 A junction box and a cable hanger are available as accessories for simple installation. 3 Connection for auxiliary power supply Vent pipe with humidity filter ■ Benefits • • • • Compact design Simple installation Small error in measurement (0.3 %) Degree of protection IP68 ■ Application SITRANS LH100 pressure transmitters are used in the following branches, for example: • Shipbuilding • Water/waste water supply • For use in unpressurized/open vessels and wells ■ Design The pressure transmitter has a built-in ceramic sensor which is equipped with a Wheatstone resistance bridge. These pressure transmitters are equipped with an electronic circuit fitted together with the sensor in a stainless steel housing. In addition, the connecting cable contains a vent pipe which is equipped with a humidity filter to prevent the build-up of condensation. The diaphragm is protected against external influences by a protective cap. 2 Protective conductor connection/ Equipotential bonding Diaphragm SITRANS LH100 pressure transmitter, mode of operation and connection diagram On one side of the sensor (1), the diaphragm (5) is exposed to the hydrostatic pressure which is proportional to the submersion depth. This pressure is compared with atmospheric pressure. Pressure compensation is carried out using the vent pipe (3) in the connecting cable. The vent pipe is equipped with a humidity filter which prevents the build-up of condenstation in the vent pipe. The hydrostatic pressure of the liquid column acts on the diaphragm of the sensor and transmits the pressure to the Wheatstone resistance bridge in the sensor. The output voltage of the sensor is applied to the electronic circuit where it is converted into an output current of 4 to 20 mA. The protective conductor connection/equipotential bonding (4) is connected to the enclosure. ■ Integration It is generally recommended that the connecting cable of the SITRANS LH100 transmitter is connected to the junction box, which can be ordered separately, and secured with the cable hanger, also available separately. The junction box has to be installed near the measuring point. If the medium is anything other than water, it is also necessary to check compatibility with the specified materials of the transmitter. The sensor, the electronics and the connecting cable are housed in an enclosure with small dimensions. Venting pipe The pressure transmitter is temperature-compensated for a wide temperature range. To transmitter 7MF1572 To measuredvalue processing Junction box 7MF1572-8AA, open, schematic diagram Siemens FI 01 · 2015 US Edition 1/27 1 © Siemens AG 2015 Pressure Measurement Transmitters for basic requirements 1 SITRANS LH100 Transmitter for hydrostatic level Long-term stability Zero and span • 4 ... 6 mH2O (12 ... 18 ftH2O or 0.4…0.6 bar) • 6 mH2O ( 18 ftH2O or 0.6 bar) 0.25% of full-scale value/year 0.2 % of full-scale value/year Rated conditions Ambient conditions • Process temperature • Storage temperature Degree of protection according to IEC 60529 -10 ... +80 °C (14 ... 176 °F) -40 ... +80 °C (-40 ... +176 °F) IP68 Design Weight • Pressure transmitter • Cable Electrical connection 0.2 kg ( 0.44 lb) 0.025 kg/m ( 0.015 lb/ft) Cable with 3 conductors, vent pipe and integrated humidity filter Material • Seal diaphragm • Enclosure • Gasket Al2O3 ceramic, 96% Stainless steel, mat. no. 1.4404/316L FPM (standard) • Connecting cable EPDM (optional) PE-HD (standard) PE-LD (in the case of versions with EPDM seal, suitable for drinking water) Auxiliary power Measuring point setup, generally with junction box 7MF1572-8AA and 7MF1572-8AB cable hanger ■ Technical specifications Certificates and approvals Pressure transmitter SITRANS LH100 (submersible sensor) Mode of operation Measuring principle piezo-resistive Input Measured variable Hydrostatic level Measuring range • 0 ... 4 mH2O (0 ... 12 ftH2O) Max. permissible operating pressure • 1.5 bar (21.8 psi) (corresponds to 15 mH2O (45 ftH2O)) • 1.5 bar (21.8 psi) (corresponds to 15 mH2O (45 ftH2O)) • 1.5 bar (21.8 psi) (corresponds to 15 mH2O (45 ftH2O)) • 3.0 bar (43.5 psi) (corresponds to 30 mH2O (90 ftH2O)) • 5.0 bar (72.5 psi) (corresponds to 50 mH2O (150 ftH2O)) • 1.5 bar • 1.5 bar • 1.5 bar • 3.0 bar • 5.0 bar • 0 ... 5 mH2O (0 ... 15 ftH2O) • 0 ... 6 mH2O (0 ... 18 ftH2O) • 0 ... 10 mH2O (0 ... 30 ftH2O) • 0 ... 20 mH2O (0 ... 60 ftH2O) • • • • • 0 ... 0.4 bar 0 ... 0.5 bar 0 ... 0.6 bar 0 ... 1 bar 0 ... 2 bar Terminal voltage on pressure transmit- 10 ... 33 V DC ter UB 10 ... 30 V DC for transmitter with intrinsic safety explosion protection Drinking water approval (ACS) 1403525 Drinking water approval (WRAS) applied for GOST applied for Underwriters Laboratories (UL) applied for The transmitter is not subject to the pressure equipment directive (PED 97/23/EC) Explosion protection • Intrinsic safety "i" - Marking Junction box Application for connecting the transmitter cable Design Weight 0.2 kg (0.44 lb) Electrical connection 2 x 3-way (28 to 18 AWG) Cable entry 2 x Pg 9 Enclosure material polycarbonate Vent pipe for atmospheric pressure Output Output signal 4 ... 20 mA Screw for cable strength cord Measuring accuracy According to IEC 60770-1 Rated conditions Error in measurement at limit setting 0.3% of full-scale value (typical) including hysteresis and reproducibility Influence of ambient temperature Zero and span • 4 ... 6 mH2O (12 ... 18 ftH2O or 0.4…0.6 bar) • 6 mH2O ( 18 ftH2O or 0.6 bar) 1/28 IECEx SEV 14.0003 SEV 14 ATEX 0109 II 1 G Ex ia IIC T4 Ga Degree of protection according to IEC 60529 Cable hanger Application 0.45 %/10 K of full-scale value 0.3 %/10 K of full-scale value Siemens FI 01 · 2015 US Edition IP65 for mounting the transmitter Design Weight 0.16 kg (0.35 lb) Material Galvanized steel, polyamide © Siemens AG 2015 Pressure Measurement Transmitters for basic requirements SITRANS LH100 Transmitter for hydrostatic level Selection and ordering data Article No. Order code Pressure transmitter SITRANS LH100 (submersible sensor) 7 MF 1 5 7 2 - 77A77 777 For measurement of the hydrostatic level through submersion, two-wire system, 4…20 mA, enclosure material mat. no. 1.4404 (316L), measuring cell Al2O3 ceramic, with permanently mounted PE cable Click on the Article No. for the online configuration in the PIA Life Cycle Portal. Measuring range 0 ... 4 mH2O 0 ... 5 mH2O 0 ... 6 mH2O 0 ... 10 mH2O 0 ... 20 mH2O Cable length 10 m 10 m 10 m 20 m 30 m 1D 1E 1F 1H 1K 0 ... 12 ftH2O 0 ... 15 ftH2O 0 ... 18 ftH2O 0 ... 30 ftH2O 0 ... 60 ftH2O 33 ft 33 ft 33 ft 66 ft 98 ft 2D 2E 2F 2H 2K 0 ... 0.4 bar 0 ... 0.5 bar 0 ... 0.6 bar 0 ... 1 bar 0 ... 2 bar 10 m 10 m 10 m 20 m 30 m 3D 3E 3F 3H 3K Additional versions Order code Quality inspection certificate (factory calibration) acc. to IEC 60770-2, add "-Z" to article no. and add order code. C11 Indication of measuring range (only at special cable lengths) in "... to ... mH2O" or "... to ... ftH2O" or "... to ... bar" Y01 Accessories/spare parts Article No. Junction box for connecting the transmitter cable 7MF1572-8AA Cable hanger for securing the pressure transmitter 7MF1572-8AB Protective caps as spare parts (10-pack) 7MF1572-8AD Humidity filters as spare parts (10-pack) 7MF1572-8AE Special versions: Measuring ranges for special versions between 0 ... 4 mH2O and 0 ... 30 mH2O or 0 ... 12 ftH2O and 0 ... 90 ftH2O or 0 ... 0.4 bar and 0 ... 3 bar possible. Special cable lenght/Special measuring range Please add „-Z“ to Article No. and specify Order code and plain text. Note: Indication of measuring range Y01 is always necessary. 9A H. . + Y01 For evaluation of the maximum possible cable length following data have to be regarded: Transmitter: Ci = 0 µF, Li = 0 µH Cable: Ck = 0.19 nF per meter cable Lk = 1.5 µH per meter cable The maximum permitted data of the transmitter’s power supply have to be considered! 3 m (10 ft) 5 m (16 ft) 7 m (23 ft) 10 m (33 ft) 15 m (49 ft) H1A H1B H1C H1D H1E 20 m (66 ft) 25 m (82 ft) 30 m (98 ft) 40 m (131 ft) 50 m (164 ft) H1F H1G H1H H1 J H1K Sealing material between sensor and enclosure • FPM (Standard) • EPDM (for drinking water applications) Explosion protection • without • With ATEX II1 G Ex ia IIC T4 Ga and IECEx Ex ia IIC T4 Ga 1 2 0 1 Siemens FI 01 · 2015 US Edition 1/29 1 © Siemens AG 2015 Pressure Measurement Transmitters for basic requirements SITRANS LH100 Transmitter for hydrostatic level ■ Dimensional drawings ■ More information ~116.3 (4.58) 2 1 3 Determination of the measuring range for media with a density of 1000 kg/m3 (medium water) Ø23.4 (0.92) 4 5 6 1 Cable, sheat Ø 4.8 (0.19) (black, PE) 2 - (green) 3 + (brown) 4 Protective conductor connection/Equipotential bonding (white) 5 Vent pipe with humidity filter Ø 1 (0.04) (inner diameter) 6 Protective cap with 4 x Ø 2.5 (0.10) holes (black, PPE) H r SITRANS LH100 pressure transmitter, dimensions in mm (inch) 52 (2.05) 37 (1.46) 17 (0.07) 30 (1.2) 3 1 Calculation of the measuring range: p=xgxH 86 (3.39) 2 86 (3.39) with: = density of medium 30 (1.2) g = local acceleration due to gravity 17 (0.07) 64 (2.52) 1 Fastening hole 2 Vent valve 3 Cable gland Pg 9, cable diameter 4 ... 8 mm (0.16 ... 0.31) H = maximum level Example: Medium: Diesel fuel, = 850 kg/m3 Acceleration due to gravity: 9.81 m/s2 Start-of-scale: 0 m Maximum level: 6.0 m Cable length: 10 m Calculation: Junction box, dimensions in mm (inch) p = 850 kg/m3 x 9.81 m/s2 x 6.0 m 19 (0.75) p = 50 031 N/m2 p = 500 mbar Transmitter to be ordered: 7MF1572-1FA11 Plus, if required, junction box 7MF1572-8AA and cable hanger 7MF1572-8AB 190 (7.5) 1 48 (1.9) Cable hanger, dimensions in mm (inch) 1/30 Siemens FI 01 · 2015 US Edition