SITRANS LH300, transmitter for hydrostatic level

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The pressure transmitter SITRANS LH300 is a submersible sensor for hydrostatic level measurement with cap made of PPE (left), stainless steel (mid) and ETFE (right).

The pressure transmitter measures the liquid levels in tanks, containers, channels and dams. The SITRANS LH300 pressure transmitters are available for various measuring ranges and with explosion protection as an option.

A junction box and a cable hanger are available as accessories for simple installation.

Область применения

SITRANS LH300 pressure transmitters are used in the following branches, for example:

Shipbuilding
Water/waste water supply
Drinking water facilities
For use in unpressurized/open vessels and wells
Desalination plants

Дизайн

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.

The sensor, the electronics and the connecting cable are housed in an enclosure with small dimensions.

The pressure transmitter is temperature-compensated for a wide temperature range.

Функции

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 condensation 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.

Интеграция

It is generally recommended that the connecting cable of the SITRANS LH300 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, but outside the media.

If the medium is anything other than water, it is also necessary to check compatibility with the specified materials of the transmitter, cable and gasket.

Junction box 7MF1575-8AA, open, schematic diagram

Measuring point setup, generally with junction box 7MF1575-8AA and 7MF1575-8AB cable hanger

Чертеж

SITRANS LH300 pressure transmitter, dimensions in mm (inch)

Junciton box, dimensions in mm (inch)

Cable hanger, dimensions in mm (inch)

Особенности

Compact design
Simple installation
Small error in measurement (0.15 % typical)
Degree of protection IP68

Технические данные

Pressure transmitter SITRANS LH300 (submersible sensor)
Mode of operation
Measuring principle	Piezo-resistive
Input
Measured variable	Hydrostatic level
Measuring range	Max. permissible operating pressure
0 ... 1 mH₂O (0 ... 3 ftH₂O)	1.5 bar (21.8 psi) (corresponds to 15 mH₂O (45 ftH₂O))
0 ... 2 mH₂O (0 ... 6 ftH₂O)	1.5 bar (21.8 psi) (corresponds to 15 mH₂O (45 ftH₂O))
0 ... 3 mH₂O (0 ... 9 ftH₂O)	1.5 bar (21.8 psi) (corresponds to 15 mH₂O (45 ftH₂O))
0 ... 4 mH₂O (0 ... 12 ftH₂O)	2 bar (29 psi) (corresponds to 20 mH₂O (60 ftH₂O))
0 ... 5 mH₂O (0 ... 15 ftH₂O)	2 bar (29 psi) (corresponds to 20 mH₂O (60 ftH₂O))
0 ... 6 mH₂O (0 ... 18 ftH₂O)	2 bar (29 psi) (corresponds to 20 mH₂O (60 ftH₂O))
0 ... 10 mH₂O (0 ... 30 ftH₂O)	5.0 bar (72.5 psi) (corresponds to 50 mH2O (150 ftH2O))
0 ... 20 mH₂O (0 ... 60 ftH₂O)	10.0 bar (145 psi) (corresponds to 100 mH₂O (300 ftH₂O))
0 ... 40 mH₂O (0 ... 120 ftH₂O)	20.0 bar (290 psi) (corresponds to 200 mH₂O (600 ftH₂O))
Special measuring range
Up to 100 mH₂O (0 ... 300 ftH₂O)	20.0 bar (290 psi) (corresponds to 200 mH₂O (600 ftH₂O))
Up to 160 mH₂O (0 ... 480 ftH₂O)	24.0 bar (348 psi) (corresponds to 348 mH₂O (720 ftH₂O))
Measuring range
0 ... 0.1 bar	1.5 bar
0 ... 0.2 bar	1.5 bar
0 ... 0.3 bar	1.5 bar
0 ... 0.4 bar	2 bar
0 ... 0.5 bar	2 bar
0 ... 0.6 bar	2 bar
0 ... 1 bar	5 bar
0 ... 2 bar	10 bar
0 ... 4 bar	20 bar
Special measuring range
Up to 10 bar	20 bar
Up to 16 bar	24 bar
Output
Output signal	4 ... 20 mA
Measuring accuracy	According to IEC 60770-1
Error in measurement at limit setting including hysteresis and reproducibility	≤ 0.15 % of full-scale value (typical) ≤ 0.3 % of full-scale value (maximum)
Influence of ambient temperature	≤ 0.05 %/10 K of full-scale value (zero and span)
Long-term stability	≤ 0.15 % of full-scale value/year (zero and span)
Rated conditions
Ambient conditions
Process temperature	-10 ... +80 °C (14 ... 176 °F)
Storage temperature	-20 ... +80 °C (-4 ... +176 °F)
Degree of protection according to IEC 60529	IP68
Design
Weight
Pressure transmitter	≈ 0.4 kg ( ≈ 0.88 lb)
Cable	0.08 kg/m (≈ 0.059 lb/ft)
Electrical connection	Cable with 2 conductors, vent pipe and integrated humidity filter
Material
Seal diaphragm	Al₂O₃ ceramic, 99.6%
Enclosure	Stainless steel, mat. no. 1.4404/316L and 1.4539/904L (sea water applications) respectively
Gasket	FPM (standard) EPDM (optional)
Connecting cable	PE (standard/drinking water applications) FEP (for aggressive media)
Cap	Stainless steel, PPE or ETFE
Auxiliary power
Terminal voltage on pressure transmitter U_B	10 ... 33 V DC 10 ... 30 V DC for transmitter with intrinsic safety explosion protection
Certificates and approvals
Drinking water approval (ACS)	Pending
Drinking water approval (WRAS)	Pending
Drinking water approval (DVGW/KTW W270)	Pending
EAC /EAC-Ex	№ TC RU C-DE.ГБ05.В.00358 OC НАНИО «ЦСВЭ»
Underwriters Laboratories (UL)	Pending
Shipbuilding approval (LR)	Pending
Shipbuilding approval (DNV/GL)	Pending
Shipbuilding approval (BV)	Pending
Shipbuilding approval (ABS)	Pending
Pressure equipment directive	The device is not subject to the pressure equipment directive (PED 2014/68/EU)
Explosion protection
IEC Ex ATEX EAC Ex	SEV 16 ATEX 0121 IEC Ex SEV 16.0003
Intrinsic safety "i"
Marking	II 1 G Ex ia IIC T4 Ga

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 M20x1.5
Enclosure material	Polycarbonate
Vent pipe for atmospheric pressure
Screw for cable strength cord
Rated conditions
Degree of protection according to IEC 60529	IP65

Cable hanger
Application	For mounting the transmitter
Design
Weight	0.16 kg (0.35 lb)
Material	Galvanized steel, polyamide

Дальнейшая информация

Determination of the measuring range for medium water

Calculation of the measuring range:

p = ρ x g x H

with:

ρ = density of medium

g = local acceleration due to gravity

H = maximum level

Example:

Medium: Waterl, ρ = 1000 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:

p = 1000 kg/m³ x 9.81 m/s²x 6.0 m

p = 58 860 N/m²

p = 589 mbar

Transmitter to be ordered:

7MF1575-1FA10

Plus, if required, junction box 7MF1572-8AA and cable hanger 7MF1572-8AB