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SITRANS LH100
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SITRANS LH100 is a submersible hydrostatic pressure sensor for level measurement in tanks, basins, channels, and dams. It offers various measuring ranges and includes an optional explosion-proof version for hazardous environments.
Key Features
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Compact design for easy installation
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Simple mounting without the need for complex structural support
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High accuracy with an error margin of only ±0.3% of full scale
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High protection rating IP68, ensuring stable performance in continuous submersion
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Supplied with accessories including cable junction box and mounting clamp for flexible installation
Typical Applications
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Marine industry: level monitoring in storage tanks and bilges
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Water supply and wastewater treatment
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Level measurement in wells, open tanks, and non-pressurized vessels
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Outdoor and continuously wet environments
Design and Construction
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Uses a ceramic sensor with integrated Wheatstone bridge
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Measuring element and electronics fully enclosed in a stainless steel housing
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Vented cable with integrated moisture filter to equalize atmospheric pressure and prevent condensation
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Sensor membrane protected by an impact- and debris-resistant cover
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Equipped with full-range temperature compensation to maintain measurement accuracy under varying environmental conditions
Mode of Operation
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The sensing membrane located at the bottom of the device is exposed to the hydrostatic pressure of the liquid column
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Hydrostatic pressure, proportional to liquid depth, is transmitted to the Wheatstone bridge within the sensor
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Output voltage is processed by internal electronics and converted into a 4–20 mA signal
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The vented cable enables atmospheric pressure equalization, ensuring accurate readings
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Grounding/noise shielding is connected to the device enclosure for improved operational stability and safety
Technical Specifications – SITRANS LH100 (Submersible Sensor)
| Category | Details |
| Mode of Operation | |
| Measuring principle | Piezo-resistive |
| Input | |
| Measured variable | Hydrostatic level |
| Measuring ranges | 0 … 3 mH₂O (0 … 9 ftH₂O) 0 … 4 mH₂O (0 … 12 ftH₂O) 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 … 0.3 bar 0 … 0.4 bar 0 … 0.5 bar 0 … 0.6 bar 0 … 1 bar 0 … 2 bar |
| Max. permissible operating pressure | 1.5 bar (21.8 psi) → for 0–3 to 0–6 mH₂O 3.0 bar (43.5 psi) → for 0–10 mH₂O 5.0 bar (72.5 psi) → for 0–20 mH₂O and higher bar ranges |
| Output | |
| Output signal | 4 … 20 mA |
| Measuring Accuracy | (According to IEC 62828-1) |
| For 0 … 3 mH₂O (0 … 9 ftH₂O or 0 … 0.3 bar) | – Typical: 0.5% of full-scale – Max: 1.0% of full-scale |
| For all other ranges | – Typical: 0.3% of full-scale – Max: 0.6% of full-scale |
| Effect of Ambient Temperature | |
| 0 … 3 mH₂O (9 ftH₂O or 0.3 bar) | 0.45% / 10 K of range end value |
| 4 … 6 mH₂O (12 … 18 ftH₂O or 0.4 … 0.6 bar) | 0.45% / 10 K of range end value |
| > 6 mH₂O (>18 ftH₂O or >0.6 bar) | 0.3% / 10 K of range end value |
| Long-Term Stability | |
| 3 mH₂O (0.3 bar) | 0.4% / year |
| 4 … 6 mH₂O (0.4 … 0.6 bar) | 0.25% / year |
| > 6 mH₂O (>0.6 bar) | 0.2% / year |
| Operating Conditions | |
| Process temperature | –10 … +80 °C (14 … 176 °F) |
| Storage temperature | –40 … +80 °C (–40 … +176 °F) |
| Degree of protection | IP68 |
| Structural Design | |
| Weight (transmitter only) | ≈ 0.2 kg (≈ 0.44 lb) |
| Cable | – Max length: 100 m (330 ft) – Weight: 0.025 kg/m (≈ 0.015 lb/ft) |
| Electrical connection | Cable with 3 conductors, vent pipe, integrated humidity filter |
| Materials | |
| Diaphragm | Al₂O₃ ceramic, 96% |
| Enclosure | Stainless steel, 1.4404 / 316L |
| Gasket | – FPM (standard) – EPDM (optional) |
| Connecting cable | – PE-HD (standard) – PE-LD (with EPDM, for drinking water) |
| Auxiliary Power | |
| Voltage UB | 10 … 33 V DC 10 … 30 V DC (with intrinsic safety) |
| Certificates and Approvals | |
| Drinking water approval (ACS) | ACS 15 ACC NY 360 |
| EAC | № TC RU C-DE.ГБ05.В.00732 |
| UL (USA & Canada) | 2014-11-17 – E344532 |
| PED 2014/68/EU | Not subject to pressure directive |
| Explosion Protection | |
| Intrinsic safety “i” | – IECEx SEV 14.0003 – SEV 14 ATEX 0109 – II 1 G Ex ia IIC T4 Ga – EAC Ex: TC RU C-DE.AA87.B.00324 |
Cable Box (Optional Accessory)
| Category | Details |
| Area of application | For connecting the transmitter cable |
| Weight | 0.2 kg (0.44 lb) |
| Electrical connection | 2 × 3-way (28–18 AWG) |
| Cable entry | 2 × Pg 9 |
| Material | Polycarbonate |
| Venting | Atmospheric pressure vent |
| Protection class | IP65 (IEC 60529) |
Anchoring Clamp (Optional Accessory)
| Category | Details |
| Area of application | For mounting the transmitter |
| Weight | 0.16 kg (0.35 lb) |
| Material | Zinc-plated steel, polyamide |
