Support

1.What are the typical applications/ services, HLT is suitable?

It is used for clean and clear water and non-aggressive liquids.  

Typical applications involve level measurement of water in reservoirs, tanks, borewells and tube wells.

For real time level measurement and remote monitoring, it can be integrated with wireless /IIoT units.

2.What is material of construction?

The probe MOC is SS316 and cable PE insulated copper wire with PUR jacket.

3.What is maximum range of the transmitter?

0.5 mtr to 200 mtrs water cloumn (longer range on demand)

4.What is protection of probe?

IP68

5.What output signals are available?

• 4–20 mA
• 4-20 mA with HART (Highway Addressable Remote Transducer)

6.What is the maximum temperature and pressure limits?

Max. Temperature – 70 °C;  Max Pressure -   Atmospheric

7.Does the measurement affected by liquid density?

• Yes. Hydrostatic pressure depends directly on liquid density (specific gravity). Refer transmitter working.
• Accurate level measurement requires the density to be known and stable.

8.Can it be used in pressurized tanks?

• No.
• Hydrostatic transmitters are designed for atmospheric pressure applications only.

9.What is the accuracy of a hydrostatic level transmitter?

• Typical accuracy is ±0.5 % of full scale.

10.Does it require calibration?

• No.
• Transmitters are factory-calibrated for the specified measuring range and liquid density.

11.Is it suitable for corrosive or hazardous environments?

• No. Standard models are suitable for safe area applications only.
• For corrosive liquids, special material selection is required.

12.Can it measure interface levels (between two liquids)?

• No.
• Hydrostatic transmitters measure total liquid column pressure, not interfaces.

13.How does the transmitter work?

Hydrostatic level measurement works on the principle of hydrostatic pressure exerted by liquid column. The pressure exerted by a liquid column at the bottom of a tank is proportional to its height. This pressure is measured by a pressure sensor and compensated with atmospheric pressure via a vent tube, allowing accurate measurement of the liquid level.

Principle of hydrostatic pressure:
P = ρgh
Where:

• P is the pressure
• ρ is the liquid density
• g is the gravitational constant
• h is the height of the liquid column

14.What is submersible and non- submersible transmitter?

Submersible Type Hydrostatic Transmitter

• As name suggest, The probe is mounted from the tank top and submerged down to the bottom of the tank.
• The transmitter is supplied with a probe sealed to a cable that contains a vent tube.
• The cable length is provided to match the measuring range.
• For easier installation, the transmitter can be provided with a flange connection and a terminal enclosure.

Non-Submersible Type Hydrostatic Transmitter

• This design is side-mounted on the tank wall.
• The sensor measures hydrostatic pressure without being fully submerged.
• Suitable for applications where direct immersion is not practical

15.How it is installed on tank?

Submersible Type Hydrostatic Transmitter

• Installed from the top of the tank.
• If supplied with an open-ended cable, the probe should be secured using a suitable clamp
• The cable wires are terminated in a weatherproof junction box for further connection.
• For easier installation, the transmitter can be provided with a flange connection along with a weatherproof terminal enclosure, allowing safe and convenient wire termination.

Non-Submersible Type Hydrostatic Transmitter

• Installed from the side of the tank near the bottom or directly at the tank bottom.
• This design avoids full immersion of the probe and is suitable where side mounting is more practical.
• Transmitter is provided with DIN plug connection or open ended cable for further termination.

16.What information is required to get a quotation quickly?

• Tank details: height/depth, measuring range
• Mounting type: process connection, side/top/bottom mounting
• Liquid and its specific gravity.
• Liquid properties: corrosive nature, presence of suspended particles or slurry
• Operating conditions: maximum temperature & pressure, agitation or turbulence in liquid
• Area classification: safe or hazardous

17.What are common causes of failure?

• Sensor clogging in dirty or viscous liquids
• Corrosion due to incompatible liquid
• Cable damage (in submersible types) or improper termination in junction box
• Incorrect density assumption

18.What maintenance is required?

• Routine inspection and cleaning of the sensor
• Checking cable and seals for damage
• Periodic calibration verification for long-term reliability