HLM–16N,25N Dinel-Hydrostatic Level Meter

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  • Precise customer choice of the measurement range up to 200 m (H2O)
  • Current output
  • Inside probe overvoltage protection
  • Easy “plug and play” installation without any settings
  • For continuous measurement of nonaggressive liquids in non-pressurized tanks, wells, wells, etc.


Technical specification
  HLM–16N HLM–25N
Supply voltage (current/voltage output) 10 … 30 V DC / – 10 … 30 V DC / 15 … 30 V DC
Type Output 4 … 20 mA 4 … 20 mA or 0 … 10 V
Pressure permissible overload range 1 m H2O 10x range 40x range
range 4 m H2O 25x range
other ranges 10x range
Basic error (of the total range) range 1 m H2O 0,5 % 0,6 %
  range 4 m H2O 0,3 %
  other ranges 0,2 %
Hysteresis, repeatability  0,05 %
Long-term stability 0,1 % / Year or 1 cm H2O / Year
Temperature error max. 0,04 % / K
Compensated temperature range (standard)  0 … +25 °C
Ambient temperature range (medium temperature) Ranges > 20 m H2O 0 … +50 °C -25 … +75 °C
Ranges ≤ 20 m H2O -25 … +50 °C
Maximal load resistance (for U = 24 V)  Rmax= 675 Ω
Protection class  IP68
Used materials Probe housing AISI 316L AISI 316L
Membrane AISI 316L Hastelloy C-276
Hanging loop stainless steel
Cable isolation polyurethane polyurethane
Weight (without cable)  a 0,45 kg cca 0,6 kg

Electrical Connection

The sensor is connected to the evaluation (control, display) units through the connecting cables. The connection scheme is shown in the pictures. Electrical connections must be always done in a voltage-free state! The power supply unit must be a source of safe voltage which can be a part of the evaluation or display device.

Range of Application

For continuous measurement of water level even slightly contaminated without coarse impurities in pressureless tanks, boreholes, wells, sumps, reservoirs, and swimming pools. The measured water should be chemically neutral (pH 7.2 – 7.6) and should not contain increased amounts of chlorine. If the water is not chemically neutral, foreign bodies made of other metallic materials (especially copper or brass) must not be placed in the measured space. Failure to follow these guidelines may result in corrosive damage to the stainless steel sensor housing. The suitability of using the level meter for measuring liquids other than water must be consulted with the manufacturer.

Installation Instruction

  • Installation is done by hanging the probe down into the measured area (tanks, boreholes). The probe is left hanging on the cable or placed on the bottom. If the probe is hung deeper than 100m, it is necessary to use a hanging hanger (only for type HLM–25N) or cable hanger KD-60.
  • The cable includes air compensation tubing (capillary), so the connection must be done in the non-hermetic junction box.
  • When wounding up the cable in the bundle it must have a minimum diameter of 30 cm. The cable is not recommended to be shortened or otherwise mechanically modified.
  • In tanks where there are strong turbulences or waves, the probe should be placed in the stilling tube, behind the wall, or at least at the maximum possible distance from the source of turbulence.
  • When using other liquid than water it is needed to make the output correction with respect to the density of the liquid, eventually, consult the application with the manufacturer


  • Cable hanger KD–60
  •  Nehermetic connection box NB

Safety, Protection, and Compatibility

Level meter HLM is equipped with protection against voltage polarity reversal, protection against current overload and protection against short-term overvoltage. Protection against dangerous contact is provided by low safety voltage according to 33 2000-4-41. Electromagnetic compatibility is provided by conformity with standards EN 55022/B, EN 61000-4-2 to 6

Packaging, Shipping, and Storage

The HLM device is supplied and packaged in a cardboard box that protects it against mechanical damage. When handling and during transport, it is necessary to prevent impacts and falls. The HLM electrical device must be stored in dry enclosed areas with humidity up to 85%, free of aggressive vapors at temperatures between -25°C and 70°C, and must be protected against the effects of weather.

Reference: inaparts.com

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