Daniel HLM–16-25 Hydrostatic Level Meter is a compact measuring device containing the ceramic geometric sensor and evaluation electronics in stainless steel probe. From the probe, the housing comes out 2-wire cable with a capillary (for atmospheric pressure compensation). The opposite end of the investigation is equipped with a stainless discharge cap to prevent mechanical damage to the membrane.
The HLM-25 type has a supporting suspension tab for easy mounting at large depths. The level meter has no customer-accessible adjusting elements.
Dinel HLM–16-25 Features
- 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.
Specifications
| 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 | 0,50% | 0,60% |
| range 4 m H2O | 0,30% | ||
| other ranges | 0,20% | ||
| 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
Accessories
- 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.
Download Catalog: Hydrostatic level meter HLM–16N,25N
Reference: dinel.cz
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