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      Location: Home>Products Introduction>Liquid

      HM21 Throwing - in Liquid Level Transducer


      Measurement of water or liquid level using fluid statically mechanics principle is an important application of pressure sensor. The high–sensitivity silicon piezoresistive sensitive element fabricated with micro machining technology is the critical component of the liquid level sensor, supported with the special cable provided with air venting conduit as well as special water–tightness technology, which ensure water tightness of immersing–type sensor and make the reference pressure chamber connecting with the ambient atmosphere so as to attain accurate results of measurement and excellent stability. HM21 throwing - in liquid level transducer adopts internationally advanced dry ceramic capacitor sensor or temperature–compensating isolating–membrane diffusing silicon pressure sensor made by German HELM as a sensing element to greatly enhance operating performance of the product. It is widely used for measurement and control of water and liquid level for such fields as petroleum, chemical, power generation plant, urban water drainage, hydrographic survey and investigation etc.

      Features of Product

      ☆ Split type: The section of the sensor throwing into the liquid is of fully–sealed stainless steel structure, of which enclosure for the electronic wiring circuit is cast aluminum structure for purpose of alignment and adjustment of wiring connection. 

      ☆ Integrated type: Both the sensor and the amplified circuit are provided in the fully–sealed enclosure made of stainless steel, without external alignment and adjustment. 

      ☆ The enclosure of the sensor is designed with IP68 and the junction box is designed with IP65. 

      ☆ This product takes the high–performance pressure sensor as the measuring element, with high accuracy, small dimensions, easy operation, strong disturbance immunity, high reliability, good stability, high sensitivity, waterproof, and dewing resistance. 

      ☆ It is of free maintenance, easy installation and commissioning. It is directly thrown into the water to measure the liquid level from the transducer end to the liquid surface.

      Application of Product


      Measuring range

      0 ~ 0.5m…200mH2O    or 0 ~ 5KPa…2MPa

      Permissible over pressure

      Two times of full–scale pressure

      Medium to be measured

      The gas or liquid compatible with 316 stainless steel,  corrosion–proof type subject to special    conditions

      Overall accuracy
                 (Linear, repeatability, lagging)

       ± 0.25% FS 

       ± 0.4% FS

       ± 1% FS

      Long-term stability

      Typical:  ± 0.1% FS    

      Maximum:  ± 0.2% FS

      Range of operating temperature

      Integrated: - 20℃~70℃

      Split: - 20℃~80℃

      Range of compensating temperature

      Integrated: - 10℃~55℃

      Split: - 10℃~70℃

      Zero point temperature drifting

      Typical:  ± 0.02% FS 

      Maximum: ± 0.05% FS 

      Full–scale temperature drifting

      Typical: ± 0.02% FS

      Maximum:  ± 0.05% FS

      Range of power supplying

      12 ~ 36V DC( generally 24V DC)

      Signal output

      4~20mA    / 1 - 5V DC / 0~5V DC

      Load resistance

      ≤(U - 12) / 0.02Ω

      Material of structure

      Enclosure: Stainless steel 1Cr18Ni9N

      Membrane: Stainless steel 316L

      Sealing: Fluorubber

      Cable: ¢7.2mm PVC, special

      Insulation resistance

      100MΩ, 500V DC

      Protection degree


      Safe explosion - proof

      Ex ia II CT5

      Response time

      ≤ 2ms


      Approx. 250g

      Thermal lagging

       ± 0.1% FS (Typical)


      Infinite small (theoretical) 1 / 100000 (general)

      Product selection


      Throwing - in Liquid Level Transducer


      Guideline of Selection

      Throwing - in Liquid Level Transducer



      Measuring Range


      0 ~ X mH2O or 0 ~ X KPa





      Structural form (maximum range of operating scale)





      Integrated: (0 ~ 200mH2O)





      Split:  (0 ~ 10mH2O)





      Inserted;  (0 ~ 4mH2O)







      Overall accuracy (linear + repeatability + lagging)







       ± 0.1% FS







       ± 0.4% FS







       ± 0.25% FS









      Signal Output









      4 ~ 20mA(12 ~ 36V DC)









      1 ~ 5V(12 ~ 36V DC)









      0 ~ 5V DC(12 ~ 36V DC)




















      Additional functions











      M20 x 1.5 external thread











      G 1 / 4 external thread






















      Intrinsically safe explosion - proof type Ex ia II CT5











      Corrosion - proof type













      HM21( 0 ~ 10mH2O)

       —C 1

      — 1

      — A1



      — E

      Throwing - in Liquid Level Transducer

      Tips of Selection

            The medium to be measured shall be compatible with the material contacting with the product. Meanwhile, it is needed to be indicated with density of the medium to be measured under the measuring status (except for water). The F1, F2, and F0 shown as the additional functions are only suitable for split–type liquid level transducer and inserted–type liquid level transducer. The code E, an additional functional code for selection, and intrinsically safe explosion-proof Ex ia II CT5 must be power supplied via safety barrier. The length of cable shall be L = X m + 1m. Please indicate for extension when placing an order. Selection of HM21F lightning liquid level transducer made when placing an order when the product is installed in thundering areas. The corresponding relationship of 1m water column under standard condition ( i.e. 4℃, g = 9.80665 m / s2) shall be 1 mH2O = 0.1kgf / cm2 = 9.8kPa Please contact us in case of the other special requirements and clearly indicate them when placing an order.


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