Click Close


阿里巴巴品牌店


天猫旗舰店

631349229

400-063-9658

cccc.jpg

TOP

中文ENGLISH
Location: Home>Products Introduction>Liquid

HM21 Throwing - in Liquid Level Transducer

Description

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

Details

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

IP68 

Safe explosion - proof

Ex ia II CT5

Response time

≤ 2ms

Weight

Approx. 250g

Thermal lagging

 ± 0.1% FS (Typical)

Resolution

Infinite small (theoretical) 1 / 100000 (general)

Product selection

HM21

Throwing - in Liquid Level Transducer

 

Guideline of Selection

Throwing - in Liquid Level Transducer

 

Range

Measuring Range

 

0 ~ X mH2O or 0 ~ X KPa

 

 

 

Code

Structural form (maximum range of operating scale)

 

 

 

C1

Integrated: (0 ~ 200mH2O)

 

 

 

C2

Split:  (0 ~ 10mH2O)

 

 

 

C3

Inserted;  (0 ~ 4mH2O)

 

 

 

 

 

Code

Overall accuracy (linear + repeatability + lagging)

 

 

 

 

 

0

 ± 0.1% FS

 

 

 

 

 

1

 ± 0.4% FS

 

 

 

 

 

2

 ± 0.25% FS

 

 

 

 

 

 

 

Code

Signal Output

 

 

 

 

 

 

 

A1

4 ~ 20mA(12 ~ 36V DC)

 

 

 

 

 

 

 

V1

1 ~ 5V(12 ~ 36V DC)

 

 

 

 

 

 

 

V2

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

 

 

 

 

 

 

 

S1

RS485

 

 

 

 

 

 

 

 

 

Code 

Additional functions

 

 

 

 

 

 

 

 

 

F1

M20 x 1.5 external thread

 

 

 

 

 

 

 

 

 

F2

G 1 / 4 external thread

 

 

 

 

 

 

 

 

 

F0

Special

 

 

 

 

 

 

 

 

 

E

Intrinsically safe explosion - proof type Ex ia II CT5

 

 

 

 

 

 

 

 

 

R

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.

bottom-nav_01.png

主要产品:
HM10 High - accuracy Pressure Sensor |HM31 Differential Pressure Transducer |HM20 General - type Pressure Transducer Description |HM22 High - accuracy Pressure Transducer |HM23Y Special Pressure Transducer for Oilfield and Mining Well |HM27 Vacuum / Absolute Pressure Transducer |HM29 Digital • Intellectual Pressure / Differential Pressure Transducer |HM50 Anti - corrosive Pressure Transducer |HM60 Anti - explosive Pressure Transducer |HM70 Hygienic Flat - membrane Pressure Transducer |HM80 High - temperature Pressure Transducer |HM90 High - frequency Dynamic Pressure Transducer |HM91 Micro Pressure Sensor and Transducer |