Product catalog
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- HM20 General - type Pressure Transducer Description
- HM22 High - accuracy Pressure Transducer
- HM23 Special Pressure Transducer for Air Conditioner, Refrigerating and Compressor
- HM23Y Special Pressure Transducer for Oilfield and Mining Well
- HM24 Economical Pressure Sensor and Transducer
- HM25 Industrial - type Pressure Transducer
- HM26 Ceramic Capacitor Pressure Transducer
- HM27 Vacuum / Absolute Pressure Transducer
- HM28 Sapphire 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
Contact Us
南京宏沐科技有限公司
銷售部地址：南京市高鐵南站南廣場
電話：400-063-9658
手機：18951963348同微信號
傳真：025-52150140
郵箱：njhongmu@hmsensor.com
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 | ± 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 | |||||||||||||
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| Code | Structural form (maximum range of operating scale) | ||||||||||
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| C1 | Integrated: (0 ~ 200mH2O) | ||||||||||
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| C2 | Split: (0 ~ 10mH2O) | ||||||||||
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| C3 | Inserted; (0 ~ 4mH2O) | ||||||||||
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| Code | Overall accuracy (linear + repeatability + lagging) | ||||||||
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| 0 | ± 0.1% FS | ||||||||
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| 1 | ± 0.4% FS | ||||||||
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| 2 | ± 0.25% FS | ||||||||
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| Code | Signal Output | ||||||
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| A1 | 4 ~ 20mA(12 ~ 36V DC) | ||||||
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| V1 | 1 ~ 5V(12 ~ 36V DC) | ||||||
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| V2 | 0 ~ 5V DC(12 ~ 36V DC) | ||||||
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| S1 | RS485 | ||||||
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| Code | Additional functions | ||||
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| F1 | M20 x 1.5 external thread | ||||
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| F2 | G 1 / 4 external thread | ||||
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| F0 | Special | ||||
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| E | Intrinsically safe explosion - proof type Ex ia II CT5 | ||||
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| R | Corrosion - proof type | ||||
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HM21( 0 ~ 10mH2O) | —C 1 | — 1 | — A1 |
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| — 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.
