Product overview
HM27 series vacuum / absolute pressure transmitter is a new series of products launched by German HELM in China specializing in vacuum measurement control, completely solving the problem of vacuum measurement difficulty, the series of products are divided into HM27G negative pressure transmitter, HM27A absolute pressure transmitter, HM27CA capacitive film absolute pressure transmitter three specifications, has been widely used in pharmaceutical, medical equipment, scientific research, leak detection, automation equipment supporting and other fields.
HM27G negative pressure transmitter is the use of HELM single crystal silicon thick film sensor, with high-precision signal processing circuit, stable performance, reliable, to solve the domestic diffusion silicon negative pressure vacuum products signal instability, service life is not long and other deficiencies, commonly used range: 0--100KPa; 0—-50KPa, etc.
HM27A absolute pressure transmitter is the use of German HELM advanced absolute pressure chip and temperature self-compensation and normalization circuit debugging and other high and new technology, the absolute pressure range is extended to 5KPa, and greatly improve the comprehensive accuracy of the product, the model of advanced technology, excellent performance, reliable quality, small size, and domestic the same type of absolute pressure products have a very big advantage, cost-effective.
HM27CA capacitive film absolute pressure transmitter is the company's latest introduction of German HELM capacitive film gauge technology and international advanced calibration production equipment in the domestic production of vacuum pressure instrument. This product adopts the principle of capacitance change to work, the minimum range can achieve absolute pressure 0.02Pa-200Pa, and the detection is not affected by the type and composition of the detection medium, there is a standard electrical signal output, can be transmitted remotely, easy to microprocessor intelligent control, is an ideal instrument for low vacuum pressure measurement.
Product features
◇All German HELM high-precision sensing elements are selected, and their accuracy can reach up to 0.1%FS
◇Stable and reliable performance
◇It can be used continuously for a long time and has good long-term stability
◇Special requirements can be used to measure corrosive media
◇Strong overload resistance
◇Fast response
◇Can be used in dangerous places, with intrinsic safety explosion-proof typeEx iaⅡ CT5
◇Diversified structure, personalized design according to special requirements of customers
Performance parameters
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Measuring medium
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and316Stainless steel compatible gases or liquids
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Type of pressure
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Negative gauge pressure (G） Silicon absolute pressure (A） Capacitive film absolute (CA）
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Overload capacity
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The negative gauge pressure is 2times, the absolute pressure of the micro-range is ten times to 100 times
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Measuring range
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Negative gauge pressure：0~-5KPa .. -50KPa...-100KPa
siliconstylebreak offpress：0~5KPa.....10KPa ... 20KPa... 100KPa... 200KPa... 1MPa
Capacitive film absolute pressure:0.02Pa~200Pa、1Pa~1KPa
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Comprehensive accuracy
(nonlinear, repeated, hysteresis)
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±0.1%FS
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±0.25%FS
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±0.5%FS
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Long-term stability
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Typical: ±0.1%FS/year
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Maximum: ±0.15%FS/year
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Zero temperature drift
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Typical: ±0.01%FS/℃
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Maximum: ±0.15%FS/℃
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Sensitivity, temperature drift
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Typical: ±0.01%FS/℃
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Maximum: ±0.15%FS/℃
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Operating temperature
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-20～85℃
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Compensate for temperature
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-10～60℃
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Ambient temperature
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-20～80℃-
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Power supply range
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12~36VDC(General24VDC）
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Signal output
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4~20mA/1~5VDC/0~5VDC
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Load resistance
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≤（U-12）/0.02Ω
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resolution
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Infinitesimal (theoretical), 1/100000 (usually)
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Enclosure protection
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Plug type (IP65）； Cable type (IP67）
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Safe and explosion-proof
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Ex iaⅡ CT5
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Vibration error
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≤±0.01%FS（X、Y、Zaxis200Hz/g）
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Response time
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≤2 ms
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