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A revolutionary battery-powered multi-parameter tr
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a revolutionary battery-powered multi-parameter transmitter differential pressure flow DMP9051 temperature and pressure sensors integrated automatic temperature and pressure compensation
Development of differential pressure flowmeter
differential pressure flow meter flowmeter market share ratio is very large. Market more is applied plates, nozzles, venturi, bending, bull bar, power bar, wedge, V cone flowmeter, etc.. Differential pressure flowmeter has many advantages, organization is simple, long-term stability, good anti-jamming, shake abilities and so on. However, there are many disadvantages. Mainly using up more trouble, installation trouble, usually installed by differential pressure transmitter, and then with the secondary instrument or computers. Inevitable and causing users to use cumbersome, error-prone, the operation more difficult. Costs are bound to increase. General output is a current, no way to do actual flow calibration for each table. Taiwan does not have a differential pressure flow meter to achieve each be calibrated before shipment. Are relying on calculations to achieve. Inevitably lead to some discrepancies theory and practice, and result in errors. Another important drawback is that the battery can not be self-powered, to achieve micropower. Because a lot of places are unable to provide power. For these situations, we have developed a micro-power battery-powered multi-parameter transmitter differential pressure flow. Integrated design flow and differential pressure sensor is displayed directly flow signal, you can not take power in the case for flow measurement. Fully isolated pulse output can be directly implemented on a table in the calibration flow calibration, the coefficient of feedback to the multi-parameter transmitter. Greatly improve the accuracy of the actual instrument. Get rid of the differential pressure flow calculated by the method of this operation.
one, traditional differential pressure flow measurement system consists of
1. traditional performance differential pressure transmitter
● applies to all differential pressure flow sensor
● can output current (4-20mA)
● turndown ratio 1:10, imports 1:100
● Accuracy 0.1 0.2
● Field displays a single flow
2. traditional differential pressure transmitter and differential pressure flow sensor measuring system consisting of
(1) general type (measuring liquid)
(2) temperature and pressure compensation type (measuring cryogenic gas)
(3) temperature and pressure compensation type (measurement of steam)
a. saturated steam
b. superheated steam
multi-parameter differential pressure flow measurement system consists of
1.DMP9051 multi-parameter transmitter performance
● applies to all differential pressure flow sensor
● can be battery-powered live show no external power supply
● Fully isolated output super anti-jamming design, shielding all interference
● can output pulse current (4-20mA), 485 (modbu-rtu) signal (requires external power supply)
● built-in temperature and pressure sensors
● gas, steam pressure automatic temperature compensation
● turndown ratio 1:100 1:200 1:400
● Accuracy 0.1 0.2
● gas can display temperature, pressure, flow conditions, standard flow conditions and other parameters
● steam can display the temperature, pressure, density, mass flow and other parameters
2.DMP9051 and differential pressure flow sensor measuring system consisting of
(1) DMP9051-A general type (measuring liquid)
(2) DMP9051-B temperature and pressure compensation type (measuring cryogenic gas)
(3) DMP9051-C temperature and pressure compensation type (measurement of steam)
a. saturated steam
b. superheated steam
two, multi-parameter differential pressure flow system and the traditional differential pressure flow system compared to the advantages
● can be battery-powered live show no external power supply
This design is mainly for a lot of places do not provide power, but require metering of the scene, for example, this situation is more and more oil. If you can not solve the micro-power, differential pressure flowmeter is no way in this field application. Taking into account these complex environment of the scene, DMP9051 initial design based on micro-power, the flow rate, temperature, pressure acquisition calculations, using a built-in lithium battery, can work independently 2-3 years, domestic and foreign has not yet achieved This design performance transmitter, a leading position.
● Fully isolated output super anti-jamming design, shielding all interference
internal, external power supply is fully isolation design. Greatly improve the instrument's interference. The interference caused by the instrument, 90% of the power supply system through the instrument power supply cord into the meter, the meter cause interference, so the design is completely isolated, completely blocked the interference into the instrument approach greatly improves the instrument's interference.
● can output pulse current (4-20mA), 485 (modbu-rtu) signal (requires external power supply)
ordinary differential pressure transmitter can output current signal, DMP9051 can output pulse, current, 485 selectable signal. 485 signals simultaneously to the instantaneous flow conditions, mining cumulative flow, instantaneous flow rate at standard conditions, standard conditions cumulative flow, temperature, pressure and other signals transmitted to the host computer. Requires only one bus. The traditional differential pressure signal required, temperature transmitter signal pressure transmitter signal and many other lines.
pulse signal output to solve the traditional differential pressure flow converter online calibration problems, present the majority of systems are calibrated with the calibration pulse input as , while the current output has caused most of the flowmeter calibration can not be entered into the system for effective online calibration. Through online calibration, will greatly improve the accuracy of the instrument, rather than just relying on the traditional theoretical calculations.
● built-in temperature and pressure sensors gas, steam pressure automatic temperature compensation
DMP9051 multi-parameter transmitter, itself integrated micropower temperature and pressure sensors. On the temperature and pressure sensor signal acquisition. The gas temperature and pressure compensation can be automatically calculated gaseous equations, conversion to the standard side; steam or saturated steam according to superheated steam, automatic look-up table operation, converting mass flow. The traditional transmitter, does not have these features, to install temperature transmitter, pressure transmitter, differential pressure transmitter, secondary instrument or computer system can be achieved. At the same time requires a lot of wiring work, as well as setting work. The use of the instrument caused trouble, heavy workload, operational difficulties. Multi-parameter transmitter does not require wiring, and other settings. Very simple operation, improve the site's ease of use.
● high accuracy within 0.1 wide turndown ratio 1:100 1:200 1:400
traditional differential pressure transmitter range than is generally not more than 1:10, after prescribing the flow turndown ratio is only 1:3, which is caused by differential pressure flow sensor range is smaller than a bottleneck. Currently imported generally can reach 1:100, 1:10 differential pressure. DMP9051 transmitter, differential pressure range up to 1:400 scale, greatly broadens the range of differential pressure flow ratio, break this bottleneck, the turndown ratio prescribing can be achieved after 1:20. In terms of differential pressure can achieve the turndown ratio of 1:100. Such traditional scale adaptive, or adjust the range so do not. But ranges are being used. Before people solve this problem is by installing two range transmitters to achieve this effect. Namely a large flow transmitter, a small flow transmitter, but this increases the cost and difficulty of the operation using. And now do not need a transmitter can be fully realized.
● gas can display temperature, pressure, flow conditions, standard flow conditions and other parameters
the gas these compressible medium. DMP9051 will automatically collect temperature and pressure, and temperature compensated pressure gas equation operations. It flows into the standard square. The transmitter is to rely on the traditional installation differential pressure transmitter, temperature transmitters, pressure transmitters, secondary instrument or computer to achieve. The high cost of construction strength, difficult to operate.
● international standard open communication protocol modbus-rtu
DMP9051 485 adopt international standards and open communications protocol, modbus-rtu mode, and some PLC, PC configuration software with seamless communication. Simplifies the use of remote communication difficulty.
three, Summary
DMP9051 launch, greatly facilitates the promotion of differential pressure flowmeter, which greatly facilitates the users to use, effectively improve the measurement of differential pressure flow precision, differential pressure flow to bring a revolutionary progress.
www.sh-nuosha.com www.sh-nuosha.net ,多参数流量变送器; vwww.ky-china.net
上海诺莎机电设备有限公司
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一种革命性电池供电差压流量多参量变送器DMP9051温度压力传感器一体化自动温压补偿
差压流量计的发展现状
差压流量计占有流量仪表的市场的比例是非常之大的。市场中应用比较多的是孔板、喷嘴、文丘里、弯管、阿牛巴、威力巴、楔型、V锥等流量计。差压流量计有很多的优点，机构简单，长期稳定、抗干扰性好、抗震动能力强等。但是也有许多的缺点。主要就是使用起来比较麻烦，安装麻烦、一般都是按装差压变送器，然后配二次仪表或者计算机等。必然就造成了用户使用麻烦，容易出错，操作难度增加。成本也必然的增加。一般输出是电流，没办法做到每个表实流标定。国内没有一家做到每台差压流量仪表出厂前进行标定。都是靠计算来实现。必然造成理论和实际有一些出入，而带来误差。还有一个重要的缺点就是不能电池自供电，实现微功耗。因为好多地方是无法提供电源的。针对这些情况，我们研发了一个微功耗电池供电的差压流量多参量变送器。流量和差压传感器一体化设计，直接显示流量信号，可以不接电源的情况下进行流量的计量。全隔离的脉冲输出，可以直接在标定台子上实流标定，把系数反馈到多参量变送器。大大提高仪表的实际准确性。摆脱了差压流量计靠计算的这个操作办法。
一、 传统差压流量计计量系统的组成
1. 传统的差压变送器的性能
●适用与所有差压流量传感器
●可输出电流(4-20mA)
●量程比1:10,进口的1:100
●精度 0.1级 0.2级
●可现场显示单一流量
2.传统差压变送器和差压流量传感器组成的计量系统
(1)普通型的(测量液体)
（2）温度压力补偿型的(测量低温气体)
(3)温度压力补偿型（测量蒸汽）
a.饱和蒸汽
b.过热蒸汽
多参量差压流量计量系统的组成
1.DMP9051多参数变送器的性能
●适用与所有差压流量传感器
●可电池供电现场显示无须外接电源
●全隔离输出超强抗干扰性设计，屏蔽一切干扰
●可输出脉冲、电流(4-20mA)、485(modbu-rtu)信号（需外接电源）
●自带温度压力传感器
●气体、蒸汽自动温度压力补偿
●量程比1:100 1:200 1:400
●精度 0.1级 0.2级
●气体可显示温度、压力、工况流量、标况流量等参数
●蒸汽可显示温度、压力、密度、质量流量等参数
2.DMP9051和差压流量传感器组成的计量系统
(1)DMP9051-A普通型的（测量液体）
(2)DMP9051-B温度压力补偿型(测量低温气体)
(3)DMP9051-C温度压力补偿型（测量蒸汽）
a.饱和蒸汽
b.过热蒸汽
二、 多参量差压流量系统和传统差压流量系统相比较的优势
●可电池供电现场显示无须外接电源
这种设计主要是针对很多地方不能提供电源，而又需要有仪表计量的现场，譬如油田这种情况就比较多。如果不能解决微功耗，差压流量计就没有办法在这种现场应用。考虑到这些复杂的现场环境，DMP9051设计之初就立足微功耗，将流量、温度、压力的采集计算，使用一个内置锂电池，可以独立工作2-3年，国内、国外目前还没有能达到这样的设计性能的变送器,处于领先地位。
●全隔离输出超强抗干扰性设计，屏蔽一切干扰
内部、外部电源完全隔离设计。大大提高了仪表的抗干扰性。仪表带来的干扰，有90%是电源供电系统通过仪表供电电源线进入到仪表，对仪表造成干扰，这样完全隔离的设计，完全阻断了这种干扰进入仪表的途径，极大的提高了仪表的抗干扰性。
●可输出脉冲、电流(4-20mA)、485(modbu-rtu)信号（需外接电源）
普通的差压变送器只能输出电流信号，DMP9051可以输出脉冲、电流、485信号可选择。485信号能同时把工况瞬时流量、工矿累积流量、标况瞬时流量、标况累积流量、温度、压力等信号传输到上位机。只需要一条总线。传统的需要差压信号、温度变送器信号、压力变送器信号等多条线。
脉冲信号的输出，解决了传统差压流量转换器无法在线标定的问题，目前国内大部分标定系统都是以脉冲输入作为标定的，而电流输出就造成了流量计不能输入到大部分的标定系统，进行有效的在线标定。通过在线标定，会大大提高了仪表的精度，而不是传统的仅仅是靠理论计算。
●自带温度压力传感器气体、蒸汽自动温度压力补偿
DMP9051多参量变送器，自身集成了微功耗的温度和压力传感器。对温度压力传感器信号进行采集。对气体能够自动进行温度压力补偿气态方程的计算，换算到标方；蒸汽会根据饱和蒸汽或者过热蒸汽，自动查表运算，转换成质量流量。传统的变送器，不具备这些功能，要同时安装温度变送器，压力变送器，差压变送器，二次仪表或者计算机系统才能实现。同时需要进行大量的布线工作，还有设置工作。造成了仪表的使用麻烦、工作量大，操作困难等。多参量变送器不需要接线、设置等。非常简单的操作，提高了现场的易用性。
●高精度范围内0.1级超宽量程比1:100 1:200 1:400
传统的差压变送器的量程比一般不超过1:10,开方后流量的量程比就只有1:3,这也是造成差压流量传感器量程比小的一个瓶颈。目前进口的一般能达到1:100,微差压的1:10。DMP9051变送器，差压量程范围达到1:400,大大的拓宽了差压流量计的量程比，突破了这个瓶颈，使量程比开方后可以达到1:20。在微差压方面也可以达到1:100的量程比。这样传统量程自适应，或者调整量程等都不需要。而是正个量程都可以使用的。以前人们解决这个问题的方法是通过安装两个量程的变送器来达到这个效果。即大流量一个变送器，小流量一个变送器，但这样就增加了使用成本和操作难度。而现在不需要一个变送器就可以完全实现。
●气体可显示温度、压力、工况流量、标况流量等参数
对气体这些可压缩的介质。DMP9051会自动采集温度和压力，并进行温度压力补偿气态方程的运算。就流量转换成标准方。而传统的变送器是要靠安装差压变送器、温度变送器、压力变送器、二次仪表或者计算机来实现的。成本高，施工强度大，操作困难。
● 国际标准开放的通讯协议 modbus-rtu
DMP9051 485通讯采用国际标准开放的通讯协议，modbus-rtu模式，可以和一些PLC、装有组态软件的上位机无缝通讯。简化了远传通讯的使用难度。
三、 总结
DMP9051的推出，大大方便了差压式流量计的推广，极大的方便了用户的使用，有效的提高了差压流量计的计量精度,给差压流量计带来一种革命性的进步。
