MDM490差压变送器选型资料
压力开关及变送器选型资料-66页word资料
膜片式压力开关特点□适合各类工业现场能够理想的替代国外同类产品；□进口橡胶/316L不锈钢膜片/活塞式传感器，性能稳定可靠；□SPDT或DPDT输出；铸铝外壳，可选防爆；多种压力及电气接口可选；□结构简单，无可拆卸部件；□精度：0.5级；重复性：±1%；□量程：30Pa-40MPa可选；基本参数产品选型附加选项选型表KSP-K系列：丁腈橡胶膜片及O型圈，G1/4F压力接口（其他接口可订制），防爆产品型号后面加“-E”KSP-G系列：焊接316L不锈钢膜片及G1/4F压力接口（其他接口可订制），防爆产品型号后面加“-E”KSP-K系列：丁腈橡胶膜片及O型圈，1/2NPTF压力接口（其他接口可订制），防爆产品型号后面加“-E”KSP-G系列：焊接316L不锈钢膜片及1/2NPTF压力接口（其他接口可订制），防爆产品型号后面加“-E”KSP-K系列：丁腈橡胶膜片及O型圈，1/2NPTF压力接口（其他接口可订制），防爆产品型号后面加“-E”KSP-G系列：焊接316L不锈钢膜片及1/2NPTF压力接口（其他接口可订制），防爆产品型号后面加“-E”KSP-G系列：304不锈钢活塞及1/2NPTF压力接口（其他接口可订制），防爆产品型号后面加“-E”KSP-K系列：丁晴橡胶膜片及O型圈，1/2NPTF压力接口（其他接口可订制），防爆产品型号后面加“-E”膜片式隔膜压力开关选型表KSP-G系列：焊接316L不锈钢膜片及可定制压力接口，防爆产品型号后面加“-E”注：如需毛细管连接的产品，请注明毛细管的长度；传感器的材质可定制；膜片式压差开关可选隔膜膜片式差压开关选型表KSC-G系列：焊接316L不锈钢膜片及G1/4F压力接口（其他接口可定制），防爆产品型号后面加“-E”KSC-K系列：丁腈橡胶膜片及O型圈，G1/4F压力接口（其他接口可定制），防爆产品型号后面加“-E”KSC-G系列：焊接316L不锈钢膜片及G1/4F压力接口（其他接口可定制），防爆产品型号后面加“-E”膜片式负压开关选型表KSV-K系列：丁腈橡胶膜片及O型圈，G1/4F压力接口（其他接口可定制），防爆产品型号后面加“-E”KSV-G系列：丁腈橡胶膜片及O型圈，G1/4F压力接口（其他接口可定制），防爆产品型号后面加“-E”KSV-G系列：304不锈钢活塞及1/2NPTF压力接口（其他接口可定制），防爆产品型号后面加“-E”KSV-K系列：丁腈橡胶膜片及O型圈，G1/4F压力接口（其他接口可定制），防爆产品型号后面加“-E”KSP微压力控制器该系列产品采用橡胶/金属膜片式传感器元件，普通型可用于对感压元件含腐蚀作用的气体、液体或蒸汽等介质的场所实现压力的自动控制，控制器的设定值可调，最大量程为30Pa～25KPa，其调节范围为量程的15%～95%之间。
差压变器的选型原则
差压变器的选型原则
差压变送器的选型，一般根据量程（或测量范围）、工作压力、防爆等级、防腐与安装要求而定。
下面简要介绍
（一）按测量精度要求选型
（1）对于一般性介质，在测量精度要求不高的场合，且气源又方便，则可选用气动差压变送器
（2）对于测量精度要求较高，环境温度变化又大，宜选用矢量机构式电动III型差压变送器
（3）对于测量精度要求很高，控制装置采用可编程控制器或集散控制系统的，则可用测量精度高、故障低的电容式或电感式、扩散硅式、振弦
式差压变送器
（二）按测量范围与工作压力选型
差压变送器的型号规格应根据工艺上要求测量的量程及工艺设备或管道内工作压力来确定。
（1）变送器实际测量的量程应大于等于仪表本身所能测量的最小量程，而小于或等于仪表本身所能测量的最高量程上限值。
（2）变送器应用场合的实际工作压力（即静态工作压力）应小于或等于变送器所能承爱的额定工作压力。
（三）按被测介质性质选型
（1）被测介质粘度大，易结晶、沉淀或聚合引起堵塞的场合，宜采用单平法式差压变送器
（2）被测介质有大量常常或结晶析出，致使容器壁上有较厚的结晶或沉淀时，宜采用单插入式法兰差压变送器，若上部容器壁和下面的一样，
也有较厚的结晶层时，常用双插入式法兰差压变送器。
（3）被测介质腐蚀性较强而负压室又无法选用合适的隔离液时，可选用双平法兰式差压变送器。
关于微差压变送器的选用
微压微差压变送器的选型变送器2010-01-05 16:07:53 阅读61 评论1 字号：大中小订阅The Selection of Micro-Pressure and Micro-Differential Pressure Transmitters方原柏摘要：从分析几张表格入手，介绍微压微差压变送器选型要注意的几个问题：各种微压微差压变送器的实际使用精度相差悬殊，应通过对比确定最佳选型；微压力测量尽量不要选差压变送器；极低微压量程可以选较大量程来替代。
关键词：变送器精度微压微差压中图分类号：文献标识码：文章编号：1 概述微压微差压变送器检测的是微压力、微差压，通常认为几个kPa 以下的压力、差压为微压、微差压，本文所论述的大致是1个kPa 以下的压力、差压。
由于传感器技术、微处理器技术的发展，变送器的精度已从六十年代的1%提高到七十年代的0.5%、0.25%、九十年代初期的0.1%及九十年代中后期的0.075%、0.05%。
但对绝大多数变送器来说，上面提到的精度是通用量程的精度，比如中压、高压、中差压、高差压量程的精度，而微压微差压量程则往往例外，精度要比通用量程低一个档次。
再从变送器的实际使用精度来看，由于高量程比变送器只是在一定量程比范围内保证其精度，对中压、高压、中差压、高差压量程来说，保证精度的量程比范围较大，而对微压微差压来说，通常保证精度的量程比范围较小。
微压微差压变送器的实际使用精度往往不是我们想象的那样高，而且不同产品的指标差别也非常大。
很多用户在实际使用过程中也亲身体会到微压微差压变送器的稳定性、精度相对来说是要差一点。
基于以上原因，微压微差压变送器的选型在变送器的选型中应该是一个特殊的问题。
作者对这个问题作了一些研究，从厂家提供的选型样本中挑出了一些数据列出了几张表，然后逐一分析这些表格，从而较深入的阐述微压微差压变送器选型时要注意的一些问题。
同时通过这些表格的分析结果，使我们建立一个概念：对微压微差压变送器的选型问题要认真对待，一定不能马虎。
差压变送器选型手册
差压变送器选型手册差压变送器是一种常见的工业仪表，在工业自动化过程中广泛应用。
它主要用于测量两个位置之间的压力差，并将其转换为标准信号输出，以便于监测和控制系统的使用。
差压变送器的选型是确保工业过程正常运行的关键步骤。
不同的应用场景需要不同类型的差压变送器，因此选择合适的型号和规格对于确保测量精度和可靠性来说至关重要。
首先，在选型过程中需要考虑的是测量范围。
不同的工业应用需要不同的测量范围，因此需要确保所选的差压变送器能够满足工艺过程中的压力差范围。
一般来说，测量范围应该略大于实际测量范围，以确保所选的差压变送器在压力差较大时也能正常工作。
其次，需要考虑的是输出信号类型。
差压变送器的输出信号类型通常有模拟信号和数字信号两种。
模拟信号通常是4-20mA或0-10V，而数字信号则可以是RS485、HART等。
根据实际需求，选择适合的输出信号类型以便于与监测和控制系统进行数据交互和集成。
此外，差压变送器的精度和稳定性也是选型过程中需要考虑的因素。
精度通常以百分比或毫米水柱来表示，而稳定性则表示了差压变送器在长时间使用过程中的性能表现。
为了确保测量结果的准确性和一致性，需要选择具有较高精度和稳定性的差压变送器。
最后，还需要考虑差压变送器的安装方式和材质选择。
安装方式通常有法兰连接、螺纹连接等，而材质选择则需要根据工艺过程中的介质和环境条件进行选择。
确保差压变送器与工艺过程兼容，并能够正常运行和抵抗腐蚀。
综上所述，差压变送器的选型是一个综合考虑多个因素的过程。
合理选择型号和规格的差压变送器可以确保工业过程的稳定运行，提高生产效率和质量。
因此，在选型过程中应该根据实际需求和条件进行综合评估，并选择最适合的差压变送器。
差压变送器的选型参考点 变送器如何操作
差压变送器的选型参考点变送器如何操作在工业生产过程中，差压变送器常常用来与节流装置搭配测量液体、蒸汽和气体流量，或用来测量液位、液体分界面及差压等参数。
差压变送器是丈量变送器两端在工业生产过程中，差压变送器常常用来与节流装置搭配测量液体、蒸汽和气体流量，或用来测量液位、液体分界面及差压等参数。
差压变送器是丈量变送器两端压力之差的变送器,输出规范信号（如 4～20mA,1～5V）。
差压变送器与一般的压力变送器不同的是，它们均有2个压力接口, 差压变送器一般分为正压端和负压端,一般情形下, 差压变送器正压端的压力应大于负压段压力才可以测量。
由于流量计的精度有限，最高也只要0.2级。
差压变送器的选型参考点：1、确认压气力程一般情况下，按实际测量压力为测量范围的80%选取。
2、确认工作温度范围测量介质温度应处于变送器工作温度范围内，如超温使用，将会产生较大的测量误差并影响使用寿命；在差压变送器的生产过程中，会对温度影响进行测量和补偿，以确保产品受温度影响产生的测量误差处于精准度等级要求的范围内。
在温度较高的场合，可以考虑选择高温型差压变送器或实行安装冷凝管、散热器等辅佑襄助降温措施。
3、确认压力接口形式公司产品以螺纹连接（M20×1.5）为标准接口形式，若客户需要其他特别接口形式，可依据客户要求进行设计生产。
4、确认测量压力介绍按测量介质的不同，可分为干燥气体、气体液体、强腐蚀性液体、粘稠液体、高温气体、液体等，依据不同的介质正确选型，有利于使用和延长产品的寿命。
5、确认差压变送器测量压力的类型压力类型紧要有表压、绝压、差压等。
表压是指以大气为基准，小于或大于大气压的压力；绝压是指以确定压力零位为基准，高于确定压力；差压是指两个压力之间的差值。
6、确认等级精度差压变送器的测量误差按精准度等级进行划分，不同的精准度对应不同的基本误差限（以满量程输出的百分数表示）。
实际应用中，依据测量误差的掌控要求并本着使用经济的原则进行选择。
差压(风压)变送器
差压(风压)变送器
■概述：
差压(风压)变送器选用进口压力芯片，敏感元件采用扩
散或离子注入等工艺形成电阻并连接成惠斯通电桥，用
微机械加工技术在电桥下形成压力敏感膜片。
当压力作
用在膜片上时，电阻值发生变化并且产生一个与作用压
力成正比的线性化输出信号。
我们在惠斯通电桥上加上
直流电源，就会产生一个直流电压信号的输出.经过二次
转换线路，实现两线制4~20MA输出,灵敏度高、精度高、
抗过载能力强,抗干扰能力强，耐酸碱，长期稳定可靠。
■技术参数：
测量范围：负压表压绝压
供电：24VDC
过载能力：量程的2倍
输出信号：(4～20)mA（二/三/四线制）、（0～10）mA、（0～5）V、（1～5）V工作温度：-30～70℃
温度补偿范围：-20～70℃
环境湿度：0～95%
外壳材质：压铸合金铝
过程连接材质：1Cr18Ni9Ti
电气接口：Ф8宝塔嘴
防护等级：IP65
■电气连接图：
■产品选型：
SLF◇S◇◇差压(风压)变送器---------------------淮安森菱仪表有限公司SLF差压(风压)变送器-------------------------------0517-********◇精度要求
1、、0.25%
2、0.5%
S◇输出信号（其他要求请说明）
1、4~20mA
2、0~5V
3、0~10mA
◇连接方式（其他要求请说明）
A、宝塔嘴接口型（默认）。
差压变送器规格书
PIPE MAT'L MPa(G)
℃
MEAS. RANGE kPa
远传密封装置
附件 Accessories
其他 Miscell
说明 NOTES：
编制
校对
审核
日期
等级 Rating
26 法兰材质 Flange Mat'l
密封面 Facing
27 输出信号指示表 Out. Sign. Indic.
28 安装支架 Mounting
29 终端接头 End Conn.
连接规格 Size
30 配对法兰 Mating Flanges
31 过滤器减压阀 Filter. Regulator W/Gauge
9 电气连接 Elec.Conn.
气动连接 Pneu. Conn.
10 防护等级 Enclosure Protection
11 防爆等级 Explosion Proof
12 可用范围 Available Range kPa
13 测量元件材质 Meas Element Mat'l
14 过程法兰及法兰接头材质 Process Flange & connector Mat'l
21 毛细管和保护层材质 Capil. & Prot. Armor Mat'l
22 毛细管长度 Capil. Length 填充液 Fill Liq.
23 插入部分直径 Exte. Diam. 长度 Length
24 过程连接型式 Process Conn. 连接规格 Size
25 法兰标准 Flange STD.
变送器 Transmitter Unit
测量部分和本体
差压变送器规格书
版本
REV
Remote Seal Unit Sensing & Body
2 型号 Model
3 输出信号 Output Sign.
4 精度 Accuracy
5 零点迁移 Zero Elevator
6 壳体材质 Housing Mat'l
7 电源 Power Supply
8 气源 Power Supply 9 电气连接 Elec.Conn.
33 三阀组 Three-Valve Manifold
35 制造商 Manufacturer
36
37 序号 位号 ITEM TAG No. No.
检测位置 SEVICE
介质 FLUID
工艺管道
材质 PIPE MAT'L
操作压力 OPER.
PRESS MPa(G)
操作温度 OPER.TEM
P ℃
测量范围 MEAS. RANGE
变送器 Transmitter Unit
测量部分和本体
仪表规格书（差压变送器） INSTRUMENT SPECIFICATION
( DIFF. PRESS. TRANS.)
1 仪表名称 Instrument Name 类型 Type
档案号PROJECT No: 设计阶段 STAGE: 页数PAGE:
16 垫片/O型环材质 Gasket/O-Ring Mat'l
17 螺栓材质 Bolts Mat'l
18 过程连接 Process Conn.
19 20 21
远传密封膜片类型 Seal Type 本体材质 Body Mat'l 毛细管和保护层材质 Capil. &
膜片材质 Diaph. Mat'l
490W无线热水蒸汽差压计手册说明书
The Series 490W Wireless Hydronic Differential Pressure Manometer is the most accurate and easy to operate manometer on the market. By using wireless transducers and a mobile device, a single operator can monitor and balance a hydronic system in less time than traditional hydronic balancers. The Series 490W transducers connect wirelessly to a UHH6 or newer handheld device, or your own mobile device, to monitor differential pressure and flow on up to three different valves. Being wireless, there are no hoses to carry, snag on equipment or needing to be drained. The 490W utilizes Dwyer’s hydronic application software that contains valve charts for numerous manufacturers, which converts differential pressure to flow directly on the screen.Included with the 490W HKIT 1. P ressure transducers (2 per kit) with case 2. Installation and operating manual (IOM)3. 1/4˝ SAE 45° x 1/4˝ female NPTF straight adapter (2 per kit)4. 1/4˝ female NPT x 1/4˝ male NPT elbow fitting (2 per kit)5. P iercing gauge adapters [2 per size] (6 per kit) -1/8˝ DIA x 1-1/2˝ length; 1/8˝ DIA x3˝ length; 1/16˝ x 1-1/2˝ length6. 1/4˝ female NPT x 1/4˝ quick connect coupler (2 per kit)7. 4 pack AAA batteries8. 490W hard carrying caseBATTERY INSTALLATIONThe kit is shipped with 4 AAA batteries (2 for each sensor), which must be installed before operation. Loosen the two screws on either side of the clear cap (they will stay attached to the cap), and remove the cap from the transducer. Install the batteries according to the housing markings and replace the top cap. Do not over tighten the screws.With the sensors set to sleep mode via the app (see DISCONNECTING FROM SENSORS), the sensors can be stored in the case with the batteries still installed. If the kit is going to be stored for a long time, however, it is recommended that the batteries be removed to reduce the risk of leakage.When battery replacement becomes necessary, use only a AAA alkaline (LR03) type such as Energizer ® E92. These are recommended due to a decreased risk of battery leakage, and the specified battery life is based on usage of them.Use of an incorrect battery type could result in product damage or battery leakage. Zinc-carbon types, often labeled heavy-duty, are not recommended because of the increased potential for leakage.LED INDICATIONWith functional batteries installed, the LED behavior will indicate sensor status. The red LED indicates the High unit and the blue LED indicates the low unit. Refer to the table below for different sensor states.Optional handheld device UHH7 shownDo not leave the needle in the pressure plug any longer than necessary. The longer the probe is inserted, the longer it will takefor the plug to seal after the probe is removed.Do not exceed the burst pressure of the units (500 psi).OPERATIONFor more details, see app tutorial 1. FLOW (Standard Valve)A. After the sensors are connected click <Calculate Flow>B. F rom the drop down menu, enter all of the proper information including themake, model, and pipe size of the setup2. FLOW (Custom Valve)A. Select Manual from the drop down menu i. Enter CV (Valve Flow Coefficient) ii. E nter the Specific Gravity of the fluid. The default is set to 1.0 for water.B. I f you would like a custom valve added to the app, please contact your salesrepresentative.3. Log DataA. From the sensor screen click <LOG THIS READING> to log the current readingB. Click bottom <LOG TAB> to view logsC. P ress the floating export button and send the logs (.csv file) to a selectedapplication.D. To clear individual log press <X> or <CLEAR ALL>DISCONNECTING FROM SENSORS (SLEEP)While connected to the sensors, push the <back> button on the phone. The app will prompt you to put the sensors to sleep or not.It is recommended that the sensor be put to sleep to maximize battery life.Printed in U.S.A. 6/23FR# 443142-53©Copyright 2023 Dwyer Instruments, LLC FCC RF EXPOSURE INFORMATION AND STATEMENTThe SAR limit of USA (FCC) is 1.6 W/kg averaged over one gram of tissue. Device types: S09 (FCC ID: ZHN-W63) has also been tested against this SAR limit. The highest SAR value reported under this standard during product certification for use at the ear is 0.430 W/kg and when properly worn on the body is 0.772 W/kg. This device was tested for typical body-worn operations with the back of the handset kept 1.5 cm from the body. To maintain compliance with FCC RF exposure requirements, use accessories that maintain a 1.5 cm separation distance between the user’s body and the back of the handset. The use of belt clips, holsters, and similar accessories should not contain metallic components in its assembly. The use of accessories that do not satisfy these requirements may not comply with FCC RF exposure requirements and should be avoided.This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2)This device must accept any interface received, including interference that may cause undesired operation.Note: The manufacturer is not responsible for any radio or TV interference caused by unauthorized modification to this equipment. Such modifications could void the user’s authority to operate the equipment. This equipment has been tested and found to comply with the limits for a class B digital device, pursuant to Part 15 of the FCC rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try and correct the interference by one of more of the following measures:• Reorient or relocate the receiving antenna• Increase the separation between the equipment and receiver • C onnect the equipment into an outlet on a circuit different from that to which thereceiver is connected• Consult the dealer or an experienced radio/TV technician for helpMAINTENANCE/REPAIRUpon final installation of the Series 490W, no routine maintenance is required. The Series 490W is not field serviceable and is not possible to repair the unit. Field repair should not be attempted and may void warranty.WARRANTY/RETURNRefer to “Terms and Conditions of Sale” in our catalog and on our website. Contact customer service to receive a Return Materials Authorization (RMA) number before shipping the product back for repair. Be sure to include a brief description of the problem plus any additional application notes.Do not dispose of as unsorted domestic or municipal waste. Consult retailer or local authorities for recycling information.CONNECTING TO SENSORS 1. P ower on device by installing batteries and re-assembling the cap (if not alreadyinstalled). Sensors in sleep mode will wake upon connecting in the app 2. V erify that the universal handheld, UHH6 or newer, or compatible smart device hasBluetooth ® technology turned on and is within range3. UPDATE the Dwyer Hydronic App from the Google Play ™ Store4. Open the Dwyer Hydronic App - see tutorial within app for more details5. Click <Sensor Setup>6. Select which sensors to use7. After the sensors are verified, pair the sensorsA. If there are two New Style sensors, they will pair automaticallyB. I f there are Legacy sensors, you must pair them manually and select which ishigh/low8. Click <Continue>9. Wait for all sensors to connect (pressure reading will turn white)10. I f one or both sensors don’t connect, click on the sensor not connected and select<Connect>PRESSURE CONNECTIONZero the sensors before making the pressure connection.The 490W kit is shipped with 3 different sized piercing gauge adapters (needles) to be used with pressure test plugs. When using these pressure test plug adapters:1. R emove the cap from the pressure test plug. The operator should always carryspare caps in case they get lost or damaged.2. U sing a small amount of petroleum jelly or silicone grease, lubricate the needles ofthe gauge adapter. Ensure that the seal on the pressure test plug is clear.3. T he operator must wear protective goggles to avoid debris or liquids being blowninto the eyes during removal of the needles. Some leakage after removal of the gauge adapter is normal.4. After the needle is removed, immediately replace the cap on the test plug.Android ® is a registered trademark of Google, Inc.Bluetooth ® is a registered trademark of Bluetooth SIG, Inc.Energizer ® is a registered trademark of Energizer Brand, LLCGoogle Play ™ is a trademark of Google LLCTROUBLESHOOTING ConnectivityFor more information on the operation of the software- please launch the “help” tutorial from the app.If only one sensor shows up to connect on the app. Restart the app.If there are issues with the valve list, clear the app’s cache and force stop the app. Relaunch the app and try again.App will allow you to pair any set of same range sensors together. Ensure to pair a calibrated set. New Style sensors will automatically pair together. If the paired set is not a calibrated set, the accuracy is not guaranteed.You can connect up to 3 pairs of sensors on the app at one time.Case should be vertical when stored so sensors can drip out water.。
差压液位变送器规格书(一)
差压液位变送器规格书(一)差压液位变送器规格书是一份详细的技术资料，通常由生产厂家或供应商提供。
这个规格书包含了所有技术规范、参数和功能以及建议使用环境等详细信息。
下面将从如下几个方面详细介绍差压液位变送器规格书：一、技术规范技术规范是差压液位变送器规格单中最重要的一项内容。
这个部分包括变送器的类型、结构、使用条件等。
它们是确保变送器能够有效运行的重要基础。
在规格书中，也会列出变送器的精度和测量范围，以及可选的信号输出类型等相关信息。
二、参数和功能规格书的另一个重要部分是关于参数和功能的描述。
在这个部分中，会详细介绍差压液位变送器的工作原理和工作流程。
同时，还会介绍变送器的特殊功能，如报警系统和校准功能等。
此外，规格书中还会列出变送器可测量的介质种类和测量温度的范围等详细参数。
三、建议使用环境在规格书的第三部分中，会详细介绍变送器建议使用的环境。
这个部分会列出变送器的适用范围，包括使用温度、压力和介质等。
此外，规格书还会介绍环境因素对变送器的影响，如温度变化、震动、电磁场和腐蚀等，这些信息可以帮助用户确定是否适合在其特定环境下使用变送器。
四、维护和保养在规格书的最后一部分，会详细介绍变送器的日常维护和保养。
这个部分包括卡尺的校准和维护，以及如何清洗和保养变送器的部件。
此外，规格书还会列出维修和更换部件所需的时间和成本。
总之，差压液位变送器规格书是一份非常重要的技术文档，为用户提供了许多有用的技术规范和操作建议。
通过认真阅读规格书，用户可以更好地了解变送器的性能，以及如何更好地使用和维护它们，这有利于保证变送器正常运行，同时也有助于提高工作效率和安全。
关于压力变送器的选型 压力变送器如何操作
1、测量压力的类型:压力类型首要有表压、绝压、差压等；表压是指以大气压力为基准，小于或大于大气压力的压力；绝压是指以确定压力零位为基准，高于确定压力零位的压力；差压是指两个压力之间的差值。
通过不同介质的压力，压力变送器可以通过放大器放大型号把压力转换成4—20MA电流信号传输给数显报警、记录仪等二次仪表配用。
差压变送器适用于高温下粘稠介质、易结晶的介质、带有固体颗粒或悬浮物的沉淀性介质、强腐蚀或剧毒性介质。
可除去导压管泄漏污染四周环境现象的发生，可免去接受隔离液时，因测量信号的不稳定需要常常补充隔离液的繁琐工。
5、工作温度规模:测量介质的温度应维持在压力变送器能够正常工作的温度范围以内，假如温度超出适用范围，误差会变得很大并且仪器的使用寿命也会相应缩短；在压力变送器的生产过程中，会对温度影响进行测量和抵偿，以保证商品受温度影响发生的测量差错处于精度度要求的范围内。在温度较高的场合，可以思考选择高温型压力变送器或接受装置冷凝管（器）、散热器等辅佐降温方法。
电容式压力变送器的安装准备工作介绍
电容式压力变送器产品设备在很多地方都有较为广泛的应用，因此在安装之前要做好很多准备工作；
从现有的情况下来看这种产品，由于本身种类相对较多，安装前的准备工作我们确定要特别自信；
假如这些产品设备不注意的话，很有可能给后续使用带来一系列的麻烦；
那么在电容式压力变送器这种机械设备进行实际安装的过程当中，都要做好哪些准备工作？
如电源正常再察看传感器零位是否有输出，或者进行简单加压看输出是否变化，有变化证明传感器没有损坏，假如无变化传感器即已经损坏。
差压变送器的选择与应用
例题温度为50℃时，对应的输出应为： 50(20 4) 4 8(mA) 200 0
其余类推。
7
2、动动脑筋——实例分析
（2）算出各测试点正、反行程时的绝对误差 正
与 变 ，并算出正、反行程之差 反 ，
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2、动动脑筋——实例分析
变送器量程
测量范围、精度
测量环境
3、具体选型
测量功能
使用功能
测量功能 安装条件
测
量
介
操作条件
质
安装功能
操作功能
使用功能
环
保
及
卫 生
使用功能
互换性
实际工艺情况
管理功能
综合功能
13
三、某产品选型表
14
15
三、产品知识——福建虹润 产品选型表
16
四、动笔做做—— 产品购买单填写
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五、小结。
1、小结 ——通过本次课学习，在能力应达到：
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1、构成原理
Y
K 1 KF
(Dx
z0 )
KF 1
1 Y F (Dx z0 )
y ymax
y min 0 x min
xmax x
变送器输出输入关系
变送器的输出与输入之间的关系仅取决于测量 部分和反馈部分的特性，而与放大器的特性几乎无关。
我国常用仪表的精度等级有0.005，0.02， 0.05，0.1，0.2，0.4，0.5，1.0，1.5，2.5，4.0
2
1、仪表的品质指标
（2）仪表的变差（回差）
变差
最大绝对差值 标尺上限值 标尺下限值
差压变送器技术参数共21页文档
压力和差压变送器（一）差压变送器原理与使用本节根据实际使用中的差压变送器主要介绍电容式差压变送器。
1. 差压变送器原理压力和差压变送器作为过程控制系统的检测变换部分，将液体、气体或蒸汽的差压(压力)、流量、液位等工艺参数转换成统一的标准信号(如DC4mA～20mA 电流)，作为显示仪表、运算器和调节器的输入信号，以实现生产过程的连续检测和自动控制。
差动电容式压力变送器由测量部分和转换放大电路组成，如图1.1所示。
图1.1 测量转换电路图1.2 差动电容结构差动电容式压力变送器的测量部分常采用差动电容结构，如图1.2所示。
中心可动极板与两侧固定极板构成两个平面型电容H C和L C。
可动极板与两侧固定极板形成两个感压腔室，介质压力是通过两个腔室中的填充液作用到中心可动极板。
一般采用硅油等理想液体作为填充液，被测介质大多为气体或液体。
隔离膜片的作用既传递压力，又避免电容极板受损。
当正负压力(差压)由正负压导压口加到膜盒两边的隔离膜片上时，通过腔室内硅油液体传递到中心测量膜片上，中心感压膜片产生位移，使可动极板和左右两个极板之间的间距不相对，形成差动电容，若不考虑边缘电场影响，该差动电容可看作平板电容。
差动电容的相对变化值与被测压力成正比，与填充液的介电常数无关，从原理上消除了介电常数的变化给测量带来的误差。
2. 变送器的使用（1）表压压力变送器的方向低压侧压力口（大气压参考端）位于表压压力变送器的脖颈处，在电子外壳的后面。
此压力口的通道位于外壳和压力传感器之间，在变送器上360°环绕。
保持通道的畅通，包括但不限于由于安装变送器时产生的喷漆，灰尘和润滑脂，以至于保证过程通畅。
图1.3为低压侧压力口。
图1.3 低压侧压力口（2）电气接线①拆下标记“FIELD TERMINALS”电子外壳。
②将正极导线接到“PWR/COMN”接线端子上，负极导线接到“-”接线端子上。
注意不得将带电信号线与测试端子（test）相连，因通电将损坏测试线路中的测试二极管。
Series 490W 无线热水系统差压测量仪说明说明书
Series 490W Wireless Hydronic Differential Pressure Manometer is the most accurate and easy to operate manometer on the market. By using wireless transducers and a versatile handheld, a single operator can monitor and balance a hydronic system in less time than traditional hydronic balancers. The Series 490W utilizes mobile technology to communicate via a Bluetooth connection with the transducers to monitor differential pressure and flow on up to three different valves. Being wireless means there are no hoses to carry, snag on equipment or needing to be drained. The 490W includes the Dwyer Hydronic Application Software that contains valve charts for numerous manufacturers, which converts differential pressure to flow directly on the screen.• Rugged weatherproof handheld housing withstands 1.5 meter drop test • Wireless measurement of differential pressure, single pressure and air flow• Ergonomic design is much lighter and easier to work with, providing greater maneuverability and quick install setup• Refrigerant pressure testing • Hydronic valve balancing• Measure pressure drop across pumps• Measure pressure drop across chiller and coils for freeze protectionFEATURES/BENEFITSSPECIFICATIONSWireless DistanceUp to 65´ (19.8 m).ServiceCompatible gases and liquids.Wetted Materials316 SS, PTFE, brass.Accuracy2% of reading, ±1 pensated Temperature Range14 to 140°F (-10 to 60°C).Pressure Hysteresis±0.25% FS.Pressure Limits0-50 psi and 0-200 psi (see chart for more ranges).Process Temperature Limits-4 to 185°F (-20 to 85°C).Display 5˝ Gorrilla ® glass 3, touch screen, 1280x720.Resolution0.01 psi.Process Connections Two 1/4˝ male NPT.Power RequirementsCR2050 lithium battery, user replaceable.Weight2 lb (907 g).Agency ApprovalsCE, FCC.DESCRIPTIONAPPLICATIONSSERIES 490W | WIRELESS HYDRONIC DIFFERENTIAL PRESSURE MANOMETER®DIMENSIONSSERIES490W: Wireless hydronic differential pressure manometer RANGE-6: 0 to 50 and 0 to 200 psi OPTION-NIST: NIST calibration certificateKIT-HKIT: Hydronic balancing kit490W-6-HKIT-NISTHOW TO ORDERUse the bold characters from the chart below to construct a product code.ACCESSORIESModel DescriptionA-490W-1A-490W-2A-490W-3A-490W-4A-490W-5A-490W-6A-HKIT-500A-HKIT-500XL A-HKIT-5100 to 15 psid replacement sensors [2 paired sensors]0 to 30 psid replacement sensors [2 paired sensors]0 to 50 psid replacement sensors [2 paired sensors]0 to 100 psid replacement sensors [2 paired sensors]0 to 500 psid replacement sensors [2 paired sensors]0 to 200 psid replacement sensors [2 paired sensors]Piercing gage adapter, 1/8˝ dia x 1-1/2˝ length (2 per kit)Piercing gage adapter, 1/8˝ dia x 3˝ length (2 per kit)Piercing gage adapter, 1/16˝ dia x 1-1/2˝ length (2 per kit)3-17/64 [83]6-17/64[159]5/8[16]1.0002.940.944HEX©Copyright 2020 Dwyer Instruments, Inc.Printed in U.S.A. 12/20DS-490W Rev. 3ORDER ONLINE TOD DWYER INSTRUMENTS, INC.Important Notice: Dwyer Instruments, Inc. reserves the right to make changes to or discontinue any product or service identified in this publication without notice. Dwyer advises its customers to obtain the latest version of the relevant information to verify, before placing any orders, that the information being relied upon is current.Gorilla ® is a registered trademark of Corning, Incorporated。
压阻式差压变送器SNMDM490的详细说明书
压阻式差压变送器SNMDM490
SNMDM490型号是长沙盛恩自动化设备有限公司的特有型号，购买时请认准长沙盛恩自动化设备有限公司官方网址：
SNMDM490型差压变送器的敏感元件是一个固态压阻敏感芯片，在芯片和两个波纹膜片之间充有硅油，被测差压作用到两端波纹膜片上，通过硅油把差压传递到敏感芯片上。
敏感芯片通过导线与专用放大电路相连接，它利用半导体硅材料的压阻效应，实现差压与电信号的转换。
由于敏感芯片上的惠斯登电桥输出的信号与差压有着良好的线性关系，所以可以实现对被测差压的准确测量。
特点
◎全不锈钢结构设计，体积小巧重量轻，安装方便
◎激光焊接，全密封结构，外壳防护等级IP65
◎传感器为扩散硅压阻式差压传感器，316L不锈钢隔离膜片，体积小，经过了温度补偿和老化筛选，性能稳定可靠
◎产品可在外部调节零点和满度
◎防爆型MDM490产品符合GB3836.4标准的iaIICT6要求，取得了防爆合格证
用于各种气体、液体的压差测量，适用于石油、化工、水文等的管道路提差压、水位差的测量.
接插件连接型外形结构和尺寸
电缆连接型外形结构和尺寸
接插件外形及排列
接插件连接定义电缆线连接定义
以上资料由长沙盛恩自动化设备有限公司提供：。
MDM460型多功能智能差压变送控制器说明书
MDM460型多功能智能差压变送控制器产品概述MPM/MDM460/MPM460W型多功能智能压力/差压/液位变送控制器可适用于露天及现场环境比较恶劣的场合，对现场压力、差压、液位进行精确测量和控制，是一种能够以RS485总线形式组网，同时需要实时显示现场测量值，并向其他设备提供标准模拟信号或提供接点控制信号的智能化多功能产品。
该产品可广泛应用于化工、冶金、给排水、电厂、海洋、环境保护、航空、计量、科研等领域，实现压力、差压、液位信号的测量、传输、显示和控制。
产品特点•RS485半双工通讯接口，能够进行数据信号传输和远程调校，方便组网，易与无线MODEM接口，实现数据无线远传；•感压部分分别采用扩散硅压阻式压力、差压敏感元件，采用非线性数字修正技术进行补偿，产品精度高；•变送控制器经过严格测试和筛选，性能可靠，电子壳体采用铸铝件，整机防护等级达到IP65；•现场可通过按键手动调校和进行参数设置，操作方便；•LED测量值显示和状态信息显示；•可提供最多五路压力控制接点；•产品系列形式多样，有多种压力接口和标准输出信号供选择，灵活方便。
性能参数测量范围：-0.1…0～0.01…100MPaMPM460过载压力：1.5倍满量程压力或110MPa(取最小值)测量范围：表压0～1…200mH2OMPM460W过载压力：1.5倍满量程压力传感器部分外壳防护等级为IP68测量范围：差压0～35kPa…3.5MPaMDM460静压：≤20MPa输出信号：模拟量4～20mADC，0～10/20mADC或0/1～5VDC；数字量RS485精度：±0.25%FS(典型)；±0.5%FS(最大)零点温度漂移：±0.03%FS/℃(≤100kPa)±0.02%FS/℃(＞100kPa)满度温度漂移：±0.03%FS/℃(≤100kPa)±0.02%FS/℃(＞100kPa)长期稳定性：≤±0.5%FS/年继电器接点控制数目：1点～5点负载能力：240V/3A(AC)或30V/5A(DC)触点寿命：＞100000次显示部分：4位0.56英寸LED数据显示，显示范围：-1999～99994位0.36英寸LED状态信息显示供电电源：220VAC±15%或220VDC或24VDC最大功耗：≤3.5W环境温度：-10℃～60℃振动频率：(0～300)Hz介质温度：-10℃～80℃加速度：≤3×9.81ms-2存贮温度：-40℃～125℃冲击：≤10×9.81ms-2压力接口：不锈钢1Cr18Ni9Ti隔离膜片：不锈钢316L电子壳体：铝合金密封方式：氟橡胶或全焊接接口形式：标准型MPM460接口为M20×1.5外螺纹，标准型MDM460接口为G1/4内螺纹标准型MPM460W，其传感器部分与MPM316W型投入式液位传感器相同外形结构(单位：mm)MDM460电气连接应用示例(单位：mm)选型指南选型提示1、请在订单上注明供电电源、精度等级和控制接点数，未注明的按24VDC供电，0.5级精度、无控制接点供货。
Series 490W 水汽差压仪器软件规格说明书和操作说明
Series 490W Hydronic Differential Pressure Manometer is the most accurate and easy to operate manometer on the market. By using wireless transducers and a versatile handheld, a single operator can monitor and balance a hydronic system in less time than traditional hydronic balancers. The Series 490W utilizes mobile technology to communicate via a Bluetooth connection with the transducers to monitor differential pressure and flow on up to three different valves. Being wireless means there are no hoses to carry, snag on equipment or needing to be drained. The 490W includes Dwyer’s Hydronic Application Software that contains valve charts for numerous manufacturers, which converts differential pressure to flow directly on the screen.INCLUDED WITH THE 490W1. Handheld test instrument with Dwyer Hydronic App preloaded onto device2. Pressure transducers (4 per kit) with case3. Installation and operating manual4. 1/4˝ SAE 45° x 1/4˝ Male NPT straight adapter (2 per kit)5. 1/4” Female elbow x 1/4˝ Male NPT fitting (2 per kit)6. Piercing gauge adapters [2 per size] (6 per kit) -1/8˝ DIA x 1-1/2˝ length -1/8˝ DIA x 3˝ length -1/16˝ x 1-1/2˝ length7. 490W fabric carrying case8. Piercing gauge adapters and fittings case (2 per kit)9. Charger cable and power adapter for handheld test instrument Gorilla ® is a registered trademark of Corning, IncorporatedOPERATIONPowering On/OffTo turn on the handheld, press and hold the power button. Wait approximately 15 seconds for it to fully power on. Swipe to unlock the unit.To turn off the unit, either press and hold the power/sleep button and press Power Off when prompted on the LCD or press the reset button.Handheld BatteryThe universal handheld utilizes an internal rechargeable battery. The battery symbol in the top right of the screen shows the status of the battery.TRANSDUCER BATTERY INSTALLATIONThe unit is shipped with a CR2050 lithium battery installed. To replace battery, unscrew black top cap from transducer. Tilt transducer to remove old battery. Install new battery and replace top cap.Low Battery IndicatorA weak battery can cause improper operation or inaccurate measurements. The unit is supplied with a battery that can last up to 2 years, depending on usage. When transducers are sent in for annual recertification, the battery will be replaced.Battery life depends on its capacity, operating temperature and signal transmission interval. When battery replacement becomesnecessary, use only a CR2050 or CR2032 type such as a Sony CR2050W orCR2032W.When the 490W is received, the handheld test instrument will only have a partial charge. Be sure to fully charge before using. Whenthe battery is low, the battery symbol will turn red. When this occurs, use the includedUSB charging cable and charging power adapter to recharge the unit.The handheld test instrument comes factory paired to the includedwireless pressure transducers.FEATURE OUTLINEFigure 1Headphoneconnection with integral protective rubber capSpeakerRugged protective housingHand strap clipCameraPower/sleep buttonVolume buttonsHandheld menu buttonHeadset speakerHandheld home buttonHandheld back buttonBacklittouchscreen LCDGoogle Play ™ is a trademark of Google, Inc.Select pair tomeasure pressure and flowTouch to mark transducer as highTouch SCANbutton to scan for transducersLow side is automatically selected oncehigh is chosenFigure 3Discovering the wireless pressure transducerIn the Sensor Discovery screen press the scan button to connect to transducers.Note: In this screen, up to three sets of transducers may be paired simultaneously to read differential pressure or up to six transducers may be may be paired to read single pressure.Be sure the selected transducers’ MAC addresses have the same maximum pressure. Each transducer is marked with a red(high) and blue (low) band to distinguish which transducer is high or low. Once the transducers are paired by MAC Address, select the High Side box for the transducer which has the red band. Its paired transducer will automatically be set to the low side. After the high and low transducers are marked, press the Selected box to choosepairs to use.The transducers will automatically go into low power/sleep mode to conserve battery energy. The transducers exit low power modeupon receiving communications from the Hydronic ApplicationTouch to start appFigure 2Touch to select valve make and modelTouch the NEXT button to proceed Dwyer Hydronic App OperationFirst turn on the handheld by pushing the power button (See Figure 1). Once fully powered on, unlock the handheld by swiping the screen to the right. The Dwyer Hydronic app is located at the bottom of the main screen. Click on the icon to open the app.Valve SelectionOnce the app is open, the Dwyer Hydronic App home screen will be shown. Press the START button. The Valve Selection screen will now be displayed. Press the make button to select a manufacturers valve. Then press the model button to select a valve model. In the list of valve manufacturers, there is an option to choose a manual valve. The flow coefficient (CV) is needed to use the manual valve, see Figure 2. Press the next button to proceed.When the app is opened, permission messages will pop up. Thiscan be bypassed by pressing ALLOW and can be permanently stopped by adding a Google Play ® account in the device’s settings menu.Printed in U.S.A. 8/18FR# 443142-52 Rev. 1©Copyright 2018 Dwyer Instruments, Inc.Reading Differential Pressure and FlowData can be collected in the Flow Reading screen after the transducers connection status indicates CONNECTED. The application converts differential pressure to flowdirectly on the screen.FCC RF EXPOSURE INFORMATION AND STATEMENTThe SAR limit of USA (FCC) is 1.6 W/kg averaged over one gram of tissue. Device types: S09 (FCC ID: ZHN-W63) has also been tested against this SAR limit. The highest SAR value reported under this standard during product certification for use at the ear is 0.430 W/kg and when properly worn on the body is 0.772 W/kg. This device was tested for typical body-worn operations with the back of the handset kept 1.5 cm from the body. To maintain compliance with FCC RF exposure requirements, use accessories that maintain a 1.5 cm separation distance between the user’s body and the back of the handset. The use of belt clips, holsters, and similar accessories should not contain metallic components in its assembly. The use of accessories that do not satisfy these requirements may not comply with FCC RF exposure requirements and should be avoided.This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) This device must accept any interface received, including interference that may cause undesired operation.Note: The manufacturer is not responsible for any radio or TV interference caused by unauthorized modification to this equipment. Such modifications could void the user’s authority to operate the equipment.This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try and correct the interference by one of more of the following measures: • Reorient or relocate the receiving antenna• Increase the separation between the equipment and receiver• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected• Consult the dealer or an experienced radio/TV technician for helpMAINTENANCE/REPAIRUpon final installation of the Model 490W, no routine maintenance is required. The Model 490W is not field serviceable and should be returned if repair is needed. Field repair should not be attempted and may void warranty.WARRANTY/RETURNRefer to “Terms and Conditions of Sale” in our catalog and on our website. Contact customer service to receive a Return Goods Authorization Number before shipping the product back for repair. Be sure to include a brief description of the problem plus any additional application notes.ZEROING THE TRANSDUCERSIn order for the transducers to be zeroed, place them near the location of the process connection. Note: Be sure to zero transducers outside the process connection without any pressure applied.In the Hydronic app, press the “Zero” button (Ø) to zero the pressure readings. The zeroing process will began by displaying a dialog box “Zeroing Please Wait”. Once the dialog box disappears, the transducers can be connected to the process connectionto read pressure.Zero button。
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MDM490型压阻式差压变送器
·全不锈钢结构设计，体积小巧重量轻，安装方便；
·激光焊接，全密封结构，外壳防护等级IP65；
·传感器为扩散硅压阻式差压传感器，不锈钢316L隔离膜片；
·经过了温度补偿和老化筛选，性能稳定可靠；
·产品可在外部调节零点和满度；
产品介绍
MDM490型差压变送器的敏感元件是一个固态压阻敏感芯片，在芯片和两个波纹膜片之间充有硅油。
被测差压作用到两端波纹膜片上，通过硅油把差压传递到敏感芯片上，敏感芯片通过导线与信号处理电路相连接。
该产品利用半导体硅材料的压阻效应，实现差压与电信号的转换。
由于敏感芯片上的惠斯登电桥输出的信号与差压有着良好的线性关系，所以可以实现对被测差压的准确测量。
适用于石油、化工、电力、水文等管道各种气体、液体的差压测量。
电气性能
供电电源：两线15V～28V DC三线15V～28V DC 输出信号：两线4mA～20mA DC三线0/1V～5V DC，0mA～10/20mA DC
电气连接：接插件或七芯电缆
响应时间（10%～90%）：≤1ms
绝缘电阻：100MΩ，50VDC
结构材料
壳体：不锈钢1Cr18Ni9Ti
波纹膜片：不锈钢316L
O型密封圈：氟橡胶
灌注液体：硅油
压力连接：G1/4内螺纹
环境条件
振动：在3gRMS，30Hz～2000Hz振动后变化≤1%冲击：在100g，10ms冲击变化≤1%
介质：与结构材料相适应的液体或气体。