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Differential PressureGages/Switches, DialPRESSURESeriesA3000Photohelic®Pressure Switch/Gages3-in-One Indicating Gage, Lo-Limit and Hi-Limit Control 2-1/2 [63.50]2-1/16 [52.39]2 [50.80]1-1/4[31.75](4) 6-32 HOLESEQUALLY SPACED ONA 5-1/8 [130.18] B.C.Ø4-47/64[120.25]Ø5[127.00]Ø4 [101.60]FACE5-1/2 [139.70] O.D.MOUNTING RING5/8 [15.88]5/8 [15.88] PANEL MAX3/16 [4.76]3-7/8 [98.43]5-1/8 [130.18]6-3/8 [161.93](7-5/8 [193.68])4-3/8 [111.13]HOUSING REMOVAL3/4 CONDUITCONNECTIONØ4-3/4[120.65]3-7/8 SQ[98.43]1/8 FEMALE NPT HIGH PRESSURE CONNECTION1/8 FEMALE NPT LOWPRESSURE CONNECTION
Set points are instantly adjusted with front knobs.SPECIFICATIONSGAGE SPECIFICATIONSService: Air and non-combustible, compatible gases.Wetted Materials: Consult factory.Accuracy: ±2% of FS at 70°F (21.1°C). ±3% on -0 and ±4% on -00 models. Pressure Limits:-20˝ Hg. to 25 psig (-0.677 to 1.72 bar). MP option; 35 psig(2.41 bar), HP option; 80 psig (5.52 bar). A36003S – 36010S; 150 psig (10.34bar). A36020S and higher; 1.2 x full scale pressure. Temperature Limits: 20 to 120°F (-6.67 to 48.9°C). Low temperature optionavailable. Process Connections:1/8˝ female NPT. Size:4˝ (101.6 mm) dial face, 5˝ (127 mm) O.D. x 8-1/4˝ (209.55 mm).Weight:4 lb (1.81 kg). SWITCH SPECIFICATIONSSwitch Type: Each setpoint has 2 form C relays (DPDT).Repeatability: ±1% of FS.Electrical Rating:10A @ 28 VDC, 10A @ 120, 240 VAC. Electrical Connections: Screw terminals. Use 167°F (75°C) copper conductors only.Power Requirements: 120 VAC, 50/60 Hz; 240 VAC & 24 VAC poweroptional.Mounting Orientation: Diaphragm in vertical position. Consult factory forother position orientations.Set Point Adjustment: Adjustable knobs on face. Agency Approvals:UL, CSA, CE. Optional-EXPL explosion-proof enclosure does not possess any agency approvals.OPTIONSSingle contact,right set point, for actuation on increasing or decreasingpressure.OEM Model,less relay and transformer components and housing but includinginfrared diodes and phototransistor(s), light shutter and set pointer(s). For singleor double contact.Remote-Mounted Relay,relay pack may be mounted remotely from gage.Standard length is 5 ft. For other lengths, specify cable length required. Tamper-proof knobs,low temperature option, special scales, voltages andother features and modifications are available. Special Housings available include Weatherproof (NEMA 4) and Explosion-proof (NEMA 7 CD, 9 EFG; NEC ClassI, DIV. 1 & 2, Groups C, D, Class II, Div.1 & 2, Groups E, F, G, Class III.) Contact Customer Service for detaileddimension drawings.Photohelic®Switch/Gagesfunction as versatile, highly repeatable pressureswitches combined with a precise pressure gage employing the time-provenMagnehelic®gage design. The Photohelic®gage measures and controls positive,negative or differential pressures of air and compatible gases. Standard models arerated to 25 psig (1.7 bar) with options to 35 (2.4) or 80 (5.5 bar) psig. Single pressure36000S models measure to 6000 psig (413 bar) with a 9000 psig (620 bar) rating.Two phototransistor actuated, DPDT relays are included for low/high limit control.Easy to adjust setpoint indicators are controlled by knobs located on the gage face.Individual setpoint deadband is one pointer width — less than 1% of full scale.Setpoints can be interlocked to provide variable deadband — ideal for control of fans,dampers, etc. Gage reading is continuous and unaffected by switch operation, evenduring loss of electrical power. Choose from full scale pressure ranges from a low 0-.25" (0-6 mm) w.c. up to 30 psi (21 bar); single positive pressure to 6000 psig (413 bar). Photohelic Sensing - How It WorksIn typical applications, these Dwyer switch/gages control between high andlow pressure set points. When pressure changes, reaching either set pointpressure, the infrared light to the limiting phototransistor is cut off by the helix-driven light shutter. The resulting phototransistor signal is electronicallyamplified to actuate its DPDT slave relay and switching occurs. Dead bandbetween make and break is 1% of full scale or less — just enough to assurepositive, chatter-free operation. Relay - Transformer FeaturesA plastic housing protects all electronic components. Solid-state and integratedcircuit electronics are on glass-epoxy printed circuit boards and self-extinguishing terminal boards.APPLICATIONS - PHOTOHELIC®SWITCH/GAGESIn both series of pressure switch/gages, you get the convenience of a visualindication plus high-low limit switching. For both OEM and in-plant applications,the Photohelic®switch/gage is used to control pressures in air conditioningsystems, clean rooms, fluidic and pneumatic control systems, materialshandling equipment, alarm or control fume exhaust systems, control pressurein air structures, and monitor respiratory and blood pressures.Standard ModelTwo phototransistor-actuated circuits and two DPDT relays permit both highand low alarms or limit controls. Relays are de-energized when gage pointeris to the left of respective set points; relays are energized as pointer passes tothe right of set points. Loss of electrical power or loss of pressure provide “failsafe” protection.High and Low Latching CircuitsDwyer Photohelic®switch/gages can be wired for high-latching, low-latchingor combination high-low latchingcircuits. That is, the equipment will hold inthese respective positions once activated and until manually reset. This canbe particularly useful for alarm and signal applications where control isaccomplished by another Photohelic®switch/gage or other means. Completewiring and operational instructions are included. Where manual reset isrequired a dry circuit push button such as Dwyer Part A-601 should be used.
Pressure and differential pressure regulators2d Internet: /catalogue/...
Subject to change – 2020/07Pressure and differential pressure regulators
Product range overviewFunctionDesignTypePneumatic connectiona Page/InternetThreadFor tubing O.D. [mm]
4681012
Pressure regulator without pressure gaugeWith push-in connector and connecting thread
LR-...-QS-...M5hh–––3
R1/8hhh––
R1/4–hh––
With push-in connector at both ends
LR-QS-...–
hhh––3
Pressure regulator with pressure gaugeWith push-in connector and connecting thread
LRMA-...-QS-...M5hh–––6
R1/8hhh––
R1/4–hh––
With push-in connector at both ends
LRMA-QS-...–
hhh––6
Differential pressure regulator without pressure gaugeWith push-in connector at the top and connecting thread
LRL-...-QS-...M5hh–––9
R1/8hhh––
R1/4–hhh–
R3/8––hhh
R1/2––––h
With push-in connector at the side and connecting thread
德威尔仪器仪表有限公司亚太地区办公室,澳大利亚,Dwyer Instruments Pty Ltd,Unit 4,11 Waverley Drive,P.O.Box 359,Unanderra NSW 2526,Australia,电话：+61 2 4272-2055 传真：+61 2 4272-2055
49/压力/真空型号477A-1477A-2477A-3477A-4477A-5477A-6477A-7英制范围0-20.00 英寸水柱0-40.00 英寸水柱0-200.0 英寸水柱0-10.00 psi0-30.00 psi0-50.0 psi0-100.0 psi公制范围0-5 kPa0-10 kPa0-50 kPa0-70 kPa0-200 kPa0-350 kPa0-700 kPa最大压力3 psi (0.21 bar)3 psi (0.21 bar)15 psi (1.03 bar)30 psi (2.07 bar)60 psi (4.13 bar)100 psi (6.89 bar)200 psi (13.78 bar)库存型号手持式数字差压计空气差压精确测量，精度达到±0.1%系列477A•测量正压，负压的或差压•可快速选择到九种量程的英制/公制单位•可存储20 条记录以备后用•声光过压报警•使用一节9 伏电池。就可连续工作100 小时技术指标介质：空气和不可燃混合气体材质：可与厂家协商精度：满量程的±0.10% 从60 到78°F（15.6 ~ 25.6°C）；满量程的±1% 32-60 和78-104°F（0-15.6 和25.6-40°C）压力滞后：满量程的±0.1%压力范围：查看表格温度范围：32 至104°F（0 至40°C）存储温度范围：-4 至176°F（-20 至80°C）显示：0.42˝（10.6 mm）4-1/2˝ 液晶显示分辨率：查看表格电源配置：9 伏碱性电池。带有电池但未安装重量：10.2 oz.（289 g）连接：两个快速接头用于1/8˝（3.18 mm）或3/16˝（4.76mm）内径管仅用于477A-1，477A-2，477A-3，477A-4和477A-5。两个压紧接头用于1/8˝（3.18 mm）内径x1/4˝（6.35 mm）外径管仅用于477A-6 和477A-7。德威尔477 型号中最新的477A 型压力计的测量精度可达到满量程的0.1%。477A 系列包含一个高精度的差压传感器，测量范围从20˝英寸水柱到100psid 都能保证满量程的0.1% 的精确度。这种手持式数字差压计比过去前进了一大步，使测量更快，更简单，更精确。它可以快速选择到九种广泛应用的压力单位，不必浪费时间在容易出错的枯燥的转换上。一个永久存储器可存20 条读数-非常适合于采暖通风空调技师用皮托管测量通过管道的气流。477A 系列也是维护人员和技师需要的，用作高精度标准来检验他们的仪器或设备的性能是否合适。当工作在光线条件较差的地方时，可打开便利的背景光。压力计会在2 分钟后自动关闭背景光以节约电池。电子零位只需简单的按动一个键就可以完全清除压差。显示键HOLD 可以保持当前压力读数防备常常遇到的读数跳动情况。带有声光报警以防止万一周围环境噪声等级过高听不见报警声音。同时声音警报也可用于确定数值是否被存储，不必要在测量中一直盯住显示器观察。各个功能的清晰，简明的使用说明书印在坚固的铝制外壳的后面，便于快速参考。一整块前面板隔膜完全保护所有按键防止灰尘和湿气，可以快速擦除。包含详细的说明书，一个手腕带和一节9伏电池。
数字万用表DT9205使用说明书(适合初学者)
一、概述
本仪表以大规模集成电路、双积分A/D(模/数)转换器为核心，配以全功能过载保护电路，可用来测量直流和交流电压、电流、电阻、电容、二极管、三极管、温度、频率、电路通断等。
相关术语及仪表盘上的名词解释：
LCD/液晶显示屏；
交流电的有效值用字母rms表示.例如,市电峰值为311V,有效值为220Vrms；
模/数转换器是模拟信号与数字信号相互转换的电子元件；
按下仪表盘左上的HD键可以保持LCD数据键；
仪表盘下方FUSED表示该量程有保险管,UNFUSED表示无保险管；
15SEC是指测试时间限于15秒
二、特点
1. 功能选择具有32个量程.
量程与LCD有一定的对应关系:选择一个量程,如果量程是一位数,则LCD上显示一位整数,小数点后显示三位小数;如果是两位数,则LCD上显示两位整数,小数点后显示两位小数;如果是三位数,则LCD上显示三位整数,小数点后显示一位小数;有几个量程,对应的LCD没有小数显示.
2. 测试数据显示在LCD中.
3. 过量程时,LCD的第一位显示 "1",其他位没有显示.
4. 最大显示值为1999(液晶显示的后三位可从0变到9，第一位从0到1只有两种状态，这样的显示方式叫做三位半。)
5. 全量程过载保护
6. 工作温度: 00C-400C
储存温度：-100C -- +500C 7. 电池不足指示：LCD液晶屏左下方显示
三、技术指标
精确度:±(%读数+第四位上的字数).注意:括号内的第2部分,为精确度的修正值,应放在该档位的最后一位数字上.精确度保证期为1年
例如:一个电子元件在200档位的读数为,该档位精确度标示为±(5%+2),该档位在LCD中有一位小数
则这个电子元件的实际数据a,介于不等式
100-(5%×+≤a≤100+(5%×+
