DWYER德威尔 A3000-1KPA A3000-2KPA A3000-3KPa 指针式差压开关

订货时，请注明电源类型，电源类型标准为100VAC，可选230VAC电源，24VAC电源

如需要选择24VDC，请选用3000MR系列

Specifications产品介绍

GAGE SPECIFICATIONS 介质Air and non-combustible, compatible gases.接液材质Consult Factory.精度±2% of FS at 70°F (21.1°C). ±3% on -0 and ±4% on -00 models.压力范围:-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).温度范围:20 to 120°F. (-6.67 to 48.9°C). -20 to 120°F (-28 to 48.9°C) with low temperature option.过程连接:1/8" female NPT.表盘尺寸4" (101.6 mm) dial face, 5" (127 mm) O.D. x 8-1/4" (209.55 mm).重量:4 lb (1.81 kg).

 

SWITCH SPECIFICATIONS开关类型:Each setpoint has 2 Form C relays (DPDT).Repeatability:±1% of FS.Electrical Rating:10 A @ 28 VDC, 10 A @ 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 power optional.Mounting Orientation:Diaphragm in vertical position. Consult factory for other position orientations.Set Point Adjustment:Adjustable knobs on face.Agency Approvals:CE, CSA, UL.

Features

• Bezel and front cover (with set point knobs and zero adjustment screw) removed to expose Photohelic® switch/gage set point mechanism. Cover is clear polycarbonate plastic.
• Gage pointer and light shutter are mounted on helix and balancing counterweight. Shutter passes through slot in optical limit switch to expose phototransistors to integral infrared light source or mask them depending on applied pressure.
• Light shield effectively protects phototransistors from strong outside light sources yet allows free pointer movement. It also gives interior a clean "finished" look.
• Optical limit switches are used for reliability and long service life. Attached directly to set pointers, they are individually aligned to assure precise switching accuracy.
• Semi-Flexible drive shaft connects to set point knobs.
• Zero adjustment screw connects to screw in cover to adjust zero pressure reading.
• Plastic enclosure protects electronic components and electrical connections.
• Polycarbonate connection or terminal board is self-extinguishing.
• Glass epoxy printed circuit boards for durability and permanence.
• Load relays are DPDT with latching feature for maximum application versatility.
• Electronics are designed to operate on 50/60 Hz, 120 volt current with 10% over or under voltage. Special units for other voltages are available.
• Switch set pointers show switch settings at all times.
• Spring loaded friction clutch prevents operator damage of set point mechanism.
• 3-in-1 instrument allows the reduction of several instruments with one product, saving inventory, installation time and money.
• Patented design and 1% full scale dead band provides quick response to pressure changes means no delay in switching and chatter-free operation.
• A wide range of models that can meet pressure measurement specifications from low to very high.

Options

PHOTOHELIC传感--工作原理

典型的应用场合，这些Dwyer开关/表在高、低压设置点之间进行控制。当压力变化达到高极或低限设定点的压力时，限制光耦的红外灯螺旋驱动快门熄灭。光耦信号经过放大去驱动DPDT继电器产生开关动作。死区为满刻度的1%或更小--足够保证的，无振动工作。

 

继电-变压器的特点

塑料外壳保护了所有的电器元件。固态集成电路被装配在环氧树脂玻璃电路板和自动熄灭终端板上。（仅对于A3000系列）

 

应用--PHOTOHELIC 开关/表

压力开关/表为您提供压力指示和高/低限开关控制。对于OEM和现场应用，Photohelic开关/表被用于空调系统、洁净室、液压和气动控制系统、材料处理设备，报警和控制废气排放系统，控制气体结构的压力和血流监测和呼吸检测。

差压开关/表

表盘和前盖(带有设定点按钮和调零螺钉)：移开表盘和前盖，就可露出Photothelic设定点机制，前盖是通明碳酸脂塑料.

指针和光闸： 安装在螺旋线和平衡码上。打开光闸，光电晶体管就暴露在红外线下，根据所使用压力可把光电晶体管罩起来。

遮光屏：有效保护光电晶体管，避免户外强光的照射。在遮光屏的掩护下，指针可自由摆动，表盘内显得非常清晰和洁净。

限位开关：可靠，使用寿命长。直接附加在设定指针上，但它们单独校准过，以确保开关精度。

可弯曲驱动轴：与设定点旋钮相连。

调零螺杆：与表盘上螺钉相连。

塑料外壳：保护电子元件和电器连接。

聚碳酸脂接口或终端板具有防火性能。

压制在氧化玻璃上的线路板：性能好，经久耐用。

负载继电器：DPDT，具有自锁特征，应用广。

电气：其设计使用50/60Hz, 110V的电流，其电压允许上下浮动10%。特殊仪表可使用其它电压如：220VAC，24VAC。

开关设定指针：时刻显示开关的位置。

弹簧负载摩擦离合器：防止操作人员损伤设定机制。

Dwyer差压开关A3000-15CM A3000 20CM  A3000-25CM A3000-50CM  A3000-80C A3000-100Cm A3000-150CM

A3000-200CM  A3000-250CM   A3000-300CM

A3000-6MM A3000-10MM A3000-25MM A3000-50MM A3000-80MM A3000-100MM

A3000-60PA A3000-125PA A3000-250PA A3000-500PA  A3000-750PA

A3000-1kPA A3000-1.5kPA A3000-2kPA A3000-3kPA A3000-4kPA A3000-5kPA A3000-8kPA A3000-10kPA  A3000-15kPA A3000-20kPA  A3000-25kPA  A3000-30kPA A3300-0

A3301 A3302 A3304 A3310 A3320 A3330 A3000-00 A3000-0 A3001 A3002 A3003

A3004 A3005 A3006 A3008 A3010 A3015 A3020 A3025 A3030 A3040 A3050

A3060 A3080 A3100 A3150

A3300-1kPA

A3300-3kPA