描述
Bently Nevada 990-05-70-01-00是一款振动变送器，主要用于工业设备的振动监测。以下是其详细信息：
基本参数
尺寸：25cm×28cm×10cm。
重量：2kg。
原产国：美国。
输入：接受1个非接触式的3300 NSv接近探头和延长电缆。
电源：变送器终端需要+12至+35Vdc的输入。
信号输出：4至20mA直流信号，两线制，全量程范围内回路准确性在±1.5%。
最大回路阻抗：1000Ω，35Vdc供电电缆。
频率响应：5Hz至6000Hz+0，-3dB。
功能特点
集成化设计：集成了前置器单元，无需外部装置，简化了系统结构。
信号输出多样：非隔离的“PROX OUT”和“COM”端子加上同轴连接器可提供动态的振动和间隙电压信号输出，以便进行故障诊断，同时提供4至20mA的工业标准输入信号用于控制系统。
调节方便：零点电位器和量程电位器支持回路调节，相互间不会制约，便于用户进行精确的参数设置。
信号稳定可靠：上电抑制电路可消除由于线路瞬变电压信号而导致的错误；非正常/信号故障电路可防止由于接近探头发生故障或连接松动而导致的高输出或假警报。
安装简便：可选择DIN导轨压板或隔板固定螺钉作为标准选配件，简化安装过程。
环境适应性强：密封结构适用于高湿度（高达100%结露）环境，能在恶劣的工业环境中稳定工作。
应用领域：主要用于离心式空气压缩机、小型水泵、电机或风机等设备的原始设备制造商（OEM），为其提供简单的4至20mA比例振动信号，以便接入设备的控制系统，实现机组的保护、报警和逻辑控制。
The Bently Nevada 990-05-70-01-00 is a vibration transmitter designed primarily for vibration monitoring in industrial equipment.The following are its details:
Basic Parameters
Dimensions:25cm×28cm×10cm.
Weight:2kg.
Country of Origin:USA.
Input:Accepts one non-contact 3300 NSv proximity probe and extension cable.
Power Supply:The transmitter requires a+12 to+35Vdc input.
Signal Output:4 to 20mA DC signal,two-wire,with a loop accuracy of±1.5%over the full range.
Maximum Loop Impedance:1000Ω,35Vdc power cable.
Frequency Response:5Hz to 6000Hz+0,-3dB.
Features
Integrated Design:The preamplifier unit is integrated,eliminating the need for external devices and simplifying system architecture.Versatile Signal Outputs:Non-isolated”PROX OUT”and”COM”terminals plus a coaxial connector provide dynamic vibration and gap voltage signal outputs for fault diagnosis,while an industry-standard 4 to 20 mA input signal is also available for control systems.
Easy Adjustment:The zero and span potentiometers support loop adjustment without interfering with each other,facilitating precise parameter settings.
Stable and Reliable Signals:A power-on suppression circuit eliminates errors caused by line transients;an abnormal/signal failure circuit prevents high outputs or false alarms caused by a faulty proximity probe or loose connections.
Easy Installation:Optional DIN rail mounting plates or bulkhead mounting screws simplify installation.
Environmentally Reliable:The sealed construction is suitable for high humidity(up to 100%condensation)environments and provides stable operation in harsh industrial environments.Applications:Mainly used by original equipment manufacturers(OEMs)of centrifugal air compressors,small water pumps,motors,fans,and other equipment to provide a simple 4 to 20 mA proportional vibration signal for connection to the equipment’s control system to implement unit protection,alarms,and logic control.
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