两线制4-20mA输出
PMT系列粉尘浓度变送器是一款久负盛名、几乎免维护的一款电荷感应粉尘流动检测产品,能提供连续在线粉尘含量检测和除尘设备粉尘泄漏检测。
探头工作原理:采用电荷感应和探头保护技术,当粉尘微粒流经探头附近的时,微弱的电信号感应进入到探头中,一个DSP数字信号处理器处理此感应信号,成为一个线性比例与粉尘威力质量含量的绝对输出值。由于采用了探头保护技术和电荷感应技术,确保该探头能检测各种潮湿粉末和高导电粉尘,传感器为被动型(无电源和电子电路),基本免维护,非常耐用。
测量范围:>0.3微米的任何颗粒 探测等级:0.1PA 等效于0.1mg/m3, 0.5PA 等效于0.5mg/m3,5.0PA 等效于5.0mg/m3。
输出:4-20mA
优点:
1.比传统的摩擦电原理的粉尘探头具有更高的可靠性
2.满足美国国家环保局EPA认证
3.对于各种腐蚀、粘稠气体、水比较多,需要仪表本身比较耐磨损和防堵塞的场合.
应用场合
各种管道气体输送粉料,气体加压运输等以及布袋除尘(收尘设备),高炉余压发电TRT粉尘保护.严格和传统的摩擦电原理粉尘探头区分.
特性:
Service: Air and compatible gases, any type particulate conductive or nonconductive.
Wetted Materials: 304 SS and PTFE.
Air Velocity Range: 300 ft/min and higher.
Minimum Detection: Standard: 10.0 pA, Optional: 5.0 pA and 0.5 pA.
Temperature Limits: Ambient: -15 to 160°F (-25 to 70°C); Process: Standard: -40 to 250°F (-40 to 120°C); Optional: -40 to 450°F (-40 to 232°C).
Pressure Limit: 10 psi (0.69 bar).
Power Requirement: 18-28 VDC (24V Nominal).
Output Signal: 4-20 mA.
Loop Resistance: 300 Ohms maximum.
Current Consumption: Powered from 4-20 mA loop.
Electrical Consumption: Terminal Block.
Process Connection: See Model Chart on .
Enclosure Rating: Weatherproof, NEMA 4X (IP 66).
Mounting Orientation: Any.
Weight: Varies with length of probe and type of mount.
Agency Approvals: CE Ordinary bs only, CSA
选型表
EXAMPLE PMT A1 1 T1 P1 1 L1.5 PMT-A11T1P1-L1.5 Particulate Transmitter, ordinary/general purpose bs, CE approval, NEMA 4X, CSA, , 1/2" NPT connection, 250°F max. temp., 10 psi max. pressure, 10.0-5000 pA, 1.5" probe. SERIES DESIGNATOR PMT PMT Particulate Transmitter (1-piece configuration, sensor included in price) ENCLOSURE RATING A1 Ordinary/General Purpose Locations, CE Approval, NEMA 4X, CSA AHZ2 Hazardous Location, CSA Approval, Class I, Division II, Groups A-D; Class II, Groups F,G PROCESS CONNECTION 1 1/2" NPT 2 1.5" Quick Clamp Connection 3 2" 150# ANSI Flange 4 2" 150# ANSI Flange with Process Mating Flange and Installation Kit. MAXIMUM PROCESS T1 250°F (121°C) TEMPERATURE T2 450°F (232°C) MAXIMUM PROCESS P1 10 psi PRESSURE RANGE 1 10.0-5000 pA 2 5.0-5000 pA 3 0.5-5000 pA (required for low levels or EPA leak detection) INSERTION LENGTH L1.5 1.5" Probe (recommended at L03 3" Probe least 1/2 duct diameter) L05 5" Probe L10 10" Probe L15 15" Probe L20 20" Probe L30 30" Probe L36 36" Probe