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.

DWYER PMT系列粉尘浓度变送器 

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 locations only, CSA

选型表

EXAMPLE
 PMT
 A1
 1
 T1
 P1
 1
 L1.5
 PMT-A11T1P1-L1.5 Particulate Transmitter, ordinary/general purpose locations,
 
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
 

 
 DWYER PMT系列粉尘浓度变送器