兩線制4-20mA輸出
PMT系列粉塵濃度變送器是一款久負(fù)盛名、幾乎免維護(hù)的一款電荷感應(yīng)粉塵流動檢測產(chǎn)品，能提供連續(xù)在線粉塵含量檢測和除塵設(shè)備粉塵泄漏檢測。
探頭工作原理：采用電荷感應(yīng)和探頭保護(hù)技術(shù)，當(dāng)粉塵微粒流經(jīng)探頭附近的時，微弱的電信號感應(yīng)進(jìn)入到探頭中，一個DSP數(shù)字信號處理器處理此感應(yīng)信號，成為一個線性比例與粉塵威力質(zhì)量含量的絕對輸出值。由于采用了探頭保護(hù)技術(shù)和電荷感應(yīng)技術(shù)，確保該探頭能檢測各種潮濕粉末和高導(dǎo)電粉塵，傳感器為被動型(無電源和電子電路)，基本免維護(hù)，非常耐用。
測量范圍：>0.3微米的任何顆粒 探測等級：0.1PA 等效于0.1mg/m3， 0.5PA 等效于0.5mg/m3，5.0PA 等效于5.0mg/m3。
輸出：4-20mA
優(yōu)點(diǎn)：
1.比傳統(tǒng)的摩擦電原理的粉塵探頭具有更高的可靠性
2.滿足美國國家環(huán)保局EPA認(rèn)證
3.對于各種腐蝕、粘稠氣體、水比較多,需要儀表本身比較耐磨損和防堵塞的場合.
應(yīng)用場合
各種管道氣體輸送粉料,氣體加壓運(yùn)輸?shù)纫约安即龎m(收塵設(shè)備),高爐余壓發(fā)電TRT粉塵保護(hù).嚴(yán)格和傳統(tǒng)的摩擦電原理粉塵探頭區(qū)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
選型表
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