生产资料市场化以后,加剧激烈的竞争, 变送器(图3)真假优劣难辨,又因变送器是边缘学科,很多工程设计人员对此较陌生,有些厂家产品工业级别和民用商用级别指标混淆(工业级的价格是民用商用级的2-3倍)。
以常用的0.5级精度的电流电压变送器为例,从以下方法着手来辨别真假优劣:
1、基准要稳,4mA是对应的输入零位基准,基准不稳,谈何精度线性度,冷开机3分锺内4mA的零位漂移变化不超过4.000mA0.5%以内;(即3.98-4.02mA),负载250Ω上的压降为0.995-1.005V,国外IC芯片多用昂贵的能隙基准,温漂系数每度变化10ppm;
2、内电路总计消耗电流<4mA,加整定后等于4.000mA,而且有源整流滤波放大恒流电路不因原边输入变化而消耗电流也随之变化,国外IC心片采用恒流供电;
3、当工作电压24.000V时,满量程20.000mA时,满量程20.000mA的读数不会因负载0-700Ω变化而变化;变化不超过20.000mA0.5%以内;
dSpace RTI-ETHERNET-IO-USB
SCHUNK PGN 80-2 AS 371451
BEKO XEKA14001 230VAC
BRAUN E1553
MTS RHM0225MD531P102
VAHLE KSFU25PH
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REXROTH R900984240
WEBER NT00C-125A
TR 338-00002
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RITTER+BADER 4061932 045-100-0702
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LEGRAND TYPE:143 40
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ASUTEC ASM-20/60
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WIKA WUC-1X(-30INHG-3000PSI)
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ZIEHL-ABEGG RE18P-2DK.1E.1R nr:123531
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WIKA s-10/G1/40-100bar/3-wire
PHOENIX 3200014
DYNISCO DYMT-S-1/2-PT100/3-15-15-G
CMR 231A0000P0300M12 P-Sensor 0-300 Pa Dual 24Vdc
MPM 3.AB300P01.C
NOVOTECHNIK TLH 1100F nr95523k Art.nr025344
SAFIM MO17351/100F
SUN PRDM-XEV-224
R+W SLN/30/W/16/35/30-80
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JUD F-1015 4-20MA 220VAD
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NARDA 42ka-251B-6
PHOENIX 2864422 MINI MCR-SL-RPS-I-I
NOVOTECHNIK MUP 110-4 24V/DC
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SCHUNK PFH 50夹爪 订货号是:5510472
MOOG D953-2105/C
SETRA 2251Z05PCD4N1B1
EFTEC 20030217
HEIDENHAIN ID325413-01
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SPIRAXSARCO SP400
HYDAC SB330-10A1/112A9-330A
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上海祥树FLOWXFLX-C2/5
上海祥树FLOWXFLX-C2/5