890 系列压力变送器/ 传感器 

3A 卫生级压力传感器

概述/设计原理: 

890系列产品符合卫生级设计3A标准，采用全封闭密封，可承受外部高压冲洗。所有元件组装于加固焊接不锈钢外壳内，对外部振动、冲击及极端环境的影响。外形小巧且卡式连接卫生压力设备允许直接安装于多数CIP和SIP中。其它特性包括基于IC的电路系统、螺纹尺寸为1/2 ”的电路装置和屏蔽电缆、配备通风管。密封螺钉可实现调零和跨程调节.  

工作原理: 

不锈钢隔膜和绝缘电极共同构成可变电容器。隔膜电压改变传感器电容，电容经检测由电子电路系统将其转换为4-20毫安的高精度线性电子信号，电子电路系统符合Gems Sensors & Controls'的电平衡原理。低磁滞，高运行稳定性与可忽略钳位效应一致. 

应用: 

• 食品生产 
• 奶制品及饮料生产 
• 药品生产 
• 卫生级管道 

Specifications
Input
Pressure Range		1-1,000 psig
Proof Pressure		See ordering chart
Burst Pressure		See ordering chart
Fatigue Life		>1 million cycles
Performance
Output		4-20 mA (2 Wire)
Supply Voltage (Vs)		18-38 Vdc
Accuracy		0.20% FS
Thermal Error Zero		0.02% FS/°F (±0.036% FS/°C)
Thermal Error Span		0.02% FS/°F (±0.036% FS/°C)
Compensated Temperature		20°F to +180°F (-7°C to +80°C)
Operating Temperatures		-40°F to +260°F (-40°C to +125°C)
Storage Temperatures		-65°F to +260°F (-54°C to +125°C)
Zero Tolerance		1% of span (±0.5 mA adjustable)
Span Tolerance		1% of span (±0.5 mA adjustable)
Max. Loop Resistance		(Vs-18) x 50
Response Time		10 ms
Mounting Effects		.15% FS (.25% FS for 1.5" Tri-Clover)
Mechanical Configuration
Pressure Port		1.5" or 2" Tri-Clover Sanitary Fitting
Wetted Parts		316 Stainless Steel
Electrical Connection		1/2" NPT Conduit Fitting and Strain Relief with 15 ft Cable
Enclosure		Stainless Steel
Vibration		10g Peak Sinusoidal, 50 to 1000 Hz
Acceleration		10g
Shock		50g
Approvals		Meets 3-A Sanitary Standards
Weight		8 oz