描述
一、产品概述
品牌与系列：
Westinghouse（西屋电气，现属美国通用电气GE旗下，工业控制业务独立运营，部分产品仍沿用原品牌）。
产品类型：压力变送器（或差压变送器，具体需根据型号确认，4256系列常见于过程控制领域）。
核心定位：用于工业流程中压力/差压的精确测量与传输，适用于石油、化工、电力、冶金等行业的自动化控制系统。
二、关键参数与功能
1.测量范围
压力类型：
表压（Gauge）：测量相对于大气压的压力（如0-100kPa）。
绝压（Absolute）：测量相对于真空的压力（如0-100kPa abs）。
差压（Differential）：测量两点间压力差（如0-10kPa差压）。
注：具体范围需参考型号手册（4256A88G04可能为定制型号，范围可能为0-100kPa或0-1MPa）。
过载能力：
典型值：2倍量程（如量程0-100kPa时，可承受200kPa瞬时过压）。
2.精度与稳定性
精度等级：
基本精度：±0.075%FS（满量程，典型值，优于行业标准±0.1%）。
长期稳定性：±0.1%FS/年（减少校准频率，降低维护成本）。
温度影响：
零点漂移：±0.015%FS/℃（补偿后）。
量程漂移：±0.02%FS/℃（补偿后）。
3.输出信号
模拟输出：
4-20mA DC（两线制，行业标准，抗干扰能力强）。
可选信号：0-10V DC（三线制，需确认型号是否支持）。
数字通信：
HART协议（支持远程配置、诊断及多变量传输）。
可选协议：FOUNDATION Fieldbus、PROFIBUS PA（需确认型号是否支持）。
I.Product Overview
Brand and Series:
Westinghouse(Westinghouse Electric,now a subsidiary of General Electric,operates independently,with its industrial control business operating independently;some products continue to use the original brand).
Product Type:Pressure transmitter(or differential pressure transmitter,depending on the model number;the 4256 series is commonly used in process control).
Core Positioning:Used for precise measurement and transmission of pressure/differential pressure in industrial processes,suitable for automation control systems in industries such as petroleum,chemical,power,and metallurgy.
II.Key Parameters and Functions
1.Measurement Range
Pressure Type:
Gauge:Measures pressure relative to atmospheric pressure(e.g.,0-100 kPa).
Absolute:Measures pressure relative to a vacuum(e.g.,0-100 kPa abs).
Differential:Measures the pressure difference between two points(e.g.,0-10 kPa differential).
Note:Please refer to the model manual for specific ranges(4256A88G04 may be a custom model with a range of 0-100 kPa or 0-1 MPa).Overload Capacity:
Typical value:2 times the full scale(e.g.,with a range of 0-100 kPa,it can withstand a 200 kPa transient overpressure).
2.Accuracy and Stability
Accuracy Grade:
Basic Accuracy:±0.075%FS(full scale,typical value,better than the industry standard of±0.1%).
Long-Term Stability:±0.1%FS/year(reduces calibration frequency and reduces maintenance costs).
Temperature Effect:
Zero Drift:±0.015%FS/°C(after compensation).
Span Drift:±0.02%FS/°C(after compensation).
3.Output Signal
Analog Output:
4-20 mA DC(two-wire,industry standard,with strong anti-interference capabilities).
Optional Signal:0-10 V DC(three-wire,please confirm model support).
Digital Communication:
HART Protocol(supports remote configuration,diagnostics,and multi-variable transmission).Optional protocols:FOUNDATION Fieldbus,PROFIBUS PA(need to confirm whether the model supports it).
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