DPT-20 差压式变送器 食品饮料 石化 工艺 高测量准确度

应用

• 工艺工程

• 化工行业

• 石化行业

• 食品饮料行业

• 机械制造和设备制造

功能特性

• 高测量准确度

• 测量量程可以自由调整

• 满足SIL 2要求

• 7种不同外壳可选

描述

DPT-20型压力变送器有本安型和隔爆型两种版本，且支持4 ... 20 mA、4 ... 20 mA HART®、FOUNDATION™ Fieldbus或PROFIBUS® PA输出信号，可满足相应系统的应用要求。该款变送器是根据SIL（安全完整性等级）IEC 61508要求开发的，可适用于有特殊安全要求的工况。

通用型

DPT-20型可满足各种工业测量需求，如使用压差元件测量流量、开放及密闭罐体内的液位测量或过滤器和泵的监测。安装隔膜后，DPT-20也适合用于严苛的工艺条件。该型号变送器的测量范围为-1 ... +1 kPa至-1.6 ... +1.6 MPa [-0.15 ... +0.15 psi 至 -240 ... +240 psi]，静压限值高达40 MPa [5,800 psi]，因此它可满足任何应用要求。此外，该型号变送器结合了内部数字信号处理和成熟的传感器，可确保高准确度和的长期稳定性。

有七种不同外壳可供选择，因此可以选择相应外壳以适合不同操作环境。外壳可以自由旋转 330°，主要有塑料、铝和不锈钢三种材质。
对于有高应用要求的食品行业和制药行业，还可提供电抛光的不锈钢 (316L) 外壳。

易于配置和操作

用户可通过带操作模块的显示器（可选）对仪表进行配置和维护，其中显示模块可以安装在四个不同位置。操作菜单结构合理，简单易懂并且具备多种可选语言。此外，用户还可使用免费的 PACTware™ 配置软件来设置运行参数。仪表专用的 DTM 可以将仪表轻松地集成到相应的过程控制系统中。

Accuracy specifications Measuring deviation determined using the limit point method IEC 62828/IEC 61298 1) Differential pressure Measuring ranges 10 and 30 mbar [0.15 and 0.45 psi] ■ TD ≤ 5:1 ±0.1 % of span ■ TD > 5:1 ±0.02 % x TD Measuring range 100 and 500 mbar [1.5 and 7.5 psi] ■ To TD 10:1 ±0.065 % of span ■ TD > 10:1 ±0.035 % + 0.01 % x TD Measuring range 3 bar [45 psi] ■ To TD 10:1 ±0.065 % of span ■ > TD 10:1 ±0.015 % + 0.005 % x TD Measuring range 16 bar [240 psi] ■ To TD 10:1 ±0.065 % of span ■ > TD 10:1 ±0.035 % + 0.01 % x TD Static pressure <±0.1 % (scaling with static pressure is not possible) Adjustability, differential pressure Pressure value of zero point -120 ... +120 % of the nominal measuring range (with -100 ... +100 mbar [-1.5 ... +1.5 psi] measuring range, 100 mbar [1.5 psi] is the nominal measuring range) Pressure value of span Zero point + (-240 … +240 %) Adjustability, level Percentage value -10 … + Pressure value -120 … +120 % Adjustability, flow Pressure value of zero point -120 … +120 % Pressure value of span -120 … +120 % Influence of mounting position <0.35 mbar [0.003 psi] per 10° inclination from the vertical Influence of the medium and ambient temperature -10 ... +60 °C [14 ... 140 °F] Measuring range 10 mbar [0.15 psi] <±0.15 % + 0.2 % x TD Measuring range 30 mbar [0.45 psi] <±0.15 % + 0.1 % x TD Measuring range 100 mbar [1.5 psi] <±0.15 % + 0.15 % x TD Measuring range 500 mbar [7.5 psi] <±0.15 % + 0.05 % x TD Measuring range 3 bar [45 psi] <±0.15 % + 0.05 % x TD Measuring range 16 bar [240 psi] <±0.15 % + 0.15 % x TD -40 … -10 °C [-40 ... +14 °F] / 60 … 85 °C [140 ... 185 °F] Measuring range 10 mbar [0.15 psi] <±0.4 % + 0.3 % x TD Measuring range 30 mbar [0.45 psi] <±0.2 % + 0.15 % x TD Measuring range 100 mbar [1.5 psi] <±0.15 % + 0.2 % x TD Measuring range 500 mbar [7.5 psi] <±0.2 % + 0.06 % x TD Measuring range 3 bar [45 psi] <±0.2 % + 0.06 % x TD Measuring range 16 bar [240 psi] <±0.15 % + 0.2 % x TD Long-term stability Differential pressure ■ <0.065 % x TD (1 year) ■ <0.1 % x TD (5 years) ■ <0.15 % x TD (10 years) Static pressure ■ <±0.065 % (1 year) ■ <±0.1 % (5 years) ■ <±0.15 % (10 years) Thermal change of zero point and output span depending on the static pressure Measuring ranges 10 and 30 mbar [0.15 and 0.45 psi] To nominal pressure 40 bar [600 psi] Influence on the zero point <±0.1 % x TD Influence on the span <±0.1 % Measuring ranges 100 and 500 mbar [1.5 and 7.5 psi] To nominal pressure 160 bar [2,400 psi] Influence on the zero point <±0.1 % x TD Influence on the span <±0.1 % WIKA data sheet PE 86.22 ∙ 10/2021 Page 3 of 14 Accuracy specifications Measuring ranges 3 and 16 bar [45 and 240 psi] To nominal pressure 400 bar [5,800 psi] Influence on the zero point <±0.25 % x TD Influence on the span <±0.25 % Thermal change Change of the current output with 4 ... 20 mA signals: 0.05 % per 10 K based on 20 °C [68 °F] (maximum 0.15 % at set measuring span) in the ambient temperature range -40 … +80 °C [-40 … +176 °F] Reference conditions per IEC 61298-1 Temperature +18 ... +30 °C [64 ... 86 °F] Air pressure 860 ... 1,060 mbar [86 ... 106 kPa, 12.5 ... 15.4 psig] Air humidity 45 ... 75 % r. h. Characteristic curve determination Terminal method per IEC 61298-2 Curve characteristics Linear Reference mounting position Vertical, i.e. vertical process assembly (connections are on the side) 1) Includes non-linearity following terminal method, hysteresis and non-repeatability in accordance with IEC 62828. 2) Includes non-linearity, hysteresis, non-repeatability, thermal change of zero point and static pressure influence (Pstat = 70 bar) in the temperature range -10 … +60 °C [14 ... 140 °F]. URL = basic measuring range TD = turndown; turndown = basic measuring range : scaled measuring range Measuring range Measuring range 1) -10 mbar ... +10 mbar [-0.15 ... +0.15 psi] -30 mbar ... +30 mbar [-0.45 ... +0.45 psi] -100 mbar ... +100 mbar [-1.5 ... +1.5 psi] -500 mbar ... +500 mbar [-7.5 ... +7.5 psi] -3 bar ... +3 bar [-45 ... +45 psi] -16 bar ... +16 bar [-240 ... +240 psi] Maximum operating pressure 40 bar [600 psi] 160 bar [2,400 psi] (option: 400 bar [5,800 psi]) Lowest static pressure 2) 1 mbar abs. [0.015 psi], with application for oxygen the static pressure should not be lower than 10 mbar abs. [0.15 psi] Turndown ratio Maximum permissible turndown is unlimited (max. 20:1 is recommended) Overload, on one side 40 bar [600 psi] 160 bar [2,400 psi] (option: 400 bar [5,800 psi]) Overload, on both sides 60 bar [900 psi] 240 bar [6,300 psi] (option: 630 bar [9,100 psi])