Technical Information Silicon differential pressure sensorApplication The differential pressure sensors USD50B with piezoresistive sensor and welded metal diaphragm are typically used in the process and environmental industry. Applications are level, volume or mass measurement in liquids, differential pressure monitoring, e.g. of filters and pumps as well as flow measurement (volume or mass flow). Your benefits ■ Measuring ranges from 100 mbar (1.5 psi) to 40 bar (600 psi) ■ Bridge output signal (mV) ■ High accuracy, repeatability and long-term stability ■ High overload resistance: - Up to 240 bar (3600 psi) on both sides, 630 bar (9450 psi) as an option ■ 316 L (stainless steel) version ■ Optional choice of diaphragm materials and filling oils People for Process Automation

Table of contents About this document . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 Document function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Symbols used . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Function and system design . . . . . . . . . . . . . . . . . . . . . .4 Measuring principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 Measured variable . . . . . . . . . . . . . . . . . . . . ....

About this document Document function This document contains all the technical data for the device and provides an overview of the device versions that can be ordered. Symbols used Safety symbols

Function and system design Measuring principle Metallic process diaphragm Measuring element Overload diaphragm Filling oil Process diaphragm The metallic process diaphragms (4) are deflected on both sides by the applied pressures p1 and p2. A filling oil (3) transfers the pressure to a resistance measuring bridge (semiconductor technology). The differential pressure-dependent change in the bridge output voltage is put out.

Input Measured variable Differential pressure Measuring range 2) For one-sided pressurization of the negative side, the MWP is 100 bar (1500 psi). ^WARNING ► The measuring device must be operated only within the specified limits! ► The specified values are only achieved in the reference installation B 8). ► The maximum pressure for the sensor depends on the lowest-rated element with regard to pressure. ► The sensors have been designed for high pressure levels with load changes. For very frequent load changes up to the nominal pressure 0 to 420 bar (0 to 6092 psi), check the zero point regularly....

Electrical connection Wiring diagram 1 Positive current supply (red) 2 Positive output signal (green) 3 Negative output signal (blue) 4 Negative current supply (black) 5 Isolated potential housing

Output Uncompensated bridge output signal with cable connection. Specifications valid at 0.5 mA supply current. Dynamic behavior Warm-up period

Reference operating conditions Ambient temperature TA = constant, in the range +22 to +28 °C (+72 to +82 °F) Humidity j = constant, in the range: 5 to 80 % rH ± 5 % Ambient pressure pU = constant, in the range: 860 to 1 060 mbar (12.47 to 15.37 psi) Position of measuring cell: horizontal ±1° Measuring span based on zero point Sensor characteristics 1) Verified by measurements at temperature steps T1(30 °C (86 °F)) ^ T2 (85 °C (185 °F)) ^ T3(30°C (86°F)) ^ T4(-40 °C (-40 °F)) ^ T5(30°C (86°F)) 2) Typical values, maximum 100 % higher values possible Static pressure influence The "static pressure...

Process temperature range -40 to +85 °C (-40 to 185 °F) Devices with inert oil: Minimum process and ambient temperature -20 °C (-4 °F) Process pressure range Pressure data ► MWP (Maximum Working Pressure): This value refers to a reference temperature of +20 °C (68 °F) and may be applied to the sensor for an unlimited time. Note the pressure-temperature dependence of the MWP. For pressure values permitted at higher temperatures, please refer to EN 1092-1: 2001 Tab. 18, ASME B 16.5a - 1998 Tab. 2-2.2 F316, ASME B 16.5a - 1998 Tab. 2.3.8 N10276, JIS B 2220. ► OPL (Over Pressure Limit): The test...

Ambient temperature range -40 to +85 °C (-40 to 185 °F) Devices with inert oil: Minimum process and ambient temperature -20 °C (-4 °F) Storage temperature range -40 to +85 °C (-40 to +185 °F) Climate class

Materials Materials in contact with process ■ Process diaphragm: stainless steel AISI 316L (1.4435) ■ Base body: stainless steel AISI 316L (1.4404) Materials not in contact with process Filling fluid: - (not suitable for temperatures below -20 °C (-4 °F)) - For oxygen applications: see chapter 'Process" (^ B 9).

Certificates and approvals RoHS The measuring system complies with the substance restrictions of the Restriction on Hazardous Substances Directive 2011/65/EU. Other standards and guidelines The applicable European guidelines and standards can be found in the relevant EU Declarations of Conformity. The following were also applied: DIN EN 60770 (IEC 60770): Transmitters for use in industrial process control systems Part 1: Methods for evaluating the performance of transmitters for control and regulation in industrial process control systems. DIN 16086: Procedure for writing specifications in data...

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