SS 4102 Modbus^® Multivariable Transmitter

Weatherford’s production optimization division presents the SS 4102 Modbus multivariable transmitter providing precise measurements of process pressure, differential pressure and temperature. As a fully digital transmitter, the product offers a built-in choice of Modbus protocol over serial and/or Ethernet communications, along with an optional proportional-integral-derivative (PID) controller and analog output. With this choice, the transmitter can be used in a wide variety of installations including low power transmitters in remote locations or as an addressed device offering control and measurement in an extended Ethernet network.

Overview

Highly Accurate and Dependable–The transmitter integrates a field proven, high-performance, multivariable sensor with Weatherford’s implementation of industry-standard Modbus. The multivariable transmitter can measure differential pressure and process temperature and pressure. The unit is capable of tolerating severe overpressure conditions with no sensor degradation or zero-shift. The transmitter has an accuracy of ±0.05% of span and long term drift stability of ±0.05% of the upper range limit (URL).

Flexible Communications–With built-in serial and 10BaseT Ethernet ports, the transmitter provides flexibility for both communications and configuration. The serial port is RS-232/485 configurable and uses native Modbus remote terminal unit (RTU) protocol. It can be used with radios, local displays or in communication with other serial devices. The Ethernet port supports four Modbus protocols, two simultaneous connections and extended addressing. In addition, the Ethernet port supports a friendly IP list that enhances security through limiting IP message recognition from specific addresses or address ranges.

Superior Design–The sensor uses a unique bi-planar design that allows the transmitter to be installed vertically, while easily integrating to horizontal process connections. Tangential draining and venting keep the sensor cavity clear without the use of side drain connections, regardless of horizontal or vertical installation. An optional, integrated LCD unit provides local measurement readouts and configuration capabilities for any measurement or control variable. The unit can also be calibrated from a remote controller using RealFLO™ gas flow computer (GFC) software.

The resistance temperature detector (RTD) connections are approved as non-incendive when the unit is mounted in a Division 2 area. This allows the use of a low-cost RTD connection instead of expensive explosion-proof termination boxes.