Condition Sensing Switches and Controls
Flow Switches
Bulletin 839E Solid-State Flow Switches
Allen-Bradley 839E flow switches are solid-state condition sensing switches that are microprocessor based and designed with no moving parts, providing a longer service life and reducing downtime. Their rugged, corrosion-resistant 316 stainless steel construction offers an IP66 enclosure rating and allows these compact new condition sensors to withstand harsh industrial conditions, and the laser-etched label is more durable than the standard adhesive labels commonly found on similar products.
Switches are available in PNP switching output or analog output versions. The PNP switching output version features dual independently programmable PNP outputs, which can be set for either normally open or normally closed operation. The analog output version features a fully programmable 4…20 mA analog output with a single independently programmable PNP output (NO or NC). Plus, the industry-leading 4-character, 14-segment digital display shows condition indication and the unit of measure selected as well as detailed menu options during programming.
All options, including the dual setpoints, analog output range, operating mode, and display preferences are quickly and easily configured via the built-in programming buttons or through optional Windows™-based configuration software that significantly reduces set-up time, especially for installations requiring a large number of switches.
Applications and Industries
Allen-Bradley solid-state sensing devices are designed to produce high-quality results in a variety of rugged environments. The flexibility of switch configuration and mounting options make the 839E suitable for a wide range of applications including:- Harsh Chemical Wash-Down — 316L stainless steel construction, laser-etched markings and IP66 rating make these switches well-suited for food, beverage, and other applications requiring equipment wash-down.
- Water/Wastewater — Monitor cooling water circulation systems of pumps, turbines, compressors and heat exchangers.
- Pump Protection — Monitor pump functionality and lubrication systems, leak monitoring in process lines. Monitor coolant flow.
- Beverage — Filter monitoring and flow/no-flow in process lines.
- Discrete Batch — Monitor process flows.
- OEM Machine Builders / Large End Users — Easy and fast programming with ReadWin 2000 configuration kit drastically reduces switch setup time.
Features
- Dual independently programmable PNP outputs (NO or NC), or a 4...20mA analog output with a single independently programmable PNP output (NO or NC)
- Easy-to-read 4-character, 14-segment digital display
- Rugged, corrosion-resistant 316L stainless steel housing and durable laser-etched markings
- Selectable units of measure
- Easy-to-use software configuration tool
- IP66 enclosure rating
- Flow rates of liquid media (calorimetric measuring principle) in the range from 0.03 to 3 m/s (0.1 to 9.84 ft/s)
- Temperature (RTD), optional for second switch output -20 to 85°C (-4 to 185°F)
Benefits
- Microprocessor based with no moving parts — longer life, higher degree of accuracy and less downtime
- Unique housing design and invertible display allow sensor to be rotated for ease of wiring and optimal viewing of LCD display
- LCD display along with LEDs provide easy-to-read status indication
- Simple and quick setup using on-board buttons or optional configuration software