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Metering pumps inject a chemical at a set, repeatable rate. The drive defines the family: solenoid, peristaltic, electronically driven (including stepper-motor), and motor-driven pumps. Within a family you choose by maximum flow and discharge pressure, wetted materials for your chemical, and control signal: manual, pulse, or 4–20 mA.
Controllers, sensors, and the instruments around them. Controllers hold a measured value such as pH, ORP, conductivity, level, or flow at a setpoint; probes and sensors feed them; monitors and transmitters display and pass on readings; handheld meters do spot checks; adaptors and converters tie the signals together. Start from what you need to measure.
A chemical feed system mounts one to three metering pumps with back pressure and relief valves, gauge, and calibration column on a skid or wall panel, already plumbed. Choose by pump count, mounting, flow and pressure, and wetted materials.
Back pressure valves hold pressure on a pump discharge so it meters accurately without siphoning; relief valves open on overpressure and send chemical back to the tank; reducing and retaining valves serve plant piping. Choose by size, pressure, and material.
Flow meters measure rate and total of liquid through a pipe; flow switches just confirm it. The technology sets the group: mechanical paddlewheel, turbine, and multi-jet meters, magnetic meters for conductive liquids, variable area meters you read by eye, and ultrasonic meters. Choose by pipe size, flow range, liquid, and output signal.
Probes and sensors are the measuring end of the loop: pH, ORP, conductivity, temperature, and flow probes for water-treatment controllers, plus industrial position, process, and machine-condition sensors. Choose by parameter, pressure and temperature, mounting, and the signal your controller takes.
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