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About pH Controllers
pH controllers monitor potential of hydrogen (pH) levels and initiate controller functions. They provide rapid on/off control of dosing and are used in applications such as food processing, hydroponics, water purification, and waste control. pH controllers differ in terms of control type and provide limit control, linear control, or non-linear control. Several linear control styles are available. Feed-forward or compensation devices provide direct control from a reference signal and are used in either open-loop configurations or with proportional integral derivative control (PID). Automatic reset, bias, or offset control provides proportional, integral control and is used to eliminate steady-state errors. Proportional derivative control increases the speed of response, but is noisy and may seem unstable. Proportional control produces a control signal that is proportional to the error between the reference and feedback signals. Some pH controllers include minimum and maximum limits points. Others allow adjustments to deadband or hysteresis around limit points.
pH controllers differ in terms of performance specifications, features, and discrete input/ output (I/O) options. Performance specifications include the number of inputs, number of control outputs, number of control/feedback loops, update rate or bandwidth, and accuracy. Multi-function pH controllers have multiple modes which may or may not use different inputs and outputs. Multiple linked loops are designed to improve control performance and/or stability. Analog voltages, current loops, and switch outputs are common control signal outputs. Voltages and current loops are used as sensor excitation supplies. Some pH controllers include ambient temperature compensation, self-tuning functions, programmable set points, built-in alarms, or visual indicators. Others are waterproof or washdown capable. pH controllers that include signal computation functions or filters are also available. In terms of I/O options, important considerations include number of digital inputs, number of digital outputs, total digital channels, transistor-transistor logic (TTL) capability, and high power switching.
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Engineering Web: pH Controllers
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Cole-Parmer Bench and Wall-Mount pH and ORP... Cole-Parmer Catalog > pH Control > Cole-Parmer Bench and Wall-Mount pH and ORP Controllers/Recorders |
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Dwyer Instruments Home Page 2009 Flow Switches Flowmeters Flow Indicators / Controllers Flow Transmitters Mass Flowmeters and Controllers Sight Flow Indicators Sight Flow Indicators See Dwyer Instruments Inc. Profile & Catalog |
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Programmable Logic Controller (PLCS) - Servo Control -... reference information about programmable logic controllers ( PLCS), servo control units, motor controllers and many other types of controllers. |
Part Numbers for pH Controllers
| Part # | Distributor | Manufacturer | Product Category | Description |
|---|---|---|---|---|
| PH202GUEUQ | PLC Radwell | YOKOGAWA | Not Provided | CONTROLLER PH/URP TWO WIRE TRANSMITTER |
| PH202GUE | PLC Radwell | YOKOGAWA | Not Provided | CONTROLLER PH/URP TWO WIRE TRANSMITTER |
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