PID Controllers
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$786.94
Subject to factory lead times
$521.80
Subject to factory lead times
$392.87
Subject to factory lead times
$438.39
Subject to factory lead times
$406.60
Subject to factory lead times
$1,167.45
Subject to factory lead times
$375.66
Subject to factory lead times
$272.63
Subject to factory lead times
$515.42
Subject to factory lead times
$454.06
Subject to factory lead times
$368.38
Subject to factory lead times
$40.92
Subject to factory lead times
$771.83
Subject to factory lead times
$37.84
Subject to factory lead times
$423.60
Subject to factory lead times
$145.18
Subject to factory lead times
$648.68
Subject to factory lead times
$473.87
Subject to factory lead times
$412.24
Subject to factory lead times
$494.26
Subject to factory lead times
$550.82
Subject to factory lead times
$503.23
Subject to factory lead times
$474.96
Subject to factory lead times
$567.35
Subject to factory lead times
$786.94
Subject to factory lead times
- A PID controller manages a process by combining three terms based on the error (the difference between measurement and setpoint): Proportional (immediate response sized to the error), Integral (corrects for long-term offset), and Derivative (dampens overshoot by reacting to how fast the error is changing). Sum them and you get the output that drives the valve, heater, or other final element.
- Tuning sets the gain and time constants for each PID term to match the process. A well-tuned loop settles quickly with minimal overshoot and stays stable. A badly tuned loop oscillates, overshoots, or moves so slowly it can't keep up with disturbances. Default factory values almost never fit your process - tuning is mandatory.
- On/off control flips the output fully on or fully off as the process crosses setpoint. Cheap, simple, and gives you constant oscillation around setpoint. PID modulates the output continuously to hold setpoint with minimal oscillation. Fuzzy logic uses if-then rules instead of math to handle processes that are too nonlinear or poorly modeled for standard PID. On/off for non-critical, PID for everything else, fuzzy for the rare oddballs.
- Relay outputs (mechanical or solid-state) for heaters, valves, alarms. SSR drive outputs (low-current DC pulses) for driving external solid-state relays. Analog outputs (4-20 mA or 0-10 V) for modulating valves or VFDs. Most controllers have 2-4 outputs total in some combination. Match the output type to the final control element before you order.

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About NISCO Inc.
NISCO offers a wide range of pressure gauges & instruments, diaphragm seals, thermometers, valves, and flow control products to the industrial and commercial marketplaces, as well as other resellers like ourselves. We can also provide other value-added services such as gauge repair, NIST traceable calibration, diaphragm seal assembly, and valve automation. NISCO takes pride in providing extensive product knowledge, helpful customer service, and market competitive pricing to help fit whatever need you may have because it is our goal to be regarded by our customers as the best supplier of pressure, temperature, and flow control products.

