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Controllers
Take control of your process systems with our reliable controllers. Designed to deliver accurate monitoring, precise regulation, and dependable automation, these devices help improve system performance, reduce downtim...
Categories in Controllers (3)
Control RelaysEnsure consistent performance and reliable operation in your electrical systems with our wide selection of control relays. Designed to provide safe and accurate switching, these essential components are used in motor control, automation, HVAC systems, and industrial machinery. Our offering includes general-purpose relays, timing relays, solid-state relays, and safety relays, available in multiple coil voltages and contact configurations to match your application. Built with durable materials and trusted designs, these relays deliver dependable performance while helping to protect equipment and extend system life. Whether you’re managing simple control circuits or complex automation systems, our control relays offer the reliability, flexibility, and efficiency professionals count on. With products from leading brands, it’s easy to find the right relay for your project.
Panel Meters & DisplaysGet precise, real-time monitoring of your systems with our selection of panel meters and displays. Designed to provide clear, accurate readouts, these devices help you track and manage voltage, current, frequency, temperature, pressure, and other critical process variables with confidence. Our lineup includes analog panel meters, digital panel meters, LED and LCD displays, and multi-function meters, giving you the flexibility to match the right solution to your application. Perfect for use in industrial equipment, control panels, automation systems, and HVAC, these meters are built for reliability and long-term performance. With easy-to-read displays, durable construction, and options from trusted brands, our panel meters and displays ensure you have the visibility and control needed to keep operations safe, efficient, and compliant.
PID ControllersPID controllers deliver precise, responsive regulation of temperature, pressure, flow, and other process variables across automated systems. Explore single-loop and multi-loop models with the I/O, programming flexibility, and display features your application demands.
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The Dwyer - SSRL240DC25 is a High Reliability Solid State Relay featuring 1-Phase, 24 Vac to 280 Vac Line Voltage, 25 A, 3 Vdc to 32 Vdc O/P, DC Control Signal, and Screw Mount. Part of the SSRL Series. Sold individually.
$53.65
Should ship between 06 Mar and 13 Mar
Subject to factory lead times
The Dwyer - CH-50 is a Terminal Block for NB2 Type Connection Head featuring 4 Terminals, Ceramic Block with Nickel Plated Brass Terminals, 14 AWG, and White. Part of the CH Series. Sold individually.
Save 8%$15.37
$14.13
Should ship between 21 Nov and 28 Nov
Subject to factory lead times
The Dwyer - DRTB-RAIL-8 is a Pre-Cut DIN Rail for 8 " Sub-Panel Width featuring Perforated Steel with Electrolytic Zinc Plating. Part of the DRTB-RAIL Series. Sold individually.
Save 8%$12.36
$11.36
Should ship between 21 Nov and 28 Nov
Subject to factory lead times
The Dwyer - DR-I3P is an Isolated Signal Transmitter featuring AC/DC Supply and 0 V to 10 V/4 mA to 20 mA O/P. Sold individually.
$239.62
Should ship between 21 Nov and 28 Nov
Subject to factory lead times
The Dwyer - DP20 is a Multi-signal Panel Meter featuring Universal I/P, Temperature, Process, Power, 1/8 DIN, 3.5 Digit, Red Color LED Display, and AC/DC Supply. Part of the DP20 Series. Sold individually.
$183.69
Should ship between 05 Dec and 12 Dec
Subject to factory lead times
The Dwyer - BS10A is a Barrier Strip featuring 10 Terminals, 16 AWG to 24 AWG, and Standard. Sold individually.
$25.61
Should ship between 20 Feb and 27 Feb
Subject to factory lead times
The Dwyer - AVK-4 is a Feed-Through Terminal Block featuring DIN Rail, 30 A, 600 Vac, 26 AWG to 10 AWG, 6 mm, Gray, and 10 mm (0.39 "). Part of the AVK Series. Sold individually.
$1.69
Should ship between 21 Nov and 28 Nov
Subject to factory lead times
The Dwyer - DRTB-RAIL-3575-1 is a Slotted DIN Rail 1.4 " x 0.3 " x 3.3 ' featuring Perforated Steel with Electrolytic Zinc Plating. Part of the DRTB-RAIL Series. Sold individually.
$7.80
Should ship between 21 Nov and 28 Nov
Subject to factory lead times
The Dwyer - AVK-2.5 is a Feed-Through Terminal Block featuring DIN Rail, 20 A, 600 Vac, 26 AWG to 12 AWG, 5 mm, Gray, and 10 mm (0.39 "). Part of the AVK Series. Sold individually.
$1.47
Should ship between 21 Nov and 28 Nov
Subject to factory lead times
The Dwyer - SSRL240DC10 is a High Reliability Solid State Relay featuring 1-Phase, 24 Vac to 280 Vac Line Voltage, 10 A, 3 Vdc to 32 Vdc O/P, DC Control Signal, and Screw Mount. Part of the SSRL Series. Sold individually.
$46.08
Should ship between 06 Mar and 13 Mar
Subject to factory lead times
The Dwyer - OM-92 is a Temperature & Humidity Data Logger featuring Portable, Temperature/Humidity, 2 Measurements, Internal, 65k Max Samples, Battery, USB, and 1 s. Part of the OM-90 Series. Sold individually.
$195.31
Should ship between 05 Dec and 12 Dec
Subject to factory lead times
The Dwyer - DP8EPT is an Universal Digital Panel Meter featuring Temperature, Process, Strain, 1/8 DIN, 5.5 Digit, 9-Segment Programmable 3 Color LED Display, AC Supply, and USB. Part of the PLATINUM Series. Sold individually.
Save 8%$567.96
$521.80
Should ship between 21 Nov and 28 Nov
Subject to factory lead times
The Dwyer - PUK-3 is a Feed Through Terminal Block featuring Multi-level, 24 A, 300 Vac, 24 AWG to 12 AWG, 6 mm (0.236 "), Gray, 9 mm (0.35 "), and Three level feed through Terminal Block. Part of the PUK Series. Sold individually.
$6.17
Should ship between 21 Nov and 28 Nov
Subject to factory lead times
The Dwyer - ITHX-SD is a Temperature & Humidity Chart Recorder featuring Virtual, 2-CH, External Probe I/P, Battery, AC Power Adapter, LCD, Ethernet SD Card, and Standard 203 mm (8 ") Wand Probe. Part of the iTHX Series. Sold individually.
Save 8%$844.28
$775.65
Should ship between 21 Nov and 28 Nov
Subject to factory lead times
The Dwyer - OM-CP-RHTEMP101A is a Temperature & Humidity Data Logger featuring NOMAD, Temperature/Humidity, 2 Measurements, Internal, 500K Max Samples, Battery, USB, and 1 s. Part of the OM-CP-RHTEMP101A Series. Sold individually.
$249.46
Should ship between 02 Jan and 09 Jan
Subject to factory lead times
The Dwyer - DP8PT is an Universal Digital Panel Meter featuring Temperature, Process, Strain, 1/8 DIN, 4 Digit, 9-Segment Programmable 3 Color LED Display, and AC Supply. Part of the PLATINUM Series. Sold individually.
Save 8%$427.63
$392.87
Should ship between 21 Nov and 28 Nov
Subject to factory lead times
The Dwyer - CG-7211981 is a Locknut featuring Polyamide, Gray, and M20. Part of the CG Series. Sold individually.
$1.27
Should ship between 21 Nov and 28 Nov
Subject to factory lead times
The Dwyer - DP25B-S is a Strain Gage Panel Meter featuring 1/8 DIN, 3.5 Digit, 9-Segment Selectable Color LED Display, and AC Supply. Part of the DP25B Series. Sold individually.
Save 8%$535.94
$492.38
Should ship between 21 Nov and 28 Nov
Subject to factory lead times
The Dwyer - CTXL-TRH-W is a Chart Recorder featuring Circular, Portable/Wireless Universal, 2-CH, Temperature/RH Measurement, Battery Power with Back-Up, 1/7/32 Days Chart Time, and 2 Alarm Relays. It is rated for a temperature range of -17 °C to 49 °C. Part of the CTXL Series. Sold individually.
Save 8%$2,747.20
$2,523.89
Should ship between 13 Feb and 20 Feb
Subject to factory lead times
The Dwyer - OM-24 is a Temperature & Humidity Data Logger featuring Multi-Use PDF, Temperature/Humidity, 2 Measurements, Internal, 25K Max Samples, LCD Display, Battery, USB, 30 s, Multi-language, and EN 12830. Part of the OM-22 Series. Sold individually.
$168.25
Should ship between 16 Jan and 23 Jan
Subject to factory lead times
The Dwyer - DRSL-DC4 is a DIN Rail Signal Conditioner featuring DC Supply, ± 20 mA, ± 10 Vdc I/P, and Process I/P & O/P Class. Sold individually.
$277.91
Should ship between 30 Jan and 06 Feb
Subject to factory lead times
The Dwyer - ASK-2LD-DC is a Fuse Terminal Block with LED Blown Fuse Indicator featuring 6.3 A, 24 Vdc, 26 AWG to 8 AWG, 8 mm (0.315 "), Gray, 12 mm (0.47 "), and Fuse Size 5 mm x 20 mm & 5 x 25 mm. Part of the ASK T-Block Series. Sold individually.
$11.55
Should ship between 21 Nov and 28 Nov
Subject to factory lead times
The Dwyer - DPI8 is a Digital Panel Meter featuring Universal I/P, Temperature, Process, 1/8 DIN, 3.5 Digit, 9-Segment 3 Color LED Display, and AC Supply. Part of the DPi Series. Sold individually.
Save 8%$448.42
$411.97
Should ship between 21 Nov and 28 Nov
Subject to factory lead times
The Dwyer - DPI32 is a Digital Panel Meter featuring Universal I/P, Temperature, Process, 1/32 DIN, 3.5 Digit, 9-Segment 3 Color LED Display, and AC Supply. Part of the DPi Series. Sold individually.
Save 8%$314.27
$288.73
Should ship between 21 Nov and 28 Nov
Subject to factory lead times
The Dwyer - SSRL240DC25 is a High Reliability Solid State Relay featuring 1-Phase, 24 Vac to 280 Vac Line Voltage, 25 A, 3 Vdc to 32 Vdc O/P, DC Control Signal, and Screw Mount. Part of the SSRL Series. Sold individually.
$53.65
Should ship between 06 Mar and 13 Mar
Subject to factory lead times
The Dwyer - CH-50 is a Terminal Block for NB2 Type Connection Head featuring 4 Terminals, Ceramic Block with Nickel Plated Brass Terminals, 14 AWG, and White. Part of the CH Series. Sold individually.
Save 8%$15.37
$14.13
Should ship between 21 Nov and 28 Nov
Subject to factory lead times
The Dwyer - DRTB-RAIL-8 is a Pre-Cut DIN Rail for 8 " Sub-Panel Width featuring Perforated Steel with Electrolytic Zinc Plating. Part of the DRTB-RAIL Series. Sold individually.
Save 8%$12.36
$11.36
Should ship between 21 Nov and 28 Nov
Subject to factory lead times
The Dwyer - DR-I3P is an Isolated Signal Transmitter featuring AC/DC Supply and 0 V to 10 V/4 mA to 20 mA O/P. Sold individually.
$239.62
Should ship between 21 Nov and 28 Nov
Subject to factory lead times
The Dwyer - DP20 is a Multi-signal Panel Meter featuring Universal I/P, Temperature, Process, Power, 1/8 DIN, 3.5 Digit, Red Color LED Display, and AC/DC Supply. Part of the DP20 Series. Sold individually.
$183.69
Should ship between 05 Dec and 12 Dec
Subject to factory lead times
The Dwyer - BS10A is a Barrier Strip featuring 10 Terminals, 16 AWG to 24 AWG, and Standard. Sold individually.
$25.61
Should ship between 20 Feb and 27 Feb
Subject to factory lead times
The Dwyer - AVK-4 is a Feed-Through Terminal Block featuring DIN Rail, 30 A, 600 Vac, 26 AWG to 10 AWG, 6 mm, Gray, and 10 mm (0.39 "). Part of the AVK Series. Sold individually.
$1.69
Should ship between 21 Nov and 28 Nov
Subject to factory lead times
The Dwyer - DRTB-RAIL-3575-1 is a Slotted DIN Rail 1.4 " x 0.3 " x 3.3 ' featuring Perforated Steel with Electrolytic Zinc Plating. Part of the DRTB-RAIL Series. Sold individually.
$7.80
Should ship between 21 Nov and 28 Nov
Subject to factory lead times
The Dwyer - AVK-2.5 is a Feed-Through Terminal Block featuring DIN Rail, 20 A, 600 Vac, 26 AWG to 12 AWG, 5 mm, Gray, and 10 mm (0.39 "). Part of the AVK Series. Sold individually.
$1.47
Should ship between 21 Nov and 28 Nov
Subject to factory lead times
The Dwyer - SSRL240DC10 is a High Reliability Solid State Relay featuring 1-Phase, 24 Vac to 280 Vac Line Voltage, 10 A, 3 Vdc to 32 Vdc O/P, DC Control Signal, and Screw Mount. Part of the SSRL Series. Sold individually.
$46.08
Should ship between 06 Mar and 13 Mar
Subject to factory lead times
The Dwyer - OM-92 is a Temperature & Humidity Data Logger featuring Portable, Temperature/Humidity, 2 Measurements, Internal, 65k Max Samples, Battery, USB, and 1 s. Part of the OM-90 Series. Sold individually.
$195.31
Should ship between 05 Dec and 12 Dec
Subject to factory lead times
The Dwyer - DP8EPT is an Universal Digital Panel Meter featuring Temperature, Process, Strain, 1/8 DIN, 5.5 Digit, 9-Segment Programmable 3 Color LED Display, AC Supply, and USB. Part of the PLATINUM Series. Sold individually.
Save 8%$567.96
$521.80
Should ship between 21 Nov and 28 Nov
Subject to factory lead times
The Dwyer - PUK-3 is a Feed Through Terminal Block featuring Multi-level, 24 A, 300 Vac, 24 AWG to 12 AWG, 6 mm (0.236 "), Gray, 9 mm (0.35 "), and Three level feed through Terminal Block. Part of the PUK Series. Sold individually.
$6.17
Should ship between 21 Nov and 28 Nov
Subject to factory lead times
The Dwyer - ITHX-SD is a Temperature & Humidity Chart Recorder featuring Virtual, 2-CH, External Probe I/P, Battery, AC Power Adapter, LCD, Ethernet SD Card, and Standard 203 mm (8 ") Wand Probe. Part of the iTHX Series. Sold individually.
Save 8%$844.28
$775.65
Should ship between 21 Nov and 28 Nov
Subject to factory lead times
The Dwyer - OM-CP-RHTEMP101A is a Temperature & Humidity Data Logger featuring NOMAD, Temperature/Humidity, 2 Measurements, Internal, 500K Max Samples, Battery, USB, and 1 s. Part of the OM-CP-RHTEMP101A Series. Sold individually.
$249.46
Should ship between 02 Jan and 09 Jan
Subject to factory lead times
The Dwyer - DP8PT is an Universal Digital Panel Meter featuring Temperature, Process, Strain, 1/8 DIN, 4 Digit, 9-Segment Programmable 3 Color LED Display, and AC Supply. Part of the PLATINUM Series. Sold individually.
Save 8%$427.63
$392.87
Should ship between 21 Nov and 28 Nov
Subject to factory lead times
The Dwyer - CG-7211981 is a Locknut featuring Polyamide, Gray, and M20. Part of the CG Series. Sold individually.
$1.27
Should ship between 21 Nov and 28 Nov
Subject to factory lead times
The Dwyer - DP25B-S is a Strain Gage Panel Meter featuring 1/8 DIN, 3.5 Digit, 9-Segment Selectable Color LED Display, and AC Supply. Part of the DP25B Series. Sold individually.
Save 8%$535.94
$492.38
Should ship between 21 Nov and 28 Nov
Subject to factory lead times
The Dwyer - CTXL-TRH-W is a Chart Recorder featuring Circular, Portable/Wireless Universal, 2-CH, Temperature/RH Measurement, Battery Power with Back-Up, 1/7/32 Days Chart Time, and 2 Alarm Relays. It is rated for a temperature range of -17 °C to 49 °C. Part of the CTXL Series. Sold individually.
Save 8%$2,747.20
$2,523.89
Should ship between 13 Feb and 20 Feb
Subject to factory lead times
The Dwyer - OM-24 is a Temperature & Humidity Data Logger featuring Multi-Use PDF, Temperature/Humidity, 2 Measurements, Internal, 25K Max Samples, LCD Display, Battery, USB, 30 s, Multi-language, and EN 12830. Part of the OM-22 Series. Sold individually.
$168.25
Should ship between 16 Jan and 23 Jan
Subject to factory lead times
The Dwyer - DRSL-DC4 is a DIN Rail Signal Conditioner featuring DC Supply, ± 20 mA, ± 10 Vdc I/P, and Process I/P & O/P Class. Sold individually.
$277.91
Should ship between 30 Jan and 06 Feb
Subject to factory lead times
The Dwyer - ASK-2LD-DC is a Fuse Terminal Block with LED Blown Fuse Indicator featuring 6.3 A, 24 Vdc, 26 AWG to 8 AWG, 8 mm (0.315 "), Gray, 12 mm (0.47 "), and Fuse Size 5 mm x 20 mm & 5 x 25 mm. Part of the ASK T-Block Series. Sold individually.
$11.55
Should ship between 21 Nov and 28 Nov
Subject to factory lead times
The Dwyer - DPI8 is a Digital Panel Meter featuring Universal I/P, Temperature, Process, 1/8 DIN, 3.5 Digit, 9-Segment 3 Color LED Display, and AC Supply. Part of the DPi Series. Sold individually.
Save 8%$448.42
$411.97
Should ship between 21 Nov and 28 Nov
Subject to factory lead times
The Dwyer - DPI32 is a Digital Panel Meter featuring Universal I/P, Temperature, Process, 1/32 DIN, 3.5 Digit, 9-Segment 3 Color LED Display, and AC Supply. Part of the DPi Series. Sold individually.
Save 8%$314.27
$288.73
Should ship between 21 Nov and 28 Nov
Subject to factory lead times
FAQ
- Controllers take a measurement (pressure, temperature, flow, level, pH), compare it to a setpoint, and drive an output to bring the process to setpoint and hold it there. They're the brain between the sensor and the final control element. Standalone controllers handle single loops. PLCs and DCS handle hundreds or thousands.
- A PLC (Programmable Logic Controller) is a general-purpose industrial computer that can run any logic you program into it: sequential, PID, math, communications, motion control. A PID controller is a dedicated device that does one job (closed-loop control of a single variable). PIDs are cheap, fast to set up, and self-contained. PLCs are flexible but require programming. Use a PID for one or two loops, a PLC when you need more scale or coordination.
- Auto-tuning runs a deliberate test on the process (usually a relay or step test), watches the response, and calculates PID terms from the result. Beats hand-tuning for most loops, takes a few minutes, and gets you to a working tune. Not magic - if the process is wildly nonlinear or noisy, you still need a human to clean up after it.
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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.