Flow, pH & Conductivity Meters, Transmitters & Controllers - Georg Fischer Signet

Centro offers a wide range of flow, pH, and conductivity meters, transmitters, and controllers to meet the demands of various industrial and commercial applications. From monitoring flow rates and maintaining chemi...

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Ball Valves
Ball Valves

Centro offers a reliable selection of ball valves or flow control valves designed for smooth operation and long-lasting performance in a wide range of applications. These quarter-turn valves provide tight shutoff capabilities, making them ideal for use in fluid systems requiring low torque and minimal leakage.


Ball Valves are available in a variety of materials including brass, stainless steel, and PVC, our solutions support industrial needs. Whether you're managing water, oil, gas, or chemical flow, Centro's valve options ensure durability and precise control.


With configurations ranging from full port to reduced port and options for 1-piece, 2-piece, and 3-piece designs, we provide flexibility for everything from general plumbing to high-pressure industrial systems.


Explore our complete range of ball valves to find the right fit for your application or contact our experts for personalized guidance.


Valve Accessories
Valve Accessories

Valve accessories are additional components that enhance the functionality and performance of valves in fluid control systems. These accessories are designed to provide other features, improve safety, or simplify maintenance of the valves. Valve accessories enhance the reliability, efficiency, and safety of valve operations, making them essential for various industries such as oil and gas, chemical processing, water treatment, and power generation.

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The GF Signet 2820 Conductivity/Resistivity Electrode is a 2-electrode contacting sensor with a cell constant of 1.0 cm⁻¹, suited for general-purpose conductivity measurement in water treatment, cooling water, and process control (10 µS/cm to 200 mS/cm). Available with PVDF or PP body and NPT or DIN connection styles.

$563.62$635.00

You save 11%
Available for Purchase

Subject to factory lead times

The GF Signet 2820 Conductivity/Resistivity Electrode is a 2-electrode contacting sensor with a cell constant of 1.0 cm⁻¹, suited for general-purpose conductivity measurement in water treatment, cooling water, and process control (10 µS/cm to 200 mS/cm). Available with PVDF or PP body and NPT or DIN connection styles. This specific variant (3-2820-1C) is configured with 1m integral cable.

$664.80$749.00

You save 11%
Available for Purchase

Subject to factory lead times

The GF Signet 2820 Conductivity/Resistivity Electrode is a 2-electrode contacting sensor with a cell constant of 1.0 cm⁻¹, suited for general-purpose conductivity measurement in water treatment, cooling water, and process control (10 µS/cm to 200 mS/cm). Available with PVDF or PP body and NPT or DIN connection styles. This specific variant (3-2820-1P-025) is configured with 1-inch pipe size, 25 mm insertion/cable.

$569.83$642.00

You save 11%
Available for Purchase

Subject to factory lead times

The GF Signet 2820 Conductivity/Resistivity Electrode is a 2-electrode contacting sensor with a cell constant of 1.0 cm⁻¹, suited for general-purpose conductivity measurement in water treatment, cooling water, and process control (10 µS/cm to 200 mS/cm). Available with PVDF or PP body and NPT or DIN connection styles. This specific variant (3-2820-1P-050) is configured with 1-inch pipe size, 50 mm insertion/cable.

$655.04$738.00

You save 11%
Available for Purchase

Subject to factory lead times

The GF Signet 2820 Conductivity/Resistivity Electrode is a 2-electrode contacting sensor with a cell constant of 1.0 cm⁻¹, suited for general-purpose conductivity measurement in water treatment, cooling water, and process control (10 µS/cm to 200 mS/cm). Available with PVDF or PP body and NPT or DIN connection styles. This specific variant (3-2820-S1) is configured with socket connection, channel 1.

$1,133.44$1,277.00

You save 11%
Available for Purchase

Subject to factory lead times

The GF Signet 2820 Conductivity/Resistivity Electrode is a 2-electrode contacting sensor with a cell constant of 1.0 cm⁻¹, suited for general-purpose conductivity measurement in water treatment, cooling water, and process control (10 µS/cm to 200 mS/cm). Available with PVDF or PP body and NPT or DIN connection styles.

$1,239.95$1,397.00

You save 11%
Available for Purchase

Subject to factory lead times

The GF Signet 2820 Conductivity/Resistivity Electrode is a 2-electrode contacting sensor with a cell constant of 1.0 cm⁻¹, suited for general-purpose conductivity measurement in water treatment, cooling water, and process control (10 µS/cm to 200 mS/cm). Available with PVDF or PP body and NPT or DIN connection styles. This specific variant (3-2820-S2) is configured with socket connection, channel 2.

$1,340.25$1,510.00

You save 11%
Available for Purchase

Subject to factory lead times

The GF Signet 2820 Conductivity/Resistivity Electrode is a 2-electrode contacting sensor with a cell constant of 1.0 cm⁻¹, suited for general-purpose conductivity measurement in water treatment, cooling water, and process control (10 µS/cm to 200 mS/cm). Available with PVDF or PP body and NPT or DIN connection styles.

$1,424.57$1,605.00

You save 11%
Available for Purchase

Subject to factory lead times

The GF Signet 2820 Conductivity/Resistivity Electrode is a 2-electrode contacting sensor with a cell constant of 1.0 cm⁻¹, suited for general-purpose conductivity measurement in water treatment, cooling water, and process control (10 µS/cm to 200 mS/cm). Available with PVDF or PP body and NPT or DIN connection styles. This specific variant (3-2820-T1) is configured with threaded connection, 4-20 mA.

$1,587.00$1,788.00

You save 11%
Available for Purchase

Subject to factory lead times

The GF Signet 2820 Conductivity/Resistivity Electrode is a 2-electrode contacting sensor with a cell constant of 1.0 cm⁻¹, suited for general-purpose conductivity measurement in water treatment, cooling water, and process control (10 µS/cm to 200 mS/cm). Available with PVDF or PP body and NPT or DIN connection styles.

$1,673.98$1,886.00

You save 11%
Available for Purchase

Subject to factory lead times

The GF Signet 2820 Conductivity/Resistivity Electrode is a 2-electrode contacting sensor with a cell constant of 1.0 cm⁻¹, suited for general-purpose conductivity measurement in water treatment, cooling water, and process control (10 µS/cm to 200 mS/cm). Available with PVDF or PP body and NPT or DIN connection styles. This specific variant (3-2820-T2) is configured with threaded connection, voltage.

$1,797.35$2,025.00

You save 11%
Available for Purchase

Subject to factory lead times

The GF Signet 2820 Conductivity/Resistivity Electrode is a 2-electrode contacting sensor with a cell constant of 1.0 cm⁻¹, suited for general-purpose conductivity measurement in water treatment, cooling water, and process control (10 µS/cm to 200 mS/cm). Available with PVDF or PP body and NPT or DIN connection styles.

$1,880.79$2,119.00

You save 11%
Available for Purchase

Subject to factory lead times

The GF Signet 2820 Conductivity/Resistivity Electrode is a 2-electrode contacting sensor with a cell constant of 1.0 cm⁻¹, suited for general-purpose conductivity measurement in water treatment, cooling water, and process control (10 µS/cm to 200 mS/cm). Available with PVDF or PP body and NPT or DIN connection styles.

$317.76$358.00

You save 11%
Available for Purchase

Subject to factory lead times

The GF Signet 2820 Conductivity/Resistivity Electrode is a 2-electrode contacting sensor with a cell constant of 1.0 cm⁻¹, suited for general-purpose conductivity measurement in water treatment, cooling water, and process control (10 µS/cm to 200 mS/cm). Available with PVDF or PP body and NPT or DIN connection styles.

$89.65$101.00

You save 11%
Available for Purchase

Subject to factory lead times

The GF Signet 2820 Conductivity/Resistivity Electrode is a 2-electrode contacting sensor with a cell constant of 1.0 cm⁻¹, suited for general-purpose conductivity measurement in water treatment, cooling water, and process control (10 µS/cm to 200 mS/cm). Available with PVDF or PP body and NPT or DIN connection styles.

$317.76$358.00

You save 11%
Available for Purchase

Subject to factory lead times

The GF Signet 2821 Conductivity/Resistivity Electrode features a 10.0 cm⁻¹ cell constant for high-conductivity applications such as concentrated chemical solutions, brine, or seawater (1 mS/cm to 2 S/cm). Its robust PVDF or PP construction withstands aggressive chemicals and elevated temperatures.

$563.62$635.00

You save 11%
Available for Purchase

Subject to factory lead times

The GF Signet 2821 Conductivity/Resistivity Electrode features a 10.0 cm⁻¹ cell constant for high-conductivity applications such as concentrated chemical solutions, brine, or seawater (1 mS/cm to 2 S/cm). Its robust PVDF or PP construction withstands aggressive chemicals and elevated temperatures. This specific variant (3-2821-1C) is configured with 1m integral cable.

$664.80$749.00

You save 11%
Available for Purchase

Subject to factory lead times

The GF Signet 2821 Conductivity/Resistivity Electrode features a 10.0 cm⁻¹ cell constant for high-conductivity applications such as concentrated chemical solutions, brine, or seawater (1 mS/cm to 2 S/cm). Its robust PVDF or PP construction withstands aggressive chemicals and elevated temperatures. This specific variant (3-2821-1P-025) is configured with 1-inch pipe size, 25 mm insertion/cable.

$569.83$642.00

You save 11%
Available for Purchase

Subject to factory lead times

The GF Signet 2821 Conductivity/Resistivity Electrode features a 10.0 cm⁻¹ cell constant for high-conductivity applications such as concentrated chemical solutions, brine, or seawater (1 mS/cm to 2 S/cm). Its robust PVDF or PP construction withstands aggressive chemicals and elevated temperatures. This specific variant (3-2821-1P-050) is configured with 1-inch pipe size, 50 mm insertion/cable.

$655.04$738.00

You save 11%
Available for Purchase

Subject to factory lead times

The GF Signet 2821 Conductivity/Resistivity Electrode features a 10.0 cm⁻¹ cell constant for high-conductivity applications such as concentrated chemical solutions, brine, or seawater (1 mS/cm to 2 S/cm). Its robust PVDF or PP construction withstands aggressive chemicals and elevated temperatures. This specific variant (3-2821-1P-100) is configured with 1-inch pipe size, 100 mm insertion.

$539.65$608.00

You save 11%
Available for Purchase

Subject to factory lead times

The GF Signet 2821 Conductivity/Resistivity Electrode features a 10.0 cm⁻¹ cell constant for high-conductivity applications such as concentrated chemical solutions, brine, or seawater (1 mS/cm to 2 S/cm). Its robust PVDF or PP construction withstands aggressive chemicals and elevated temperatures. This specific variant (3-2821-3K-025) is configured with 3-electrode, PVDF body, 25 mm insertion/cable.

$1,476.94$1,664.00

You save 11%
Available for Purchase

Subject to factory lead times

The GF Signet 2821 Conductivity/Resistivity Electrode features a 10.0 cm⁻¹ cell constant for high-conductivity applications such as concentrated chemical solutions, brine, or seawater (1 mS/cm to 2 S/cm). Its robust PVDF or PP construction withstands aggressive chemicals and elevated temperatures. This specific variant (3-2821-S1) is configured with socket connection, channel 1.

$1,133.44$1,277.00

You save 11%
Available for Purchase

Subject to factory lead times

The GF Signet 2821 Conductivity/Resistivity Electrode features a 10.0 cm⁻¹ cell constant for high-conductivity applications such as concentrated chemical solutions, brine, or seawater (1 mS/cm to 2 S/cm). Its robust PVDF or PP construction withstands aggressive chemicals and elevated temperatures.

$1,239.95$1,397.00

You save 11%
Available for Purchase

Subject to factory lead times

The GF Signet 2821 Conductivity/Resistivity Electrode features a 10.0 cm⁻¹ cell constant for high-conductivity applications such as concentrated chemical solutions, brine, or seawater (1 mS/cm to 2 S/cm). Its robust PVDF or PP construction withstands aggressive chemicals and elevated temperatures. This specific variant (3-2821-S2) is configured with socket connection, channel 2.

$1,340.25$1,510.00

You save 11%
Available for Purchase

Subject to factory lead times

The GF Signet 2820 Conductivity/Resistivity Electrode is a 2-electrode contacting sensor with a cell constant of 1.0 cm⁻¹, suited for general-purpose conductivity measurement in water treatment, cooling water, and process control (10 µS/cm to 200 mS/cm). Available with PVDF or PP body and NPT or DIN connection styles.

$563.62$635.00

You save 11%
Available for Purchase

Subject to factory lead times

The GF Signet 2820 Conductivity/Resistivity Electrode is a 2-electrode contacting sensor with a cell constant of 1.0 cm⁻¹, suited for general-purpose conductivity measurement in water treatment, cooling water, and process control (10 µS/cm to 200 mS/cm). Available with PVDF or PP body and NPT or DIN connection styles. This specific variant (3-2820-1C) is configured with 1m integral cable.

$664.80$749.00

You save 11%
Available for Purchase

Subject to factory lead times

The GF Signet 2820 Conductivity/Resistivity Electrode is a 2-electrode contacting sensor with a cell constant of 1.0 cm⁻¹, suited for general-purpose conductivity measurement in water treatment, cooling water, and process control (10 µS/cm to 200 mS/cm). Available with PVDF or PP body and NPT or DIN connection styles. This specific variant (3-2820-1P-025) is configured with 1-inch pipe size, 25 mm insertion/cable.

$569.83$642.00

You save 11%
Available for Purchase

Subject to factory lead times

The GF Signet 2820 Conductivity/Resistivity Electrode is a 2-electrode contacting sensor with a cell constant of 1.0 cm⁻¹, suited for general-purpose conductivity measurement in water treatment, cooling water, and process control (10 µS/cm to 200 mS/cm). Available with PVDF or PP body and NPT or DIN connection styles. This specific variant (3-2820-1P-050) is configured with 1-inch pipe size, 50 mm insertion/cable.

$655.04$738.00

You save 11%
Available for Purchase

Subject to factory lead times

The GF Signet 2820 Conductivity/Resistivity Electrode is a 2-electrode contacting sensor with a cell constant of 1.0 cm⁻¹, suited for general-purpose conductivity measurement in water treatment, cooling water, and process control (10 µS/cm to 200 mS/cm). Available with PVDF or PP body and NPT or DIN connection styles. This specific variant (3-2820-S1) is configured with socket connection, channel 1.

$1,133.44$1,277.00

You save 11%
Available for Purchase

Subject to factory lead times

The GF Signet 2820 Conductivity/Resistivity Electrode is a 2-electrode contacting sensor with a cell constant of 1.0 cm⁻¹, suited for general-purpose conductivity measurement in water treatment, cooling water, and process control (10 µS/cm to 200 mS/cm). Available with PVDF or PP body and NPT or DIN connection styles.

$1,239.95$1,397.00

You save 11%
Available for Purchase

Subject to factory lead times

The GF Signet 2820 Conductivity/Resistivity Electrode is a 2-electrode contacting sensor with a cell constant of 1.0 cm⁻¹, suited for general-purpose conductivity measurement in water treatment, cooling water, and process control (10 µS/cm to 200 mS/cm). Available with PVDF or PP body and NPT or DIN connection styles. This specific variant (3-2820-S2) is configured with socket connection, channel 2.

$1,340.25$1,510.00

You save 11%
Available for Purchase

Subject to factory lead times

The GF Signet 2820 Conductivity/Resistivity Electrode is a 2-electrode contacting sensor with a cell constant of 1.0 cm⁻¹, suited for general-purpose conductivity measurement in water treatment, cooling water, and process control (10 µS/cm to 200 mS/cm). Available with PVDF or PP body and NPT or DIN connection styles.

$1,424.57$1,605.00

You save 11%
Available for Purchase

Subject to factory lead times

The GF Signet 2820 Conductivity/Resistivity Electrode is a 2-electrode contacting sensor with a cell constant of 1.0 cm⁻¹, suited for general-purpose conductivity measurement in water treatment, cooling water, and process control (10 µS/cm to 200 mS/cm). Available with PVDF or PP body and NPT or DIN connection styles. This specific variant (3-2820-T1) is configured with threaded connection, 4-20 mA.

$1,587.00$1,788.00

You save 11%
Available for Purchase

Subject to factory lead times

The GF Signet 2820 Conductivity/Resistivity Electrode is a 2-electrode contacting sensor with a cell constant of 1.0 cm⁻¹, suited for general-purpose conductivity measurement in water treatment, cooling water, and process control (10 µS/cm to 200 mS/cm). Available with PVDF or PP body and NPT or DIN connection styles.

$1,673.98$1,886.00

You save 11%
Available for Purchase

Subject to factory lead times

The GF Signet 2820 Conductivity/Resistivity Electrode is a 2-electrode contacting sensor with a cell constant of 1.0 cm⁻¹, suited for general-purpose conductivity measurement in water treatment, cooling water, and process control (10 µS/cm to 200 mS/cm). Available with PVDF or PP body and NPT or DIN connection styles. This specific variant (3-2820-T2) is configured with threaded connection, voltage.

$1,797.35$2,025.00

You save 11%
Available for Purchase

Subject to factory lead times

The GF Signet 2820 Conductivity/Resistivity Electrode is a 2-electrode contacting sensor with a cell constant of 1.0 cm⁻¹, suited for general-purpose conductivity measurement in water treatment, cooling water, and process control (10 µS/cm to 200 mS/cm). Available with PVDF or PP body and NPT or DIN connection styles.

$1,880.79$2,119.00

You save 11%
Available for Purchase

Subject to factory lead times

The GF Signet 2820 Conductivity/Resistivity Electrode is a 2-electrode contacting sensor with a cell constant of 1.0 cm⁻¹, suited for general-purpose conductivity measurement in water treatment, cooling water, and process control (10 µS/cm to 200 mS/cm). Available with PVDF or PP body and NPT or DIN connection styles.

$317.76$358.00

You save 11%
Available for Purchase

Subject to factory lead times

The GF Signet 2820 Conductivity/Resistivity Electrode is a 2-electrode contacting sensor with a cell constant of 1.0 cm⁻¹, suited for general-purpose conductivity measurement in water treatment, cooling water, and process control (10 µS/cm to 200 mS/cm). Available with PVDF or PP body and NPT or DIN connection styles.

$89.65$101.00

You save 11%
Available for Purchase

Subject to factory lead times

The GF Signet 2820 Conductivity/Resistivity Electrode is a 2-electrode contacting sensor with a cell constant of 1.0 cm⁻¹, suited for general-purpose conductivity measurement in water treatment, cooling water, and process control (10 µS/cm to 200 mS/cm). Available with PVDF or PP body and NPT or DIN connection styles.

$317.76$358.00

You save 11%
Available for Purchase

Subject to factory lead times

The GF Signet 2821 Conductivity/Resistivity Electrode features a 10.0 cm⁻¹ cell constant for high-conductivity applications such as concentrated chemical solutions, brine, or seawater (1 mS/cm to 2 S/cm). Its robust PVDF or PP construction withstands aggressive chemicals and elevated temperatures.

$563.62$635.00

You save 11%
Available for Purchase

Subject to factory lead times

The GF Signet 2821 Conductivity/Resistivity Electrode features a 10.0 cm⁻¹ cell constant for high-conductivity applications such as concentrated chemical solutions, brine, or seawater (1 mS/cm to 2 S/cm). Its robust PVDF or PP construction withstands aggressive chemicals and elevated temperatures. This specific variant (3-2821-1C) is configured with 1m integral cable.

$664.80$749.00

You save 11%
Available for Purchase

Subject to factory lead times

The GF Signet 2821 Conductivity/Resistivity Electrode features a 10.0 cm⁻¹ cell constant for high-conductivity applications such as concentrated chemical solutions, brine, or seawater (1 mS/cm to 2 S/cm). Its robust PVDF or PP construction withstands aggressive chemicals and elevated temperatures. This specific variant (3-2821-1P-025) is configured with 1-inch pipe size, 25 mm insertion/cable.

$569.83$642.00

You save 11%
Available for Purchase

Subject to factory lead times

The GF Signet 2821 Conductivity/Resistivity Electrode features a 10.0 cm⁻¹ cell constant for high-conductivity applications such as concentrated chemical solutions, brine, or seawater (1 mS/cm to 2 S/cm). Its robust PVDF or PP construction withstands aggressive chemicals and elevated temperatures. This specific variant (3-2821-1P-050) is configured with 1-inch pipe size, 50 mm insertion/cable.

$655.04$738.00

You save 11%
Available for Purchase

Subject to factory lead times

The GF Signet 2821 Conductivity/Resistivity Electrode features a 10.0 cm⁻¹ cell constant for high-conductivity applications such as concentrated chemical solutions, brine, or seawater (1 mS/cm to 2 S/cm). Its robust PVDF or PP construction withstands aggressive chemicals and elevated temperatures. This specific variant (3-2821-1P-100) is configured with 1-inch pipe size, 100 mm insertion.

$539.65$608.00

You save 11%
Available for Purchase

Subject to factory lead times

The GF Signet 2821 Conductivity/Resistivity Electrode features a 10.0 cm⁻¹ cell constant for high-conductivity applications such as concentrated chemical solutions, brine, or seawater (1 mS/cm to 2 S/cm). Its robust PVDF or PP construction withstands aggressive chemicals and elevated temperatures. This specific variant (3-2821-3K-025) is configured with 3-electrode, PVDF body, 25 mm insertion/cable.

$1,476.94$1,664.00

You save 11%
Available for Purchase

Subject to factory lead times

The GF Signet 2821 Conductivity/Resistivity Electrode features a 10.0 cm⁻¹ cell constant for high-conductivity applications such as concentrated chemical solutions, brine, or seawater (1 mS/cm to 2 S/cm). Its robust PVDF or PP construction withstands aggressive chemicals and elevated temperatures. This specific variant (3-2821-S1) is configured with socket connection, channel 1.

$1,133.44$1,277.00

You save 11%
Available for Purchase

Subject to factory lead times

The GF Signet 2821 Conductivity/Resistivity Electrode features a 10.0 cm⁻¹ cell constant for high-conductivity applications such as concentrated chemical solutions, brine, or seawater (1 mS/cm to 2 S/cm). Its robust PVDF or PP construction withstands aggressive chemicals and elevated temperatures.

$1,239.95$1,397.00

You save 11%
Available for Purchase

Subject to factory lead times

The GF Signet 2821 Conductivity/Resistivity Electrode features a 10.0 cm⁻¹ cell constant for high-conductivity applications such as concentrated chemical solutions, brine, or seawater (1 mS/cm to 2 S/cm). Its robust PVDF or PP construction withstands aggressive chemicals and elevated temperatures. This specific variant (3-2821-S2) is configured with socket connection, channel 2.

$1,340.25$1,510.00

You save 11%
Available for Purchase

Subject to factory lead times