pH Controllers | McMaster-Carr

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For Testing

Conductivity

Oxidation Reduction Potential (ORP)

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For DIN Panel Cutout Size

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Panel Cutout Height

REACH

RoHS

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Switch Configuration

Switching Current

Switching Voltage

DFARS Specialty Metals

Exempt

Export Control Classification Number (ECCN)

Depth

Height

Input Voltage

Maximum Oxidation Reduction Potential (ORP)

1,999 mV

2,500 mV

Minimum Oxidation Reduction Potential (ORP)

Maximum Conductivity

Minimum Conductivity

Conductivity Resolution

Mounting Location

Conductivity Tolerance

Environment

Conductivity Range

10 Products

Multifunction Chemistry Controllers

LCD Display

LCD Display for Washdown Environments

LED Display

Sensor

The same controller can actuate equipment based on pH or oxidation reduction potential (ORP). Using two SPDT (single pole, double throw) relays, these controllers can turn pumps, valves, and other equipment on or off when a reading reaches the actuation point. They also send output signals to a PLC or other receiving device to record data and control equipment. Automatic temperature compensation standardizes readings at 77° F to prevent inaccurate results in fluctuating temperatures. These controllers are often used for water treatment, electroplating, and chemical processing.

They require a pH or ORP sensor (sold separately).

Controllers with an LED display are more visible in low-light conditions than those with an LCD display.

Controllers for washdown environments are rated IP65 for protection against low-pressure washdowns and dust.

Controllers
				pH		Oxidation Reduction Potential (ORP)											pH Sensors		ORP Sensors
No. of Control Relays	Switch Industry Designation	Mechanical Relay Switching Current @ Voltage	Analog Output Current	Range	Accuracy	Range	Accuracy	Input Voltage	Mount Type	DIN Trade Size	Ht.	Wd.	Dp.	Environmental Rating		Each		Each		Each
LCD Display
2	SPDT	5 A @ 120 V AC 2.5 A @ 240 V AC	4-20 mA	0.0 to 14.0 pH	±0.05 pH	-1,999 to 1,999 mV	±0.5%	120V AC 240V AC	Panel	1/4	3 3/4"	3 3/4"	4 3/4"	__	00000000	0000000	000000000	0000000	000000000	0000000
LCD Display—For Washdown Environment
2	SPDT	5 A @ 120 V AC 2.5 A @ 240 V AC	4-20 mA	-2.0 to 16.0 pH	±0.17 pH	-2,500 to 2,500 mV	±0.1%	120V AC 240V AC	Panel	1/4	3 3/4"	3 3/4"	6 5/8"	IP65	000000000	000000	000000000	000000	000000000	000000
LED Display
2	SPDT	5 A @ 120 V AC 2.5 A @ 240 V AC	4-20 mA	0.0 to 14.0 pH	±0.05 pH	-1,999 to 1,999 mV	±0.5%	120V AC 240V AC	Panel	1/4	3 3/4"	3 3/4"	4 3/4"	__	00000000	000000	000000000	000000	000000000	000000

Conductivity Controllers

Controller

Sensor

Turn pumps, mixers, valves, and other equipment on or off based on the conductivity of a solution. These controllers compare input from a sensor (sold separately) to a programmed actuation point and react when the reading reaches the actuation point. They’re often used in water treatment and electroplating. Automatic temperature compensation standardizes readings at 77° F to prevent inaccurate results in fluctuating temperatures.

Controllers with mechanical relay output directly turn equipment on or off with two SPDT (single pole, double throw) relays.

Controllers with analog output send 4-20mA signals to a PLC or other receiving device (not included) to record data and control equipment.

Controllers with Mechanical Relay Output

Controllers
		Conductivity												Sensors
No. of Control Relays	Switch Industry Designation	Range	Accuracy	Actuation Points	Actuation Tolerance	Input Voltage	Ht.	Wd.	Dp.	Mounting Location	DIN Trade Size		Each		Each
LCD Display
2	SPDT	0 to 2.000 µS 2.000 µS to 20.000 µS 20.000 µS to 200.000 µS 200.000 uS to 2,000.000 uS 2.000 mS to 20.000 mS	±0.5% Full Scale ±1 Digit	2	0 to 0.2 µS 0 to 2 µS 0 to 20 µS 0 to 200 µS 0 to 2 mS	100-240V AC	1 3/4"	3 3/4"	4 3/4"	Panel, Wall	1/8	00000000	0000000	000000000	0000000

Controllers with Analog Output

Controllers
	Conductivity												Sensors
Output Current	Range	Accuracy	Actuation Points	Actuation Tolerance	Input Voltage	Ht.	Wd.	Dp.	Mounting Location	DIN Trade Size		Each		Each
LCD Display
4-20mA	0 to 2.000 µS 2.000 µS to 20.000 µS 20.000 µS to 200.000 µS 200.000 uS to 2,000.000 uS 2.000 mS to 20.000 mS	±0.5% Full Scale ±1 Digit	2	0 to 0.2 µS 0 to 2 µS 0 to 20 µS 0 to 200 µS 0 to 2 mS	100-240V AC	1 3/4"	3 3/4"	4 3/4"	Panel, Wall	1/8	000000000	0000000	000000000	0000000