pH sensor for remote water quality measurements.


  • Fully encapsulated electronics
  • 4-20 mA output
  • Marine grade cable with strain relief
  • Stainless steel housing
  • Replaceable pH sensor element

pH Sensors Product Description

Global Water’s pH sensor is a rugged reliable water pH measuring device.  The pH sensors are mounted on 25 ft of marine grade cable, with lengths up to 500 ft available upon request.  The pH sensor output is 4-20 mA with a three wire configuration.  The pH sensor’s electronics are completely encapsulated in marine grade epoxy within a stainless steel housing (online version has 1 x 8 inch PVC pipe nipple, threaded both ends with cap).  The pH sensors also use removable shields and replaceable pH sensor elements for easy maintenance.

Global Water’s GL500 pH Recorder adds recording capabilities to the pH sensors.  The GL500 pH Recorder connects to the pH sensor’s 4-20mA output to record data.  In addition, Global Water offers the PC320 pH Controller to use the pH sensor’s output to control pumps or alarms.

pH Sensors Specifications

Output: 4-20 mA
Range: 0-14 pH
Accuracy: 2% of full scale
Maximum Pressure: 40 psi
Operating Voltage: 10-30 VDC
Current Draw: 5.5 mA plus sensor output
Warm Up Time: 3 seconds minimum
Operating Temperature: 23 to +131°F (-5 to +55°C)
Size of Probe:
Standard: 1-1/4″ Diameter x 10″ L (3.2 cm dia. x 25.4 cm long)
Online: 2″ Diameter x 12″ L (5 cm dia. x 30.5 cm long)
Weight: Standard and Online 1 lb. (454 g)

pH Sensors Options

WQ201 pH Sensor (PN# DB0000)
Includes 25 ft of cable.

WQ201 pH Sensor (PN# DB0000)
Includes 25 ft of cable.

WQEXC Extra Cable (PN# DH0000)
Standard pH sensors include 25 ft of cable, but can be purchased with up to 500 ft of cable.

pH Sensor Electrode (PN# 00-449)
pH electrodes should be replaced every six months and calibration should be done after every replacement.


pH 4.01 Buffer, 250 ml bottle (PN# 108800)

pH 7.00 Buffer, 250 ml bottle (PN# 108802)

pH 10.00 Buffer, 250 ml bottle (PN# 108804)

Calibration and maintenance set (PN# 108823)
Includes 3 bottles with 250 ml each pH 4.01/ 7.00/ 10.00, and 1 bottle of 250 ml KCl solution 3 mol/l.


pH10A Handheld pH Meter

pH100CCA Handheld pH Meter Kit
Includes handheld pH meter, cable with attached pH/temperature probe, and hard sided case.

PHT-810 pH Tester

EC500 Handheld Waterproof pH/Conductivity Tester
Includes electrode, protective sensor cap, sample cup with cap, four 1.5V SR44W batteries, and a 48 inch (1.2m) neckstrap.

EC510 Handheld Waterproof pH/Conductivity Tester Kit
Includes an EC500 portable conductivity meter with sensor, 84uS, 1413uS, 12880uS calibration standards, pH buffer pouches (1 each of 4, 7, 10pH plus rinse solution), weighted base, protective sensor cap, 3 sample cups, four 1.5V SR44W batteries, carrying case, and a 48 inch (1.2m) neckstrap

2AA112 pH 3110 Portable Field pH meter w/case & accessories

Lab 850 Benchtop pH meter

ProLab 1000 Bench top pH meter

ProLab 3000 Laboratory pH meter

inoLab® 7110 wastewater pH meter

WQ Water Quality Sensors

WQMS Water Quality Monitoring System
The standard unit includes a datalogger, temperature sensor, pH sensor, conductivity sensor (with a 0-5000µS range unless otherwise specified), and DO sensor.

WQL-pH pH Datalogger
Included: pH datalogger, PC-program WQL-Log, USB cable, Li battery, shackle, and hex wrench.

GL500 pH Recorder
pH recorder for sensor datalogging.  Includes Global Logger Software.  With weather proof enclosure and 12V battery.

PC320 pH Controller

WQS pH Sampling System
NOTE: pH sensor not included.

EZ100 pH Sensor Display
LCD readout display for both portable use and permanent installations.