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1/8" DIN Panel Mount pH Controller

pH Controller


Item# PHCN-37

In stock

Lead Time (If not in stock): 6 weeks
pH Controller PHCN-37 PHCN-37
  • Microprocessor-Based Versatility
  • High and Low Alarm Setpoints
  • Scalable 4 to 20 mA, 0 to 20 mA or 0 to 10 V Output
  • Compact Panel Design

PHCN-37 Model Options

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*Highlighted options are not compatible. Please select a different combination.

Supply Power
Measurement Type
Output Type

This microprocessor-based family of pH panel mounted controller is designed for a wide variety of environmental monitoring applications. The units features automatic or manual temperature compensation of pH, two 5 amp mechanical relays and a choice of a scalable 4 to 20 mA, or 0 to 20 mA control or recording output or a 0 to 10 V output. For ease of operation all calibration and parameter setpoints are selectable through the front keypad.The PHCN model can be interfaced with a variety of pH electrodes.

*The ORCN and OPCN models have been discontinued. Please contact our Electronic Engineering department if you are in need of a replacement for these series.*

pH Range: 0 to 14.00 pH (620 mV to -620mV); 0 to 100°C.
Resolution: 0.01 pH, 0.1°C
Calibration pH: 2 or 3 point
Accuracy: ±0.03 pH; ±0.5 C
Display: 4-digit, LED, 13.7 mm (0.54")
Relays: dual SPDT (form C) 5 A at 240 Vac, mechanical relay. Programmable deadband hysteresis around setpoints.
Output: 4 to 20 mA, 0 to 20 mA or 0 to 10 V (Scalable) Software selectable.
Input Impedance: >10 12 ohms
Temperature Compensation: Manual or Automatic, 0 to 100°C using Pt 100 or 1K ohm RTD
Connectors: pH: BNC; Temperature: Terminal strip
Power: 115 Vac, 230 Vac, 50/60 Hz; 12-32 Vdc
Panel Cutout: 1 /8 DIN, 45 H x 92 mm W (1.772" x 3.622")
Dimensions: 48 H x 96 W x 177 mm D (1.89" x 3.78" x 7.00")
Weight: 580 g (1.27 lb)
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Rated 5 out of 5 by from quality great quality ph control products , great service also
Date published: 2023-08-17
Rated 5 out of 5 by from PH Controler very nice Very easy to use and gives very precise results. I am very satisfied with the results!
Date published: 2020-10-26
Rated 5 out of 5 by from An excellent pH controller This is a really nice pH controller. Very reliable, easy to use, great instructions, and many other cool features. I originally bought a pH controller from Cole-Parmer which really sucked. I decided to try this one and I'm very happy with my purchase! Thanks you Omega.
Date published: 2020-06-26
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Is the PHCN-37 PH controller compatible with the PHE-7352-15 sensor?

Asked by: Anonymous
Thank you for your inquiry about the pH controller. Yes, the PHE-7352-15 pH probe is compatible with the PHCN-37 controller since it has a universal BNC connector.
Answered by: Application Engineer JC
Date published: 2021-10-18

Hi, My Name is Dee, our PH Controller is reading .8 lower than it should be. Do you have a document that shows how to re-calibrate our PH Controller Item# PHCN-37? Thank You Dee

Asked by: Dee4
We do have a full manual for the PHCN-37 pH controller that will assist you instead of the Quick Guide listed. Please email and put in the subject line: PHCN-37 manual and can send that out quickly.
Answered by: Application Engineer JC
Date published: 2019-08-22

Have an PHCN-37 PH Controller that is displaying -LMT. The pH Probe and Cable has been replaced, but still reading -LMT. The unit had been reading the pH properly since it was first installed a couple months ago. The unit is less than a year old.

Asked by: InstrENG
Thank you for your inquiry. Let’s attempt a technique that will determine the functionality of the PHCN-37 controller. If you can obtain a metal paper clip or wire and please remove the pH probe in back of the controller where it is connected via the BNC connector. With power ON to the PHCN-37 controller, place one end of the paper clip directly centered in the BNC connector of the controller and the other end, place it on the outer shell, to complete circuit. Then, see if the display on the controller reads close to ‘7.00,’ '6.99,’ or ‘6.98,’ or if it is grossly off, such as ‘4.00’ or ‘5.00,’ then it may need to be repaired. If not, then problem may be with the pH probe. Please forward your response to to follow up.
Answered by: JC ENGR
Date published: 2021-02-11

Why does my screen keep reading -lmt I know it stands for the limit it acceptable but when I take it out of the water and put it in buffer it still reads that 

Asked by: Micky
Thank you for your inquiry. It may be a symptom where the pH probe may need to be replaced.
Answered by: Application Engineer JC
Date published: 2020-12-08
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Save Configuration