ROC pH/ORP-5500 Series

Questions and Answers

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scottwallerAug 4, 2025
Why is the ROC Controller display unstable?
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  ericawangAug 5, 2025
  If your ROC Controller displays an unstable image, it could be due to several reasons. First, check the sensor wire connection based on the instruction manuals. Another potential cause is air bubbles in the pipeline; in this case, select a proper measurement point or change the pipeline. Unstable water quality can also lead to display issues, so stabilizing the water quality might help. Finally, a loose connection could be the culprit, so ensure the connector is securely connected.
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Elizabeth ArroyoAug 12, 2025
What to do if my ROC pH/ORP-5500 Controller shows a big deviation?
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  Jay MooreAug 12, 2025
  If your ROC Controller shows a large deviation, it could be due to a sensor fault. Try taking the sensor out of the pipeline to calibrate it. Alternatively, the cable might be damaged, requiring you to replace the sensor if calibration doesn't work. Incorrect installation can also cause deviations, so find the correct measurement point and use the flow device. Lastly, a setting problem might be the issue, so reset the parameter of the instrument.
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nicole04Aug 20, 2025
How to troubleshoot no display on ROC pH/ORP-5500 when powered on?
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  Ricky ClineAug 20, 2025
  If your ROC Controller isn't displaying anything when powered on, it could be due to a bad power supply connection. Check to see if there is 24V voltage between power terminals 24VA and 24VB. If the power supply is not the issue, the instrument may be faulty, and you should have it checked by professional technicians.
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Tracey BrownAug 27, 2025
What to do if there is a difference at transmitting data on ROC Controller?
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  John KellyAug 27, 2025
  If you notice a difference when transmitting data with your ROC Controller, it could be because the loop resistance is too large or the connection mode is incorrect. Try replacing the cable to reduce the loop resistance and check that the connection is correct. Another potential cause is an unusual power supply; ensure it's powered by the standard. Finally, a wrong transfer volume could be the issue, so reset the transferred volume.

Summary

Installation

Installation of Instrument

Electrical Connection

Details how to connect power and signal lines, emphasizing interference avoidance.

Diagram of 4-20 mA output

Relay Control Connection

Control Mode

Outline dimension and installation of the sensor

Settings

Measurement Mode

Setting Mode

Guides users on how to adjust parameters like function selection, alarm limits, and temperature compensation.

Sensor Calibration

Details the process for calibrating pH/ORP sensors using buffer solutions or offline methods.

Maintenance

Sensor Maintenance

Provides instructions for cleaning, storing, and maintaining the pH/ORP sensor.

Usage of Sensors

Troubleshooting

Instrument and probe fault common trouble shooting

Lists common problems, their causes, and solutions for the instrument and probe.

ROC pH/ORP-5500 Series Specifications

General

Measurement Range pH	0 to 14 pH
Accuracy pH	±0.01 pH
Resolution pH	0.01 pH
Resolution ORP	1 mV
Enclosure Rating	IP65
Storage Temperature	-20 to 70 °C
Relative Humidity	0 to 95% non-condensing
Model	ROC pH/ORP-5500 Series
Measurement Range ORP	-2000 to +2000 mV
Temperature Compensation	Automatic or Manual
Display	LCD
Outputs	4-20 mA, RS-485
Power Supply	100-240 VAC, 50/60 Hz

ROC pH/ORP-5500 Series - User Manual

Table of Contents