PH/ORP-6850

Industrial online PH/ORP controller PH/ORP-6850 is single channel PH or ORP controller. It can measure and control PH and ORP value of water continuously, the PH/ORP controller is applicable for municipal waste water treatment, chemistry, printing and dyeing, paper, medicine, plating and environmental production etc.

Product Details

Contact Now

Product Details

I Introduction:

In accordance with the environment and characteristics of water industry, as well as the international power supply standard, considering the electricity design in special environment, the PH/ORP controller could be supplied with power 220V AC, 110V AC and safe low voltage 24V AC, 24V DC for selection.

Main Characteristics:

English language display

Measure pH or ORP, high/low limit control, current output, digital communication output (Optional)

It could be set automatic/manual temperature compensation

pH high/low limit alarm light, double relay, alarm delay could be set

Instrument mode isolated transmitting port, max circle resistance up to 750Ω

PID control to actuate and control powered variable value through 4-20 mA output (optional)

Back light of LCD could select power saving mode, timing automatic off, brightness adjust,

High performance CPU, good electromagnetic compatibility

AC input be fused.

ESD over voltage protection is available

Password management avoid non-professional person to operate

Main Technical Index

Measure range	pH(0～14 pH) ; ORP( -1200～+1200 mV)
Accuracy	+ 0.02 pH; + 1 mV
Resolution	0.01pH; 1mV（0.1mV optional）
Stability	≤ 0.02 pH/24hr ; ≤ 3 mV/24hr
pH standard solution	4.00/6.86/9.18 (standard), 4.01/7.00/10.01(optional)
Display	128 * 64 dot matrix LCD
Temp. compensation	0–120 ℃, manual / automatic, PT1000RTD
Signal output	One isolated 4-20mA signal output, max circle resistance 750Ω
Alarm output	high and low limit alarm contact （3A/250 V AC）, normal open contact relay
Power supply	AC220V ±10%, 50/60HzR, AC110V ±10%, 50/60Hz£, DC24V, 0.5A,£,
Power consumption	≤3W
Working environment	（1）temperature 0～60 ℃ （2）humidity≤95%RH
Outline dimension	96×96×127mm(high×width×depth)
Hole size	93×93mm(height×width)

Outline dimensions and fixed Installation

Insert the controller from the front panel, install the fix clamp

(left and right), tighten with the clamp.

Chart 1 Outline dimensions and fixed installation

Wire Connection

PH/ORP-6850

Chart 2 Rear terminals

Connection Instruction

Note: The jumper can’t remove

1．GND : REF（Black）

2．INPUT+：PH probe signal input port (Transparent)

3．INPUT-：NC

4．GND：TEMP (White)

5．TEMP：TEMP(Green)

6．-V：NC

7． I 1+: 4-20mA output + (PH)

8． I 1- : 4-20mA output - (PH)

9． A +: RS485 +

10. B+ : RS485-

11.H1: High limit relay normal open contact

12.L1: Low limit relay normal open contact

13.COM1: High/Low limit relay common port

14.H2: undefined

15.L2: undefined

16.COM2:undefined

17.N: 220V Power connection

18.GND: Ground wire

19.L: 220V Power connection

Probe Installation

Installation method and Attention-matter

PH/ORP-6850

Chart 3（Several common method of installation）

In order to make sure the probe measure the real value on the pipe, bubbles should be avoided ,otherwise the value will be not accurate, please install according to the following chart:

PH/ORP-6850

Chart 4（attention matters of pipe installation）

Note:

（1）The probe bypass pipe of the main pipe, valve should be installed in front of it to control the water flow speed, flow should be relatively slow, generally there are steady water flow out of the outlet port is ok. The probe should be installed vertically and should be insert into the active water flow, outlet port should be higher than inlet port which could make sure the probe is in the water solution absolutely.

（2）The probe should be calibrated before installation.

（3）The measure signal is weak electric signal, its cable should be contributed separately, it is not allowed to contribute together in same cable or terminal with other power line, control line etc, which is to avoid interrupt or break the measure unit.

（4）If the measure cable should be lengthen, please contact with the supplier or indicated before place order (generally not longer than 10m)

Correct setting

Soft key function

Soft key	Key function	Function description
	Menu Key	Enter main menu
	Return key	Exit or return to the upper interface
	Right shift key	Select the digit circularly, Select sub-menu, change the digit value
	Down shift key	Select sub-menu Change the digit value
	Confirm key	Confirm selected sub-menu Confirm selected value

Main Interface:

PH/ORP-6850

Note: Under main interface through press “ PH/ORP-6850 ”to shift to browsing interface，no need to enter 'Menu Option' interface, it could browse setting value.

Browsing interface

PH/ORP-6850

Note: Browsing interface through press“ PH/ORP-6850 ”could check

parameter state in turn, through press “ PH/ORP-6850 ”return to main interface.

Main Menu Interface

PH/ORP-6850

Under main interface, press “ PH/ORP-6850 ” key to enter user login interface, after input password “ 0000 ” to press “ ”to enter “ Menu Option ” interface, this interface menu instruction as follow:

No.	Menu Name	Menu content instruction
1.	Parameter	Set probe type and compensation
2.	Relay & Alarm	Set pH or ORP High/ Low set point and Relay delay
3.	4-20mA Output	Set pH or ORP transmission capacity start range transferring
4.	PID control	To actuate and control powered variable value through 4-20 mA output (Optional)
5.	Modbus RS485	Set communication baud speed and address
6.	Backlight option	Set back light normal ON, delay off and dimming
7.	Factory reset	Recovery the instrument parameters to factory setting
8.	Calibrate	This menu only open when select pH probe
9.	Password change	Reset login password

Parameter Interface

PH/ORP-6850

Note: press “ PH/ORP-6850 ” or “ ” to select “ Probe type ” or “ Temperature compensation” parameter setting，press “ ” to enter.

Relay & Alarm Interface

PH/ORP-6850

Note: press “ PH/ORP-6850 ” or “ ” select “ High Set Point ” , “ Low Set Point ” or “ Relay delay ” parameter interface，press “ ” to enter.

4-20mA output Interface

Note: press“ PH/ORP-6850 ” or “ ” input parameter value，press“ ”to save.

PID Control Interface

Note: Press “ PH/ORP-6850 ” or “ ” to select and enter into“PID ON/OFF”,“Output Port” and “PID Parameter”, press “ ”to save.

Modbus RS485 Interface

PH/ORP-6850

Note: Press “ PH/ORP-6850 ” or “ ” to select, press “ ”to save.

Back light option

Note: Press “ PH/ORP-6850 ” or “ ” to select and enter into “Delay off ”, “ Normal on” or “ Dimming ”, if select “Delay off”, then need to input '“Set Time”, if select “ Dimming ”, then need to input “ Brightness ”, press“ ”to save.

Factory Reset Interface

PH/ORP-6850

Note: Press “ PH/ORP-6850 ” or “ ” to select “ Yes ” or “ NO ”, press“ ” to save.

Factory default parameter

Menu name	Setting range	Factory parameter
Probe type	PH/ORP probe	PH probe
Temp. comp	Auto/manual	manual
Manual temp.comp value	0 ～ 120 ℃	25 ℃
High alarm close value	pH: 0.00 ～14.00	pH: 13.00 pH
High alarm close value	ORP：- 1200 ～ + 1200 mV	ORP：+ 1200 mV
High alarm open value	pH: 0.00 ～ 14.00	pH: 12.00 pH
High alarm open value	ORP：- 1200 ～ + 1200 mV	ORP：+ 1100 mV
Low alarm close value	pH: 0.00 ～14.00	pH: 2.00 pH
Low alarm close value	ORP：- 1200 ～ + 1200 mV	ORP：- 1200 mV
Low alarm open value	pH: 0.00 ～14.00	pH: 3.00 pH
Low alarm open value	ORP：- 1200 ～ + 1200 mV	ORP：- 1100 mV
Relay delay time	0-99S	0
4mA value	pH: 0.00 ～ 14.00	pH: 0.00 pH
4mA value	ORP：- 1200 ～ + 1200 mV	ORP：- 1200 mV
20mA value	pH: 0.00 ～ 14.00	pH: 14.00 pH
20mA value	ORP：- 1200 ～ + 1200 mV	ORP：+1200 mV
PID Control	ON/OFF	OFF
Set Point	0-14ph	7PH
PID Value	P: 0-500	P: 0.5
	I: 0-9999	I: 300 S
	D: 0-9999	D: 10 S
Control Cycle	1-9999	0005 S
PID Direction	Forward / Reverse	Forward
User password	0 ～ 9999	0000
Backlight	Normal ON/Delay	Delay
Delay time	0 ～ 99 S	60 S

Calibration Interface

PH/ORP-6850

Note: When put probe into the solution, the controller display current measured solution PH value. This part operation refer to “ PH controller calibration“ part.

Password Change Interface

PH/ORP-6850

Note: Input new password , press“ PH/ORP-6850 ”to save.

Maintenance

1.PH part
1)Maintenance of instrument
The input terminal of instrument (insert port of probe) should be keep dry and clean, avoid dust and moisture invade.
It is not allowed to put the probe in protein solution and acidic fluoride for long time, avoid touch with silicone oil.
After long time use, if we found the slope is lower, it could be put the probe into 4% HF solution(hydro fluoride acid) 3-5 seconds, and then clean with distilled water, then dip into 0.1mol/L hydrochloric acid, that will renew the probe.
To measure more accurate, the probe should be calibrated periodically and wash with distilled water.
The instrument should be installed at a dry place or in a electric cabinet, to avoid water drop spatter or wet which will cause leakage of electricity or measure errors.

2)Calibration of instrument:
Before calibrate, check if the wire connection of instrument is correct or not, power on and wait 20mins.
Prepare three kind of standard solution:4.00pH, 6.86pH 9.18pH
Clean the probe with distilled water and dry with filter paper, put the probe into standard buffer solution 4.00PH, mix it slowly till the display value is steady.
Through the menu to enter probe calibration interface, the screen display '4.00PH calibration', in the middle it display probe output pH value, till the pH value is steady and press ' ENT ' key to operate calibration, when calibration finished successfully it will indicate success.
Repeat the upper two steps, calibrate the 6.86 and 10.01PH. After finish each step calibrate, probe should be cleaned by distilled water and dry with filter paper, then it can be put into the next solution to calibrate.

2.ORP part

1)Preparation one kind of ORP standard solution 470mV (240mV or others optional), in order to improve the measuring accuracy, the calibration solution mV value need to close to the measuring value.

Clean the probe with distilled water and dry with filter paper, put the probe into standard buffer solution 470mV (240mV or others optional) mix it slowly till the display value is steady.
Through the menu to enter probe calibration interface, the screen display '4.00PH calibration', in the middle it display probe output pH value, till the pH value is steady and press ' ENT ' key to operate calibration, when calibration finished successfully it will indicate success.

2)ORP probe checking:
Not like pH probe need be calibrated by standard solution, the ORP probe need to use standard solution to check, the most important is to check if the probe is workable or not.
Clean the probe with clear water and dry it with soft towel.
Put the ORP probe into the mV standard solution which is prepared. wait till the reading is steady.
Watch the display value is close to mV standard solution or not, if the errors is within range ±35mV, the electrode could be used otherwise it need to be replaced.

4-20mA current output formula

1.PH Current output formula:
Factory setting define output current value is :0 pH is corresponding value of 4 mA; 14 pH is corresponding value of 20 mA.
I = ( D - 4 mA corresponding value）× ( 16 / (20 mA corresponding value- 4 mA corresponding value) ) + 4.00
I = ( D - 0 ）× ( 16 / 14 ) + 4.00
Note: I is output current value 4 mA≤I≤20 mA
D is pH value displayed by the instrument 0.00pH≤D≤14.00pH

2. Formula of ORP current output:
Factory setting define the output current is :-2000mV is corresponding
value of 4 mA; +2000mV is corresponding value of 20 mA.
I = ( D - 4 mA corresponding value ）× ( 16 / (20 mA corresponding value - 4 mA corresponding value) ) + 4.00
I = ( D – (-2000) ）× ( 16 / (+2000 – (-2000)) ) + 4.00
I = ( D + 2000 ）× ( 16 / 4000) ) + 4.00
Note:I is output current value 4 mA≤I≤20 mA
D is ORP value displayed by the instrument -2000mV≤D≤+2000mV

Fault Judgments and Trouble Clearing

(1)No display of the controller?
Answer: the power is not well connected or blown fuse. Check the power supply line and fuse.
(2)Value can be displayed but not stable ?
Answer: Probe cable is wet or ceramic of probe is polluted. Check probe cable, clean ceramic core(0.1mHCL).
(3)Solution PH4.00 and PH6.86can not be adjusted ?
Answer: Outside of probe is polluted, probe cable is wet, probe is broken or there is cracks, ceramic core of probe is blocked. Clear probe (0.1mHCL), check the probe cable, replace probe, clean ceramic core (0.1mHCL).

(4)Numbers response slow ?
Answer: thin film of probe or ceramic core is polluted. Clean the whole probe.
(5)The actual pH value change a lot but the instrument display pH value change very small?
Answer: ceramic core of probe is blocked, probe fall off/perish, slow response. Clean probe (0.1mHCL), use recovery solution.
(6)Display value of instrument not change ?
Answer: Probe broken, probe cable short circuit. replace probe, check probe cable.
(7)Relay not active or pH value not change after dosing chemicals ?
Answer: Relay broken; wrong setting of the instrument and chemical solution is not enough. Contact supplier to replace relay, change settings, add chemical solution.

Complete Instrument

PH Controller	1pc
PH probe	1pc
Fixed clamp	1pair
Operation manual	1pc
Calibration solution	1set

Get in Touch

If you are interested in our products, you can choose to leave your information here, and we will be in touch with you shortly.

FAQS

Frequently Asked Questions (FAQ) About PH/ORP-6850

Related News

Apr.16,2026

Guide to Choosing the Right RO Controller for Water Purification

Maintaining a high-performance reverse osmosis system requires more than just quality membranes; it demands precise regulation. An ro controller serves as the brain of the entire operation, monitoring critical parameters such as conductivity, temperature, and flow rates to ensure the output water meets stringent purity standards. Without an efficient controller, systems are prone to membrane fouling, inefficient energy use, and inconsistent water quality. In this comprehensive guide, we will explore how these devices optimize water treatment processes and how to select the best model for your specific industrial or commercial needs.

Apr.09,2026

Guide to Water Purity Using RO with TDS Controller Systems

Achieving the perfect balance of mineral content and purity in drinking water is a challenge for many households and industrial facilities. A ro with tds controller offers a sophisticated solution by combining the rigorous filtration of Reverse Osmosis (RO) with the precision of a Total Dissolved Solids (TDS) adjustment system. While standard RO systems remove almost everything, including beneficial minerals, a TDS controller allows users to re-mineralize the water to a desired level. This ensures that the water is not only safe and pure but also tastes better and provides essential nutrients.

Apr.07,2026

Understanding and Optimizing Reverse Osmosis Systems with a Controller

In the world of water purification, reverse osmosis (RO) systems are a cornerstone for producing high-quality water for various applications, from drinking water to industrial processes. However, an RO system is only as effective as its control system. This is where the reverse osmosis controller comes into play. This critical component manages and optimizes the RO process, ensuring efficient operation, water quality, and system longevity.

Apr.04,2026

Understanding the Vital Role of an RO System Controller for Optimal Performance

Reverse Osmosis (RO) systems are critical for purifying water across various industries, from residential applications to large-scale industrial processes. At the heart of a well-functioning RO system lies the RO system controller. This intelligent device monitors and regulates all key parameters of the RO process, ensuring optimal performance, efficiency, and water quality. This article delves into the functionalities, benefits, and selection criteria for choosing the right RO system controller, particularly focusing on those offered by Watequipments. Understanding its role is crucial for maximizing the lifespan and effectiveness of your RO investment.

Mar.24,2026

Smart Water Treatment Solutions Using PH ORP Controller Systems

In modern water treatment and industrial fluid management, maintaining precise chemical balance is essential for safety, efficiency, and regulatory compliance.

Mar.04,2026

Comprehensive Guide to Water Depth Samplers and Their Applications

Accurate water quality monitoring is crucial in various fields, from environmental science and aquaculture to industrial wastewater management. A key tool for this is the water depth sampler. This article provides an in-depth look at water depth samplers, their applications, types, and essential considerations for choosing the right one for your needs. We'll explore the benefits of utilizing this equipment to collect reliable data for analysis and informed decision-making. Selecting the right sampler can significantly improve the precision and efficiency of your water monitoring program. A water depth sampler, also known as a depth-integrated sampler, is a device designed to collect water samples from specific depths within a body of water. Unlike simply dipping a container into the water, a depth sampler allows for collection of a representative sample across a defined depth range. This is critical because water properties (temperature, salinity, pollutants) often vary significantly with depth. The data gathered with a water depth sampler provides a more accurate assessment of water quality than surface samples alone.

Mar.03,2026

Comprehensive Guide to Horizontal Water Sampler Applications and Selection

Collecting water samples at varying depths is crucial for environmental monitoring, research, and quality control. The horizontal water sampler from Watequipment.com offers a precise and efficient solution for this task. This article provides an in-depth look at horizontal water samplers, their applications, benefits, and key considerations when choosing the right model. We will explore how these samplers contribute to accurate data collection and informed decision-making in various fields. A horizontal water sampler is a device designed to collect water samples from specific depths within a body of water – rivers, lakes, oceans, reservoirs, and even wastewater treatment plants. Unlike vertical samplers which primarily focus on depth, horizontal samplers prioritize collecting samples at a consistent depth while moving along a horizontal plane. This is essential for assessing water quality variations across a waterway or within a specific zone. They are used in applications ranging from environmental monitoring and scientific research to industrial process control and regulatory compliance.

Feb.28,2026

Comprehensive Guide to Selecting the Right Surface Water Sampler for Your Needs

Monitoring the quality of surface water is critical for environmental protection, public health, and various industrial applications. A surface water sampler is an essential tool for collecting representative samples from rivers, lakes, ponds, and other surface water sources. This article provides a detailed overview of surface water samplers, their types, applications, and key considerations for selecting the right equipment. Accurate water quality data relies on proper sample collection, and choosing the correct sampler is the first step toward achieving reliable results. Surface water samplers come in various designs, each suited to specific sampling needs. Common types include grab samplers, depth-integrating samplers, peristaltic pumps, and automatic samplers. Surface water samplers are used across a broad spectrum of applications, including environmental monitoring, wastewater discharge monitoring, drinking water source monitoring, agricultural runoff analysis, and research studies.