Digital PH Meter, Online Test PH/ORP Of Water/Food

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Model: RDDLZ-PHM-PH8
Weight: 1.00
SKU: RDDLZ-PHM-PH8

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Digital pH meter is an intelligent industrial online pH controller for testing/monitoring/recording water or food pH value, ORP value and temperature value.

Application:
Digital pH/ORP meter is widely used in the continuous testing and monitoring of pH, ORP and temperature in thermal power, chemical fertilizer, metallurgy, environmental protection, pharmaceutical, biochemical, food, drinking water, etc.

Function:

4.3 inch LCD display
Good anti-interference performance
Manual/automatic temperature compensation
User settings: Buzzer, LCD backlight, password, pH/ORP electrode, manual/automatic temperature compensation, pH/ORP calibration, pH/ORP modification, pH/ORP high/low alarm, output signal 4-20mA and RS485, etc.
Data record function
Automatic cleaning function

Specification:

Model	RDDLZ-PHCR-PH8.5
Weight	1kg
Dimension	144144115mm (HWD) with hole size 138*138mm
Display	4.3 inch LCD color screen
Measuring range	pH/Antimony: -2.00 ~ +16.00pH ORP: -2000 ~ +2000mV Temperature: -10.0 ~ +130.0℃
Accuracy	pH:±0.02pH Antimony: ±0.2pH
	ORP: ±2mV
	Temperature: NTC10K: ±0.3℃ (-10~+60℃), ±2.0℃ (60~130℃) PT1000/PT100: ±0.3℃
Input impedance	≥10¹²Ω
Resolution	pH/Antimony: 0.01pH
Resolution	ORP: 1mV
Temperature range	0~100℃ (NTC 10K, accuracy: ±0.5℃)
Repeatability	0.02pH
Temperature compensation	Compensation mode: Manual/Automatic
Temperature compensation	Compensation curve: Linear, Acid, Base, Pure
Record	100 sets, recording interval can be set through configuration, the recording method is FIFO.
Output signal *	Isolated 4-20mA signal (error: ±0.2%, under maximum loop resistance 750Ω), default 1 * 4-20mA output, optional 2 * 4-20mA outputs
Communication function	RS485 with standard MODBUS-RTU (Now RS485 software is free.)
Power supply	AC: 85~265V, 50Hz/60Hz
Power supply	DC: 21.6~26.4V
Alarm relay delay	0~9999 seconds, adjustable
Protection class	IP66
Operating temperature	Temperature: 0~60℃
Operating temperature	Relative Humidity: 10~85%RH (no condensing)
Storage condition	Temperature: -15~+65℃ Relative Humidity: 5~95%RH (no condensing)
Automatic cleaning *	Manually clean, set cleaning interval

The pH meter and pH/ORP electrode selection:

pH meter	pH/ORP electrode	Industry	Temperature range	Advantage
RDDLZ-PHCR-PH8.0	Combination pH electrode	Sewage disposal	0-60℃ (32-140℉)	Combination electrode has automatic temperature compensation function, suitable for occasions with large temperature fluctuations.
	Pure water pH electrode	Drinking water	0-60℃ (32-140℉)	The pH calomel electrode can be used in strong acid or alkali.
	PTFE pH electrode	Chemical	0-60℃ (32-140℉)	The electrode shell is made of PTFE, suitable for corrosive solution (strong acid or alkali), has longer life in harsh environments.
	pH glass electrode	Sewage disposal / food	0-95℃ (32-203℉)	Direct lead, double-layer glasses.
	Desulfurization pH electrode	Desulfurization	0-60℃ (32-140℉)	Flat electrode, strong anti-pollution ability and longer life
	High temperature/sterilization pH electrode	Food	0-130℃ (32-266℉)	The electrode can withstand high temperature of 0-130℃, suitable for occasions of high temperature sterilization in pharmaceutical factories, breweries, etc.
	High pressure/accuracy pH electrode	Laboratory	0-80℃ (32-176℉)	Its linearity and accuracy are higher than all above electrodes.

Wiring diagram:

Definition of the ports:

INPUT: Measuring terminal of the pH/ORP/Antimony electrode
NC: Undefined
REF: Reference terminal of the pH/ORP/Antimony electrode
NC: Undefined
TEMPA: Temperature compensation terminal A
TEMPB: Temperature compensation terminal B
TEMPC: Temperature compensation terminal C
RS485 (A+): RS485 communication interface A+
RS485 (B-): RS485 communication interface B-
0/4-20mA (A+): A current output terminal +
0/4-20mA (A/B-): A/B current output terminal -
0/4-20mA (B+): B current output terminal +
WASH: Cleaning device relay
WASH: Cleaning device relay
REL B: Alarm relay B
REL B: Alarm relay B
REL A: Alarm relay A
REL A: Alarm relay A
POWER N: AC 220V/110V neutral wire
POWER L: AC 220V/110V live wire

Communication:
RS485 communication data and register address as follows:

Address	Access authority	Data type	Data type	Function code	Explanation
0x0001	Read only	Float	4	0x03	pH/ORP/Antimony electrode measurement value
0x0003	Read only	Float	4	0x03	Temperature measurement value

Tips: How to control the pH value to be 6-9 with a pH meter?
The pH electrode with submersible installation is submerged in the alkali pool to test the pH value. The lower limit alarm relay of the pH meter is connected to a solenoid valve (normally closed solenoid valve).
First, set the lower alarm value to be 6 for closed and 7 for open, when the pH value is below 6, the alarm relay is closed and the dosing pump works to add lye to the pool. When pH value in the pool reaches 7, the alarm relay is closed, and the dosing pump stops to add lye.
Second, set the upper alarm value to be 9 for closed and 8 for open, when the pH value is above 9, the alarm relay is closed and the dosing pump works to add acid liquor to the pool. When pH value in the pool reaches 8, the alarm relay is close and the dosing pump stops to add acid liquor.
Through the alarm return difference, pH value will be controlled between 6 and 9.

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