Digital PH/ORP Meter For Water Testing

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Model: RDDLZ-PHM-PH160
Weight: 1.00
SKU: RDDLZ-PHM-PH160

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Digital pH/ORP meter is an industrial pH/ORP meter for water/food pH value or ORP value testing and monitoring.

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:

2.4 inch LCD display
Good anti-interference performance
Manual/automatic temperature compensation
User settings: Language, buzzer, LCD backlight, password, pH/ORP electrode, manual/automatic temperature compensation, pH/ORP calibration, pH/ORP/temperature modification, pH/ORP high/low alarm, output signal 4-20mA and RS485, etc.
Internal industrial watchdog insures pH meter doesn't crash.

Specification:

Model	RDDLZ-PHCR-PH160
Weight	1kg
Dimension	9696100mm (HWD) with hole size 92*92mm
Measuring range	pH: 0~14pH, ORP: -1000~1000mV (-2000~2000mV can be customizable)
Accuracy	±0.02pH, ±1mV
Resolution	±0.01pH, ±1mV
Stability	≤0.02pH/24h, ≤3mV/24h
Input impedance	≥10^12Ω
Temperature range	0~100℃ (NTC 10K, accuracy: ±0.5℃)
Temperature compensation	0~100℃ manual/automatic
Output signal	Isolated 4-20mA signal (error: ±0.2%, under maximum loop resistance 750Ω)
Communication function	RS485 with standard MODBUS-RTU (Now RS485 software is free.)
Power supply	AC 220V±10%, 50Hz/60Hz DC 24V
Alarm relay	2 alarm relays: AC 250V/3A Function: high alarm, low alarm

The pH meter and pH/ORP electrode selection:

pH meter	pH/ORP electrode	Industry	Temperature range	Advantage
RDDLZ-PHCR-PH160	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	-5℃-130℃ (23-266℉)	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	-5℃-130℃ (23-266℉)	Its linearity and accuracy are higher than all above electrodes.

The pH/ORP meter diagram of ports definition:

INPUT: Measuring terminal of the electrode
REF: Reference terminal of the electrode
NC: Undefined
TEMP2: Temperature compensation terminal 2
TEMP1: Temperature compensation terminal 1
RS485 (A+): RS485 communication interface A+
RS485 (B-): RS485 communication interface B-
4-20mA (+): 4-20mA output terminal +
4-20mA (-): 4-20mA output terminal -
AC 220V (L) or DC 24V (-): AC 220V liver wire or DC 24V negative
AC 220V (N) or DC 24V (+): AC 220V liver wire or DC 24V positive
LO: Normally-open relay for low alarm
HI: Normally-closed relay for high alarm

Communication:
RS485 communication data and register address as follows:

Address	Data type	Function code	Explanation	Access right
0x0000	unsigned short	0x03	pH value (default in two decimals)	Read only
0x0001	unsigned short	0x03	Temperature value (default in one decimals)	Read only
0x0002	short	0x03	ORP value (signed integer)	Read only

Tips: Why should the pH meter be recalibrated?
After the calibration is completed, the frequently used pH meter does not need to be calibrated again within 48 hours. In case of any of the following situations, the meter needs to be recalibrated:

There's a huge difference between solution temperature and calibration temperature.
The electrode has been exposed in the air for too long, such as more than half an hour.
Position or slope adjuster is moved by mistake.
Peracid solution (pH＜2) or overbasic solution (pH＞12) is measured.
The electrode is replaced.
pH value of the measured solution is not in the middle of the calibrated value for two points while it's far from 7pH.

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