Water pH Monitoring Solution Datasheet

Solution Overview

Description

The Water pH Sensor Solution integrates the RAK Sensor Hub with the JXBS-4001-pH Water pH Sensor. The probe features a pH glass electrode and an Ag/AgCl reference electrode, ensuring stable signals and high precision. This sensor offers a wide measuring range, good linearity, excellent waterproof performance, and is both easy to use and install.

With the plug-and-play feature of the Sensor Hub, the Water pH Sensor Solution comes with pre-installed components ready for easy installation and connection. The sensor provides highly accurate water pH readings, with the Sensor Hub collecting and transmitting the data via LoRaWAN or NB-IoT/CAT M1.

The Sensor Hub’s connectivity function allows for versatile data transmission to the cloud using the two most commonly used communication protocols in IoT. This versatility ensures that data is readily available for storage, visualization, and in-depth analysis, enabling informed decision-making based on comprehensive knowledge of water pH levels.

Features

• Support LoRa and NB -IoT/LTE CAT-M wireless communication modes
• Support LoRa frequency band: CN470, EU868, IN865, RU864, US915, AU915, KR920, and AS923-1/2/3/4
• Easy to install and configure
• Configurable network access with the WisToolBox mobile app
• Configurable manual and automatic water temperature compensation function
• Stable signal
• Wide measuring range
• Low power consumption
  • External DC power supply (optional)
  • Solar panel power supply (optional)
• Long transmission distance
• High Precision
• Good waterproof performances

Hardware Specifications

Sensor Hub Specifications

If you need detailed information about the Sensor Hub, including technical specifications and features, refer to the Sensor Hub Datasheet page.

Sensor Probe IO + Water pH Sensor Datasheet

Sensor Probe IO Datasheet

• For details, refer to the Probe IO Datasheet.

Water pH sensor (JXBS-4001- pH) datasheet

PARAMETER			CONTENT
Transmitter	DC Power Supply		12 V - 24 VDC
	Power Consumption		≤ 0.15 W (@12 VDC, 25° C)
	Output signal		485 / 4 - 20 mA / 0 - 10 V
	Size		105 mm × 86 mm × 45.5 mm
Probe	Cable Length		5 meters (default)
	Response Time		≤ 15 s
	pH	Measuring Range	0 - 14 pH
		Measurement Precision	0.01 pH
		Resolution	± 0.5 pH (default)
	Temperature	Measuring Range	-10° C - 80° C
		Measurement Precision	0.1° C
		Resolution	0.1° C

Solar Cell System Specifications

Definition of Terms

List of Abbreviations

Abbreviation	Definition
BMS	Battery Management System
BMU	Battery Management Unit
BOL	Begin of Life
Bus-bar	Battery Pole Connecting Rod
CMC	Cell Manager Circuit
EOL	End of Life
HV	High Voltage
LV	Low Voltage
OCV	Open Circuit Voltage
SOC	Stage of charge

Terminologies

Terminology	Definition
Battery Cell	Commonly known as a battery. It is the fundamental unit of energy storage, which converts chemical energy to electrical energy.
Battery Module	Intermediate energy storage unit, comprising several individual cells and circuitry components, along with electrical and communication interfaces.
Battery Pack	A comprehensive power system consisting of multiple battery modules and circuits working together to supply power to electrical devices.
Rated Voltage	Refers to the approximate voltage value that a battery is designed to operate at or provide.
Capacity	The amount of electrical charge that a fully charged battery can store and subsequently provide to a device or system. It is typically measured in ampere-hours (Ah).
Energy Capacity	The total amount of energy that a fully charged battery can deliver under specific conditions. It is typically measured in watt-hours (Wh) or kilowatt-hours (kWh).
Rated Capacity	The minimum capacity that a fully charged battery can deliver at the beginning of its life (BOL), typically measured under specific conditions such as a discharge rate of 1C (discharge C-rate).
Units	V: Volt, voltage A: Ampere, current Ah: Ampere-hour, charge Wh: Watt-hour, electrical energy Ω: Ohm, resistance ° C: degrees Celsius, temperature mm: millimeter, length s: seconds, time kg: kilogram, weight Hz: Hertz, frequency

Main Specifications

Parameter	Specifications	Remark
Battery Model	RAK9154
Battery Cell Model	Rechargeable cylindrical lithium-ion battery H18650CH	H18650CH or equivalent product.
Rated Capacity	5200 mAh
Rated Voltage	10.8 V	Single battery voltage 3.6 V
Operating Voltage Range	9 V ~ 12.6 V
Rated Power	56.16 Wh
SOC Transportation Range	50 %
Operating Temperature	Charging temperature: 0° C ~ 45° C Discharge temperature: -20° C ~ 60° C
Storage Temperature	-20° C ~ 60° C	More than three months @25° C
Operating Humidity	20~80° %RH
PV Input	18° V/1.0° A	Typical
Maximum PV Input Voltage	30 V	Open circuit voltage
Maximum Continuous Charging Current	0.2 C (1.0 A)	Limited by solar charger
Maximum Continuous Discharging current	0.4 C (2.0 A)
∆ Voltage	≤20 mV	SOC 30 % ~ 60 %; rest for at least 2 hours after charging or discharging
Weight	0.85 Kg
Size	Length: 180 (±3) mm Width: 130 (±3) mm Height: 60 (±3) mm

Interfaces

Battery System Structure

As illustrated in Figure 2, the RAK9154 battery system comprises two sets of three 2600 mAh battery units connected in series. The system also incorporates one (1) BMS board integrated with an 18 V input solar charger.The RAK9154 battery system is depicted in Figure 2. This battery system comprises two sets of three 2600 mAh battery cells connected in series, accompanied by a BMS board that integrates an 18 V input solar charger.

Figure 1: RAK9154 battery system

Electrical Characteristics

Figure 1: RAK9154 electrical schematic diagram

Figure 1: System circuit schematic diagram

Connector	Connector Socket Model	Connector Plug Model	Definition	Remark
Gateway Load	SP1110/P4	SP1110/P4-N	Pin1: P+	SP11 IP67 Rated current 2 A Contact diameter 0.75 mm * 4
			Pin2: P-
			Pin3: R485A
			Pin4: RS485B
Sensor Hub Load	SP1110/P5	SP1110/P5-N	Pin1: P+	SP11 IP67 Rated current 2 A Contact diameter 0.75 mm * 4
			Pin2: P-
			Pin3: TXD
			Pin4: 3V3_In
			Pin5: RXD
PV Input	SP1110/P2	SP1110/P2-N	Pin1: PV+	SP11 IP67 Rated current 1 A Contact diameter 0.75 mm * 4
			Pin1: PV-

Sensor Characteristics

The following table shows the sensor data definition and the data format of the water pH solution.

• Sensor Data Definitions

Sensor Name	Sensor Type	Data Length	Range	Unit
Water pH	0x15	2	0-14	pH

• Data Format

ID (Channel)	Type	Data
1 Byte	1 Byte	2 Bytes

With the defined data, here's how to interpret the payload received data:

• Data Example

Payload (hexadecimal) received data is: 15 C1 04 3E

ID (Channel)	Type	Data
15	C1	043E

15C1 (Water pH) - 043E (Data)

Convert the value to decimal:

04 3E (hex) = 1086 (dec)
1086 × 0.01 (conversion coefficient) = 10.86 pH

Environmental Requirements

Transportation Requirements

WARNING

• When transporting the battery, avoid severe vibrations, shaking, and exposure to sunlight or rain.
• Do not invert the battery to prevent potential short circuits.
• During loading and unloading, exercise caution to prevent the battery from falling, rolling, enduring heavy pressure, or being inverted.

Storage Requirements

Store the module in a partially charged state, typically around 40% state of charge (SOC). Ensure the storage environment meets the following requirements:

Temperature and Humidity

Parameter	Description	Remark
Temperature	-30° C to 50° C 0° C to 25° C	Time period < 3 months Time period > 3 months
Humidity	2 %RH to 90 %RH	< 85 % Recommended

• Storage Environment: Store the product in a clean, ventilated, and cool environment, avoiding direct sunlight, high temperatures, corrosive gases, severe vibration, mechanical shaking, and heavy pressure. Keep the product away from heat sources and store it at an altitude below 1500 meters, maintaining atmospheric pressure between 86 kPa and 106 kPa.

• Maintenance: Charge and discharge the device once a month while storing it at room temperature or in a dry and ventilated environment. If storing the device takes more than 30 days, adjust the SOC to 40 % after charging.

The operation of the product must adhere to the provided operating instructions. Installation, maintenance, and usage of this product must strictly comply with relevant safety regulations.

warning

• Avoid storing or using the product in high-temperature environments, and keep it away from heat sources. Temperatures outside the safe range can significantly reduce the performance and lifespan of the product, and may even cause serious consequences such as combustion and explosion.
• Do not store or use the product in environments with high static electricity or high electromagnetic radiation. Doing so may damage the electronic components of the battery, leading to safety hazards.
• Avoid exposing the battery to water or immersing it in water. Otherwise, it may result in internal short circuits, loss of function, or abnormal chemical reactions, leading to fire, smoke explosion, and other incidents.
• If you notice any smoking, heating, discoloration, deformation, or any other abnormalities during the use, storage, transportation, and service of the product, contact a professional immediately for assistance.
• Do not discard waste batteries in fires or incinerators. Waste batteries should be recycled by professional institutions or organizations.
• It is strictly prohibited to place heavy objects on the product or stack them on top of each other.
• Although this module is not a high-voltage energy storage device, improper operation and use of the device may lead to serious consequences such as combustion and explosion.
• Only professional technicians must handle the installation and maintenance of the battery system. All operations must strictly adhere to relevant safety regulations. Non-professionals are strictly prohibited from installing, maintaining, and misusing the battery system.