Sensecap Ph Sensor (s-ph-01) User Guide (+ PDF)

SENSECAP pH Sensor (S-pH-01) User Guide

Contents hide

1 Introduction

2 Wiring diagrams

3 Dimension

4 Installation Maintenance and Calibration

5 Output Signal Conversion

6 RS485 Modbus Protocol

7 Software Configuration Utility

8 Document Version

9 Documents / Resources

9.1 References

10 Related Posts

Introduction

S-PH-01 transmitter measures the PH of solution or semi-solid substrate. The output signal canbeRS485and Analog Voltage. The sensor is applicable for industrial, water processing, sewerage system, irrigation, smart agriculture etc.

Can be used for PH measurement
Output Interface with RS485, Voltage
High impedance and isolated electrode input
High accuracy with excellent stability
Reverse power protection and Built-in TVS/ESD protection

Specificatio ns
Output Interface	Analog Voltage 0-2V(Output resistance ~0ohm)	RS485 Modbus-RTU
Power Supply	3.9-30V/DC	3.9-30V/DC
Power Consumption	35mA@24V DC	35mA@24V DC
Start-up time	< 2 seconds
PH Measurement	High impedance and isolated input; Range: 0-14PH, Resolution: 0.01PH,Accuracy: +/-0.1PH; Can be used for solution or semi-solid substrate
Temperature Measurement(Option)	Range: -40~80°C, Resolution: 0.1°C, Accuracy: +/-0.5°C
IP Ratings	Electrode: IP68; Transmitter: IP65
Operating Temperature	-40~85°C
Installation	Electrode: 3/4″NPT screw threads; Transmitter: Mounting hole
Cable Length	Power and Signal Cable:2 meters or Customize; Electrode Cable: 5 meters
Dimension	Electrode: WidthDiameter 16030mm; 3/4″NPT screw threads Transmitter: 140mm65mm50mm

Wiring diagrams

Type	Wiring diagram
Analo g Voltag e Outpu t	Red (V+): Power Supply + Black (G): Power Supply – Blue (O1): Analog Output
RS485Modbus	Red (V+): Power Supply + Black (G): Power Supply – Yellow (T+): RS485+/A/T+ White (T-): RS485-/B/T-

Dimension

Electrode Dimension

Transmitter Dimension

*Note: Do not put the Transmitter into the liquid.

Installation Maintenance and Calibration

Installation

Installation locations of Electrodes will vary depending on the system design. The key is to monitor good representative sample of the whole solution directly after introduction of chlorine. The installation location must allow for complete contact of the scrubber liquid with the probes. Some example installation locations for Electrodes include the following:

Outlet of packed tower
Outlet of recycle pump
Pump bypass line
Heat Exchanger bypass line

Maintenance

Under normal conditions, electrodes can last anywhere from several months to several years depending on the type of operation, rate of production, strength of product, and quality of the raw materials used in the process.

Because each application is different, there is no average life expectancy. Because the pH responsive glass bulb or flat surface is relatively thin, care should be taken so that the bulb does not become scratched or broken. It is also important that ORP measuring surfaces are not
scratched or gouged. The suggestions in this sheet are intended to help avoid these problems. Coating of an electrode’s measuring surface can lead to erroneous readings including shortened span and wrest pones times. The type of coating determines the type of cleaning technique. Soft Coatings cambered moved by vigorous stirring, by use of a squirt bottle or, very carefully, by gently wiping with aloft, cleaning-abrasive paper or cloth. Hard Coatings should be chemically removed. The chemical used tore move the coating should be the least harsh chemical that dissolves the coating in 1 or 2 minutes undoes not attack the electrode’s materials of construction. For example, a calcium carbonate coating might be removed with 5% HCl (muriatic acid). Oily or Organic Coatings are best removed with detergents or an appropriate solvent that does not attack the electrode’s materials of construction. For example, isopropyl alcohol might be used but acetone should be avoided if the electrode’s body is made of CPVC.

Output Signal Conversion

PH output conversion

Output Interface	Parameters Range	Conversion Formula
Analog Voltage Output 0-2V	PH range: 0-14PH	PH=7.00VOLTAGE.When VOLTAGE=1.0V,then PH=7.001.00=7.
RS485Modbus-RTU	PH range: 0-14PH	PH= (REGISTER VALUE)/100.When REGISTERVALUE=7000,then PH= 7000/100=7.00.
RS485Modbus-RTU	Temperature range: -40-80°C	TEMPERATURE= (REGISTERVALUE)/100.WhenREGISTER VALUE=2013,then TEMPERATURE= 2013/100=20.13°C.

NOTE: The unit of VOLTAGE is (V)

RS485 Modbus Protocol

Modbus Protocol

Modbus Protocol is widely used to establish master-slave communication between intelligent devices or sensors. A MODBUS message sent from a master to a slave contains the address of the slave, the function code (e.g. ‘read register’ or ‘write register’), the data, and a check sum (LRC or CRC).

The sensor is RS485 interface with Modbus protocol. The default serial communication setting is slave address 1, Modbus rut, 9600bps, 8 data bits and 1 stop bit. All communication settings can be changed with Modbus command, and take effective after re-power up the sensor.

Following Modbus function code are supported by sensor.

Modbus Function Code 0x03 : used for reading holding register. Modbus Function Code 0x04 : used for reading input register. Modbus Function Code 0x06 : used for writing single holding register. Modbus Function Code 0x10: used for writing multiple holding registe

Modbus Register

Parameters	Register Addr. (HEX/DEC)	Dat a Typ e	Modbu s Functio nCode(DEC)	Range and Comments	Defaul t Value
TEMPRATURE	0x0000 /0	INT16RO	3/4	-4000-8000 for -40.00~80.00°C.	N/A
PHPHVALUE	0x0001 /1	UINT16RO	3/4	0-1400 for 0.00-14.00	N/A

TEMPCOMPENSA TEE N	0x0020 /32	UINT16R/W	3/6/16	0: ExternalTemperature sensor 1: Disabled	1
				2:On boardtemperature sensor

PHCALIBRAWAD0	0x0030 /48	UINT16	3/6/16	-2000~2000	N/A
PH calibration		R/W		for –
point for PH=4.01				2000~2000;
				Write 0xFFFF to
				calibrate.
PHCALIBRAWAD1	0x0031 /49	UINT16	3/6/16	-2000~2000	N/A
PH calibration		R/W		for –
point for PH=7.00				2000~2000;
				Write 0xFFFF to
				calibrate.
PHCALIBRAWAD2	0x0032 /50	UINT16	3/6/16	-2000~2000	N/A
PH calibration		R/W		for –
point for				2000~2000;
PH=10.01				Write 0xFFFF to
				calibrate.

SLAVEADDRESS	0x0200 /512	UINT16R/W	3/6/16	0-255	1 or 12
BAUDRATE	0x0201 /513	UINT16	3/6/16	0-6	3:9600bps
		R/W		0:1200bps
				1:2400bps
				2:4800bps
				3:9600bps
				4:19200bp
				s
				5:38400bp
				s
PROTOCOL	0x0202 /514	UINT16R/W	3/6/16	0-10:Modbus RTU	0:Modbu s RTU
PARITY	0x0203 /515	UINT16	3/6/16	0-2	0:Non
		R/W		0:Non	e
				e	Parity
				1:Eve
				n
				2:Odd
DATABITS	0x0204 /516	UINT16	3/6/16	1	1:8 databits
		R/W		1:8 databits
STOPBITS	0x0205 /517	UINT16R/W	3/6/16	0-10:1 stopbit1:2 stopbits	0:1 stopbit
RESPONSEDELAY	0x0206 /518	UINT16R/W	3/6/16	0-255 for 0-2550milliseconds	0
ACTIVEOUTPUTINTE RVAL	0x0207 /519	UINT16R/W	3/6/16	0-255 for 0-255seconds.	0

NOTE: UINT16:16 bit unsigned integer, INT16:16bit signed integer NOTE: RO: Register is Read Only, R/W: Register is Read/Write NOTE: HEX is Hexadecimal (data with 0x/0X prefix), DEC is Decimal

Modbus Register Detail Description

TEMPERATURE
Data Range	-4000-8000 For -40.00~80.00°C	Default: N/A
Power Down Save	N/A

Note: Temperature value (Binary complement).
Example: When REGISTER = 0x0702 (HEX format), then
VALUE=(0x07*256+0x02)/100=17.94°C.When REGISTER=FF05H (HEX format),then
VALUE=((0xFF*256+0x05)-0xFFFF-0x01)/100 =(0xFF05-0xFFFF- 0x01)/100=-2.51°C.

PH VALUE
Data Range	0-1400 for 0-14.00PH	Default: N/A
Power Down Save	N/A

Note: PH value
Example: When REGISTER = 0x02BC (HEX format), then VALUE=(0x02*256+0xBC)/100=7.00PH

TEMPCOMPENSATEEN
Data Range	0: External Temperature sensor 1: Disabled2:On board temperature sensor	Default: 1
Power Down Save	YES

Note: Temperature compensation

PHCALIBRAWAD0
Data Range	-2000~2000	Default: N/A
Power Down Save	YES

Note: PH calibration AD value for PH=4.01; Immerse the electrode into PH=4.01solutionand wait until the reading value being stable, then write 0xFFFF to this register to calibrate.

PHCALIBRAWAD1
Data Range	-2000~2000	Default: N/A
Power Down Save	YES

Note: PH calibration AD value for PH=7.00; Immerse the electrode into PH=7.00solutionand wait until the reading value being stable ,then write 0xFFFF to this register to calibrate.

PHCALIBRAWAD
Data Range	2000~2000	Default: N/A
Power Down Save	YES

Note: PH calibration AD value for PH=10.01; Immerse the electrode into PH=10.01solutionand wait until the reading value being stable, then write 0xFFFF to this register to calibrate

SLAVEADDRESS — Modbus Slave Address
Data Range	0-255	Default: 1 or 12
Power Down Save	YES