Yosemitech Y551 UV245/COD Sensor module

Sensor Datasheet

• Modbus Instructions

Sensor Constructor

Example Code

The Yosemitech Y551 UV245/COD sensor is used in the menu a la carte example.

#include <sensors/YosemitechY551.h>

// NOTE: Extra hardware and software serial ports are created in the "Settings
// for Additional Serial Ports" section

// NOTE: Use -1 for any pins that don't apply or aren't being used.
byte          y551ModbusAddress  = 0x50;  // The modbus address of the Y551
const int8_t  y551AdapterPower   = sensorPowerPin;  // RS485 adapter power pin
const int8_t  y551SensorPower    = A3;              // Sensor power pin
const int8_t  y551EnablePin      = -1;              // Adapter RE/DE pin
const uint8_t y551NumberReadings = 5;
// The manufacturer recommends averaging 10 readings, but we take 5 to minimize
// power consumption

// Create a Y551 chemical oxygen demand sensor object
YosemitechY551 y551(y551ModbusAddress, modbusSerial, y551AdapterPower,
                    y551SensorPower, y551EnablePin, y551NumberReadings);

// Create COD, turbidity, and temperature variable pointers for the Y551
Variable* y551COD =
    new YosemitechY551_COD(&y551, "12345678-abcd-1234-ef00-1234567890ab");
Variable* y551Turbid =
    new YosemitechY551_Turbidity(&y551, "12345678-abcd-1234-ef00-1234567890ab");
Variable* y551Temp =
    new YosemitechY551_Temp(&y551, "12345678-abcd-1234-ef00-1234567890ab");

Classes

class YosemitechY551

The Sensor sub-class for the Yosemitech Y551-B UV254/COD sensor with wiper.

class YosemitechY551_COD

The Variable sub-class used for the carbon oxygen demand (COD) output from a Yosemitech Y551-B UV254/COD sensor with wiper.

class YosemitechY551_Temp

The Variable sub-class used for the temperature output from a Yosemitech Y551-B UV254/COD sensor with wiper.

class YosemitechY551_Turbidity

The Variable sub-class used for the turbidity output from a Yosemitech Y551-B UV254/COD sensor with wiper.

Defines

#define Y551_NUM_VARIABLES = 3

Sensor::_numReturnedValues; the Y551 can report 2 values.

#define Y551_INC_CALC_VARIABLES = 0

Sensor::_incCalcValues; we don't calculate any additional values.

Sensor Timing

The sensor timing for a Yosemitch Y551

#define Y551_WARM_UP_TIME_MS = 1000

Sensor::_warmUpTime_ms; time before sensor responds after power - <500ms for response, but need >1000ms to load capcitors for brush & measure.

#define Y551_STABILIZATION_TIME_MS = 2000

Sensor::_stabilizationTime_ms; time between "StartMeasurement" command and stable reading - 2sec in manual & confirmed by testing.

#define Y551_MEASUREMENT_TIME_MS = 4000

Sensor::_measurementTime_ms; the Y551 takes ~2000ms to complete a measurement according to manual, but testing shows ~1s for a new number but 4-12s to elimniate memory effects, potentially from internal averaging.

Carbon Oxygen Demand

The COD variable from a Yosemitch Y551

• Range is:
  • 0.75 to 370 mg/L COD (equiv. KHP)
  • 0.2 to 150 mg/L TOC (equiv. KHP)
• Accuracy is not reported on sensor datasheet

#define Y551_COD_RESOLUTION = 2

Decimals places in string representation; cod should have 2 - resolution is 0.01 mg/L COD.

#define Y551_COD_VAR_NUM = 0

Sensor variable number; COD is stored in sensorValues[0].

#define Y551_COD_VAR_NAME = "COD"

Variable name in ODM2 controlled vocabulary; "COD".

#define Y551_COD_UNIT_NAME = "milligramPerLiter"

Variable unit name in ODM2 controlled vocabulary; "milligramPerLiter" (mg/L)

#define Y551_COD_DEFAULT_CODE = "Y551COD"

Default variable short code; "Y551COD".

Temperature

The temperature variable from a Yosemitch Y551

• Range is 5°C to + 45°C
• Accuracy is ± 0.2°C

#define Y551_TEMP_RESOLUTION = 2

Decimals places in string representation; temperature should have 2 - resolution is 0.01°C.

#define Y551_TEMP_VAR_NUM = 1

Sensor variable number; temperature is stored in sensorValues[1].

#define Y551_TEMP_VAR_NAME = "temperature"

Variable name in ODM2 controlled vocabulary; "temperature".

#define Y551_TEMP_UNIT_NAME = "degreeCelsius"

Variable unit name in ODM2 controlled vocabulary; "degreeCelsius" (°C)

#define Y551_TEMP_DEFAULT_CODE = "Y551Temp"

Default variable short code; "Y551Temp".

Turbidity

The turbidity variable from a Yosemitch Y551

• Range is 0.1~1000 NTU
• Accuracy is ＜5% or 0.3NTU

#define Y551_TURB_RESOLUTION = 2

Decimals places in string representation; turbidity should have 2 - resolution is 0.01 NTU.

#define Y551_TURB_VAR_NUM = 2

Sensor variable number; turbidity is stored in sensorValues[2].

#define Y551_TURB_VAR_NAME = "turbidity"

Variable name in ODM2 controlled vocabulary; "turbidity".

#define Y551_TURB_UNIT_NAME = "nephelometricTurbidityUnit"

Variable unit name in ODM2 controlled vocabulary; "nephelometricTurbidityUnit" (NTU)

#define Y551_TURB_DEFAULT_CODE = "Y551Turbidity"

Default variable short code; "Y551Turbidity".