ANB pH Sensors topic

Sensor Datasheet

• AQ5 and AQ50 Flyer
• User Guide

Power Requirements

This sensor is a power hog. It draws ~90mA when measuring and ~60mA when idle. This doesn't seem so bad, until you consider that the sensor could possibly take up to 4.25 minutes to take a sample after the first power on. For some ideas of how long your battery might last with this sensor, see the description of the battery housing on the product page, which includes a chart.

Some recommendations:

• Get a beefy 12V battery and 18V solar panel - regardless of your measurement interval.
• If you want measurements more often than every 5 minutes, leave the sensor always powered
  • Size your battery and solar panel accordingly - it will be hungry!
• If you want measurements every 15 minutes or more, turn off power between readings and be aware that the time of the measurement will be offset from the time the logger woke or other sensors took measurements by the time it takes the pH sensor to warm up and take a reading.

Sensor Constructor

Example Code

An ANB Sensors pH sensor is used in the menu a la carte example.

Classes

class ANBpH

The Sensor sub-class for the ANB pH sensors.

class ANBpH_pH

The Variable sub-class used for the pH from an ANB Sensors pH sensor.

class ANBpH_Temp

The Variable sub-class used for the temperature output from a ANB Sensors pH sensor.

class ANBpH_Salinity

The Variable sub-class used for the salinity output from an ANB Sensors pH sensor.

class ANBpH_SpCond

The Variable sub-class used for the specific conductance output from a ANB Sensors pH sensor.

class ANBpH_EC

The Variable sub-class used for the raw electrical conductivity output from an ANB Sensors pH sensor.

class ANBpH_HealthCode

The Variable sub-class used for the health code output from a an ANB Sensors pH sensor.

class ANBpH_DiagnosticCode

The Variable sub-class used for the diagnostic code output from a an ANB Sensors pH sensor.

class ANBpH_StatusCode

The Variable sub-class used for the status code output from a an ANB Sensors pH sensor.

Defines

#define ANB_PH_MINIMUM_REQUEST_SPACING = 250

The minimum spacing between requesting responses from the sensor.

Sensor Variable Counts

The number of variables that can be returned by an ANB Sensors pH sensor

#define ANB_PH_NUM_VARIABLES = 8

Sensor::_numReturnedValues; an ANB Sensors pH sensor can report 8 values.

#define ANB_PH_INC_CALC_VARIABLES = 0

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

Sensor Timing

The sensor timing for an ANB Sensors pH sensor

The ANB pH sensor takes >3 minutes to complete the first sample after being turned on, but ~6s to complete a subsequent measurement when in continuous power and continuous sampling mode. If the immersion sensor is enabled and a measurement is requested while the sensor is not immersed, the failure response can return in <4 seconds.

More information on the timing can be found in the [sensor output section of the ANB Sensors User Guide](https://www.anbsensors.com/newdocs/docs/sensor-output)

#define ANB_PH_WARM_UP_TIME_MS = 5400L

Sensor::_warmUpTime_ms; time before sensor responds after power - roughly 5.3 - 5.6 seconds.

#define ANB_PH_WARM_UP_TIME_MAX = 10000L

The maximum time to wait for a modbus response.

#define ANB_PH_STABILIZATION_TIME_MS = 50

Sensor::_stabilizationTime_ms; the ANB pH sensor does not need to stabilize, but we use this time as the check for ready time.

#define ANB_PH_STABILIZATION_TIME_MAX = 5000L

The maximum time to wait for ready to measure.

#define ANB_PH_2ND_IMMERSION_ERROR = 4000L

The minimum time before a failure response is returned on the 2nd or subsequent value when the immersion sensor is not immersed. This is a guess based on testing.

#define ANB_PH_2ND_IMMERSION_ERROR_MAX = 12000L

The minimum time before a failure response is returned on the 2nd or subsequent value when the immersion sensor is not immersed. This is a guess based on testing.

#define ANB_PH_2ND_VALUE_HIGH_SALT = 5000L

The minimum time for the 2nd or subsequent values in high salinity (documented new output time of 10.5s)

#define ANB_PH_2ND_VALUE_HIGH_SALT_MAX = 15000L

The maximum time for the 2nd or subsequent values in high salinity.

#define ANB_PH_2ND_VALUE_LOW_SALT = 6000L

The minimum time for the 2nd or subsequent values in low salinity (documented new output time of 14s).

#define ANB_PH_2ND_VALUE_LOW_SALT_MAX = 18000L

The maximum time for the 2nd or subsequent values in low salinity (documented new output time of 14s).

#define ANB_PH_1ST_IMMERSION_ERROR = 6000L

The minimum time before a failure response is returned on the first measurement when the immersion sensor is not immersed. This is a guess based on testing.

#define ANB_PH_1ST_IMMERSION_ERROR_MAX = 12000L

The maximum time before a failure response is returned on the first measurement when the immersion sensor is not immersed. This is a guess based on testing.

#define ANB_PH_1ST_VALUE_HIGH_SALT = 120000L

The minimum time for the first value in high salinity (documented min time of 129s - 9s).

#define ANB_PH_1ST_VALUE_HIGH_SALT_MAX = 248000L

The maximum time for the first value in high salinity (documented max time of 238s for a long interval delay + 10s).

#define ANB_PH_1ST_VALUE_LOW_SALT = 155000L

The minimum time for the first value in low salinity (documented min time is 184s, but I got responses at 160s).

#define ANB_PH_1ST_VALUE_LOW_SALT_MAX = 265000L

The maximum time for the first value in low salinity (documented max time of 255s for a long interval delay + 10s).

pH

The pH variable from an ANB Sensors pH sensor

• Range is 0 to 14 pH
• Accuracy is ± 0.1 pH in low salinity water, ± 0.2 pH in high salinity water

#define ANB_PH_PH_RESOLUTION = 2

Decimals places in string representation; soil moisture should have 1.

#define ANB_PH_PH_VAR_NUM = 0

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

#define ANB_PH_PH_VAR_NAME = "pH"

Variable name in ODM2 controlled vocabulary;.

#define ANB_PH_PH_UNIT_NAME = "pH"

Variable unit name in ODM2 controlled vocabulary;.

#define ANB_PH_PH_DEFAULT_CODE = "ANBpHpH"

Default variable short code; "ANBpHpH".

Temperature

The temperature variable from an ANB Sensors pH sensor

• Range is -5°C to +40°C

#define ANB_PH_TEMP_RESOLUTION = 2

Decimals places in string representation; temperature should have 1 - resolution is 0.01°C.

#define ANB_PH_TEMP_VAR_NUM = 1

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

#define ANB_PH_TEMP_VAR_NAME = "temperature"

Variable name in ODM2 controlled vocabulary; "temperature".

#define ANB_PH_TEMP_UNIT_NAME = "degreeCelsius"

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

#define ANB_PH_TEMP_DEFAULT_CODE = "ANBpHTemp"

Default variable short code; "ANBpHTemp".

Salinity

The salinity variable from an ANB pH sensor

#define ANB_PH_SALINITY_RESOLUTION = 2

Decimals places in string representation; salinity should have 2.

#define ANB_PH_SALINITY_VAR_NUM = 2

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

#define ANB_PH_SALINITY_VAR_NAME = "salinity"

Variable name in ODM2 controlled vocabulary; "salinity".

#define ANB_PH_SALINITY_UNIT_NAME = "partPerThousand"

Variable unit name in ODM2 controlled vocabulary; "partPerThousand" (ppt or ppth)

#define ANB_PH_SALINITY_DEFAULT_CODE = "ANBpHSalinity"

Default variable short code; "ANBpHSalinity".

Specific Conductivity

The specific conductance variable from an ANB pH sensor

#define ANB_PH_SPCOND_RESOLUTION = 2

Decimals places in string representation; specific conductance should have 2.

#define ANB_PH_SPCOND_VAR_NUM = 3

Sensor variable number; specific conductance is stored in sensorValues[3].

#define ANB_PH_SPCOND_VAR_NAME = "specificConductance"

Variable name in ODM2 controlled vocabulary; "specificConductance".

#define ANB_PH_SPCOND_UNIT_NAME = "millisiemenPerCentimeter"

Variable unit name in ODM2 controlled vocabulary; "millisiemenPerCentimeter" (mS/cm)

#define ANB_PH_SPCOND_DEFAULT_CODE = "ANBpHSpCond"

Default variable short code; "ANBpHSpCond".

Electrical Conductivity

The raw electrical conductivity variable from an ANB pH sensor

#define ANB_PH_EC_RESOLUTION = 3

Decimals places in string representation; raw electrical conductivity should have 2.

#define ANB_PH_EC_VAR_NUM = 4

Sensor variable number; conductivity is stored in sensorValues[4].

#define ANB_PH_EC_VAR_NAME = "electricalConductivity"

Variable name in ODM2 controlled vocabulary; "electricalConductivity".

#define ANB_PH_EC_UNIT_NAME = "millisiemenPerCentimeter"

Variable unit name in ODM2 controlled vocabulary; "millisiemenPerCentimeter" (mS/cm)

#define ANB_PH_EC_DEFAULT_CODE = "ANBpHEC"

Default variable short code; "ANBpHEC".

Transducer Health Code

The health code variable from a ANB Sensors pH sensor

These codes indicate the health status of the sensor's transducer.

Transducer health details can be found here.

Detailed maintenance guidelines including how to abrade the sensor can be found here.

#define ANB_PH_HEALTH_CODE_RESOLUTION = 0

Decimals places in string representation; the health code has 0.

#define ANB_PH_HEALTH_CODE_VAR_NUM = 5

Sensor variable number; health code is stored in sensorValues[4].

#define ANB_PH_HEALTH_CODE_VAR_NAME = "instrumentStatusCode"

Variable name in ODM2 controlled vocabulary; "instrumentStatusCode".

#define ANB_PH_HEALTH_CODE_UNIT_NAME = "dimensionless"

Variable unit name in ODM2 controlled vocabulary; "dimensionless".

#define ANB_PH_HEALTH_CODE_DEFAULT_CODE = "ANBpHHealth"

Default variable short code; "ANBpHHealth".

Diagnostics Code

The diagnostics code variable from a ANB Sensors pH sensor

Sensor diagnostic output details can be found here.

#define ANB_PH_DIAGNOSTIC_CODE_RESOLUTION = 0

Decimals places in string representation; the diagnostic code has 0.

#define ANB_PH_DIAGNOSTIC_CODE_VAR_NUM = 6

Sensor variable number; diagnostic code is stored in sensorValues[4].

#define ANB_PH_DIAGNOSTIC_CODE_VAR_NAME = "instrumentStatusCode"

Variable name in ODM2 controlled vocabulary; "instrumentStatusCode".

#define ANB_PH_DIAGNOSTIC_CODE_UNIT_NAME = "dimensionless"

Variable unit name in ODM2 controlled vocabulary; "dimensionless".

#define ANB_PH_DIAGNOSTIC_CODE_DEFAULT_CODE = "ANBpHDiagnostic"

Default variable short code; "ANBpHDiagnostic".

Status Code

The status code variable from a ANB Sensors pH sensor

These codes indicate the current operational status of the sensor.

Sensor status code documentation is available here.

#define ANB_PH_STATUS_CODE_RESOLUTION = 0

Decimals places in string representation; the error code has 0.

#define ANB_PH_STATUS_CODE_VAR_NUM = 7

Sensor variable number; error code is stored in sensorValues[4].

#define ANB_PH_STATUS_CODE_VAR_NAME = "instrumentStatusCode"

Variable name in ODM2 controlled vocabulary; "instrumentStatusCode".

#define ANB_PH_STATUS_CODE_UNIT_NAME = "dimensionless"

Variable unit name in ODM2 controlled vocabulary; "dimensionless".

#define ANB_PH_STATUS_CODE_DEFAULT_CODE = "ANBpHStatus"

Default variable short code; "ANBpHStatus".

Define documentation