GF Signet 2610 MODBUS Process Optical Dissolved Oxygen Sensor - Manual (Page 3)

3 2610 DO Sensor MODBUS Manual
Live Salinity Value
The live salinity value is used to correct the oxygen concentration value for salinity. Values must be written
in Practical Salinity Units (PSU) in the range 0 to 42 PSU. This is not a measured parameter.
Default Salinity Value
The default salinity value is loaded into the live salinity value register when power is fi rst applied to the
probe. The default salinity value is used in calculations until a live salinity value is written. This is not a
measured parameter.
Live Barometric Pressure
The live barometric pressure is used in the calculation of percent saturation and to determine the theoretical
saturation point during calibration. Values must be written in millibars in the range 506.625 to 1114.675
mbar. This is not a measured parameter.
Default Barometric Pressure
The default barometric pressure is loaded into the live barometric pressure register when power is applied
to the probe. The default barometric pressure is used in calculations until a live barometric pressure is
written. This is not a measured parameter.
100% Saturation Calibration Values
These values represent the sensor conditions while the probe is in a 100% saturation calibration
environment. These are not measured values, they are written by the controller during the calibration
process.
Writes to these registers are only accepted if the probe is in the calibration mode. The probe will return
exception 0x85 (invalid device command sequence) if an attempt is made to write these registers when the
calibration mode is off.
0% Saturation Calibration Values
These values represent the sensor conditions while the probe is in a 0% saturation calibration environment.
These are not measured values, they are written by the controller during the calibration process.
Writes to these registers are only accepted if the probe is in the calibration mode. The probe will return
exception 0x85 (invalid device command sequence) if an attempt is made to write these registers when the
calibration mode is off.
Calibration Slope and Offset
These values represent the slope and offset that will be applied to the raw concentration reading from the
sensor to generate the fi nal values reported by the sensor parameters. These registers may be written
independently of the normal internal calibration procedure.
Calibration Registers
Register
Size
(registers)
Mode & Access
Level (R/W)
Data
Type
Description
40118 2 R1/W3 fl oat Live salinity value (PSU)
40120 2 R1/W3 fl oat Default salinity value (PSU, default = 0.0)
40122 2 R1/W3 fl oat Live barometric pressure (mbar)
40124 2 R1/W3 fl oat Default barometric pressure (mbar, default = 1013.25)
40126 2 R1/W3 fl oat 100% saturation calibration reading (mg/L)
40128 2 R1/W3 fl oat 100% saturation temperature reading (°C)
40130 2 R1/W3 fl oat 100% saturation salinity value (PSU)
40132 2 R1/W3 fl oat 100% saturation barometric pressure (mbar)
40134 2 R1/W3 fl oat 0% saturation calibration reading (mg/L)
40136 2 R1/W3 fl oat 0% saturation temperature reading (°C)
40138 2 R1/W3 fl oat Calibration slope (default = 1.0)
40140 2 R1/W3 fl oat Calibration offset (default = 0.0)