Eureka Manta Manual
Page 25 of 67
2)
The Sensors and Parameters List now contains the parameter “Turb_Mod”, which is the same
measurement as Turb_FNU, except NOT altered to make its response linear with formazin. It is
numerically equal to the earlier parameter Turb NTU.
3)
The Sensors and Parameters List now contains the parameter “Turb_NTU”. Turb_NTU is the same
measurement as Turb_FNU, except with units of NTU instead of FNU if you prefer that your data
are labeled NTU. Calibrating Turb_NTU also calibrates Turb_FNU, and vice-versa.
4)
The Sensors and Parameters List now contains the parameter “Turb2_FNU”. Turb2_FNU is the
same measurement as Turb_FNU (or Turb_NTU, if you prefer NTU’s), except multiplied by a
Turbidity Scale Factor. Turb2_FNU is a unique parameter that helps you match Eureka turbidity
readings with readings from other types of turbidity sensors for the sake of data continuity.
For instance, suppose you found that a Eureka turbidity sensor read 89 while another turbidity
sensor read 78 in the same sample. The Turbidity Scale Factor is 78/89 = 0.88. You can type that
Turbidity Scale Factor into the Manta when calibrating Turb2_FNU. Thereafter, all Turb2_FNU
readings
will be the Eureka turbidity readings multiplied by 0.88 to mimic the readings that you
would get with the other turbidity sensor.
The software specific to turbidity has changed as well, from 5.21 to 5.22.
In most cases, you can update your Manta’s software with these new softwares if you wish to take
advantage of the new features dealing with turbidity.
