Voc Analysis - Hach BioTector B7000 User Manual

BioTector analysis types are optional features. In order to be able to utilize TC analysis
type in BioTector, the system must be built with this option. For instance, a system built
with TIC & TOC analysis option only cannot be used for TC analysis type. For TC
analysis to be possible in a TIC & TOC system, mechanical changes and modifications
in the system configuration will be required.
4.2.3.3

VOC Analysis

BioTector Volatile Organic Carbon (VOC) analysis type is a combination of TC analysis followed by a TIC &
TOC analysis. The VOC result obtained from the VOC analysis type represents the Purgeable Organic
Carbon (POC) content of the sample. When both TC and TIC & TOC analysis are complete, the flowing data
is available:

TC result, as measured and displayed from the TC analysis.

TIC result, as measured and displayed from the TIC & TOC analysis. TOC in TIC & TOC analysis
represents the NPOC.

TOC result including the VOC, which is calculated from the difference between the TC and TIC:
= TC – TIC
TOC
v
The TOC result displayed in VOC analysis type includes the purgeable organic element in the
sample. In other words the TOC result displayed is the TOC including VOC, which is the sum of
NPOC and POC:
TOC = NPOC + POC
v

VOC (POC) result, as calculated from the difference between the measured TC, from the TC
analysis, and the sum of measured TIC and measured TOC (NPOC), from the TIC & TOC analysis:
VOC (POC) = TC – (TIC + NPOC)
The NPOC, as measured from the TIC & TOC analysis, is not displayed, it is only used to calculate
the VOC (POC) element in the sample. All displayed results can be programmed in the system and
sent as 4-20mA output to an external device.
BioTector analysis types are optional features. In order to be able to utilize VOC
analysis type in BioTector, the system must be built with this option. For instance, a
system built with TIC & TOC analysis option only cannot be used for VOC analysis
type. For VOC analysis to be possible in a TIC & TOC system, mechanical changes
and modifications in the system configuration will be required.
BioTectors built with the VOC analysis option can be programmed on site to operate
with the TIC & TOC only or TC only analysis types.
Page 45