1 Outline
1
1
Outline
This instrument is designed for the continuous stable measurement of concentration of TOC
(Total Organic Carbon) in pure water such as water for medical use. The measurement
method applies ultraviolet (UV) ray irradiation to flow-type quartz reaction tube, to oxidize
organic matter by UV oxidization. From the conductivity variation pre- and post- the reaction
tube, the concentration of generated carbon dioxide is calculated under the assumption that
organic carbon is to be oxidized into carbon dioxide, and the calculation result is converted
into TOC concentration.
The display area shows three parameters; TOC concentration, Conductivity, Temperature.
Each measurement range is as follows:
The concentration unit used here (ppb) is based on the mass ratio.
When the sample is measured for conductivity and temperature, the conductivity
compensated at 25
°
C is calculated and displayed according to the programmed temperature
characteristics of sample. The instrument is calibrated with sucrose solution which is standard
material for TOC.
The transmittance output allows TOC concentration. Two output patterns can be selected
between 4 mA to 20 mA DC and 0 V to 1 V DC (optional).
There are two contact outputs, defined as follows respectively;
Contact 1 (1c): Error, Hold, TOC concentration, Conductivity, Temperature (selectable)
Contact 2 (1a): TOC concentration
The wetted material inside the instrument includes SUS316, PFA, and quartz glass.
The instrument allows direct resin-piping to the overflow tank joint on the lower part of the
instrument.
The pump allows quantitative sampling to the instrument inside, which avoids interference due
to sample flow variation and pressure fluctuation.
The moving average count for the data converted to TOC concentration, conductivity, and
temperature can be set. Small count allows rapid response, and large count allows averaged
data acquisition.
TOC concentration
(ppb)
0 to 100.0
0 to 500.0
0 to 1000
Conductivity
(
µ
S/cm)
0 to 2
0 to 10
Temperature
(
°
C)
0 to 100