Thermo Fisher Scientific CyberScan TB 1000 Turbidimeter - Manual (Page 7)

CyberScan TB1000
4
4.2 Pour Through Sample Measurement (Optional Accessory)
Install the pour through assembly and index it according to the instruction sheet that accompanies the assembly.
The following steps describe how to measure the turbidity of a sample using the CyberScan TB1000 fitted with
the optional pour through assembly:
1.
Turn on the CyberScan TB1000. The instrument will be in the normal automatic mode (the "AUTO" block
should be illuminated). Allow instrument to warm up for at least 30 minutes.
2. Sample approximately 500 ml of the process stream as you would normally do for turbidity measurement.
3. Pour the complete 500 ml sample into the pour through assembly. Record the turbidity of the sample
displayed after the entire 500 ml sample has been poured into the assembly and the flow to drain has
ceased, and after the reading has stabilized.
4. If you are measuring and comparing more than one sample, pressing ENTER key will store the reading
(displayed on the lower row of the display). In addition, if you have selected printer output in the customer
setup section pressing ENTER key will output data to RS232 port.
5. Repeat steps 2 through 4 for all of your samples.
The sample cuvette used in the pour through assembly is identical to the two standard sample cuvettes supplied
with the CyberScan TB1000. Clean the cuvette on a periodic basis according to your experience with the type
and turbidity of the sample found in your facility.
5 Calibration Procedures
The CyberScan TB1000 Turbidimeter has been factory-calibrated using Eutech Instruments calibration standards
that are traceable to the primary turbidity calibration standard, Formazin. It is possible to use the instrument
directly out of the box. However, re-calibration of the instrument using the calibration set included is
recommended to allow you to become familiar with the operation of the instrument and the calibration procedures.
Eutech Instruments recommends that you use the following materials during calibration to
achieve the accuracy stated in this manual:
1.
De-ionized water filtered through a 0.2 µm filter, or 0.02 NTU Calibration Standard
2. 10.0 NTU Calibration Standard
3. 1000 NTU Calibration Standard
Under normal conditions, re-calibration is recommended at least once every three months. You can
select a predetermined calibration interval (see section 5.3) for automatic prompting for calibration: if
you exceed the selected calibration interval, the "Cal" block will flash until the instrument is re-
calibrated.
NOTE: It is well known that diluted Formazin is unstable. If you choose to use Formazin to calibrate the
CyberScan TB1000, ensure that you are using a fresh stock suspension of Formazin to achieve the accuracy
quoted for the CyberScan TB1000. The Eutech Instruments calibration standards are more stable than Formazin
and have a shelf life of 1 year. If you use the stable Eutech Instruments calibration standards to calibrate the
instrument, review the expiration date to ensure that the standards have not expired.
NOTE: The CyberScan TB1000 must be re-calibrated after lamp replacement.
5.1 Indexing the Calibration Standard(s)
The United States Environmental Protection Agency (US EPA) recommends that cuvettes used for instrument
calibration or sample measurement be indexed. To comply with this recommendation, each Eutech Instruments
calibration standard is supplied with an indexing ring and each CyberScan TB1000 is supplied with an indexing
pin for quick and repeatable indexing of the calibration standard. The white indexing pin is installed on the collar
ring around the optical well.