HF scientific DRT-15CE Portable Turbidimeter - Manual (Page 13)

DRT-15CE (5/10) Page 5
7.0 CALIBRATION PROCEDURES
7.1 Calibration Standards
7.1.1 ProCal Standard Set (optional) Catalog No. 39071
HF ProCal Standards are recommended and certified by HF scientific.
They are traceable to freshly prepared formazin primary standards. These
standards are very easy to use off the shelf anytime without preparation
making them an ideal turbidity standard. A Certificate of Traceability is
available on request to the HF scientific Customer Service Department. HF
ProCal Standards may be used for calibration of HF turbidimeters. Order
from HF scientific, inc.
NOTE: Do not freeze standards.
Do not leave standards in the measuring well for extended
periods.
Do not shake standards.
Each ProCal Standard Kit contains:
-- 0.02 Calibration Standard
-- Certified ProCal Standards 10.00, 100.0, 1000 NTU
Standards are contained in preselected cuvettes with light
shield caps.
-- A sturdy storage case
7.1.2 Standard Formazin Solutions
Calibration of this instrument is based on Formazin, a material which is
made by polymerization.
Calibration samples may be obtained by diluting Formazin stock suspension
using “Turbidity-Free” water. Formazin stock suspension can be prepared
by the user (Reference Standard Methods For Examination of Water and
Wastewater) or a kit can be purchased from, HF scientific, inc.,
Catalog No. 50040.