HF scientific Micro200BW Turbidimeter - 0 -1000 NTU - Manual (Page 42)

Page 28
MICRO 200 BW 0 - 1000 NTU (5/05)
Rev. 3.1
is accomplished by washing the interior and exterior of
the cuvette in a detergent solution, then rinsing thor-
oughly 8 to 10 rinses in clean, distilled water, to remove
all streaks.
Figure 12
Critical Measurement Area
The sample flow must be shut off, with the flow shut-
off clamp on the inlet flexible tubing, when the cuvette
in the flow through unit is to be cleaned or changed (see
figure 13).
Replace the cuvette if scratches or marks in the critical
area affect readings.
Store reusable cuvettes (Catalog No. 50036, pkg of 3)
in a clean dust-free environment.
B. LAMP REPLACEMENT
Periodically the LAMP MODULE, Cat. #21541, in the
sensor will require replacement. It is recommended that
one spare lamp for each MICRO 200 BW be kept on
hand at all times. A burned out lamp is indicated by a
flashing SENSOR AL indicator on the analyzer dis-
play. TO CHANGE THE LAMP MODULE SIM-
PLY TURN THE OUTSIDE LOCKING RING
COUNTER CLOCKWISE, AND PULL THE
MODULE STRAIGHT OUT. Reverse the procedure
to install the replacement module. For accurate opera-
tion a complete calibration is recommended after a
lamp module replacement. See page 29 for calibration
instructions. Refer to figure 13.
Flow shut-off clamp!
" Flow
Control Valve
Figure 13
Lamp Replacement
C. CALIBRATION PROCEDURES
1. Calibration Standards
a. Secondary Standard Set (optional) Catalog No.
19830
HF Secondary Standards are recommended and certi-
fied 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 HF
scientific Customer Service Department. HF Second-
ary Standards may be used for calibration of HF turbi-
dimeters. 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.
Specific instructions for using certified Secondary
Standards are included with the kit.
Each Secondary Standard Kit contains:
-- Instructions
-- 0.02 Reference Standard
-- Certified Secondary Standards 100.0, 400.0,
1000 NTU Standards are contained in preselected
cuvettes with light shield caps.
-- A sturdy storage case