HF scientific Micro200BW Turbidimeter - 0-100 NTU - Manual (Page 40)

MICRO 200 BW 0-10 & 0-100 NTU (05/05)
Rev. 3.4
oughly 8 to 10 rinses in clean, distilled water, to remove
all streaks.
Figure 13
Critical Measurement Area
The sample flow must be shut off, with the shut-
off clamp on the inlet flexible tubing, when the cuvette
in the flow through unit is to be cleaned or changed (see
figure 14).
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.
5.2 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 display.
TO CHANGE THE LAMP MODULE SIMPLY
TURN THE OUTSIDE LOCKING RING
COUNTER CLOCKWISE, AND PULL THE MOD-
ULE 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 in-
structions. Refer to figure 14.
Shut-off clamp Back
Pressure Valve
Figure 14
Lamp Replacement
5.3 CALIBRATION PROCEDURES
5.3.1 Calibration Standards
5.3.1.1 Standard Set (optional) Catalog
No. 19820
HF Primary Standards are recommended
and certified by HF scientific. They are more stable than
Formazin and have a minimum shelf life of 12 months
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. Prior to calibration, review the expiration
dates, to ensure that the standards have not expired.
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 Primary Standard Kit contains:
-- 0.02 Calibration Standard
-- Certified Primary Standards 4.00, 10.00, 40.00,
100.00 NTU Standards are contained in preselected
cuvettes with light shield caps.
-- A sturdy storage case
5.3.1.2 Standard Formazin Solutions
We recommend that this instrument be calibrated on the
factory prepared
primary calibration stan-
dards to achieve the stated accuracy.
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