Condition The Sensor - Hach HIAC HRLD Serie Manual Del Usuario

D A N G E R
Chemical exposure hazard. Obey laboratory safety procedures and
wear all of the personal protective equipment appropriate to the
chemicals that are handled. Refer to the current safety data sheets
(MSDS/SDS) for safety protocols.
Make sure to flush the cell and sample lines completely with clean,
particle-free water immediately before use. Make sure that there are no
leaks in the sampling system to get accurate samples. Make sure that
the sample is compatible with water before use.
Note: Cover removal will void the warranty.
The sensor operates automatically with the connected particle counter
and the sampler systems. To optimize the sensor performance:
• Use standard particle counters with the sensor such as the HIAC
Model 8000A or 9064. When a sensor is used with one of these
particle counters, the applicable calibration algorithm is interpolation
(curve fit). Do not use the equation algorithm.
• Make sure to flush the tubing and the microcell with clean miscible
liquids between different sample analyses.
• Powder sample: Make sure to select an applicable liquid to prepare a
powder suspension for the analyses. For a stable dispersion, use a
surfactant. Ultra-sonification just prior to sample analysis is
recommended.
• Keep the sample at ambient temperature. Cold liquids can cause
water condensation on the microcell window.
• Make sure that the sensor microcell is kept clean when the sensor is
not in use. If the microcell is not clean and is allowed to dry, particle
residue forms on the microcell windows and causes bad interference
with the laser beam. This becomes difficult to clean.
• Make sure that all samples are compatible with the components used
in the sample path.
• Do not let particles go in the microcell if the dimensions of the
particles are close to the maximum cross section of the microcell. The
microcell dimension (width) is very small.
8 English
Note: Clean the microcell if number counts are too high in the first channel for a
"clean" liquid, or if an over concentration is found. Refer to
the microcell on page 9.

Condition the sensor

When oil applications are used, the sensor flow cell (microcell) must be
conditioned for use with oils. When the application is water soluble or
cleaning functions are used, the sensor flow cell must be conditioned for
water.
Contact technical support for assistance about the miscibility of a liquid
and its compatibility with the sensor.
Note: All solutions used to condition the sensor for oil to water and water to oil
activities must be particle free liquids.
To change the application from water to oil, complete this procedure.
Otherwise, erroneous counts will result.
Items to collect:
• Clean water
• Alcohol (isopropyl)
• Filtered mineral spirits
• Clean particle free oil
1. Flush the sensor with clean water.
2. Flush the sensor with alcohol (typically isopropyl alcohol).
3. Flush the sensor with filtered mineral spirits several times.
4. Flush the sensor with clean (particle free) oil before the actual
sample analysis with oil. The sensor is ready for oil application.
5. To change from an oil to an aqueous application, complete the above
procedure in the reverse order (i.e., flush the sensor with filtered
mineral spirits, then flush with alcohol, and last flush with water). The
basis for this procedure is that one fluid is used after the other must
be miscible. Immiscibility will make droplets and cause false particle
counts, which may collect layers on the windows of the cell.
Clean the sensor and