Hach SIGMA 900, User Manual

Page: 19 / 94

Section 2
Page 19
8837hrd.fm
Setting Up the Intake Line and Strainer
2.4 Setting Up the Intake Line and Strainer
Note: If site conditions do not permit
the intake to slope downward from
the sampler to the sample source,
disable the liquid sensors and
calibrate the sample volume using
the Timed Calibrate method when
programming the sampler (see
section 6.2 on page 57 ).
For each sampling location, the intake line should be as short as practical,
and be free of any sharp bends, coils, or loops. Install the intake line with a
downward slope from the sampler to the sample source because:
• This will assure the complete drainage of the intake line when it is
air-purged before and after each sample, and will help to prevent
cross-contamination of the individual samples.
• Complete drainage is important in freezing conditions because liquid
sludge that remains could freeze and plug the line.
Place the sample intake and strainer in the mainstream of the sampling
source, in an area of turbulent and well mixed flow.
Note: Vertical lift should not exceed
27 ft. If your site requires more lift,
you may purchase the Remote
Pump Option. See
Parts and
Accessories on page 87 .
Also, account for the vertical location of the intake. A position too near the
surface may yield excess lighter materials, while a position too near the
bottom may yield excess heavy materials. The constituents of interest must
be considered when positioning the intake strainer.
2.5 Bottles and Retainers
Note: If changing from one multiple
bottle configuration to another, it
may be necessary to change the
distributor arm.
Install the bottles in the refrigerated compartment using the appropriate
retainer and/or positioner for the bottle(s) suppled with the sampler.
2.6 Power Connections
The sampler refrigerator operates on a 115 V ac (100 and 230 V ac optional),
and has an internal circuit breaker in the Power Junction Assembly Control
Box. The controller requires 12 V dc which is supplied via an internal ac/dc
power converter. The unit may be ordered with a 3-prong ac power cord or a
conduit connection suitable for a junction box and hard-wire permanent
installation.
Important: Whenever electricity is present, there is a possibility of electrical
shock. Before connecting the sampler to an ac power source follow these
safety precautions:
1. Check the power source to make sure that it satisfies the ac power
requirements of the sampler.
2. Make sure that all electrical installations and connections are in
accordance with national and local electrical codes.
3. Before performing any maintenance, disconnect the sampler from
the power source.
4. Do not attempt to make any connection or otherwise handle the electrical
components of the sampler when connected to ac line power if the
immediate area is wet, or if hands or clothing are wet.
5. If the circuit breaker or fuse in the ac power source is tripped, determine
the cause before restoring power to the sampler.