Hanna Instruments HI 9141 - Manual (Page 3)

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PROBE FUNCTIONAL DESCRIPTION
1. Dissolved Oxygen (DO) probe
2. Protective cap
3. Watertight shielded cable
4. Polypropylene probe body
5. Temperature sensor
6. O-Ring seal
7. AgCl (silver chloride) anode
8. Platinum cathode (sensor)
9. Oxygen permeable membrane
10. Membrane cap
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HI 9141 and HI 91410 are portable, printing
DO meters designed for continuous monitor-
ing and recording at selectable time intervals.
The low-power printer uses regular paper that
is easily sourced and will not fade over time.
HI 91410 combines all of the comprehensive
printing functions of the HI 9141, with the
capability to log measurements. In addition
to supplying the user with instant print-outs
of DO, HI 91410 also provides datalogging
facilities that will store up to 8000 readings.
These measurements can be scrolled through
at any time, printed or even transferred to a
computer system for elaboration or perma-
nent storage. An optional HI 9200 infrared
transmitter can be used to take the data from
HI 91410 and send it to a computer without
any cords. Simply place the meter on the
cradle and, at the touch of a button, all of the
recorded lots are transferred in seconds. This
infrared connection is important in humid
environments, where a standard RS232 plug
on a meter could become damaged.
In addition to the automatic calibration fea-
ture, both meters automatically compensate
for altitude (from 0 to 1900 meters) and salin-
ity (from 0 to 40 g/L).
The dissolved oxygen probe has a membrane
covering the polarographic sensors and a built-
in thermistor for temperature measurements
and compensation. This permeable membrane
isolates the sensor elements from the testing
solution, but allows oxygen to enter. When a
voltage is applied across the sensor, oxygen
that has passed through the membrane re-
acts causing a current flow.
GENERAL DESCRIPTION
Hanna Instruments reserves the right to modify
the design, construction and appearance of its
products without advance notice.