11
SPECIFICATIONS AND SETUP - 3
Martek Instruments, Inc.
3.3.3
Connecting The Temperature
Sensor
Remove the dust cap from the Mark 22
connector marked TEMP, insert the plug of
the temperature sensor, and secure. If the pH
Adapter Plug (P/N 180-51A) is used, plug
the temperature cable into the connector
marked TEMP on the Mark 22.
3.3.4
Connecting The Recorder
Cable
To hook up the Computer Interface Cable,
remove the dust cap from the Mark 22 con-
nector marked REC, insert the plug and se-
cure. Plug the DB25-style connector into the
appropriate port on the computer or printer
(See Section 4.2.4 for baud settings, etc.). To
connect the Mark 22 to an external strip-chart
or line recorder, remove the DB25 connector
and connect the wires to the recorder. Refer
to Section 4.2.5 for recorder output interface
cable connection .
3.3.5
Connecting The Battery
Charger
The charging jack is located below the
Mark 22 connector marked REC. When
charging the Mark 22 internal batteries, it is
important to follow these two steps:
A ) With the Mark 22 turned OFF, plug the
charging
plug into the charging jack.
B ) Plug the charger into a wall outlet that
carries
the same voltage as that listed on
the battery
charger. The Mark 22 can
now be turned ON.
The Mark 22 can be operated either on
AC or internal DC power. However,
the
Mark 22 should be operated only on DC
power when calibrating the instrument.
This will prevent AC electrical noise from
being coupled through the battery charger
and interefering with the parameter voltage
signal being calibrated.
