How To Use The Recorder Output - Martek MARK 22 Operation Manual

4 - OPERATION
4.2.5 How to use the Recorder
Output
There are some instances when it is desir-
able to hook up the Mark 22 to a strip chart
or line recorder in addition to or to substitute
for the Mark 22's own internal logging capa-
bility. A likely example would be for moni-
toring on-line instrumentation that is already
using analog recorders for data acquisition.
The Mark 22 comes with a simultaneous
0-1 volt DC recorder output for conductivity
and temperature or conductivity and pH.
the pH sensor is not connected to the Mark
22, the pH recorder output signal will con-
vert to a temperature recorder output signal.
Refer to Figure 4.3 cable interface for wire
lead identification.
In order to use the analog recorder output,
the DB25-style connector on the serial cable
(P/N 603050) must be removed and the wires
tinned before connecting to the recorder. Once
the recorder has been attached to the Mark
22, the user
recorder output for the associated parameter.
The Mark 22 automatically defaults to the
recorder output set up after the solution com-
pensation for conductivity and pH have been
entered into the Mark 22. The following mes-
sage will be flashing in the display:
SETUP RECORDER
ZERO-FULL SCALE
Pressing the SELECT key will cause the
Mark 22 to display the following:
COND=#1
SELECT CHANNEL
22
can calibrate each
pH=#2
and the COND=#1 will be flashing. Output
#1 is for conductivity and Output #2 is for
pH. Press the SELECT key again and the
Mark 22 displays:
ZERO
RECORDER # 1
and the ZERO will be flashing. Now, if the
SELECT key is depressed again with the
Mark 22 connected to the recorder, the unit
If
will send a 0 Volt signal to the recorder to
simulate zero. The prompt will automatically
shift to FULL. By pressing the SELECT key
again, the Mark 22 will send a 1 Volt signal
to the recorder to simulate full scale. To re-
turn to the previous menu, press the EXIT
key. The pH=#2 prompt will now be flash-
ing and you can repeat the same procedure
for the pH analog signal. Upon completion,
press the EXIT key to return to the Display
Monitoring Mode.
FULL
Martek Instruments, Inc.