24 3600 Analyzer for O
2
Measurement—Operator’s Manual
3600O2.OM.E9903
Range Output Explanation
0–5V 0–20mA 4–20mA
0 0 4 Overrange, thermal cutoff, out of bounds
0.5 2 5.6 Lowest range
1 4 7.2 2nd range
1.5 6 8.8 3rd range
2 8 10.4 Not used
2.5 10 12 Not used
3 12 13.6 Not used
3.5 14 15.2 Custom analog output
4 16 16.8 Negative O
2
signal
4.5 18 18.4 Menu (during operations under “modify options” or “calibrate”)
5 20 20 Sensor disconnected (“Check the Sensor” message appears)
Note: The range analog output is replaced by the oxygen measurement output in certain instrument
models, providing two equivalent gas output signals for control applications. These models are
denoted by “2 gas” in the Instrument Configurations list, section 3).
1.4.5 Serial Output
If you use the instrument’s RS-232 interface for connection to a serial printer,
monitor, or computer, highlight “Serial Output” under the “Modify Options”
menu and press “ENTER” to bring up the following screen:
RS-232
AUTO MANUAL
When “Auto” is selected, the RS-232 interface will output a three-line display
every four seconds, showing gas concentration, sample temperature, and external
pressure. (The external pressure “value” will be present even if no such external
pressure sensor is connected.)
The “Manual” RS-232 output permits you to send just one set of measurements—
gas, temperature, and external pressure—to a device at one time. Once enabled,
you may send this information to a printer or other computer while the instrument
is in “Measurement” mode by pressing “ENTER”.
For RS-232 wiring instructions, see section 2.1.4.3. Pertinent communications
parameters are: Baud rate: 9600. Stop Bit: 1. 8 Data Bits. Parity: None.
Orbisphere offers a data logging program (model 32680.E) running under
Windows
®
to store this information. See section 1.7 for operating instructions.
This connection also can be used with a personal computer equipped with the
Windows 3.1 “Terminal” program, the Windows 95/98 “HyperTerminal” program,
or various third-party communications software such as ProComm or Crosstalk.
1.4.6 Salinity and Chlorinity Adjustments
If you want to inform the instrument of high salinity or chlorinity conditions that
could otherwise affect oxygen measurement, a corrective menu is available.
Pressing “ENTER” when “Salinity” is blinking under the “Modify Options” menu
displays this screen:
SAL. CORRECTION
DISABLED ENABLED
Note that both chlorinity and salinity are covered in this menu. Press “ENTER”
when “Enabled” is blinking, and this screen appears:
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