Marathon OXYMITH TRANSMITTER F200060 - Manual (Page 9)

Page 6 of 23
11/14/2006 Rev. 14
Oxygen Exponent
The range of oxygen is factory configured using the oxygen exponent number. Percent
oxygen is the standard setting where the oxygen exponent is set to 2 and the output range is
0.00% to 20.9%. For a part per million (ppm) range the exponent would be set to 6 and the
output range of 0.00 X 10
-6
to 99.99 X 10
-6
.
TC Type
The following table shows the available thermocouple types and the ranges. BOLD
indicates the typical oxygen default.
Thermocouple
type
Zero ºF Zero °C Span ºF Span °C
B 800 425 3000 1650
C 32 0 3000 1650
E 32 0 1300 700
J 32 0 1300 700
K 32 0 2300 1260
N 32 0 2300 1260
NNM 32 0 2000 1090
R 300 150 3000 1650
S 300 150 3000 1650
T 32 0 700 370
The Cold Junction correction is applied to all thermocouple types.
Analog Output Channels
The analog outputs are factory configured to provide 4 to 20mA signals proportional to
selectable process values.
NOTE
The Analog Output Channels are isolated self-powered
current sources and do not require an external supply.
If a chart recorder is to be used, it should have input specifications within 4 to 20 mA. If
the recorder only responds to VDC inputs it will be necessary to add a 250 ohm dropping
resistor across its input terminals.
The ideal location of the recorder is adjacent to the instrument but it may be located
remotely if the connecting wires are properly shielded. For best results, the chart recorder
input(s) should be isolated from ground.