Marathon F200060 manual General Description, Block Diagram

General Description

The Oxymit™ Transmitter has been designed to work as an analog or digital interface for any zirconia based oxygen probe used to track dew point, carbon potential, or oxygen. The transmitter connects to the temperature and millivolts outputs of an oxygen probe and can produce analog outputs proportional to the selected process value.

The features available are:

Isolated inputs for thermocouple and probe millivolt

24 bit Sigma-Delta ADC for inputs.

Serial EEPROM to store setup and calibration values.

Two isolated self-powered 4-20mA outputs for process value and temperature.

The transmitter makes a carbon or oxygen probe an intelligent stand alone sensor. The transmitter is located near the probe, preferably mounted in an enclosure. The transmitter mounts onto a DIN rail and requires a 24VDC power supply. It measures the probe temperature and millivolts. At the time of order the transmitter can be configured to calculate percent carbon, dewpoint, or percent oxygen from these inputs. The results of any of these calculations are made available via two 4-20mA loop outputs. Typically one first loop is set up for the process value the second loop transmits probe temperature.

+24V 12

Power

Supplies

24V	11
COM

5V_A

	5V_A
5V_A	5V_B	B	RS485
5V_B
+15V
-15V	A
+15V			ISOLATED
-15V
	ISOLATED
	5V_A
	D/A

10	RTX+
9	RTX-

+15V

T/C INPUT

mV INPUT

6

5

8

7

44M 22M

A/D

CONV.

3

EVENT INPUT

4

C	C	C
EEPROM
Process	ISOLATED
Controller
5V_A
	D/A
D	D	D

DISPLAY

CONN.

Figure 1 BLOCK DIAGRAM

1

ANALOG

OUT 1

4-20mA

2

-15V

+15V

14

ANALOG

OUT 2

4-20mA

13

-15V

Page 2 of 23

11/14/2006 Rev. 14