Marathon F200060 User Manual

Marathon Sensors Inc.

Oxymit™ Transmitter

Operators Manual

F200060

Revision: 00 04/18/2001

01 04/23/2001 02 05/08/2001 03 09/19/2001 04 11/01/2001 05 11/21/2001

06 04/19/2002 07 10/30/2002 08 11/13/2002 09 11/06/2003 10 12/03/2003

11 09/30/2004 12 04/04/2005 13 04/11/2005 14 11/14/2006

All trademarks used in this publication are duly marked and the sole property of their respective owners. No attempt at trademark or copyright infringement is intended or implied.

Marathon Sensors makes no warranties express or implied beyond the written warranty presented at initial purchase. Marathon Sensors Inc. is not responsible for any product,

process, damage or injury incurred while using this equipment. Marathon Sensors makes no representations or warranties with respect to the contents hereof and specifically disclaims any warranties of merchantability or fitness for any particular application or purpose.

Table of Contents

GENERAL DESCRIPTION............................................................................................................................ 2

SAFETY SUMMARY......................................................................................................................................3

CONNECTIONS..............................................................................................................................................3

GROUNDING AND SHIELDING .........................................................................................................................4

PARAMETER SELECTIONS........................................................................................................................4

PROCESSPARAMETERS...................................................................................................................................4

Process Type.............................................................................................................................................5

Carbon Process Factor.............................................................................................................................5

Dew Point Process Factor........................................................................................................................ 5

Oxygen Exponent......................................................................................................................................6

TC Type.....................................................................................................................................................6

ANALOG OUTPUT CHANNELS .........................................................................................................................6

CALIBRATION...............................................................................................................................................7

PROCESS VARIABLE CALCULATIONS...................................................................................................8

PERCENTOXYGEN.......................................................................................................................................... 8

PERCENTCARBON..........................................................................................................................................8

DEWPOINT...................................................................................................................................................... 8

COMMUNICATIONS.....................................................................................................................................9

MODBUS.........................................................................................................................................................9

RTU Framing............................................................................................................................................ 9

Address Field.......................................................................................................................................... 10

Function Field......................................................................................................................................... 10

Data Field...............................................................................................................................................10

Error Check Field (CRC)........................................................................................................................10

MEMORY MAP.............................................................................................................................................12

OPERATIONAL SPECIFICATIONS..........................................................................................................18

NOTE:

Please specify the following parameters when ordering a transmitter; process type, process range (%, ppm), thermocouple type, temperature scale F/C, analog output 1 process and scale, analog output 2 process and scale.

Typical Oxygen Transmitter Calibration

(F840030)

Calibration Function

Measured Value or Input

Output / Units

Cold Junction Room Temp °F Thermocouple

min Thermocouple

max

800°F (B type) standard t/c type

3000°F (B type) standard t/c type

°F

Millivolt 0.0 mV Millivolts Millivolt 2000 mV Millivolts Analog 1 Zero 0% O2 4.0 mA +/- 0.1

Analog 1 Span 20.9% O2 20.0 mA +/- 0.1 Analog 2 Zero 800°F +/- 5° 4.0 mA +/- 0.1 Analog 2 Span 3000°F +/- 5° 20.0 mA +/- 0.1

Typical Carbon Transmitter Calibration

(F840031)

Calibration Function

Measured Value or Input

Output / Units

Cold Junction Room Temp °F Thermocouple Min Thermocouple Max

MUST BE SPECIFIED MUST BE SPECIFIED

°F

Millivolt 0.0 mV Millivolts Millivolt 2000 mV Millivolts

Analog 1 Zero 0% Carbon 4.0 mA +/- 0.1 Analog 1 Span 2.55% Carbon 20.0 mA +/- 0.1 Analog 2 Zero MUST BE

4.0 mA +/- 0.1

SPECIFIED

Analog 2 Span MUST BE

20.0 mA +/- 0.1

SPECIFIED

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11/14/2006 Rev. 14

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.

 SerialEEPROM 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 two4-20mA loop outputs. Typically one first loop is set up for the process value the second loop transmits probe temperature.

T/C INPUT

mV INPUT

+24V

24V

COM

5V_A

44M

EVENT INPUT

Power

Supplies

22M

A/D

CONV.

5V_A 5V_B

+15V

-15V +15V

-15V

EEPROM

Process

Controller

Figure 1 BLOCK DIAGRAM

5V_A

DISPLAY

CONN.

5V_A

5V_B

RS485

ISOLATED

RTX+

RTX-

ISOLATED

-15V

+15V

ANALOG

OUT 1

4-20mA

D/A

C C

ISOLATED

-15V

+15V

ANALOG

OUT 2

4-20mA

D/A

D D

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11/14/2006 Rev. 14

Safety Summary

All cautions and instructions that appear in this manual must be complied with to prevent personnel injury or damage to the Probe Transmitter or connected equipment. The specified limits of this equipment must not be exceeded. If these limits are exceeded or if this instrument is used in a manner not intended by Marathon Sensors Inc., damage to this

instrument or connected devices could occur.

Do not connect this device directly to AC motors, valves, or other actuators. All AC alarm functions must be connected through an interposing DC coil relay with a maximum coil load of 0.5 amps DC. The Probe Transmitter is not rated to act as a safety device. It

should not be used to provide interlocking safety functions for any temperature or process functions. Alarm capabilities are provided for probe test and input faults only and are not to be considered or used as safety contacts in any application.

Connections

The Probe Transmitter has four removable terminal blocks grouped with four terminals each. Each terminal is a wire clamp type with a standard slot screw. Each clamp can accommodate AWG 24 to 12 flexible stranded wire. Maximum torque on the terminal

screws should not exceed 0.8 Nm.

The figure below shows the arrangement of the terminals.

1 2 3 4

- + EVT EVT AO1 COM NO

LOWER

5 6 7 8

- + - +

TC MV

UPPER

9 10 11 12

- + - +

RS485 24VDC

LOWER

13 14 15 16

- + N/C N/C AO2

Figure 2 Terminal Layout

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11/14/2006 Rev. 14

The next figure shows a schematic representation of the Probe Transmitter and typical connections required in the field.

Figure 3 Schematic Connections

Grounding and Shielding

To minimize the pick-up of electrical noise, the low voltage DC connections and the sensor input wiring should be routed away from high-current power cables. Where it is

impractical to do this, use shielded cables with the shield grounded at the Probe Transmitter enclosure ground as show above.

Parameter Selections

The following tables list the parameters available in the Probe Transmitter. Default values are also listed. The default values are loaded if a reset is force in the device. Changes to

these parameters must be specified at the time of order.

Process Parameters

The following table shows the process selections and other parameters that effect the process value.

Page 4 of 23

11/14/2006 Rev. 14

+ 16 hidden pages

Marathon F200060 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual