RayTek MARATHON MM SERIES Operating Instructions Manual

MARATHON MM

SERIES

High-Performance Infrared Thermometer

Operating Instructions

Rev. D7 Jul 2017

58201

Contacts

Fluke Process Instruments



Americas

Santa Cruz, CA USA
Tel: [phone] (USA and Canada, only)
[phone]

[e-mail]

EMEA

Berlin, Germany
Tel: [phone]

[e-mail]

China
Beijing, China
Tel: [phone]

[e-mail]

Worldwide Service

Fluke Process Instruments offers services,
including repair and calibration. For more
information, contact your local office.

www.raytek.com

© Fluke Process Instruments
Specifications subject to change without notice.

WARRANTY

The manufacturer warrants this instrument to be free from defects in material and workmanship under normal use
and service for the period of two years from date of purchase. This warranty extends only to the original purchaser.
This warranty shall not apply to fuses, batteries, or any product which has been subject to misuse, neglect, accident,
or abnormal conditions of operation.

In the event of failure of a product covered by this warranty, the manufacturer will repair the instrument when it
is returned by the purchaser, freight prepaid, to an authorized Service Facility within the applicable warranty

period, provided manufacturer’s examination discloses to its satisfaction that the product was defective. The

manufacturer may, at its option, replace the product in lieu of repair. With regard to any covered product returned
within the applicable warranty period, repairs or replacement will be made without charge and with return freight
paid by the manufacturer, unless the failure was caused by misuse, neglect, accident, or abnormal conditions of
operation or storage, in which case repairs will be billed at a reasonable cost. In such a case, an estimate will be
submitted before work is started, if requested.

THE FOREGOING WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED OR IMPLIED,
INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS, OR
ADEQUACY FOR ANY PARTICULAR PURPOSE OR USE. THE MANUFACTURER SHALL NOT BE LIABLE
FOR ANY SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES, WHETHER IN CONTRACT, TORT,
OR OTHERWISE.

SOFTWARE WARRANTY

The manufacturer does not warrant that the software described herein will function properly in every hardware
and software environment. This software may not work in combination with modified or emulated versions of
Windows operating environments, memory-resident software, or on computers with inadequate memory. The
manufacturer warrants that the program disk is free from defects in material and workmanship, assuming normal
use, for a period of one year. Except for this warranty, the manufacturer makes no warranty or representation,
either expressed or implied, with respect to this software or documentation, including its quality, performance,

merchantability, or fitness for a particular purpose. As a result, this software and documentation are licensed “as
is,” and the licensee (i.e., the User) assumes the entire risk as to its quality and performance. The liability of the

manufacturer under this warranty shall be limited to the amount paid by the User. In no event shall the
manufacturer be liable for any costs including but not limited to those incurred as a result of lost profits or revenue,
loss of use of the computer software, loss of data, the cost of substitute software, claims by third parties, or for other

similar costs. The manufacturer’s software and documentation are copyrighted with all rights reserved. It is illegal

to make copies for another person.

Specifications subject to change without notice.

COMPLIANCE STATEMENT

The device complies with the requirements of the European Directives:

EC – Directive 2014/30/EU – EMC

EC – Directive 2011/65/EU – RoHS II

EN 61326-1: 2013 Electrical measurement, control and laboratory devices -

Electromagnetic susceptibility (EMC)

EN 50581: 2012 Technical documentation for the evaluation of electrical products with respect

to restriction of hazardous substances (RoHS)

Electromagnetic Compatibility Applies to use in Korea only. Class A
Equipment (Industrial Broadcasting & Communication Equipment)

This product meets requirements for industrial (Class A) electromagnetic wave equipment and
the seller or user should take notice of it. This equipment is intended for use in business
environments and is not to be used in homes.

Content

COMPLIANCE STATEMENT .......................................................................................................................... 5

CONTENT ............................................................................................................................................................ 6

1 SAFETY INSTRUCTIONS ........................................................................................................................... 10

2 PRODUCT DESCRIPTION .......................................................................................................................... 13

3 TECHNICAL DATA ...................................................................................................................................... 14

3.1 MEASUREMENT SPECIFICATIONS ............................................................................................................... 14

3.2 OPTICAL SPECIFICATIONS .......................................................................................................................... 16

3.2.1 Variable Focus ..................................................................................................................................... 16

3.2.2 Fixed Focus ......................................................................................................................................... 17

3.3 ELECTRICAL SPECIFICATIONS .................................................................................................................... 22

3.4 ENVIRONMENTAL SPECIFICATIONS ........................................................................................................... 22

3.5 DIMENSIONS ............................................................................................................................................... 23

3.6 SCOPE OF DELIVERY ................................................................................................................................... 23

4 BASICS ............................................................................................................................................................. 24

4.1 MEASUREMENT OF INFRARED TEMPERATURE .......................................................................................... 24

4.2 EMISSIVITY OF TARGET OBJECT.................................................................................................................. 24

5 ENVIRONMENT............................................................................................................................................ 25

5.1 AMBIENT TEMPERATURE ........................................................................................................................... 25

5.2 ATMOSPHERIC QUALITY ............................................................................................................................ 25

5.3 ELECTRICAL INTERFERENCE ...................................................................................................................... 25

6 INSTALLATION ............................................................................................................................................ 26

6.1 MECHANICAL INSTALLATION ................................................................................................................... 26

6.1.1 Distance to Object .............................................................................................................................. 26

6.1.2 Variable Focus ..................................................................................................................................... 26

6.1.3 Viewing Angles................................................................................................................................... 27

6.2 ELECTRICAL INSTALLATION ...................................................................................................................... 28

6.3 COMPUTER INTERFACING .......................................................................................................................... 30

6.4 MULTIPLE SENSORS IN A NETWORK .......................................................................................................... 32

6.4.1 Wiring ................................................................................................................................................ 32

6.4.2 Addressing .......................................................................................................................................... 33

6.4.3 Configuration Procedure .................................................................................................................... 33

7 OPERATION ................................................................................................................................................... 34

7.1 CONTROL PANEL ....................................................................................................................................... 34

7.2 OPERATION MODES ................................................................................................................................... 34

7.3 SIGNAL PROCESSING .................................................................................................................................. 37

7.3.1 Averaging ........................................................................................................................................... 37

7.3.2 Peak Hold ............................................................................................................................................ 38

7.3.2.1 Reset ............................................................................................................................................. 38

7.3.2.2 Signal Slope ................................................................................................................................. 39

7.3.3 Advanced Peak Hold ........................................................................................................................... 40

7.3.4 Valley Hold ......................................................................................................................................... 41

7.3.5 Advanced Valley Hold ........................................................................................................................ 41

7.4 INPUTS AND OUTPUTS ................................................................................................................................ 42

7.4.1 Milliamp Output ................................................................................................................................. 42

7.4.2 Relay Output....................................................................................................................................... 42

7.4.2.1 Thresholds .................................................................................................................................... 42

7.4.2.2 Deadband ..................................................................................................................................... 43

7.4.3 External Input ..................................................................................................................................... 44

7.4.3.1 Trigger .......................................................................................................................................... 44

7.4.3.2 Ambient Background Temperature Compensation ............................................................... 45

7.4.3.3 Emissivity Setting ........................................................................................................................ 47

7.5 FACTORY DEFAULTS ................................................................................................................................... 48

8 OPTIONS ......................................................................................................................................................... 49

8.1 LASER SIGHTING ......................................................................................................................................... 49

8.2 VIDEO SIGHTING ......................................................................................................................................... 50

8.3 AIR/WATER COOLED HOUSING ................................................................................................................. 53

8.3.1 Avoidance of Condensation ................................................................................................................. 54

9 ACCESSORIES ................................................................................................................................................ 55

9.1 OVERVIEW ................................................................................................................................................... 55

9.2 FIXED MOUNTING BRACKET ...................................................................................................................... 57

9.3 ADJUSTABLE MOUNTING BRACKET ........................................................................................................... 57

9.4 AIR PURGE COLLAR .................................................................................................................................... 58

9.5 SIGHT TUBE ................................................................................................................................................. 58

9.6 PIPE THREAD ADAPTER .............................................................................................................................. 59

9.7 RIGHT ANGLE MIRROR ............................................................................................................................... 60

9.8 INDUSTRIAL POWER SUPPLY ...................................................................................................................... 61

9.9 TERMINAL BOX ........................................................................................................................................... 62

9.10 LOW TEMP CABLE ..................................................................................................................................... 63

9.11 HIGH TEMP CABLE ................................................................................................................................... 64

9.12 PROTECTIVE WINDOW .............................................................................................................................. 65

9.13 THERMOJACKET ........................................................................................................................................ 66

9.14 {RESERVED}................................................................................................................................................ 66

9.15 {RESERVED}................................................................................................................................................ 66

10 PROGRAMMING GUIDE .......................................................................................................................... 67

10.1 SERIAL INTERFACE VERSUS CONTROL PANEL ......................................................................................... 67

10.2 STORING OF PARAMETERS ........................................................................................................................ 67

10.3 COMMAND STRUCTURE ............................................................................................................................ 67

10.3.1 Requesting a parameter (Poll Mode) ................................................................................................. 67

10.3.2 Setting a parameter (Poll Mode) ....................................................................................................... 67

10.3.3 Sensor response ................................................................................................................................. 68

10.3.4 Sensor notification............................................................................................................................. 68

10.3.5 Error Messages .................................................................................................................................. 68

10.4 TRANSFER MODES .................................................................................................................................... 68

10.5 CHECKSUM ................................................................................................................................................ 69

10.6 BURST MODE ............................................................................................................................................. 70

10.6.1 Speed ................................................................................................................................................. 70

10.6.2 Minimum Baud Rate......................................................................................................................... 71

10.7 SENSOR INFORMATION ............................................................................................................................. 71

10.8 SENSOR SETUP ........................................................................................................................................... 72

10.8.1 General Settings ............................................................................................................................... 72

10.8.2 Sample Time ..................................................................................................................................... 72

10.8.3 Temperature Pre-Processing ............................................................................................................. 72

10.8.4 Temperature Range........................................................................................................................... 74

10.8.5 Emissivity Setting ............................................................................................................................ 74

10.8.6 Ambient Background Temperature Compensation ........................................................................... 74

10.8.7 Temperature Hold Functions ............................................................................................................ 74

10.9 SENSOR CONTROL .................................................................................................................................... 75

10.9.1 Current Output ................................................................................................................................ 75

10.9.2 Relay Output .................................................................................................................................... 75

10.9.3 External Input .................................................................................................................................. 76

10.9.4 Lock Mode ......................................................................................................................................... 76

10.10 RS485 COMMUNICATION ...................................................................................................................... 77

10.11 MULTIDROP MODE................................................................................................................................. 77

10.12 COMMAND LIST ..................................................................................................................................... 78

11 MAINTENANCE .......................................................................................................................................... 81

11.1 TROUBLESHOOTING MINOR PROBLEMS .................................................................................................. 81

11.2 FAIL-SAFE OPERATION ............................................................................................................................ 82

11.3 CLEANING THE LENS ............................................................................................................................... 83

12 APPENDIX..................................................................................................................................................... 84

12.1 DETERMINATION OF EMISSIVITY .............................................................................................................. 84

12.2 TYPICAL EMISSIVITY VALUES ................................................................................................................... 84

13 NOTICES ....................................................................................................................................................... 88

Safety Instructions

10 Rev. D7 Jul 2017 Marathon MM

1 Safety Instructions

This document contains important information, which should be kept at all times with the instrument
during its operational life. Other users of this instrument should be given these instructions with the
instrument. Eventual updates to this information must be added to the original document. The
instrument can only be operated by trained personnel in accordance with these instructions and local
safety regulations.

Acceptable Operation

This instrument is intended only for the measurement of temperature. The instrument is appropriate
for continuous use. The instrument operates reliably in demanding conditions, such as in high
environmental temperatures, as long as the documented technical specifications for all instrument
components are adhered to. Compliance with the operating instructions is necessary to ensure the
expected results.

Unacceptable Operation

The instrument should not be used for medical diagnosis.

Replacement Parts and Accessories

Use only original parts and accessories approved by the manufacturer. The use of other products can
compromise the operation safety and functionality of the instrument.

Safety Instructions

Marathon MM Rev. D7 Jul 2017 11

Safety Symbols

AC (Alternating Current)

DC (Direct Current)

Risk of danger. Important information. See manual.

Hazardous voltage. Risk of electrical shock.

Helpful information regarding the optimal use of the instrument.
Earth ground

Protective ground

Fuse
Normally-open (NO) relay

Normally-closed (NC) relay
Switch or relay contact

DC power supply
Conforms to European Union directive.

Disposal of old instruments should be handled according to professional and
environmental regulations as electronic waste.

Safety Instructions

12 Rev. D7 Jul 2017 Marathon MM

To prevent possible electrical shock, fire, or personal injury follow these guidelines:

 Read all safety Information before you use the product.
 Use the product only as specified, or the protection supplied by the product can be

compromised.

 Carefully read all instructions.
 Do not use and disable the product if it is damaged.
 Do not use the product if it operates incorrectly.
 Do not look directly into the laser with optical tools (for example, binoculars, telescopes,

microscopes). Optical tools can focus the laser and be dangerous to the eye.

 Do not look into the laser. Do not point laser directly at persons or animals or indirectly off

reflective surfaces.

 Do not use laser viewing glasses as laser protection glasses. Laser viewing glasses are used

only for better visibility of the laser in bright light.

 Use the product only as specified or hazardous laser radiation exposure can occur.

Product Description

Marathon MM Rev. D7 Jul 2017 13

2 Product Description

The Marathon MM is a multi-purpose, high performance single color infrared pyrometer with an
extensive feature set, rugged industrial housing and a high level of functionality. The sensor is available
in different spectral responses to accommodate the wide range of industrial applications requiring non­contact temperature measurement. It is intended to be simple to operate, with a user-friendly interface
and well suited to a wide variety of industrial applications.

Each sensor has a rugged stainless steel housing, a rear membrane panel with backlit LCD display, and
a standard through the lens sighting with optional laser target sighting. Alternative to the laser sighting,
a video sighting is offered as an option. The Marathon MM is also available with remotely adjustable
precision focus optics. Users can easily adjust the focus of measurement targets, either by push-button
on the rear of the instrument, or remotely via the RS232/RS485 connection from a PC.

Each model operates as a temperature measurement subsystem consisting of optical elements, spectral
filters, detector, and digital electronics. All components are water-tight NEMA-4 (IP65, IEC529) rated
and are built to operate on a 100 percent duty cycle in industrial environments. Simultaneous analog
and digital outputs consist of standardized signals commonly available for use with computers,
controllers, recorders, alarms, or A/D interfaces.

Technical Data

14 Rev. D7 Jul 2017 Marathon MM

3 Technical Data

3.1 Measurement Specifications

Temperature Range

LT -40 to 800°C (-40 to 1472°F)

G7 300 to 900°C (572 to 1652°F)

G5L 250 to 1650°C (482 to 3002°F)

G5H 450 to 2250°C (842 to 4082°F)

MT 250 to 1100°C (482 to 2012°F)

3M 100 to 600°C (212 to 1112°F)

2ML 300 to 1100°C (572 to 2012°F)

2MH 450 to 2250°C (842 to 4082°F)

1ML 400 to 1740°C (752 to 3164°F)

1MH 540 to 3000°C (1004 to 5432°F)

Measurements at the low end of the temperature range for the 1M models can be
effected by disturbing day light!

Spectral Response

LT 8 to 14 µm
G7 7.9 µm
G5 5 µm
MT 3.9 µm
3M 2.1 to 2.5 µm
2M 1.6 µm
1M 1 µm

Response Time (95%)

LT, MT, G7 120 ms
G5 60 ms
3M 20 ms
1M, 2M 2 ms

Exposure Time1 (95%)

1M, 2M 1 ms

1

The exposure time is the minimum time during which the measured object must be present. The output value of the sensor

can be delayed. (VDI/VDE 3511)

Technical Data

Marathon MM Rev. D7 Jul 2017 15

System Accuracy2

LT ± 1% of reading or ± 1°C for Tmeas > 0°C (32°F)

(whichever is greater)

MT ± 1% of reading for Tmeas > 350°C (662°F)

± 2°C or ± 2% for Tmeas < 350°C (662°F)

(whichever is greater)

G5L, G5H, G7 ± 1% of reading

3M ± 1% of reading for Tmeas > 150°C (302°F)

± 5°C for Tmeas < 150°C (302°F)

2ML ± (0.3% of reading + 2°C)

2MH ± (0.3% of reading + 1°C)

1ML ± (0.3% of reading + 1°C) for Tmeas > 450°C (842°F)

± (2% of reading + 2°C) for Tmeas < 450°C (842°F)

1MH ± (0.3% of reading + 1°C) for Tmeas > 650°C (1202°F)

± (2% of reading + 2°C) for Tmeas < 650°C (1202°F)

Repeatability3

LT, MT, G5, 3M, G7 ± 0.5% of reading or ± 0.5°C, whichever is greater
2ML, 2MH ± (0.1% of reading + 1°C)
1ML ± (0.1% of reading + 1°C) for Tmeas > 450°C (842°F)

± (1% of reading + 1°C) for Tmeas < 450°C (842°F)

1MH ± (0.1% of reading + 1°C) for Tmeas > 650°C (1202°F)

± (1% of reading + 1°C) for Tmeas < 650°C (1202°F)

Temperature Resolution (mA output)

2MH, 1MH 0.2 K
all other models 0.1 K

Noise Equivalent Temperature (NETD)

LT 0.1 K at Tobj = 23°C (73°F), Tamb = 23°C (74°F)
3M 0.1 K at Tobj = 200°C (392°F), Tamb = 25°C (77°F)
MT, G5, G7 0.5 K at Tobj = 10% of full measurement range, Tamb = 25°C (77°F)
2M, 1M 0.5 K at Tobj = 10% of full measurement range, Tamb = 25°C (77°F)

Response time = Instrument Response time

Emissivity 0.100 to 1.150, in 0.001 increments

Signal Processing Peak hold, valley hold, averaging, advanced peak hold,

advanced valley hold, ambient background temperature
compensation

2

at 23°C ±5°C (73°F ±9°F), emissivity = 1.0, and time response 1.0 s

3

at 23°C ±5°C (73°F ±9°F)

Technical Data

16 Rev. D7 Jul 2017 Marathon MM

3.2 Optical Specifications

In all cases, make sure the target completely fills the measurement spot, see section 6.1.1 Distance to

Object, page 26.

The actual spot size for any distance, when the unit is at focus distance, can be calculated by using the

following formula. Divide the distance D by your model’s D:S number. For example, for a unit with D:S

= 300:1, if the sensor is 2200 mm (86 in.) from the target, divide 2200 by 300 (86 by 300), which gives you
a target spot size of approximately 7.3 mm (0.29 in.).

Figure 1: Spot Size Chart

All target spot sizes indicated in the optical diagrams are based on 90% energy.

3.2.1 Variable Focus

Model

Focus

Focus Range

Optical

Resolution D:S *

Smallest Spot Size

LT, MT, G5, 3M

VF1

200 mm (7.9 in.) to 2200 mm (86.6 in.)

70:1

2.9 mm @ 200 mm
(0.11 in. @ 7.9 in.)

G7

VF1

200 mm (7.9 in.) to 2200 mm (86.6 in.)

100:1

2 mm @ 200 mm

(0.08 in. @ 7.9 in.)

1ML, 2ML

VF1

300 mm (11.8 in.) to 2200 mm (86.6 in.)

160:1

1.9 mm @ 300 mm

(0.07 in. @ 11.8 in.)

1MH, 2MH

VF1

300 mm (11.8 in.) to 2200 mm (86.6 in.)

300:1

1 mm @ 300 mm

(0.04 in. @ 11.8 in.)

* Optical Resolution is achieved for each focal point in the focus range

Mean Time Between Failures (MTBF) 10,000 operations (at Tamb = 23°C/74°F)

D = Distance
S = Spot size

Technical Data

Marathon MM Rev. D7 Jul 2017 17

3.2.2 Fixed Focus

Optical Resolution D:S

LT, MT, G5, 3M 70:1
G7 100:1

Available Optics

LT, MT, G5, 3M, G7 SF1, SF2, SF3
LT, 3M CF1

The focus distance is measured from the front end of the sensor. For units with
Air/Water Cooled Housing you have to subtract 34.5 mm (1.358 in) from the focus
distance. This is very important especially for sensors with close focus optic!

Technical Data

18 Rev. D7 Jul 2017 Marathon MM

SF … Standard Focus, CF … Close Focus
* specified D:S ratio at focus point only

Table 1: Optical Diagrams for D:S = 70:1

Technical Data

Marathon MM Rev. D7 Jul 2017 19

SF … Standard Focus, CF … Close Focus
* D:S = 100:1 at focus point

Table 3: Optical Diagrams for D:S = 100:1

Technical Data

20 Rev. D7 Jul 2017 Marathon MM

SF … Standard Focus, CF … Close Focus
* D:S = 160:1 at focus point

Table 2: Optical Diagrams for D:S = 160:1

Technical Data

Marathon MM Rev. D7 Jul 2017 21

SF … Standard Focus, CF … Close Focus
* D:S = 300:1 at focus point

Table 3: Optical Diagrams for D:S = 300:1

Technical Data

22 Rev. D7 Jul 2017 Marathon MM

3.3 Electrical Specifications

Power Supply 24 VDC ± 20%, min. 500 mA

Outputs

Analog 0 - 20 mA, 4 - 20 mA (active)

14 bit resolution
max. current loop impedance: 500 Ω

RS485 Interface networkable to 32 sensors

Baud rate: 300, 1200, 2400, 9600, 19200, 38400 (default), 57600,
115200
(max. 38400 Baud in 2-wire mode)
Data format: 8 bit, no parity, 1 stop bit,
4-wire mode (full-duplex) or 2-wire mode (half duplex),
selectable via control panel or software

Relay Contacts max. 48 V, 300 mA, response time < 2 ms,

(software programmable)

Display 5 digit backlit LCD display

External Input

Input Voltage 0 to 5 VDC

functions: trigger, laser ON/OFF switching, ambient
background temperature compensation, or emissivity setting,
see section 7.4.3 External Input page 44.

3.4 Environmental Specifications

Environmental rating NEMA-4 / IEC 529, IP 65 (also with video option)

Relative Humidity 10% to 95% non-condensing

Storage Temperature -20 to 70°C (-4 to 158°F)
Ambient Temperature 5 to 65°C (41 to 149°F) without cooling

with video 5 to 50°C (41 to 122°F) without cooling
with air cooling 10 to 120°C (50 to 250°F)
with water cooling 10 to 175°C (50 to 350°F)
with ThermoJacket 10 to 315°C (50 to 600°F) water cooled

Warm up Period 20 min.

Vibration MIL-STD-810D (IEC 68-2-6) 2 G, 10 - 150 Hz, 3 axis

Mechanical Shock MIL-STD-810D (IEC 68-2-27) 5 G, 11 ms duration, 3 axis

Weight 0.7 kg (1.54 lb)

Technical Data

Marathon MM Rev. D7 Jul 2017 23

3.5 Dimensions

Figure 2: Dimensions of Sensor

For the dimensional drawing of the Fixed Mounting Bracket, see section 9.2 Fixed Mounting Bracket,
page 57.

3.6 Scope of Delivery

The scope of delivery includes the following:

• Sensor with through-the-lens sighting

• Operating Instructions

• DataTemp Multidrop Software

• Mounting nut made from stainless steel (XXXMMACMN)

• Fixed mounting bracket made from stainless steel (XXXMMACFB)

Basics

24 Rev. D7 Jul 2017 Marathon MM

4 Basics

4.1 Measurement of Infrared Temperature

Everything emits an amount of infrared radiation according to its surface temperature. The intensity of
the infrared radiation changes according to the temperature of the object. Depending on the material
and surface properties, the emitted radiation lies in a wavelength spectrum of approximately 1 to 20

µm. The intensity of the infrared radiation (”heat radiation”) is dependent on the material. For many

substances this material-dependent constant is known. It is referred to as ”emissivity value”, see section

12.2 Typical Emissivity Values, page 84.
Infrared thermometers are optical-electronic sensors. These sensors are able to detect ”radiation of
heat”. Infrared thermometers are made up of a lens, a spectral filter, a sensor, and an electronic signal
processing unit. The task of the spectral filter is to select the wavelength spectrum of interest. The sensor
converts the infrared radiation into an electrical signal. The signal processing electronics analyze the
electrical signals and convert it into a temperature measurement. As the intensity of the emitted infrared
radiation is dependent on the material, the required emissivity can be selected on the sensor.
The biggest advantage of the infrared thermometer is its ability to measure temperature without
touching an object. Consequently, surface temperatures of moving or hard to reach objects can easily be
measured.

4.2 Emissivity of Target Object

Determine the emissivity of the target object as described in appendix 12.1 Determination of Emissivity,
page 84. If emissivity is low, measured results could be falsified by interfering infrared radiation from
background objects (such as heating systems, flames, fireclay bricks, etc. close beside or behind the
target object). This type of problem can occur when measuring reflecting surfaces and very thin
materials such as plastic films and glass.
This measuring error can be reduced to a minimum if particular care is taken during installation, and
the sensing head is shielded from these reflecting radiation sources.

Environment

Marathon MM Rev. D7 Jul 2017 25

5 Environment

Sensor location depends on the application. Before deciding on a location, you need to be aware of the
ambient temperature of the location, the atmospheric quality of the location, and the possible
electromagnetic interference in that location, according to the sections described above. If you plan to
use air purging, you need to have an air connection available. If you are installing the sensor in a
ThermoJacket accessory, you should use the appropriate mounting device. Also, wiring and conduit
runs must be considered, including computer wiring and connections, if used.

5.1 Ambient Temperature

The sensor is designed for measurements in ambient temperatures between 5°C and 65°C (41 to 149°F).
A water or air cooled housing is available as option to extend the operating range to 120°C (250°F) with
air cooling and to 175°C (350°F) with water cooling.
In ambient conditions up to 315°C (600°F), the ThermoJacket housing should be used. When using the
ThermoJacket, it is strongly recommended to use the supplied air purge to avoid condensation on the
lens.

5.2 Atmospheric Quality

If the lens gets too dirty, it cannot detect enough infrared energy to measure accurately. It is good
practice to always keep the lens clean. The air purge helps keep contaminants from building up on the
lens. If you use the air purge accessory, make sure a filtered air supply with clean dry air at the correct
air pressure is installed before proceeding with the sensor installation.

5.3 Electrical Interference

To minimize measurement errors due to electrical or electromagnetic interference or “noise” be aware
of the following:

 Mount the electronics enclosure as far away as possible from potential sources of electrical

interference such as motorized equipment producing large step load changes.

 Use shielded wire for all input and output connections.
 Make sure the shield wire from the electronics to terminal block cable is earth grounded.
 For additional protection, use conduit for the external connections. Solid conduit is better than

flexible conduit in high noise environments.

 Do not run AC power in the same conduit as the sensor signal wiring.

When installing the sensor, check for any high-intensity discharge lamps or heaters that
may be in the field of view (either background or reflected on a shiny target). Reflected
heat sources can cause a sensor to give erroneous readings.

Installation

26 Rev. D7 Jul 2017 Marathon MM

6 Installation

6.1 Mechanical Installation

After all preparations are complete, you can install the sensor. How and where you anchor the sensor
depends on the type of surface and the type of bracket you are using. You can mount the sensor through
a hole, on a bracket of your own design, or on the available bracket accessory.

6.1.1 Distance to Object

The desired spot size on the target will determine the maximum measurement distance and the
necessary focus length of the optical module. To avoid erroneous readings the target spot size must
contain the entire field of view of the sensor. Consequently, the sensor must be positioned so the field
of view is the same as or smaller than the desired target size. For a list indicating the available focus
models and their parameters, see section 3.2 Optical Specifications, page 16.

Figure 3: Proper Sensor Placement

6.1.2 Variable Focus

The optional variable focus allows adjustment of the focus length of the sensor optics. Using sensors
with this feature requires that the correct focal distance be set on the sensor. To determine the correct
focal distance for the sensor, measure the distance in millimeters from the face of the sensor to the target.
Set the focal distance to be equal to the measured distance. It is possible to set the focal distance either
on the control panel of the sensor or through the DataTemp Multidrop Software.
The factory default focal distance is 600 mm (23.6 in.).

Target greater than spot size

Target equal to spot size

Target smaller than spot size

best

critical

incorrect

Background

Sensor

Installation

Marathon MM Rev. D7 Jul 2017 27

6.1.3 Viewing Angles

The sensor head can be placed at any angle from the target up to 30°.

Figure 4: Acceptable Sensor Viewing Angles

Best

90° to target

Good

30° to 90° to target

Bad

0° to 30° to target

Acceptable

Angles

Installation

28 Rev. D7 Jul 2017 Marathon MM

6.2 Electrical Installation

The 12-wire connecting cable is used to wire all inputs and outputs of the sensor. The cable comes in
two different temperature versions. For more information, see section see section 9.9 Terminal Box,
page 62 and section 9.11 High Temp Cable, page 64.
The following figure shows how to configure the drain wires of the cables before connecting to the
sensor. The bare wire with the clear shrink tubing (cable shield) must be connected to the terminal
labeled CLEAR.

Figure 5: Sensor Connecting Cable with Terminal Block

The factory default setting for the Marathon MM is the 4-Wire Mode!

The complete wiring must have only one common earth ground point!

Power supplies based on a IT grid structure could cause an unintended reset of the
sensor. To avoid this, consider a sensor mounting isolated from the machinery!

To Sensor

Installation

Marathon MM Rev. D7 Jul 2017 29

Figure 6: DIN Connector Pin Layout (pin side)

Pin

Cable Color

Description

A

black

RxA* B white

RxB*

C

gray

TxB** D purple

TxA** E white/drain

Shield

F

yellow

Trigger / External Input

G

orange

Relay COM

H

blue

Relay NO/NC

J

green

+ mA out

K

brown

- mA out (analog ground)

L

black

Digital ground

M

red

+24 VDC

* RxA and RxB are twisted paired
** TxA and TxB are twisted paired

Table 4: DIN Connector Wiring

Incorrect wiring can damage the sensor and void the warranty. Before applying power,
make sure all connections are correct and secure!

To prevent possible electrical shock, fire, or personal injury make sure that the sensor
is grounded before use.

Installation

30 Rev. D7 Jul 2017 Marathon MM

6.3 Computer Interfacing

The distance between the sensor and a computer can be up to 1200 m (4000 ft.) via RS485 interface. This
allows ample distance from the harsh environment where the sensing system is mounted to a control
room or pulpit where the computer is located. The USB/RS485 Interface Converter allows you to connect
your sensor to computers by using a USB interface.
With auto configuration the converter is able to automatically configure RS485 signals without external
switch setting. The converter is equipped with 3000 VDC of isolation and internal surge-protection to
protect the host computer and the converter against high voltage spikes, as well as ground potential
difference. When the converter is connected the computer gets one virtual COM port.

Technical Data

Power supply 5 VDC direct from USB port

Speed max. 256 kBit/s

RS485 4 wire (full duplex) and 2 wire (half duplex)

Terminal screwed accepts 0.05 to 3 mm² (AWG 13 to AWG 30)

USB connector type B (supplied with type A to type B cable)

Ambient Temperature 0 to 60°C (32 to 140°F), 10-90% relative humidity, non-condensing

Storage Temperature -20 to 70°C (-4 to 158°F), 10-90% relative humidity, non-condensing

Dimensions (L x W x H) 151 x 75 x 26 mm (5.9 x 2.9 x 1 in)

Figure 7: USB/RS485 Converter (XXXUSB485)

Using the 2-wire communication reduces wiring cost in comparison to the 4-wire communications. The
disadvantage is, that because the data transfer can be only in one direction at the same time, 2-wire
communications have a maximum baud rate of 38.4 kBaud. 2-wire communications is available for
network installations, in situations where other sensors are only able to communicate via 2 wires(e.g.
MI3 sensor).

The factory default setting for the Marathon MM is the 4-Wire Mode!

Installation

Marathon MM Rev. D7 Jul 2017 31

Figure 8: Wiring the Sensor’s RS485 Interface with USB/RS485 Converter

in 4-Wire Mode (factory default)

Figure 9: Wiring the Sensor’s RS485 Interface with USB/RS485 Converter

in 2-Wire Mode

Converter

Sensor

Converter

Sensor

Installation

32 Rev. D7 Jul 2017 Marathon MM

6.4 Multiple Sensors in a Network

6.4.1 Wiring

For an installation of two or more sensors in a network, each sensor cable is wired to its own terminal
block. The RS485 terminals on each terminal block are wired in parallel.
The following figures illustrate the wiring of sensors in a 4-wire and 2-wire multidrop installation.

Figure 10: 4-Wire Multidrop Wiring in a Network

Figure 11: 2-Wire Multidrop Wiring in a Network

USB/485

Interface Converter

XXXUSB485

Terminal Block

from Sensor

from additional terminal block
of another sensor

USB/485

Interface Converter

XXXUSB485

Terminal Block

from Sensor

from additional terminal block(s)
of other sensor(s)

Installation

Marathon MM Rev. D7 Jul 2017 33

6.4.2 Addressing

The addressing of a sensor can be done by means of the Control Panel on the back of the sensor or the
DataTemp Multidrop Software (Menu <Sensor Setup>) that came with your sensor. An alternative
would be to use the specific interface commands of the sensor in conjunction with a standard terminal
program (e.g. Windows HyperTerminal), see section 10.12 Command List, page 78.
If you are installing two or more sensors in a multi-drop configuration, please be aware of the following:

 Each sensor must have a unique address greater zero.
 Each sensor must be set to the same baud rate.

6.4.3 Configuration Procedure

1. Attach each unit individually to the computer.

2. Start the DataTemp Multidrop Software.

3. In the DataTemp Multidrop Startup Wizard, select the correct COM port and ASCII protocol,

then <Scan All Baud Rates> for a <Single Sensor>. DataTemp Multidrop should find the single
MM unit connected to the computer serial port.

4. Once DataTemp Multidrop is running, go to the <Setup> menu and select <Sensor Setup>.

5. In the <Sensor Setup> menu select the <Advanced Setup> tab. This tab contains the

Communications Interface menu. The Interface Menu allows you to set the <Polling Address>,
<Baud Rate> and <RS485 Mode>. Each unit needs a unique address, but the same <Baud Rate>
and <RS485 Mode> settings.

6. Once all the units are addressed, wire up the units in the either the 2-wire or 4-wire multidrop

manner, keeping all TxA's, TxB's, RxA's and RxB's to be common.

7. Now you can run the DataTemp Multidrop Software and by selecting the baud rate that you

set, the program will quickly identify all of the units attached on the network and you're up and
running.

It is also possible to address each unit without the use of the DataTemp Multidrop Software. Once the
unit is powered up, use the enter and mode buttons on the back panel operator interface and toggle to
the Multidrop Address field, see section 7.2 Operation Modes, page 34. Use up and down buttons to
select a unique address for each unit. The units may now be installed in a multidrop network.

Operation

34 Rev. D7 Jul 2017 Marathon MM

7 Operation

Once you have the sensor positioned and connected properly, the system is ready for continuous
operation.
The operation of the sensor can be done by means of the built-in control panel in the sensor’s housing
or by means of the software that came with your sensor.

7.1 Control Panel

The sensor is equipped with a control panel in the sensor’s housing, which has setting/controlling
buttons and an LCD display. The panel is used primarily for setting up the instrument and is sealed
during operation. The buttons and the display are defined in the following sections.

Figure 12: Control Panel

The sensor has a user interface lockout feature that keeps the unit from being accidentally changed from
the control panel (locked by default in multidrop mode). This lockout mode denies access to all the
adjustable parameters on the control panel. Access to the display modes of the panel while in a locked
condition is provided.

7.2 Operation Modes

When you first turn the unit on, the display shows the current temperature. Pushing the keys of the
control panel will change the figures on the display as shown in the menu tree below.

Display

LED for

Laser Indication

Increase Value

Decrease Value

Next Mode

Previous Mode

Enter

Through-the-lens sighting

Operation

Marathon MM Rev. D7 Jul 2017 35

Figure 13: Operation Modes

Enter



<Ambient Temp.>

E <Emissivity>

◄ ►

T <Transmission>

◄ ►

◄ ►

A <Average>

◄ ►

P <Peak Hold>

V <Valley Hold>

◄ ►

L <Low mA>

◄ ►

M <Multidrop

◄ ►

B <Baud Rate>

◄ ►

◄ ►

◄ ►

▲

▼

0.100 to 1.150

▲

▼

0.100 to 1.000

▲

▼

On/Off/TRG

▲

▼

0.0 to 300.0

▲

▼

0.0 to 300.0

▲

▼

0.0 to 300.0

▲

▼

Low to High Temp

▲

▼

--, 1 to 32

U <Temp. Unit>

◄ ►

▲

▼

0.3, 1.2, 2.4, 9.6,

19.2, 38.4, 57.6,

115.2

▲

▼

°C, °F, K

Saving of the

selected parameter

Enter



Without saving a

parameter

no action

for 10 sec

COM <Com

◄ ►

▲

▼

2-wire/4-wire

CP <Control

◄ ►

▲

▼

Lock

H <High mA>

▲

▼

Low to High Temp

<Object Temp.>

◄ ►

F <Focus>

◄ ►

▲

▼

0.2/0.3 - 2.2

L<Laser> / V

In the event of displaying the object's
temperature and pressing the <Enter>
button again, the sensor will not run
through the complete menu again but
directly go to the menu which was last
used.

Operation

36 Rev. D7 Jul 2017 Marathon MM

Object Temp.: The display shows the current temperature of the measured object.

Ambient Temp.: The display shows the current internal temperature of the sensor.

Emissivity: Changes the emissivity value. The emissivity is a calculated ratio of infrared

energy emitted by an object to the energy emitted by a blackbody at the same
temperature (a perfect radiator has an emissivity of 1.00). For information
on determining an unknown emissivity and for sample emissivities, see
section 12.2 Typical Emissivity Values, page 84.

Transmission: Changes the transmission value when using protective windows. For

example, if a protective window is used with the sensor, set the transmission
to the appropriate value.

Focus: Changes the focus length of the sensor optics.

Laser/Video: Switches the laser or the video (if available) on or off. With the setting <TRG>

the laser can also be switched on/off via the external input.

Average: Parameter given in seconds. Once Average is set above 0.0, it automatically

activates. Note that other hold functions (like Peak Hold or Valley Hold)
cannot be used concurrently. The default value is 0.0.
For further information see section 7.3.1 Averaging, page 37.

Peak Hold: Parameter given in seconds. Once Peak Hold is set above 0.0, it

automatically activates. Note that other hold functions (like Valley Hold or
Averaging) cannot be used concurrently. The default value is 0.0.
For further information see section 7.3.2 Peak Hold, page 38.

Valley Hold: Parameter given in seconds. Once Valley Hold is set above 0.0, it

automatically activates. Note that other hold functions (like Peak Hold or
Averaging) cannot be used concurrently. The default value is 0.0.
For further information see section 7.3.4 Valley Hold, page 41.

Low mA: Defines the temperature for the low current output value (0 or 4 mA).

High mA: Defines the temperature for the high current output value (20 mA).

Multidrop Addr.: Defines the address of a sensor in a network. Each sensor in a network must

have a unique address. “--“ means a standalone unit with address 0.

Baud Rate: Defines the baud rate of a sensor. Each sensor in a multidrop network must

be set to the same baud rate.

Temp. Unit: The temperature display can be set to °C , °K or °F. Note that this setting

influences the RS485 output for both object and ambient temperature. The
default value is °C.

Com Mode: Selects the desired digital communication mode for the sensor, either 2-Wire

or 4-Wire.

Operation

Marathon MM Rev. D7 Jul 2017 37

Control Panel: The control panel can be locked to avoid accidentally change of sensor

operating parameters. Once locked the control panel must be unlocked by
using the control panel as follows:

1. Control Panel is locked.

2. Press the <> button to enter Control Panel menu.

3. Press the following buttons consecutively: <▲> <▼>

4. Control Panel is unlocked.

Note that the control panel is locked by default in multidrop mode and can
also be unlocked through the DataTemp Multidrop Software or a
programming command.

7.3 Signal Processing

Activating and adjusting the parameters for the signal processing is accomplished either through the
DataTemp Multidrop Software, or the programming commands, or partially on the control panel.

7.3.1 Averaging

Averaging can be useful when an average temperature over a specific duration is desired, or when a
smoothing of fluctuating temperatures is required. The signal is smoothed depending on the defined
time basis. In other words, the output signal tracks the detector signal with significant time delay but
noise and short peaks are damped. Use a longer average time for more accurate damping behavior. The
average time is the amount of time the output signal needs to reach 90% magnitude of an object
temperature jump. The following figure illustrates an averaging output signal.
This function is set on the control panel, the software or by means of the programming command G.

Figure 14: Averaging

output temperature

object temperature

temperature jump

average time

90% of
temperature jump

Time

Temp

Operation

38 Rev. D7 Jul 2017 Marathon MM

7.3.2 Peak Hold

With Peak Hold, the respective last peak value is held until the next reset will occur. There are the
following possibilities for a reset.

7.3.2.1 Reset

 Reset by Time: The peak will be held for a certain hold time. Once the hold time is exceeded

the output signal, tracks and output the actual object temperature and the algorithm will start
over again. This function is set on the control panel, the software or by means of the
programming command <P>.

Figure 15: Peak Hold reset by Time

 Reset by Trigger: A logical low signal for the trigger will reset the peak hold function. As long

as the input is kept at logical low level the actual object temperatures will be transferred toward
the output. At the next logical high level, the hold function will be restarted.
To activate the reset by trigger function, the Peak Hold must be set to 300.0 either through the
control panel, or DataTemp Multidrop Software, or the programming commands <P>. For
wiring the external trigger, see section 7.4.3.1 Trigger, page 44.

Figure 16: Peak Hold reset by Trigger

output temperature

object temperature

hold time

hold time

Time

Temp

output temperature

object temperature

Time

Temp

Trigger

Operation

Marathon MM Rev. D7 Jul 2017 39

 Reset by burst string (Burst Peak Hold): In burst mode, the peak will be held until a new burst

string is being sent via the digital interface, so the effective peak hold time is defined as the
time difference between two sent burst strings.
In the poll mode, there is a dedicated peak hold time set to <BS> + 10 ms whereby <BS> is the
parameter for the burst speed.
This function Burst Peak Hold is activated by means of the programming command <BP=1>
and resets the commands <F>, <G>, and <P>.

Figure 17: Peak Hold reset by sent Burst String

Peak Hold time equal to burst speed <BS>

7.3.2.2 Signal Slope

Here are the following options to define the lapse for the signal slope in case of a reset.

 Signal slope defined by perpendicular drop (default)

Figure 18: Perpendicular Signal Slope

 Signal slope defined by a linear decay: the decay is given in the Kelvin/second. This parameter

is set by means of the programming command <XE>.

output temperature

object temperature
Temp

Time

Output temperatures

object temperature

<BS>

Time

Temp

<BS>

<BS>

<BS>

<BS>

Operation

40 Rev. D7 Jul 2017 Marathon MM

Figure 19: Signal Slope defined by Decay

 Signal slope defined by an average time. The average time is the amount of time the output

signal needs to reach 90% magnitude compared to a perpendicular drop. This parameter is set
by means of the programming command <AA>.

Figure 20: Averaging the Signal Slope

7.3.3 Advanced Peak Hold

This function searches the sensor signal for a local peak and writes this value to the output until a new
local peak is found. Before the algorithm restarts searching for a local peak, the object temperature has
to drop below a predefined threshold. If the object temperature raises above the held value which has
been written to the output so far, the output signal follows the object temperature again. If the algorithm
detects a local peak while the object temperature is currently below the predefined threshold the output
signal jumps to the new maximum temperature of this local peak. Once the actual temperature has
passed a peak above a certain magnitude, a new local peak is found. This magnitude is called hysteresis.
The threshold is set by means of the programming command <C>, for hysteresis use the command <XY>.

output temperature

object temperature
Temp

Time

output temperature

object temperature
Temp

Time

Operation

Marathon MM Rev. D7 Jul 2017 41

Figure 21: Advanced Peak Hold

For the advanced peak hold function, there are the same settings for reset and signal slope available like
for the peak hold function, see sections 7.3.2.1 Reset, page 38 and 7.3.2.2 Signal Slope, page 39.

7.3.4 Valley Hold

This function works similar to the peak hold function, except it will search the signal for a minimum.

7.3.5 Advanced Valley Hold

This function works similar to the advanced peak hold function, except it will search the signal for a
local minimum.

output temperature

object temperature

hysteresis

threshold

Temp

Time

Operation

42 Rev. D7 Jul 2017 Marathon MM

7.4 Inputs and Outputs

7.4.1 Milliamp Output

The milliamp output is an analog output you can connect directly to a recording device (e.g., chart
recorder), PLC, or controller. The mA output can be forced to a specific value through the DataTemp
Multidrop software or a programming command according to section 10.9.1 Current Output, page 75.
This feature is useful for testing or calibrating connected equipment.

Figure 22: Wiring the Terminal

7.4.2 Relay Output

The relay output is used as an alarm for failsafe conditions, see section 11.2 Fail-Safe Operation, page 82,
or as a threshold relay. Relay output relates to the currently displayed temperature on the control panel
display. The relay output can be used to indicate an alarm state or to control external actions. The relay
contacts can be set either to N.C. (normally closed: relay contacts are closed while in the home position)
or N.O. (normally open: relay contacts are open while in the home position). The relay can also be forced
on or off for testing connected equipment through the DataTemp Multidrop software or a programming
command, see section 10.9.2 Relay Output, page 75.

7.4.2.1 Thresholds

The relay output has two user selectable thresholds. The two thresholds are set by default to the bottom
temperature range. Activating and adjusting the threshold value is accomplished through the
DataTemp Multidrop Software. Once one or both thresholds are activated the relay changes state as the
current measured temperature passes the threshold temperature.

Shield

to Sensor

Operation

Marathon MM Rev. D7 Jul 2017 43

Figure 23: Relay Output Example

7.4.2.2 Deadband

Deadband is a zone of flexibility around the threshold. The alarm does not go abnormal until the
temperature exceeds the threshold value by the number of set deadband degrees. Thereafter, it does not
go normal until the temperature is below the threshold by the number of set deadband degrees. The
deadband is factory preset to ±2 K of threshold value. Adjusting to other values is accomplished through
DataTemp Multidrop Software. For information on the sensor’s communication protocols, see section
10 Programming Guide, page 67.

High Threshold

Deadband

Low Threshold

Deadband

Relay Output

Object Temperature

Time

Object Temperature

Operation

44 Rev. D7 Jul 2017 Marathon MM

7.4.3 External Input

The external input can be used to provide the following functions:

 digital input for triggering
 digital input for On/Off switching of the laser
 analog input for compensating the ambient background temperature
 analog input for setting the emissivity

Only one input function can be active at a given time. Before changing to another input
function (e.g. remote emissivity setting) the currently set function (e.g. ambient
background compensation) needs to be switched off explicitly!

See the DataTemp Multidrop Software help for set up instructions, or refer to the required parameter
commands in section 10.9.3 External Input, page 76.

Figure 24: Digital (left) and Analog (right) Using of External Input

7.4.3.1 Trigger

The trigger is activated by shorting the external input to digital ground (pin GROUND on the terminal
block) for a minimum duration pulse of 10 ms. That can be done with an external switch, relay,
transistor, or TTL gate.

Sensor

Sensor

TRIGGER

Analog ground

(pin –mA OUT)

TRIGGER

Digital ground

(pin GROUND)

Operation

Marathon MM Rev. D7 Jul 2017 45

7.4.3.2 Ambient Background Temperature Compensation

The sensor is capable of improving the accuracy of target temperature measurements by taking into
account the ambient or background temperature. This feature is useful when the target emissivity is
below 1.0 and the background temperature is not significantly lower than the target temperature. For
instance, the higher temperature of a furnace wall could lead to too-high temperatures being measured
especially for lower emissivity targets. A built in ambient background temperature compensation utility
compensates for the impact of the reflected radiation in accordance to the reflective behavior of the
target. Due to the surface structure of the target, some amount of ambient radiation will be reflected
and therefore added to the thermal radiation that is collected by the sensor. The ambient background
temperature compensation compensates the final result by subtracting the amount of ambient radiation
measured from the sum of thermal radiation the sensor is exposed to.

The ambient background temperature compensation should always be activated in case
of lower emissivity targets in conjunction with targets cooler than the surrounding
environment or heat sources near to the target!

Three possibilities for ambient background temperature compensation are available:

 The internal sensor temperature is utilized for compensation assuming that the ambient

background temperature is more or less represented by the internal sensor temperature. This is
the default setting.

 If the background ambient temperature is known and constant, the user may input the known

ambient temperature as a constant temperature value.

 Ambient background temperature compensation from a second temperature sensor (infrared

or contact sensor) ensures extremely accurate results. An analog voltage signal at the external
input (0 to 5 VDC) is utilized for real time compensation. The voltage input signal is wired to
the trigger input terminal of the Marathon terminal block. If an infrared temperature sensor is
used for background compensation, both sensors must be set on the same temperature range.

Operation

46 Rev. D7 Jul 2017 Marathon MM

All ambient background temperature compensation functions are enabled through the DataTemp
Multidrop software, see the software help for set up instructions, or refer to the required command
protocol in section 10.8.6 Ambient Background Temperature Compensation, page 74.

Figure 25: Ambient Background Temperature Compensation with Second Infrared Sensor

Sensor 2

targeted

to ambient

Sensor 1

targeted

to object

Thermal radiation
of ambient

Thermal radiation
of target

0 – 5 VDC analog signal at external

input for ambient compensation

Furnace wall

Target object

Operation

Marathon MM Rev. D7 Jul 2017 47

7.4.3.3 Emissivity Setting

The external input (trigger input) can be configured to accept an analog voltage signal (0 to 5 VDC) to
provide real time emissivity setting. This function is enabled through the DataTemp Multidrop
Software, see the software help for set up instructions, or refer to the required command protocol in
section 10.8.5 Emissivity Setting, page 74. The following table shows the relationship between input
voltage and emissivity.

U in V

0.00

0.24

0.48

0.71

0.95

1.19

1.43

1.67

1.90

2.14

2.38

2.62

2.86

3.10

3.33

3.57

3.81

4.05

4.29

4.52

4.76

5.00

Emissivity

0.10

0.15

0.20

0.25

0.30

0.35

0.40

0.45

0.50

0.55

0.60

0.65

0.70

0.75

0.80

0.85

0.90

0.95

1.00

1.05

1.10

1.15

Table 5: Ratio between Analog Input Voltage and Emissivity

Figure 26: Adjustment of Emissivity at External Input (Example)

To the external input (trigger
input) of the sensor

position “product 1”

position “product 2”

3.1 V (ε=0.75)

1.9 V (ε=0.5)

Operation

48 Rev. D7 Jul 2017 Marathon MM

7.5 Factory Defaults

The following table provides the values in case of a factory default. The factory default can only be
initiated by using the DataTemp Multidrop Software. The Multidrop address and the baud rate will not
change from the last value when factory default is done.

Parameter

Factory defaults

Display mode

°C, TEMP- Display

Emissivity

0.95

Transmission

1.00

Focus

600 mm (23.6 in.)

Laser

Off

Average

000.0 (off)

Peak Hold

000.0 (off)

Valley Hold

000.0 (off)

Low mA (4 mA)

Minimum temperature of range

High mA (20 mA)

Maximum temperature of range

Multidrop Address

not changed (0 with delivery)

Baud Rate

not changed (38400 with delivery)

Temperature Unit

°C

Relay alarm output

controlled by unit

Current Output

4 – 20 mA

Control Panel

unlocked

Serial Communication

4-wire

RS485 Transfer Mode

Poll mode

Output String (RS485)

UTEIEC = temperature unit, target temperature,
emissivity, internal temperature, error code

Figure 27: Factory Defaults

Options

Marathon MM Rev. D7 Jul 2017 49

8 Options

Options are items that are factory installed and must be specified at time of order. The following are
available:

• Laser Sighting (…L) or Video Sighting (…V)

• Air/Water Cooled Housing including air purge

• Manufacturer's Calibration Certificate based on certified probes traced on national standards, e.g.

DAkkS (XXXMMCERT)

• Variable Focus (…VF1), see section 3.2.1 Variable Focus, page 16

8.1 Laser Sighting

The laser sighting allows fast and precise aiming at small, rapidly moving targets, or targets passing at
irregular intervals. The laser is specially aligned with the sensor’s lens to provide accurate, non-parallax
pinpointing of targets. The laser comes as a small, bright red spot indicating the center of the area being
measured.

Figure 28: Spot Size Indication

For activating the laser sighting see Figure 13: Operation Modes on page 35.

The laser is a Class II, AlGaInP type laser with an output power less than 1 mW, and an output
wavelength of 650 nm. The laser complies with FDA Radiation Performance Standards, 21CFR,
subchapter J, and meets IEC 825, Class 2 specifications.

To preserve laser longevity, the laser automatically turns off after approximately
10 minutes of constant use!

WARNING!
Avoid exposure to laser light! Eye damage can result.
Use extreme caution when operating!
Never point at another person!

Laser dot

Spot marker

Measured spot at the inner of the circle

Options

50 Rev. D7 Jul 2017 Marathon MM

8.2 Video Sighting

The Marathon MM unit has optional video sighting. Video sighting is intended as a convenient way to
verify correct sighting of the Marathon MM unit. Video sighting also allows for either video or frame
capture of the process, enhancing process documentation.

Video Specifications:
Pixels: 510 x 492
Field of View 8°
Focus equal the focal distance of the IR channel

(for units with fixed and variable focus)
Composite Video Output Format: NTSC (analog)
Signal – Noise Ratio: 40 dB
Fixed Noise: 0.03% Vpp
Ambient Temperature Range: 5 to 50°C (41 to 122°F)
Minimum Required Illumination: 5 Lux
Impedance: 75 
Cable Connection Type: BNC
Maximum Analog Video Cable Run: 100 m (328 ft.)

The video sighting option is integral to the sensor electronics, so no additional installation is required.
The unit utilizes an industry-standard BNC connector for the video output.

Figure 29: Wiring the Video Output

Analog Display Monitors

The analog NTSC video output can be feed directly to any monitor that accepts this video format. If
NTSC video monitors are not locally available, there are commercially available devices that convert
NTSC format into PAL or SECAM formats.

Manufacturer

supplied cable

(2 m / 6.6 ft.)

Female BNC

Connector

Male BNC

Connector

Male BNC
Connector

Connection to Video devices, e.g.:

 Analog Display Monitors
 Analog to Digital Video converters

 Analog Format converters

Options

Marathon MM Rev. D7 Jul 2017 51

Digital Video

In order to utilize the frame capture functionality of the MultiDrop Software, the analog video signal
must be converted into a digital signal imported via a USB port to the MultiDrop Software. The USB
port on the PC must fulfill at least the USB 2.0 specification!
An analog to digital video converter must be purchased locally. As a suitable converter is the
TERRATEC G3.

Consider the operating instructions for the selected converter!

In case of installation problems it is recommended to deactivate possible other video
devices via the control panel of the PC temporally!

Once converted and imported to a PC, the Video Icon in the MultiDrop Software’s toolbar automatically
detects and displays the video stream.

Figure 30: Video Icon in the MultiDrop Software

The video image window can be formatted in the <Setup Video View> window. This window can be
opened by right clicking on the default video image window.

Figure 31: Formatting the Video Image

The <Auto Save> tab in the <Setup Video View> window is used to define the parameters for video
frame capture and file path.

Select the video device

You can only see the video device for a PC

connected converter!

The list specifies multiple video devices

alphabetically.

The DataTemp MultiDrop software does not save
the selection of a video device. A restart of the
software requires, if necessary, the re-selection of

the desired video device!

Options

52 Rev. D7 Jul 2017 Marathon MM

Figure 32: Setting the <Auto Save> function

Options

Marathon MM Rev. D7 Jul 2017 53

8.3 Air/Water Cooled Housing

The Air/Water Cooled Housing allows the sensor to be used in ambient temperatures up to 120°C
(250°F) with air cooling, and 175°C (350°F) with water cooling. The cooling media should be connected
using 1/8” NPT stainless steel fittings requiring 6 mm (0.24 in) inner diameter and 8 mm (0.31 in) outer
diameter for the tube.
Air flow should be 1.4 to 2.5 l/sec at 25°C (77°F). Water flow should be approximately 1.0 to 2.0 l/min
(water temperature between 10 and 27°C / 50 to 80.6°F). The maximal pressure limit is 5 bar (73 PSI).
Chilled water below 10°C (50°F) is not recommended, see section 8.3.1 Avoidance of Condensation,
page 54.

The Air/Water Cooled Housing is delivered with appropriate fittings.

Figure 33: Air/Water Cooled Housing

For ambient temperatures exceeding 175°C (350°F), the ThermoJacket can be used. This
accessory allows operation at ambient temperatures up to 315°C (600°F)!

Options

54 Rev. D7 Jul 2017 Marathon MM

8.3.1 Avoidance of Condensation

If environmental conditions makes water cooling necessary, it is strictly recommended to check whether
condensation will be a real problem or not. Water cooling also causes a cooling of the air in the inner
part of the sensor, thereby decreasing the capability of the air to hold water. The relative humidity
increases and can reach 100% very quickly. In case of a further cooling, the surplus water vapor will
condense out as water. The water will condense on the lenses and the electronics resulting in possible
damage to the sensor. Condensation can even happen on an IP65 sealed housing.

There is no warranty repair possible in case of condensation within the housing!

To avoid condensation, the temperature of the cooling media and the flow rate must be selected to
ensure a minimum device temperature. The minimum sensor temperature depends on the ambient
temperature and the relative humidity. Please consider the following table.

Relative Humidity [%]

Ambient Temperature [°C/°F]

10

15

20

25

30

35

40

45

50

55

60

65

70

75

80

85

90

95

100

0/

32

0/

32

0/

32

0/

32

0/

32

0/

32

0/

32

0/

32

0/

32

0/

32

0/

32

0/

32

0/

32

0/

32

0/

32

0/

32

0/

32

0/

32

0/

32

0/

32

5/

41

0/

32

0/

32

0/

32

0/

32

0/

32

0/

32

0/

32

0/

32

0/

32

0/

32

0/

32

0/

32

0/

32

0/

32

0/

32

0/

32

0/

32

0/

32

5/

41

10/

50

0/

32

0/

32

0/

32

0/

32

0/

32

0/

32

0/

32

0/

32

0/

32

0/

32

0/

32

0/

32

0/

32

5/

41

5/

41

5/

41

5/

41

5/

41

10/

50

15/

59

0/

32

0/

32

0/

32

0/

32

0/

32

0/

32

0/

32

0/

32

0/

32

5/

41

5/

41

5/

41

5/

41

10/

50

10/

50

10/

50

10/

50

10/

50

15/

59

20/

68

0/

32

0/

32

0/

32

0/

32

0/

32

0/

32

5/

41

5/

41

5/

41

10/

50

10/

50

10/

50

10/

50

15/

59

15/

59

15/

59

15/

59

15/

59

20/

68

25/

77

0/

32

0/

32

0/

32

0/

32

5/

41

5/

41

10/

50

10/

50

10/

50

10/

50

15/

59

15/

59

15/

59

20/

68

20/

68

20/

68

20/

68

20/

68

25/

77

30/

86

0/

32

0/

32

0/

32

5/

41

5/

41

10/

50

10/

50

15/

59

15/

59

15/

59

20/

68

20/

68

20/

68

20/

68

25/

77

25/

77

25/

77

25/

77

30/

86

35/

95

0/

32

0/

32

5/

41

10/

50

10/

50

15/

59

15/

59

20/

68

20/

68

20/

68

25/

77

25/

77

25/

77

25/

77

30/

86

30/

86

30/

86

30/

86

35/

95

40/

104

0/

32

5/

41

10/

50

10/

50

15/

59

20/

68

20/

68

20/

68

25/

77

25/

77

25/

77

30/

86

30/

86

30/

86

35/

95

35/

95

35/

95

35/

95

40/

104

45/

113

0/

32

10/

50

15/

59

15/

59

20/

68

25/

77

25/

77

25/

77

30/

86

30/

86

35/

95

35/

95

35/

95

35/

95

40/

104

40/

104

40/

104

40/

104

45/

113

50/

122

5/

41

10/

50

15/

59

20/

68

25/

77

25/

77

30/

86

30/

86

35/

95

35/

95

35/

95

40/

104

40/

104

40/

104

45/

113

45/

113

45/

113

45/

113

50/

122

60/

140

15/

59

20/

68

25/

77

30/

86

30/

86

35/

95

40/

104

40/

104

40/

104

45/

113

45/

113

50/

122

50/

122

50/

122

50/

122

50/

122

50/

122

50/

122

60/

140

70/

158

20/

68

25/

77

35/

95

35/

95

40/

104

45/

113

45/

113

50/

122

50/

122

50/

122

50/

122

50/

122

60/

140

60/

140

60/

140

60/

140

60/

140

60/

140

80/

176

25/

77

35/

95

40/

104

45/

113

50/

122

50/

122

50/

122

60/

140

60/

140

60/

140

60/

140

60/

140

90/

194

35/

95

40/

104

50/

122

50/

122

50/

122

60/

140

60/

140

60/

140

100/
212

40/

104

50/

122

50/

122

60/

140

60/

140

Tab. 6: Minimum device temperatures [°C/°F]

Temperatures higher than 60°C
(140°F) are not recommended due to
the temperature limitation of the
sensor.

Example:

Ambient temperature = 50 °C
Relative humidity = 40 %
Minimum device temperature = 30 °C

The use of lower temperatures is at your own risk!

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Marathon MM Rev. D7 Jul 2017 55

9 Accessories

9.1 Overview

Accessories include items that may be ordered at any time and added on-site.

 Fixed Mounting Bracket (XXXMMACFB)
 Adjustable Mounting Bracket (XXXMMACAB)
 Air Purge Collar (XXXMMACAP...)
 Sight Tube (XXXTST…)
 Pipe Thread Adapter (XXXMMACPA)
 Right Angle Mirror (XXXMMACRA...)
 USB/RS485 Converter (XXXUSB485) see section 6.3 Computer Interfacing, page 30.
 Industrial Power Supply (XXXSYSPS)
 Terminal Box (RAYMAPB)
 Low Temp Cable with Terminal Block(XXX2CLTCB…)
 High Temp Cable with Terminal Block(XXX2CCB…)
 Terminal Block (XXXMATB)
 Terminal Box with terminal block and power supply (RAYMAPB)
 Protective Window (XXXMMACTW…)
 ThermoJacket (RAYTXXTJ4)
 {reserved}
 {reserved}

Accessories

56 Rev. D7 Jul 2017 Marathon MM

Figure 34: Accessories

Sensor

Adjustable Mounting Bracket

XXXMMACAB

Air Purge Collar
XXXMMACAP...

Sight Tube
XXXTST…

Fixed Mounting Bracket

XXXMMACFB

Pipe Adapter

XXXMMACPA

Pipe Adapter

XXXMMACPA

Protection Window
XXXMMACTW…

Mounting Nut
XXXMMACMN

Adjustable Pipe Adapter

XXXTXXAPA

ThermoJacket

RAYTXXTJ4

Right Angle Mirror
XXXMMACRA...

Accessories

Marathon MM Rev. D7 Jul 2017 57

9.2 Fixed Mounting Bracket

Figure 3: Fixed Mounting Bracket in Stainless Steel (XXXMMACFB)

9.3 Adjustable Mounting Bracket

Figure 35: Adjustable Mounting Bracket in Stainless Steel (XXXMMACAB)

Accessories

58 Rev. D7 Jul 2017 Marathon MM

9.4 Air Purge Collar

The Air Purge Collar accessory is used to keep dust, moisture, airborne particles, and vapors away from

the optical head’s lens. It can be installed before or after the bracket. It must be screwed in fully. Air
flows into the 1/8” NPT fitting and out the front aperture. Air flow should be a maximum of 0.5 - 1.5

liters/sec (1 - 3 cfm). Clean (filtered) or “instrument” air is recommended to avoid contaminants from
settling on the lens. Do not use chilled air below 10°C (50°F).
The air purge collar can only be used either with the sensor alone or with the Air/Water Cooled Housing.
The Air Purge Collar is rotatable in steps of 120°.
The Air Purge Collar is available in Aluminum (XXXMMACAP) or stainless steel (XXXMMACAPS).

Figure 36: Air Purge Collar

9.5 Sight Tube

Use a protection tube in temperature measurement environments where reflected energy is a problem.

 Stainless Steel Protection Tube up to 800°C (1472°F) (XXXTST12)
 Ceramic (Alumina) Protection Tube up to 1500°C (2732°F) (XXXTSTC12)

When using a customer supplied protection tube, use caution in specifying the inside
diameter and length. Your sensing head determines what diameter/length
combinations are possible without impeding the optical field of view!

Figure 37: Sight Tube

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Marathon MM Rev. D7 Jul 2017 59

9.6 Pipe Thread Adapter

The pipe thread adapter must be used to connect the sight tube with the sensor housing. It is made from
stainless steel.

Figure 38: Pipe Adapter (XXXMMACPA)

Figure 39: Sensor with Sight Tube (XXXTST…) Pipe Adapter (XXXMMACPA),

and Fixed Mounting Bracket (XXXMMACFB)

Sensor

Accessories

60 Rev. D7 Jul 2017 Marathon MM

9.7 Right Angle Mirror

The Right Angle Mirror is used to turn the field of view by 90° against the sensor axis. It is recommended
when space limitations or excessive radiation do not allow to directly align the sensor to the target. In
dusty or contaminated environments, the air purging should be used to keep the mirror surface clean.
The right angle mirror is available in Aluminum (XXXMMACRA) or stainless steel (XXXMMACRAS).

Figure 40: Right Angle Mirror

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Marathon MM Rev. D7 Jul 2017 61

9.8 Industrial Power Supply

The DIN-rail mount industrial power supply delivers isolated dc power and provides short circuit and
overload protection.

To prevent electrical shocks, the power supply must be used in protected environments
(cabinets)!

Technical data:

Protection class prepared for class II equipment
Environmental protection IP20
Operating temperature range -25°C to 55°C (-13°F to 131°F)
AC Input 100 – 240 VAC 44/66 Hz
DC Output 24 VDC / 1.3 A
Cross sections input/output

0.08 to 2.5 mm² (AWG 28 to 12)

4

Figure 41: Industrial Power Supply (XXXSYSPS)

4

Copyright Wago®

Accessories

62 Rev. D7 Jul 2017 Marathon MM

9.9 Terminal Box

The terminal box is designed to provide IP66 (NEMA-4) protection to the terminal block, see section

6.2 Electrical Installation, page 28, and a power supply for the sensor. The box should be surface
mounted using the flanges and holes provided. It should be mounted in such a manner to allow the free
flow of air around the unit. Ambient temperatures should be kept within the range of 0 to 50°C (32 to
120°F).

Technical data for the power supply:

AC input 100 – 240 VAC 50/60 Hz
DC output 24 VDC / 1.1 A
Operating temperature -20 to 60°C (-4 to 140°F)
Humidity 20 to 90%, non-condensing

Figure 42: Terminal Box (RAYMAPB)

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Marathon MM Rev. D7 Jul 2017 63

9.10 Low Temp Cable

The 12-wire low temp cable (XXX2CLTCB…) is used for wiring the sensor with the 24 VDC power
supply, all outputs, and the RS485 interface. The cable is PUR (Polyurethane) coated and withstands
ambient temperatures form -40 to 105°C (-40°F to 221°F). PUR coated cables are flexible and have good
to excellent resistance to against oil, bases, and acids.

 Temperature: -40 to 105°C (-40°F to 221°F)
 Cable material PUR- 11Y (Polyurethane), Halogen free, Silicone free
 Cable diameter: 7.2 mm (0.283 in) nominal
 Conductors:

Power supply 2 wires (black/red)

Conductor: 0.2 mm² (AWG 24), 7x32 tinned copper
Isolation: PE- 2YI1
Shield: none

RS485 interface 2 twisted pairs (black/white and purple/gray)

Conductor: 0,2 mm² (AWG 24), 7x32 tinned copper
Isolation: PE- 2YI1
Shield: CDV-15, 85% covered

Outputs and Ground 6 wires (green/brown/blue/orange/yellow/clear)

Conductor: 0,2 mm² (AWG 24), 7x32 tinned copper
Isolation: PE- 2YI1
Shield: none

Further information for wiring the cable can be found in section 6.2 Electrical Installation, page 28.

The low temp cable can be purchased from the manufacturer in the following lengths:
4 m, 8 m, 15 m, 30 m, 60 m (13 ft., 26 ft., 49 ft., 98 ft., 197 ft.)

If you cut the cable to shorten it, notice that both sets of twisted-pair wires have drain wires inside their
insulation. These drain wires (and the white wire that is not part of the twisted pair) must be connected
to the terminal labeled CLEAR.

If you purchase your own RS485 cable, use wire with the same specifications as those listed above.
Maximum RS485 cable length is 1.200 meters (4000 ft).

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64 Rev. D7 Jul 2017 Marathon MM

9.11 High Temp Cable

The 12-wire cable (XXX2CCB…) is used for wiring the sensor with the 24 VDC power supply, all
outputs, and the RS485 interface. The cable is Teflon coated and withstands ambient temperatures form

-80 to 200°C (-112°F to 392°F). Teflon coated temperature cables have good to excellent resistance to
oxidation, heat, weather, sun, ozone, flame, water, acid, alkalis, and alcohol, but poor resistance to
gasoline, kerosene, and degreaser solvents.

 Power supply 2 wires (black/red)

Conductor: 0.3 mm² (AWG 22), 7x30 tinned copper
Isolation: FEP 0.15 mm wall (0.006 in)
Shield: none

 RS485 interface 2 twisted pairs (black/white and purple/gray)

Conductor: 0,22 mm² (AWG 24), 7x32 tinned copper
Isolation: FEP 0.15 mm wall (0.006 in)
Shield: Aluminized Mylar with drain wire

 Outputs and Ground 6 wires (green/brown/blue/orange/yellow/clear)

Conductor: 0,22 mm² (AWG 24), 7x32 tinned copper
Isolation: FEP 0.15 mm wall (0.006 in)
Shield: none

 Cable diameter: 7 mm (0.275 in) nominal
 Temperature: UL-rated at -80 to 200°C (-112°F to 392°F)

Teflon develops poisonous gasses when it comes into contact with flames!

Further information for wiring the cable can be found in section 6.2 Electrical Installation, page 28.

High temp 12-wire cable can be purchased from the manufacturer in the following lengths:
4 m, 8 m, 15 m, 30 m, 60 m (13 ft., 26 ft., 49 ft., 98 ft., 197 ft.)

If you cut the cable to shorten it, notice that both sets of twisted-pair wires have drain wires inside their
insulation. These drain wires (and the white wire that is not part of the twisted pair) must be connected
to the terminal labeled CLEAR.

If you purchase your own RS485 cable, use wire with the same specifications as those listed above.
Maximum RS485 cable length is 1.200 m (4000 ft).

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Marathon MM Rev. D7 Jul 2017 65

9.12 Protective Window

Protective windows can be used to protect the sensor’s optics against dust and other contamination.
The following table provides an overview of the available protective windows recommended for the
spectral models. All protective windows have a transmission below 100%.

To avoid erroneous readings, ensure that the transmission for the appropriate
protective window must be set in the sensor, see section 7.2 Operation Modes, page 34!

Order number

Identification

Model

Material

Transmission

XXXMMACTWL

no dot

Focus SF/VF:

LT, 3M, MT, G5

Zinc Sulphide

0.75 ±0.05

XXXMMACTWLS

no dot

Focus SF/VF:

LT, 3M, MT, G5

Zinc Sulphide

stainless steel

0.75 ±0.05

XXXMMACTWLCF

1 dot

Close Focus CF:

LT, 3M

Zinc Sulphide

0.75 ±0.05

XXXMMACTWLCFS

1 dot

Close Focus CF:

LT, 3M

Zinc Sulphide

stainless steel

0.75 ±0.05

XXXMMACTWLF1

no dot

LT

Plastic Foil

stainless steel

0.75 ±0.05
XXXMMACTWGP

2 dots

1M, 2M

Fused Silica

0.93 0.05

XXXMMACTWGPS

2 dots

1M, 2M

Fused Silica

stainless steel

0.93 0.05

Tab. 7: Protective Windows

For special requirements, please contact your local vendor or representative about our range of special
protective windows.

Figure 43: Dimensions for Protective Window(left: SF version, right: CF version)

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66 Rev. D7 Jul 2017 Marathon MM

9.13 ThermoJacket

The ThermoJacket gives you the ability to use the sensor in ambient temperatures up to 315°C (600°F).
The ThermoJacket’s rugged cast aluminum housing completely encloses the sensor and provides water
and/or air cooling and air purging in one unit. The sensor can be installed or removed from the
ThermoJacket housing in its mounted position.

Figure 44: ThermoJacket (RAYTXXTJ4) with Mounting Base (XXXTXXMB)

For more information see the ThermoJacket’s manual.

9.14 {reserved}

9.15 {reserved}

Programming Guide

Marathon MM Rev. D7 Jul 2017 67

10 Programming Guide

This section explains the sensor’s communication protocol. A protocol is the set of commands that
define all possible communications with the sensor. The commands are described along with their
associated ASCII command characters and related message format information. Use them when writing
custom programs for your applications or when communicating with your sensor with a terminal
program.

10.1 Serial Interface versus Control Panel

Since the sensor includes a control panel, the possibility exists for the user to make manual changes to
parameter settings. To resolve conflicts between manual parameter settings and settings by means of
the serial interface, the sensor observes the following rules:

 Command precedence: the most recent parameter change is valid, whether originating from

control panel or the serial interface.

 If a manual parameter change on the control panel is made, the sensor will transmit a

“notification” string to the host (e.g. a PC). Notification strings are suppressed in multidrop

mode.

10.2 Storing of Parameters

All sensor parameters, which are changed via the serial interface, are changed in the sensor internal
EEPROM memory. The EEPROM memory will retain all information after powering off the sensor.

10.3 Command Structure

After transmitting one command, it is obligatory to wait for the response from the sensor before sending
another. Make sure that a command sent was completely transmitted from the sender before the next
command can be sent.

All commands must be entered in upper case (capital) letters!

10.3.1 Requesting a parameter (Poll Mode)

?E<CR> “?” is the command for “request”
“E” is the parameter requested
<CR> carriage return (0Dh) is closing the request

10.3.2 Setting a parameter (Poll Mode)

E=0.975<CR> “E” is the parameter to be set
“=” is the command for “set a parameter”
“0.975” is the value for the parameter
<CR> carriage return (0Dh) is closing the setting

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68 Rev. D7 Jul 2017 Marathon MM

10.3.3 Sensor response

!E0.975<CR><LF> “!” is the parameter for “answer”
“E” is the parameter
“0.975” is the value for the parameter
<CR> <LF> (0Dh 0Ah) is closing the answer

For processing the received commands, the device needs up to 500 ms in the normal case. For certain
commands, this time can be even longer, see <Time out> parameter given in section 10.12 Command

List, page 78.

10.3.4 Sensor notification

With a notification the sensor informs the host, that the sensor or the firmware was reset.
#XI1<CR><LF> “#” is the parameter for “Notification”
“XI1” is the value for the notification (e.g. “XI1” firmware reset)
<CR> <LF> (0Dh 0Ah) is closing the notification
To track the sensor’s reset, XI remains unequal to zero as long as XI=0 is set manually via the digital
interface.

With a notification the sensor also informs the host, that a parameter was set on the control panel
manually.
#XL1<CR><LF> “#” is the parameter for “Notification”
“XL1” is the value for the notification (e.g. “XL1” laser switched on)
<CR> <LF> (0Dh 0Ah) is closing the notification

10.3.5 Error Messages

An asterisk * will be transmitted back to the host in the event of an “illegal” instruction. An illegal
instruction is considered to be one of the following:

 “*Unknown Command” – any non-used or non-allowed character (e.g. lower case characters)
 “*Range Error” – an “out-of-range” parameter value
 “*Syntax Error” – a value entered in an incorrect format
 “*Function impossible” – unit not in correct modus to execute the requested function

10.4 Transfer Modes

There are two possible transfer modes for the serial interface.
Poll Mode: The current value of any individual parameter can be requested by the host. The

sensor responds once with the value at the selected baud rate.

Burst Mode: A pre-defined data string, a so called “burst string”, will be transferred continuously

as long as the burst mode is activated.

V=P “P” starts the poll mode
V=B “B” starts the burst mode
$=UTIEECCS “$” sets the content of the burst string:

“U” for temperature unit
“T” for target temperature
“I” for internal temperature of the sensor
“E” for emissivity value
“EC” for error code
“CS” adds a checksum

Programming Guide

Marathon MM Rev. D7 Jul 2017 69

?$ gives the burst string parameters while in poll mode, e.g. “UTIE”
?X$ gives the burst string content while in poll mode, e.g. “UC T0150.3 I0027.1 E0.950”

Return from burst mode to poll mode

4-Wire Communication: send “V=P”
2-Wire Communication: send “V=P”. It could be necessary to send the command more than one

times.

10.5 Checksum

The destination for the burst string is often a Windows PC. The Windows operating system is non
deterministic and known to let the buffer of the serial communication overflow. To test the burst string
a checksum can be added to it by writing <CS> to the burst string definition string ($=...).

The <CS> command can also be used in the polling mode. <CS=1> activates the checksum transfer as a
3 digit integer number.

Example:
?CS //asks for the checksum status
!CS0 //answer: no checksum activated
CS=1 //enable the checksum calculation
!CS1 CS048 //answer: checksum is activated, checksum added, checksum in decimal format

Character Transmission Check

You can check the correctness of transmitted strings by evaluating the block check character (BCC), the
checksum. This can be done by taking the exclusive OR (XOR) of the ASCII values of all the characters
transmitted from the start character (here: “!”) up to the “S” but excluding the checksum value itself
(here: 127), carriage return <CR> and line feed <LF>. For example, the shaded characters are included as
follows:

! E 0 . 5

<space>

C S 127

<CR>

<LF>

Please note, the start character can be one of the following: “!”, “?”, “*”, “#”, <multidrop address>, <first
character of the burst string>.
You can evaluate the received string easily by converting the ASCII values to Binary and progressively
adding the Binary values together, minding the following rules for taking the XOR:

0 1 1 0

0 1 0 1

0 0 1 1

The sent checksum from the exemplary line above needs to be identical to the calculated checksum
below.

Programming Guide

70 Rev. D7 Jul 2017 Marathon MM

ASCII

HEX

Binary

Dec

!

21

0010 0001

E

45

0100 0101

0

30

0011 0000

.

2E

0010 1110

5

35

0011 0101

<space>

20

0010 0000

C

43

0100 0011

S

53

0101 0011

7F

0111 1111

127

calculated checksum via XOR operation

Algorithm for a character wise executed XOR operation given in exemplary Basic programming code:

Bcc = 0
For I = 1 To Len(String)

Bcc = Bcc Xor Asc(Mid$(String, I, 1))

Next I

10.6 Burst Mode

10.6.1 Speed

The communications of the sensor are capable of operating in either burst mode or poll mode. Poll mode
requires that a query be issued by a host PC and the unit will respond to the query. In burst mode the
unit transmits a pre-configured burst string at a certain rate.

LT, G5, MT, 3M, and G7 units produce a new temperature read (sample time) every 20 ms.
2M and 1M units produce a new temperature read (sample time) every 1 ms.

However, the communications of the sensor in burst mode are limited by the computer baud rate as
well as the length and content of the burst string.

 The Standard burst mode cycle time is 50 ms. If the burst string contains characters other than

“T”, “I”, or “XT” then the unit will transmit the string every 50 ms. Example burst
programmed so that $=TIXTE produces the string <T0150.3 I0027.1 XT00 E0.950> every 50 ms.

 The burst mode cycle time of the sensor can be reduced by shortening the length of the burst

string. A Faster burst mode cycle time can be achieved when the burst string is configured to
contain no other characters than “T”, “I”, and “XT”.
Example 1: $=TIXT results in <T0150.3 I0027.1 XT00>
Example 2: $=TI results in <T0150.3 I0027.1>.
When the burst string is configured in this way the unit will transmit the string with 20 ms for
LT, G5, MT, 3M, and G7 models and 5 ms for 2M and 1M models). Due to this faster rate of
data transmission, communications will now be limited by the baud rate of the host. If the
host computer does not have a fast enough baud rate then data will be lost and the effective
data transmission rate will be slower than the cycle time of the unit.

 Because the required baud rate is a function of the number of characters in the burst string, the

Fastest burst mode cycle time can effectively be achieved by reducing the number of

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Marathon MM Rev. D7 Jul 2017 71

characters in the burst string. Using this mode automatically sets the burst string to contain

only the values for the “T”, “I” and “XT” parameters. However, the “T”, “I” and “XT”

characters are removed from the burst string.. , Issuing the command $=$ sets the unit into the
fastest burst and changes the format of the burst string from <T0150.3 I0027.1 XT00> to <0150.3

0027.1 00>. Because of the burst string is now shorter, the required baud rate will be slower
and the effective transmission rate will be faster.

10.6.2 Minimum Baud Rate

The minimum required interface baud rate depends on the number of transferred characters and the
read cycle time of the burst mode (standard, fast, or fastest). It may be computed as the following:

cycle

charbit

t

nnb



where:

b = minimum required interface baud rate in [bit/s]
nbit = the number of necessary bits for one transferred character including stop bit, is always 9 (8 data
bits and 1 stop bit), given in [bit/char]
nchar = the number of characters in the burst string including blanks, <CR>, and <LF>, given in [char]
tcycle = read cycle time given in [s]

Example:

The burst string in the format “$=TIXT” + “$=$” gives the content with 12 characters, e.g. “1234.5 46
0<CR>”. What is the minimum required interface baud rate in the very fast burst mode with 1 ms read

cycle time?

s

bit

s

bit

schar

charbit

b 115200108000

101

129

3











10.7 Sensor Information

The sensor information is factory installed as read only values.

Command

Description

Answer (example)

?XU

Name of the sensor

“!XUMMLT”

?DS

Additional remark, e.g. for special numbers

“!DSRAY“

?XV

Serial number of the sensor

“!XV2C027“

?XR

Firmware revision number

“!XR2.08“

?XH

Maximum temperature of the sensor

“!XH0800.0“

?XB

Minimum temperature of the sensor

“!XB-040.0“

Table 9: Sensor Information

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72 Rev. D7 Jul 2017 Marathon MM

10.8 Sensor Setup

10.8.1 General Settings

U=C sets the physical unit for the temperature value (C or F or K). In case of a changed

physical unit all temperature related parameters (e.g., thresholds) are converted

automatically.
E=0.950 sets the emissivity according to the setting of “ES” command
A=250 sets the ambient background temperature compensation according to the setting of

“AC” command
XG=1.000 sets the transmission

?T asks for the target temperature
?I asks for the internal temperature of the sensor
?Q asks for the energy value of the target temperature

10.8.2 Sample Time

The sample time roughly defines the time between the update of the analog output. On all units this is
factory defined to be equal to the stated response time of the unit. However, LT, G5, MT, 3M, and G7
sensors have the capability to update the analog output at rates faster than the stated response time.
Reducing the sample time will reduce the time that the AD converter is averaging the detector signal.
This reduced averaging can result in considerably more noise in the analog output signal, thus this
setting should not be changed under most circumstances. The sample time can be set to the following
values:

ST=20000 sets sample time to 20 ms, for complete suppressing of 50 Hz noise
ST=16666 sets sample time to 16.6 ms, for complete suppressing of 60 Hz noise
ST=2000 sets sample time to 2 ms, for fastest possible analog update rate that provides a

smooth step response, but with higher noise.

10.8.3 Temperature Pre-Processing

The samples from the AD converter can be processed before or after temperature calculation. The
following filters are available for temperature pre-processing:
FF=0 0 0 switches the filter off. This command is for 2M and 1M devices and allows for

transient events as short as 900 µs in duration to be captured. This mode greatly
increases the amount of noise on the unit’s output.

FF=1 <threshold> 0 averages the last 16 samples. Over the <threshold> no averaging is applied. The

<threshold> is given in AD counts. Use the command Q for getting AD counts.
(default value: <threshold> = 750).

FF=2 0 0 sets the filter to consider the detector response curve for LT, G5, MT, 3M, and G7

devices to allow for transient events as short as 20 ms in duration to be captured.
This mode greatly increases the amount of noise on the unit’s output.

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Marathon MM Rev. D7 Jul 2017 73

Figure 49: Typical step responses at the output depending on the setting

of FF and ST (example for LT sensor)

FF = 1
ST = 20000

FF = 1
ST = 2000

FF = 2
ST = 20000

FF = 2
ST = 2000

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74 Rev. D7 Jul 2017 Marathon MM

10.8.4 Temperature Range

The device has a standard range in which it is calibrated. This range may be extended by the internal
reserve.
RT=S switches to the standard temperature range
RT=E switches to the extended temperature range

All parameters of the technical specification (e.g. accuracy) are valid only inside the standard
temperature range – there is no specification for the extended temperature range!

10.8.5 Emissivity Setting

The emissivity setting is selected by means of the “ES” command.
ES=I sets emissivity by a constant number
ES=E sets the emissivity by an analog voltage on the external input. The ambient

background temperature compensation will be set off (“AC=0”) when it was in

external mode before (“AC=2”). For more information see section 7.4.3 External

Input, page 44.

?E asks for the current emissivity value

10.8.6 Ambient Background Temperature Compensation

In case the ambient background temperature is not represented by the internal sensor temperature, you
must set the ambient background temperature values as follows:
A=250.0 current ambient background temperature according to the setting of “AC”

command
AC=0 no compensation (internal sensor temperature equal to ambient temperature)
AC=1 compensation with a constant temperature value set with command “A”
AC=2 compensation with an analog voltage signal at the external input,

0 – 5 VDC corresponds to a temperature range set by using the commands AL and

AH.

Resulting temperature is read out by command “A”. The emissivity setting will be

set to internally (“ES=I”). For more information see section 7.4.3 External Input,

page 44.

10.8.7 Temperature Hold Functions

The following table lists the various temperature hold functions along with their resets and timing
values. Use this table as a guide for programming your sensor and adjusting the hold times.
Please note, the setting of some commands is not possible by using of the control panel, these commands
are only available by means of the software. For further information see section 7.3 Signal Processing,
page 37.

Hold Function

RESET by

Peak Time

Valley Time

Thresold

Hystersis

Decay Rate

Protocol code

P F C

XY

XE

none

none

000.0

000.0

-*

-*

-*

Peak Hold

timer

000.1-299.9

000.0

000.0

-*

000.0

Peak Hold

trigger

300.0**

000.0

000.0

-*

000.0

Peak Hold

sent burst string

Peak Hold with decay

timer

000.1-299.9

000.0

000.0

-*

0001-3000

Advanced Peak Hold

trigger or threshold

300.0**

000.0

Temp. range

-*

0000

Advanced Peak Hold

timer or threshold

000.1-299.9

000.0

Temp. range

-*

0000

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Marathon MM Rev. D7 Jul 2017 75

Advanced Peak Hold with decay

timer or threshold

000.1-299.9

000.0

Temp. range

-*

0001-3000

Valley Hold

timer

000.0

000.1-299.9

000.0

-*

000.0

Valley Hold

trigger

000.0

300.0**

000.0

-*

000.0

Valley Hold with decay

timer

000.0

000.1-299.9

000.0

-*

0001-3000

Advanced Valley Hold

trigger or threshold

000.0

300.0**

Temp. range

-*

0000

Advanced Valley Hold

timer or threshold

000.0

000.1-299.9

Temp. range

-*

0000

Advanced Valley Hold with
decay

timer or threshold

000.0

000.1-299.9

Temp. range

-*

0001-3000

* Value does not affect the function type
** Holds infinitely or until triggered

As alternative to the linear decay an averaged decay was implemented. For selection see the following
table.

Hold Function

Decay Rate [K/s]

Adv. Average Hold Time [s]

Adv...Hold with Linear Decay

XE = 0001 - 3000

0

Adv...Hold with Averaged Decay

*

AA = 0.1 - 999

Table 10: Decay Functions

Please note the different meanings of the parameters from “XE” and “AA”:

 The linear decay rate (XE) is given in K/s
 The averaged decay (AA) gives the time when the signal will have reached 90% of the final

temperature.

10.9 Sensor Control

10.9.1 Current Output

The current output corresponds to the target temperature value. The output can be set to 0 – 20 mA or
4 – 20 mA.
XO=4 sets the current output range to 4 – 20 mA
H=500 sets the temperature for the top current output value to 500 (in current scale)

e.g., the top current output value of 20 mA shall represent 500°C

L=0 sets the temperature for the bottom current output value to 0 (in current scale)

e.g., the bottom current output value of 4 mA shall represent 0°C

The minimum temperature span between “H” and “L” command values is 20 K.

For testing purposes the output can be forced to provide a constant current value.
O=13.57 output of a constant current at 13.57 mA
O=60 switches back to the target temperature controlled output

10.9.2 Relay Output

The relay output (alarm output) can be triggered:

 by target temperature
 by internal sensor temperature
 manually (command controlled)

The alarm output can be set either to N.C. (normally closed: relay contacts are closed while in the home
position) or N.O. (normally open: relay contacts are open while in the home position).

K=2 alarm output triggered by target temperature and internal sensor temperature, N.O.

normally open

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76 Rev. D7 Jul 2017 Marathon MM

K=3 alarm output triggered by target temperature and internal sensor temperature, N.C.

normally closed
K=4 alarm output triggered by internal sensor temperature, N.O. normally open
K=5 alarm output triggered by internal sensor temperature, N.C. normally closed
K=6 alarm output triggered by target temperature, N.O. normally open
K=7 alarm output triggered by target temperature, N.C. normally closed
XS=125.3 sets the alarm threshold to 125.3 in current scale. The alarm threshold is used for the

target temperature only (see command XS). If the internal sensor temperature is

selected as the trigger source (K=4, K=5), use the command <DA> for defining the

alarm threshold.

10.9.3 External Input

The external input is shared by several functions, see section 7.4.3 External Input, page 44. The following
commands will change the input type automatically:

P=300, F=300 external input as trigger, resets the (advanced) Peak/Valley Hold function
ES=E external input as voltage input (0 V – 5 V) for setting the emissivity
AC=2 external input as voltage input (0 V – 5 V) for setting the ambient temperature
XL=T external input for On/Off switching of the laser

One of the basic rules for the used protocol here does forbid cross dependencies between commands.
So the user has to take care not to use two functions the same time. Using more than one function will
not destroy the device electrically but may result in malfunction.

?XT gives the actual trigger state
?TV gives the measured input voltage

10.9.4 Lock Mode

The access to the sensor is possible via serial interface or via direct user input on the control panel. With
a command it is possible to lock the mode buttons. This allows access to the sensor only via serial
interface.

J=L direct user input via mode buttons on control panel denied

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Marathon MM Rev. D7 Jul 2017 77

10.10 RS485 Communication

The serial RS485 communication can be either in 2-wire or 4-wire mode.

HM=2 sets the sensor into 2-wire communication mode.
HM=4 sets the sensor into 4-wire communication mode

For setting the baud rate, one of the following two commands must be selected.

D=576 sets the baud rate to 57600, baud rate must be given with 3 numbers (003, 012, 024,

096, 192, 384, 576, 115).

BR=57600 sets the baud rate to 57600, baud rate must be given with up to 6 numbers (300, 1200,

2400, 9600, 19200, 38400, 57600, 115200)

In case of using the sensor in 2-wire mode the baud rate is limited to 38400.

10.11 Multidrop Mode

Up to 32 devices can be connected within an RS485 multidrop network, see section 6.4 Multiple Sensors

in a Network, page 32. To direct a command to one sensor among the 32 possible, it is necessary to

“address” a command. Therefore, a 3-digit number is set prior the command. The 3-digit number is
determined between 001 and 032. A unit with the address 000 is a single unit and not in multidrop
mode.

XA=024 sets the device to address 24

Changing an address:

(e.g., the address is change from 17 to 24)
command answer

“017?E” “017E0.950” // asking one sensor on address 17
“017XA=024” “017XA024” // setting of a new address
“024?E” “024E0.950” // asking same sensor now on address 24

If a command is transferred, starting with the 3-digit number 000, all units (with addresses from 001 to

032) connected will get this command - without to send an answer.

command answer

“024?E” “024E0.950”
“000E=0.5” will be executed from all sensors, no answer
“024?E” “024E0.500”
“012?E” “012E0.500”

When a sensor has a multidrop address between 001 and 032, its control panel is
automatically locked. It can be unlocked with the command “xxxJ=U”, where xxx is the
multidrop address!

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78 Rev. D7 Jul 2017 Marathon MM

10.12 Command List

P ... Poll, B ... Burst, S ... Set, N ... Notification

(1) n = number, X = uppercase letter

Description

Char

Format

P

B

S

N

legal values

factory
default

LCD
Char

Poll parameter

?

?X/?XX



?T

Set parameter

=

X/XX=...



E=0.85

Multidrop addressing

001?E

 

answer: 001!E0.950

000

Error message

* *Syntax error

Acknowledge message

! !P010

Burst string format

$

 

UTEI

Ambient radiation
correction

A

nnnn.n

 

0 – max. range

Advanced hold averaging
time

AA

nnn.n

 

0 = no averaging

0.1 … 999.0 s

0

Ambient compensation
control

AC

n

 

0 = no compensation,
1 = by command <A>
2 = external input (0V—5V)

0 Low range for ambient
control with external input
at 0V

AL

nnnn.n

 

min range – max range

min range

High range for ambient
control with external input
at 5 V

AH

nnnn.n

 

min range – max range

max range

Burst Peak Hold
for 1M/2M models only

BP

n

 

0 = off (no Peak Hold)
1 = on
Polling: Peak Hold time over
<BS> + 10 ms
Burst: Peak Hold time over
<BS>

0
Baud rate

BR

nnnnnn

 

9600, 19200, 38400, 57600,
115200
Time out: 2000 ms

38400 with
delivery, no
change with
factory
default

Burst speed

BS

integer

 

number in milliseconds
50ms ... 20s
for 1M/2M models down to 5
ms but sample time guaranteed
steps in 5 ms

50

Advanced hold threshold

C

nnnn.n

 

in current scale (°C/°F/°K)

<= min.range

--advanced
off

min.
range

Internal temp. alarm
threshold

DA

nn.n

 

-10 to 65°C (14 to 149°F)

65°C (149°F)

Device special

DS

XXX



()

e.g. !DSRAY

Set at
production

Emissivity internal

E

n.nnn

  

0.1 - 1.15

0.95

E

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Marathon MM Rev. D7 Jul 2017 79

Description

Char

Format

P

B

S

N

legal values

factory
default

LCD
Char

Error code

EC

nnnn





hex value of ErrCode:

BIT0 Object temp. over range
BIT1 Object temp. under range
BIT2 Internal temp. over range
BIT3 Internal temp. under range
BIT4 ADC initialisation error
BIT5 EEPROM error user space
BIT6 EEPROM error calibration
BIT7 Device in init phase
BIT8 Focus motor error
BIT9 Focus zero position lost
BITA Focus motor moving
BITB mA output over range
BITC mA output under range

Emissivity source

ES

X

 

I = Emissivity from Internal (by
command)
E = Emissivity from External
analog input (0V—5V)

I

Valley hold time

F

Nnn.n

  



0.0 - 299.9s (300 = )

0.0s

V

Focal distance

FC

nnn.n

 



within the focus range, in meter
Time out: 1000 ms (Polling)
Time out: 2000 ms (Setting)

0.6 F Activate pre-calculation
Filter

FF

n 0 0

 

0 = off
1 = Filter Average
2 = Filter Detector

1

Average time

G

nnn.n

  



0.0 – 999.0 s

0.0 s

A

Top of mA range

H

nnnn.n

  



H

RS485 mode

HM

n

 



2 = 2-wire, 4 = 4-wire

4

COM

Sensor internal temp.

I

nnn.n





in current scale (C/F)

Switch panel lock

J

X

 



L = locked
U = unlocked

unlocked

CP

Relay alarm output control

K

n

 

0 = off 1 = on
2 = Target and Internal
norm. open
3 = Target and Internal
norm. closed
4 = Internal, normal open
5 = Internal, norm. closed
6 = Target, norm. open
7 = Target, norm. closed

2

Bottom of mA range

L

nnnn.n

  



L

Output current

O

nn.nn

 

0.00 – 20.00 current in mA
21 = over range; 60 = controlled
by unit

60
After reset =
60

Peak hold time

P

nnn.n

  



0.0 - 299.9 s (300 = )

0.0 s

P

AD counts

Q

nnnnnnn





Reset

RS



Reset of the firmware,
acknowledged with:
!RS[CR][LF]
#XI1[CR][LF]
Time out: 12000 ms

Temperature range

RT

 

E = Extended range
S = Standard range
(= <bottomTemp> <topTemp>)

S

-

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80 Rev. D7 Jul 2017 Marathon MM

Description

Char

Format

P

B

S

N

legal values

factory
default

LCD
Char

Sample time

ST

X



()

For LT, G5, MT, 3M it can be
set to the following times (in
µs):
2000, 10000, 16666, 20000 or
33333

20000

-

Target temperature

T

nnnn.n





in current scale (C/F)

Thermal shock control

TS

n

 

Y / N
reserved for special models
only

N

Voltage at trigger pin

TV

float



in Volt

Temperature unit

U

X

  



C / K / F

C

U

Poll/burst mode

V

X

 

P=poll B=burst

poll mode

Handle video control

VI

n

 



0=OFF, 1=ON
N=not installed

0

UART counter
for 1M/2M models only

W

n





0 = off, 1 = on (for Poll Mode)
responds with 4 digit hex code
(max x7FFF)
Reset to 1 with activating the
burst mode V=B
Reset to 0 with resetting of
firmware or device

0

Burst string content

X$



Multidrop address

XA

0nn

 



0 – 32 (0  single unit mode)

0

Device bottom range limit

XB

nnnn.n



()

Deadband

XD

nn

 

1 – 55°C/K; 1-99°F

2 Decay rate

XE

nnnn

 

1-3000K/s

0

Restore factory defaults

XF



Time out: 12000 ms

Transmission

XG

n.nnn

  

0.1 - 1.0

1.0 T Device high range limit

XH

nnnn.n



()

Sensor initialisation

XI

n

  



1 after RESET, 2 if the internal
watchdog caused the reset, 0 if
XI=0

Laser control

XL

X 





0=OFF, 1=ON, N=not installed,
Y=installed, T=external input is
used to switch the laser

0

Analog output mode

XO

n

 

0 = 0...20mA, 4 = 4...20mA

4

Second relay threshold

XP

nnnn.n

 

XP = bottom range switches the
alarm mode off

bottom range
Firmware revision

XR



e.g. 1.01

Set in FW

Alarm threshold for target
temp.

XS

nnnn.n

 

XS = bottom range switches the
alarm mode off

bottom range
Trigger

XT

n



 

0 = inactive, 1 = active

0 Unit identification

XU



()

e.g. !XUMM

Serial number

XV



()

e.g. 98123

Advanced hold hysteresis

XY

nnnn

 

0 – 3000 K

2

Timer internal
for 1M/2M models only

Z  0 – 9999 ms

Maintenance

Marathon MM Rev. D7 Jul 2017 81

11 Maintenance

Our sales representatives and customer service are always at your disposal for questions regarding
application assistance, calibration, repair, and solutions to specific problems. Please contact your local
sales representative if you need assistance. In many cases, problems can be solved over the telephone.
If you need to return equipment for servicing, calibration, or repair, please contact our Service
Department before shipping. Phone numbers are listed at the beginning of this document.

To prevent possible electrical shock, fire or personal injury follow these guidelines:

 Have an approved technician repair the product.

11.1 Troubleshooting Minor Problems

Symptom

Probable Cause

Solution

No output

No power to instrument

Check the power supply

Erroneous temperature

Faulty sensor cable

Verify cable continuity

Erroneous temperature

Field of view obstruction

Remove the obstruction

Erroneous temperature

Window lens

Clean the lens

Erroneous temperature

Wrong emissivity

Correct the setting

Temperature fluctuates

Wrong signal processing

Correct Peak/Valley Hold or Average settings

Table 11: Troubleshooting

Maintenance

82 Rev. D7 Jul 2017 Marathon MM

11.2 Fail-Safe Operation

The Fail-Safe system is designed to alert the operator and provide a safe output in case of any system
failure. Basically, it is designed to shutdown the process in the event of a set-up error, system error, or
a failure in the sensor electronics.

The Fail-Safe circuit should never be relied on exclusively to protect critical heating
processes. Other safety devices should also be used to supplement this function!

When an error or failure does occur, the display indicates the possible failure area, and the output
circuits automatically adjust to their lowest or highest preset level. The following table shows the values
displayed on the control panel and transmitted over the serial interface.

Symptom

Error Code

Priority

0 – 20 mA Output

4 – 20 mA Output

Internal temperature over range

EIHH

1 (high)

21 to 24 mA

21 to 24 mA

Internal temperature under range

EIUU

2

0 mA

3.5 mA

Target temperature under range

EUUU

3

0 mA

3.5 mA

Target temperature over range

EHHH

4 (low)

21 to 24 mA

21 to 24 mA

Table 12: Error Codes and Current Output Values

The relay is controlled by the temperature selected on the display. If any failsafe code appears on the

display, the relay changes to the “abnormal” state. This causes the relay to change state, leaving a

normal numerical temperature output.

If two errors occur simultaneously, the higher priority error is the one that is presented on the digital
and analog outputs. For example, if the internal temperature is too high and the target temperature is
over range, the unit outputs EIHH on the display and digital output and 21 mA on the analog output.

Maintenance

Marathon MM Rev. D7 Jul 2017 83

11.3 Cleaning the Lens

Keep the lens clean at all times. Care should be taken when cleaning the lens. To clean the window, do
the following:

1. Lightly blow off loose particles with “canned” air (used for cleaning computer equipment) or a

small squeeze bellows (used for cleaning camera lenses).

2. Gently brush off any remaining particles with a soft camel hair brush or a soft lens tissue

(available from camera supply stores).

3. Clean remaining “dirt” using a cotton swab or soft lens tissue dampened in distilled water. Do

not scratch the surface.

For finger prints or other grease, use any of the following:

 Denatured alcohol
 Ethanol
 Kodak lens cleaner

Apply one of the above to the lens. Wipe gently with a soft, clean cloth until you see colors on the
surface, then allow to air dry. Do not wipe the surface dry, this may scratch the surface.
If silicones (used in hand creams) get on the window, gently wipe the surface with Hexane. Allow to air
dry.

Do not use any ammonia or any cleaners containing ammonia to clean the lens. This

may result in permanent damage to the lens’ surface!

Appendix

84 Rev. D7 Jul 2017 Marathon MM

12 Appendix

12.1 Determination of Emissivity

Emissivity is a measure of an object’s ability to absorb and emit infrared energy. It can have a value
between 0 and 1.0. For example a mirror has an emissivity of 0.1, while the so-called “Blackbody“
reaches an emissivity value of 1.0. If a higher than actual emissivity value is set, the output will read
low, provided the target temperature is above its ambient temperature. For example, if you have set

0.95 and the actual emissivity is 0.9, the temperature reading will be lower than the true temperature.
An object’s emissivity can be determined by one of the following methods:

1. Determine the actual temperature of the material using an RTD (PT100), a thermocouple, or any

other suitable method. Next, measure the object’s temperature and adjust emissivity setting until

the correct temperature value is reached. This is the correct emissivity for the measured material.

2. For relatively low temperatures (up to 260°C / 500°F) place a plastic sticker ( 38 mm / 1.5 in.,

XXXRPMACED) on the object to be measured. This sticker should be large enough to cover the

target spot. Next, measure the sticker’s temperature using an emissivity setting of 0.95. Finally,

measure the temperature of an adjacent area on the object and adjust the emissivity setting until
the same temperature is reached. This is the correct emissivity for the measured material.

3. If possible, apply flat black paint to a portion of the surface of the object. The emissivity of the paint

is 0.95. Next, measure the temperature of the painted area using an emissivity setting of 0.95.
Finally, measure the temperature of an adjacent area on the object and adjust the emissivity until
the same temperature is reached. This is the correct emissivity for the measured material.

12.2 Typical Emissivity Values

The following table provides a brief reference guide for determining emissivity and can be used when
one of the above methods is not practical. Emissivity values shown in the table are only approximate,
since several parameters may affect the emissivity of a material. These include the following:

1. Temperature

2. Angle of measurement

3. Geometry (plane, concave, convex)

4. Thickness

5. Surface quality (polished, rough, oxidized, sandblasted)

6. Spectral range of measurement

7. Transmission (e.g. thin films plastics)

Appendix

Marathon MM Rev. D7 Jul 2017 85

METALS

Emissivity

Material

1 µm

1.6 µm

2.3 µm

3.9 µm

5 µm

7.9 µm

8 – 14 µm

Aluminum

Unoxidized

0.1-0.2

0.02-0.2

0.02-0.2

0.02-0.2

0.02-0.2

0.03-0.15

0.02-0.1

Oxidized

0.4

0.4

0.2-0.4

0.2-0.4

0.2-0.4

0.20-0.55

0.2-0.4

Alloy A3003,
Oxidized

0.4

0.4

0.4

0.4 0.3
Roughened

0.2-0.8

0.2-0.6

0.2-0.6

0.1-0.4

0.1-0.4

0.1-0.3

Polished

0.1-0.2

0.02-0.1

0.02-0.1

0.02-0.1

0.02-0.1

0.02-0.1

Brass

Polished

0.1-0.3

0.01-0.05

0.01-0.05

0.01-0.05

0.01-0.05

0.03-0.15

0.01-0.05

Burnished

0.4

0.3

0.3 0.3

Oxidized

0.6

0.6

0.6

0.5

0.5 0.5

Chromium

0.4

0.4

0.05-0.3

0.03-0.3

0.03-0.3

0.10-0.20

0.02-0.2

Oxidized

0.60-0.85

Copper

Polished

0.03

0.03

0.03

0.03

0.03-0.15

0.03

Roughened

0.05-0.2

0.05-0.2

0.05-0.15

0.05-0.15

0.05-0.1

Oxidized

0.2-0.8

0.2-0.9

0.7-0.9

0.5-0.8

0.5-0.8

0.40-0.80

0.4-0.8

Gold

0.3

0.01-0.1

0.01-0.1

0.01-0.1

0.01-0.1

0.02-0.15

0.01-0.1

Haynes

Alloy

0.5-0.9

0.6-0.9

0.6-0.9

0.3-0.8

0.3-0.8

0.3-0.8

Inconel

Oxidized

0.4-0.9

0.6-0.9

0.6-0.9

0.6-0.9

0.6-0.9

0.80-0.90

0.7-0.95

Sandblasted

0.3-0.4

0.3-0.6

0.3-0.6

0.3-0.6

0.3-0.6

0.3-0.6

polished

0.2-0.5

0.25

0.25

0.15

0.15

0.10-0.25

0.15

Iron Oxidized

0.4-0.8

0.5-0.8

0.7-0.9

0.6-0.9

0.6-0.9

0.80-0.95

0.5-0.9

Unoxidized

0.35

0.1-0.3

0.1-0.3

0.05-0.25

0.05-0.25

0.05-0.2

Rusted

0.6-0.9

0.6-0.9

0.5-0.8

0.5-0.8

0.5-0.7

Molten

0.35

0.4-0.6

0.4-0.6

Iron, Cast

Oxidized

0.7-0.9

0.7-0.9

0.7-0.9

0.65-0.95

0.65-0.95

0.10-0.95

0.6-0.95

Unoxidized

0.35

0.3

0.1-0.3

0.25

0.25

0.10-0.15

0.2

Molten

0.35

0.3-0.4

0.3-0.4

0.2-0.3

0.2-0.3

0.2-0.3

Iron, Wrought

Dull

0.9

0.9

0.95

0.9

0.9 0.9

Lead

Polished

0.35

0.05-0.2

0.05-0.2

0.05-0.2

0.05-0.2

0.05-0.1

Rough

0.65

0.6

0.5

0.4

0.4 0.4

Oxidized

0.3-0.7

0.3-0.7

0.2-0.7

0.2-0.7

0.2-0.6

Magnesium

0.3-0.8

0.05-0.3

0.05-0.2

0.03-0.15

0.03-0.15

0.02-0.1

Mercury

0.05-0.15

0.05-0.15

0.05-0.15

0.05-0.15

0.05-0.15

Molybdenum

Oxidized

0.5-0.9

0.4-0.9

0.4-0.9

0.3-0.7

0.3-0.7

0.2-0.6

Unoxidized

0.25-0.35

0.1-0.35

0.1-0.3

0.1-0.15

0.1-0.15

0.10-0.25

0.1

Appendix

86 Rev. D7 Jul 2017 Marathon MM

METALS

Emissivity

Material

1 µm

1.6 µm

2.3 µm

3.9 µm

5 µm

7.9 µm

8 – 14 µm

Monel (Ni-Cu)

0.3

0.2-0.6

0.2-0.6

0.1-0.5

0.1-0.5

0.10-0.25

0.1-0.14

Oxidized

0.60-0.85

0.7-0.9

Nickel

Oxidized

0.8-0.9

0.4-0.7

0.4-0.7

0.3-0.6

0.3-0.6

0.80-0.95

0.2-0.5

Electrolytic

0.2-0.4

0.1-0.3

0.1-0.2

0.1-0.15

0.1-0.15

0.05-0.15

Platinum

Black

0.95

0.95

0.9

0.9 0.9

Silver

0.02

0.02

0.02

0.02

0.03-0.15

0.02

Steel

Cold-Rolled

0.8-0.9

0.8-0.9

0.8-0.9

0.8-0.9

0.7-0.9

Ground Sheet

0.6-0.7

0.5-0.7

0.5-0.7

0.4-0.6

Polished Sheet

0.35

0.25

0.2

0.1

0.1

0.10-0.25

0.1

Molten

0.35

0.25-0.4

0.25-0.4

0.1-0.2

0.1-0.2

Oxidized

0.8-0.9

0.8-0.9

0.8-0.9

0.7-0.9

0.7-0.9

0.80-0.95

0.7-0.9

Stainless

0.35

0.2-0.9

0.2-0.9

0.15-0.8

0.15-0.8

0.10-0.25

0.1-0.8

Tin (Unoxidized)

0.25

0.1-0.3

0.1-0.3

0.05

0.05 0.05

Titanium

Polished

0.5-0.75

0.3-0.5

0.2-0.5

0.1-0.3

0.1-0.3

0.05-0.2

Oxidized

0.6-0.8

0.6-0.8

0.5-0.7

0.5-0.7

0.5-0.6

Tungsten

0.1-0.6

0.05-0.5

0.05-0.5

0.03

Polished

0.35-0.4

0.1-0.3

0.1-0.3

0.05-0.25

0.05-0.25

0.05-0.20

0.03-0.1

Zinc

Oxidized

0.6

0.15

0.15

0.1

0.1 0.1

Polished

0.5

0.05

0.05

0.03

0.03

0.15-0.25

0.02

Tab. 13: Typical Emissivity Values

Appendix

Marathon MM Rev. D7 Jul 2017 87

NON-METALS

Emissivity

Material

1 µm

1.6 µm

2.3 µm

5 µm

7.9 µm

8 – 14 µm

Asbestos

0.9 0.8

0.9 0.95

Asphalt

0.95

0.95-1.00

0.95

Basalt

0.7 0.7

Carbon

Unoxidized

0.8-0.95

0,8-0,9

0.8-0.9

0.8-0.9

Graphite

0.8-0.9

0.8-0.9

0.7-0.9

0.45-0.70

0.7-0.8

Carborundum

0.95

0.9 0.9

Ceramic

0.4 0.8-0.95

0.8-0.95

0.95

Clay

0.8-0.95

0.85-0.95

0.95

Coke

0.95-1.00

0.95-1.00

0.95-1.00

0.95-1.00

0.95-1.00

0.95-1.00

Concrete

0.65 0.9

0.9 0.95

Cloth

0.95 0.95

Glass

Plate

0.2

0.98

0.98

0.85

“Gob”

0.4-0.9

0.9

Gravel

0.95 0.95

Gypsum

0.4-0.97

0.8-0.95

Ice 0.98

Limestone

0.4-0.98

0.98

Paint (non-al.)

0.90-1.00

0.9-0.95

Paper (any color)

0.95

0.90-1.00

0.95

Plastic, opaque at 500
µm thickness (20 mils)

0.95 0.95

Rubber

0.9

0.95-1.00

0.95

Sand

0.9 0.9

Snow

0.9

Soil 0.9-0.98

Water

0.93

Wood, Natural

0.9-0.95

0.90-1.00

0.9-0.95

Tab. 14: Typical Emissivity Values

To optimize surface temperature measurements, consider the following guidelines:

 Determine the object emissivity using the instrument which is also to be used for the

measurements.

 Avoid reflections by shielding the object from surrounding temperature sources.
 For higher temperature objects use instruments with the shortest wavelength possible.
 For translucent materials such as plastic foils or glass, assure that the background is uniform

and lower in temperature than the object.

Notices

88 Rev. D7 Jul 2017 Marathon MM

13 Notices