Omega OS-MINI SERIES User manual

e-mail: [email protected]
For latest product manuals:
omega.com/en-us/pdf-manuals
TM
Shop online at
omega.com
User’s Guide
with
Optional
Touch
Screen
Display
Miniature Fixed Infrared
Sensor with Optional Touch
Screen Display

The information contained in this document is believed to be correct, but OMEGA accepts no liability for any errors it contains, and reserves
the right to alter specifications without notice.
Servicing North America:
U.S.A. Omega Engineering, Inc.
Headquarters: 800 Connecticut Ave. Suite 5N01, Norwalk, CT 06854
Toll-Free: 1-800-826-6342 (USA & Canada only)
Customer Service: 1-800-622-2378 (USA & Canada only)
Engineering Service: 1-800-872-9436 (USA & Canada only)
Tel: [phone] Fax: [phone]
e-mail: [email protected]
For Other Locations Visit omega.com/worldwide
omega.com [email protected]

UNRESTRICTED
The OS-Mini and OS-Mini22 are a range of miniature, non-contact infrared temperature sensors with
separate electronics modules.
All OS-Mini models have an adjustable emissivity setting and are capable of measuring a wide variety of
target materials, including food, paper, textiles, plastics, leather, tobacco, pharmaceuticals, chemicals,
rubber, coal and asphalt.
All OS-Mini22 models use a short measurement wavelength for greater accuracy, and improved tolerance
of optical obstructions or errors in emissivity setting, than long-wavelength sensors.
The optional touch screen interface for OS-Mini and OS-Mini22 provides temperature indication, alarms,
sensor configuration and data logging to MicroSD Card. For OS-Mini models specifically, an optional high-
temperature sensing head may be used in ambient temperatures of up to 180°C without cooling. The low-
noise cable on high ambient temperature models is resistant to interference from movement, so it is ideal
for mounting on moving objects such as robot arms.
Different choices of optics are available to measure small or large targets at short or long distances, and,
there is a choice of 4-20 mA, RS485 Modbus and alarm relay outputs.
OS-MINI SPECIFICATIONS
General
Temperature Range
See table of Model Numbers
Maximum Temperature Span (-CRT models)
1020°C
Minimum Temperature Span (-CRT models)
100°C
Output
4 to 20 mA or RS485 Modbus
Field of View
See table of Model Numbers
Accuracy
± 1°C or 1%, whichever is greater
Repeatability
± 0.5°C or 0.5%, whichever is greater
Emissivity Setting Range
0.20 to 1.00
Emissivity Setting Method
MA models: via two rotary switches in electronics
module
C4 models: via RS485
MA-R-D & CR-R-D models: via touch screen
Response Time, t90
240 ms (90% response)
Spectral Range
8 to 14 µm
Supply Voltage
24 V DC ± 5%
Maximum Current Draw
100 mA
Maximum Loop Impedance
-CB and -CRT models: 900 Ω (4 to 20 mA output)
Alarm Relays (-CRT models)
2 x Single Pole Changeover alarm relays rated
24 V DC, 1 A, isolated 500 V DC
MECHANICAL
Sensing head
Electronics Module
Construction
Stainless Steel 316
Die-cast Aluminum
Major Dimensions
Ø18 x 45 mm
98(w) x 64(h) x 36(d) mm
Mounting
M16 x 1 mm thread
Two M4 screws for wall mounting (see diagram)

UNRESTRICTED
Cable Length (sensing head to electronics module) 1 m (standard), up to 30 m (optional)
Weight with 1 m Cable
390 g (approx.)
Cable Connections
Removable screw terminal blocks (see
Connections). Conductor size: 28 AWG to 18
AWG
Output Cable Gland
Suitable for cable diameters 3.0 to 6.5 mm
ENVIRONMENTAL
Sensing Head
Electronics Module
(without touch
screen)
Electronics Module
(with touch screen)
Environmental Rating
IP65 (NEMA 4)
IP65 (NEMA 4)
–
Ambient Temperature
Range
See table of Model
Numbers
0°C to 60°C
0°C to 60°C
Relative Humidity
Maximum 95%
non-condensing
Maximum 95%
non-condensing
Maximum 95% non-
condensing
CE Marked
Yes
Yes
Yes
RoHS Compliant
Yes
Yes
Yes
ELECTROMAGNETIC COMPATIBILITY STANDARDS:
Class
Standard
Description
EMC Directive
EN61326-1:2006
Electrical equipment for measurement, control
and laboratory use –Industrial
- Immunity
IEC 61000-4-2
Electrostatic Discharge Immunity
IEC 61000-4-3
Electromagnetic Field Immunity
IEC 61000-4-4
Burst Immunity
IEC 61000-4-5
Surge Immunity
IEC 61000-4-6
Conducted RF Immunity
- Emissions
EN 55022A
RF Emissions Class A
EN 55022B
RF Emissions Class B
MODEL NUMBERS
The following combinations of ambient temperature range, optics, measured temperature range, output and
interface are available on OS-MINI sensors:
Series
Sensing Head
Operating
Temperature Range
Field of View
Measurement
Temperature Range
Output and
Interface
OS-MINI
MA
212
152
302
802
LT
MT
HT
XT
MA
CT
MA-R-D C4
C4-R-D
HA
201
HT XT
MA
CT
MA-R-D C4
C4-R-D

UNRESTRICTED
SENSING HEAD OPERATING TEMPERATURE RANGE
-MA 0°C to 60°C
-HA 0°C to 180°C
The high ambient temperature sensing head on -HA models is capable of withstanding temperatures of up
to 180°C without cooling. It is available with 20:1 optics.
There is no need to supply cooling air or water, and the miniature sensing head is much smaller than bulky,
cooled sensors.

UNRESTRICTED
OS-MINI22 SPECIFICATIONS
GENERAL
MECHANICAL
Sensing head
Electronics Module
Construction
Stainless Steel 316
Die-cast Aluminum
Major Dimensions
Ø18 x 45 mm
98(w) x 64(h) x 36(d) mm
Mounting
M16 x 1 mm thread
Requires two M4 screws for wall mounting (see
diagram)
Temperature Range
PT models: 100°C to 400°C
MT models: 250°C to 1000°C
HT models: 450°C to 2000°C
Maximum Temperature Span (-CRT models)
Full temperature range (up to 1550°C)
Minimum Temperature Span (-CRT models)
100°C
Output
4 to 20 mA or RS485 Modbus (up to 247 sensors
may be installed on a single Modbus network)
Field of View
See table of Model Numbers
Accuracy
± 2°C or 1% of reading, whichever is greater
Repeatability
± 0.5°C or 0.5% of reading, whichever is greater
Emissivity Setting Range
0.10 to 1.00
Emissivity Setting Method
-CB models: via two rotary switches in
electronics module
-BB and -BT models: via RS485
-CRT and -BT models: via touch screen
Response Time, t90
≥ 240 ms (90% response)
Spectral Range
2.0 to 2.6 µm
Supply Voltage
24 V DC ± 5%
Maximum Current Draw
100 mA
Maximum
-CB AND -CRT models: 900 Ω (4 to 29 mA output)
Alarm Relays (-CRT models)
2 x Single Pole Changeover alarm relays rated
24 V DC, 1 A, isolated 500 V DC
Cable Length (sensing head to electronics module)
1 m (standard), up to 30 m (optional)
Weight with 1 m Cable
390 g (approx.)
Cable Connections
Removable screw terminal blocks (see
Connections). Conductor size: 28 AWG to 18
AWG
Output Cable Gland
Suitable for cable diameters 3.0 to 6.5 mm

UNRESTRICTED
ENVIRONMENTAL
Sensing Head
Electronics Module
(without touch screen)
Electronics Module
(with touch screen)
Environmental Rating
IP65 (NEMA 4)
IP65 (NEMA 4)
–
Ambient Temperature
Range
0°C to 70°C
0°C to 60°C
0°C to 60°C
Relative Humidity
Maximum 95%
non-condensing
Maximum 95%
non-condensing
Maximum 95% non-
condensing
CE Marked
Yes
Yes
Yes
RoHS Compliant
Yes
Yes
Yes
ELECTROMAGNETIC COMPATIBILITY STANDARDS:
The OS-MINI22 series conforms to EMC Directive EN61326-1:2006 (Electrical equipment for
measurement, control and laboratory use –Industrial) as well as industrial standards for electromagnetic
immunity and emissions.
MODEL NUMBERS
Series
Field of View
Measurement Temperature
Range
Output and Interface
OS-MINI22
SN151
PT
CB
CRT
BB
BRT
SN251
SN751
SNCF
MT HT

UNRESTRICTED
OUTPUT, INTERFACE, EMISSIVITY ADJUSTMENT DETAILS
OUTPUT AND INTERFACE (OS-MINI and OS-MINI22)
OS-MINI Model
OS-MINI22 Model
Details
-MA
-CB
4 to 20 mA output, no touch screen
-MA-R-D
-CRT
4 to 20 mA output and two alarm relay outputs, with touch
screen
-C4
-BB
RS485 Modbus output, no touch screen
-C4-R-D
-BRT
RS485 Modbus output and two alarm relay outputs, with touch
screen
EXAMPLE: OS-MINI 302-CT-C4-R-D
Series
Sensing Head
Operating
Temperature
Optics
Temperature Range
Output and Interface
OS-MINI
MA 0°C to 60°C
302 30:1
divergent
CT configurable
within the limits:
-20 to 1000 °C
C4-R-D RS485
Modbus output and two
alarm relay outputs, with
touch screen
EXAMPLE: OS-MINI22-SN251-MT-BRT
Series
Field of View
Measurement
Temperature Range
Output and Interface
OS-MINI22
SN251 25:1
divergent optics
MT 250°C to 1000°C
BRT RS485 Modbus output and two
alarm relay outputs, with touch screen
-CB models: Fixed 4 to 20 mA output scale (e.g. -MT: 250°C @ 4 mA, 1000°C @ 20 mA)
-CRT models: 4 to 20 mA output is configurable within this range.
-BB and -BRT models: Digital output, full temperature range
000
0
1
200
00
4
0
45
00
1
0
25
PT
MT
HT
MEASUREMENT TEMPERATURE RANGE (°C)

UNRESTRICTED
EMISSIVITY ADJUSTMENT (-MA and -CB MODELS)
The emissivity setting on OS-MINI with MA output models may be adjusted via two rotary switches inside
the electronics box. To adjust the emissivity setting:
1. Set the left switch to the first digit after the decimal point (0.1).
2. Set the right switch to the second digit after the decimal point (0.01).
To enter an emissivity setting of 1.00, set both switches to 0. The minimum emissivity setting is 0.2. If a
lower emissivity setting is selected, the sensor will default to an emissivity setting of 0.95.
For example:
Left switch
Right switch
Emissivity setting
6
3
0.63
0
0
1.00
TOUCH SCREEN (-MA-R-D, -C4-R-D, -CRT AND -BRT MODELS)
The optional backlit touch screen interface mounted in the lid of the electronics module provides a large,
bright display of the measured temperature, as well as options for full configuration of the sensor. The graph
view shows the history of the measured temperature.
In alarm conditions, the display changes color to provide an immediate and obvious alarm indication. Alarm
modes and levels can be configured via the touch screen.
TOUCH SCREEN SPECIFICATIONS
Touch Screen Display Format
2.83” (72mm) resistive touch TFT, 320 x 240
pixels. backlit
Configurable Parameters
Temperature range, temperature units. Emissivity
setting, reflected energy compensation, alarms,
signal processing, Modbus address (-BRT
models), date and time, data logging
Temperature Units
°C or °F
Temperature Resolution
0.1°
Alarm Configuration
Two alarms with adjustable level, individually
configurable as HI or LO. Alarm 2 can be set to
target temperature or sensing head internal
temperature.
Signal Processing
Average, peak hold, valley hold, minimum,
maximum

UNRESTRICTED
OS-MINIUSB SPECIFICATIONS
The OS-MINIUSB is a simple, compact infrared temperature sensor with USB communications. It measures
the surface temperature of a variety of materials without contact.
The included software is intuitive and easy to use, and the open Modbus protocol allows users to connect
directly to the sensor using software of their own design.
The sensor’s rugged construction makes it ideal for benchtop, laboratory and education applications.
GENERAL
Accuracy
±1% of reading or ±1ºC whichever is greater
Repeatability
± 0.5% of reading or ± 0.5ºC whichever is greater
Emissivity
0.2 to 1.0
Response Time, t90
125 ms (90% response)
Spectral Range
8 to 14 µm
Supply Voltage
5 V DC (provided by USB)
Supply Current
50 mA max.
VIRTUAL COM PORT
Baud Rate
9600 baud*
Format
8 data bits, no parity, 1 stop bit *
Protocol
Modbus over Serial Line
*Other configurations available upon request
CONFIGURATION
Configuration Method
Via USB using included Windows software or Modbus
Configurable Parameters
Emissivity Setting, Averaging, Reflected Energy Compensation
MECHANICAL
Construction
Stainless Steel
Dimensions
18 mm diameter x 45 mm long (excluding cable gland)
Thread Mounting
M16 x 1 mm pitch
Cable Length
1 m standard, longer cable available to order
Weight with 1 m Cable
85 g
ENVIRONMENTAL
Environmental Rating
IP65
Ambient Temperature
0ºC to 75ºC
Relative Humidity
95% max. non-condensing

UNRESTRICTED
MODEL NUMBERS
Field of View
Model Number
2:1
OS-MINIUSB-SN21
20:1
OS-MINIUSB-SN201
OPTICAL CHART
The optical chart below indicates the nominal target spot diameter at any given distance from the sensing
head and assumes 90% energy.

UNRESTRICTED
USER INTERFACE (OS-MINI AND OS-MINI22)
Default View
Temperature View
Displays a large indication of the measured temperature. The background turns
bright red when an alarm is activated.
Setting
Temperature
Units
Selecting
Displayed
Temperature
Press “°C” to switch to °F and vice versa. The units are changed throughout the
interface.
Press the temperature display to select which reading is shown: Filtered Temp
The measured temperature, with averaging and hold processing. This temperature
is output by the sensor on the 4 to 20 mA output (-CB and -CRT models).
Average Temp
The measured temperature with averaging but without hold processing.
Unfiltered Temp
The unprocessed measured temperature. MicroSD Card status.
This icon is displayed when an SD card is inserted, and flashes when data logging
is in progress.
This icon is displayed when scheduled data logging is enabled and has yet to
begin.
List View
Displays a list of the measured temperatures, alarm state and data logging state.
Filtered Temp: The measured temperature, with averaging and hold processing.
Unfiltered Temp: The unprocessed measured temperature.
Average Temp: The Unfiltered Temperature averaged over the period specified in
“Output Processing”.
Maximum Temp: The highest temperature measured during the hold period, with
averaging.
Minimum Temp: The lowest temperature measured during the hold period, with
averaging.
Sensor Temp: The internal temperature of the sensing head.
Reflected Temp: The reflected energy compensation temperature, as specified in
“Emissivity and Compensation”.

UNRESTRICTED
Lock/Unlock
Prevents settings being changed via a four-digit numerical code.
Change Password
Enter, confirm and save a new four-digit code.
Start/Stop Logging
Manually begins or ends data logging (requires MicroSD Card, available separately).
If Scheduled Start is enabled in Settings > Data Logging, then logging cannot be
started manually.
To manually start logging, you must first disable Scheduled Start.
Graph
Displays the recent history of the Filtered Temperature and the Sensor Temperature.
To scroll backwards and forwards in time, touch the graph and drag it. The graph
stores the most recent 24 hours of temperature data.
Reset Graph
Clears and restarts the graph.
Real-Time Scrolling View
Returns the graph to the real-time scrolling view, showing the most recent
measurements.
Acknowledge Alarms
Switches the relay outputs for triggered alarms to their normal, untriggered state. The
background of the Temperature View, List View and Graph View will stay red, and the
alarms will not be triggered again, until the alarms are reset (see “Alarms” below).
Alarms can be acknowledged when the display is locked.
Settings
Access the configuration parameters. Press Apply to save the settings or Exit
to leave the screen without saving.

UNRESTRICTED
USER INTERFACE SETTINGS (OS-MINI AND OS-MINI22)
Date & Time
Change the date and time for data logging purposes. The clock is reset when the
power is cycled unless a battery is fitted.
Output Processing
Averaging
Period
Hold Mode
Hold Period
Set the time, in seconds, over which the measured temperature is averaged. Note:
averaging prevents the sensor from following rapid temperature changes. Minimum: 0
(no averaging). Maximum: 60.
Peak
The sensor holds the maximum temperature steady for the Hold Period. After this, the
sensor responds normally. If the sensor detects a higher temperature, it holds this
temperature steady for the Hold Period.
Valley
Similar to Peak Hold mode except that the sensor outputs the minimum detected
temperature steady for the Hold Period.
Off
Disables hold processing.
Set the time, in seconds, for the sensor to hold the temperature as above.
Minimum: 0 (no hold processing). Maximum: 1200.
Data Logging
Sample
Period
Number of
Samples
Enable
Scheduled
Start
Date and
Time
The time, in seconds, between samples. Minimum: 1. Maximum: 86,400 (1 day).
The number of samples to collect before logging stops. Minimum: 0 (continuous
logging). Maximum: 86,400 (1 day of data if Sample Period = 1 second).
The sensor begins logging at the Date and Time specified. Logging can also be
started and stopped manually.
The date and time for scheduled logging to start.

UNRESTRICTED
Emissivity and Compensation
Emissivity
Setting
Enable
Reflected
Energy
Compensation
Reflected
Temperature
Enter the emissivity of the target. Target emissivity can be determined experimentally
or estimated using an emissivity table. For more information, contact Calex. Minimum:
0.2. Maximum: 1.0.
If enabled, compensates for errors caused by reflected energy from hotter or colder
objects.
Enter the temperature of the surroundings of the target for Reflected Energy
Compensation. Minimum: -20°C. Maximum: 1000°C.
4 to 20 mA Output (MA-R-D models)
Set the temperature range limits for the 4 to 20 mA output.
Temperature
at 4 mA
Temperature
at 20 mA
Please note
The lower temperature range limit. Minimum: -20°C. Maximum: 900°C.
The upper temperature range limit. Minimum: 80°C. Maximum: 1000°C.
The difference between the temperatures at 4 mA and at 20 mA must be at least
100°C. The temperature at 20 mA must be greater than the temperature at 4 mA.
Modbus Address (C4-R-D models)
Modbus
Address
The current Modbus address of the sensor is displayed. Enter a new address, then
press Apply to save it to the sensor. Cycle the power to use the new address.
Minimum: 1. Maximum: 247.
Alarms
Configure the settings for Alarm 1 and Alarm 2 separately and configure alarm logging
settings.
Manually Reset Alarms
If an alarm has been triggered, allows both alarms to be triggered again. Alarms will not
be triggered again until they are reset, either automatically or manually.

UNRESTRICTED
ALARM SETTINGS (OS-MINI AND OS-MINI22)
Alarm 1 and Alarm 2
Alarm Set Point
Hysteresis
Filtered
Temperature or
Sensor
Temperature
(Alarm 2 only)
Alarm Type
Reset
The temperature at which the alarm is triggered. Minimum: -20°C. Maximum: 1000°C.
The temperature difference between the Alarm Set Point and the reset
temperature. Hysteresis is only used when Automatic Reset is enabled. Please
see the diagrams below for more information Minimum: 0°C (hysteresis
disabled). Maximum: 1000°C.
Select the temperature monitored by Alarm 2.
High
The alarm is triggered when the temperature rises above the Alarm Set Point.
Low
The alarm is triggered when the temperature drops below the Alarm Set Point.
Off
The alarm is disabled.
Automatic
The alarm is acknowledged and reset automatically when the temperature reaches
the reset temperature (see Hysteresis). It can also be acknowledged or reset
manually.
Manual
The alarm is acknowledged by pressing Acknowledge on the Temperature View
or List View and reset by pressing Reset on the Alarms screen.
Alarm Logging
Alarm events can be logged to the MicroSD Card. Alarm log files and settings are
independent from Data Logging.
Log Trigger
Time
Log Data
While
Triggered
Log
Acknowledge
Time
Log Reset
Time
The time that an alarm is triggered will be logged.
Data logging will start when an alarm is triggered. 1 sample is logged per second.
Logging stops when both alarms are reset.
The time that the alarm is acknowledged will be logged.
The time that the alarm is reset will be logged.

UNRESTRICTED
ALARM OPERATION WITH HYSTERESIS & AUTO. RESET (OS-MINI & OS-MINI22)
DATA LOGGING (-MA-R-D, -C4-R-D, -CRT, -BRT MODELS)
The OS-MINI and OS-MINI22 can be used as standalone data loggers. OS-MINI models MA-R-D and C4-
R-D as well as OS-MINI22 models -CRT and -BRT include a MicroSD card slot for data logging, which can
be configured via the touch screen interface. The user can select the sample rate and the number of
samples to be taken and schedule the data logging to start at a certain time.
With a 2 GB card, the user can store 28.4 million readings, which provides almost 1 years’ worth of data at
the fastest possible sample rate of 1 per second. Data is stored on the MicroSD card in .csv format and can
be viewed and edited easily using spreadsheet software. A MicroSD card with SD card adapter is available
as an optional accessory.
The MicroSD card slot and battery holder are located on the touch screen circuit board in the lid of the OS-
MINI. Readings are time and date stamped using the sensor’s internal clock. The clock is reset when the
power is disconnected, or it will continue if the optional battery is fitted.
DATA LOGGING SPECIFICATIONS
Data Logging Interval
1 to 86,400 seconds (1 day)
MicroSD Card
Max. capacity: 2 GB (not included)
Internal Clock Battery
1 x BR 1225 3V (not included)
Variables Logged
Target temperature, sensing head temperature, electronics module
temperature, max, min, average, emissivity setting, reflected energy
compensation temperature
File Format
.csv
Configurable Parameters
Sample period, number of samples, scheduled start date and time
Modbus address range
1 to 247
USING THE OS-MINI OR OS-MINI22 AS A DATA LOGGER
1. Insert a MicroSD card into the holder on the circuit board inside the lid of the electronics module.
2. To retain the date and time when the unit is switched off, fit a battery to the holder on the circuit board
inside the lid.
3. Replace the lid and connect the sensor power supply.
4. To set the number of samples to be logged, the time period between samples, and, if required, to
schedule data logging to automatically start, press to access the Settings menu, then press to
access the Data Logging options.
5. To save data logging settings, press
6. To manually start data logging, press on the Temperature View or List View.
7. While logging is in progress, the logging icon flashes on the Temperature View and List View.
8. To stop data logging, press

UNRESTRICTED
9. To transfer data to a computer, remove the MicroSD Card from the sensor, insert the card into the SD
Card adapter (supplied with MicroSD Card, accessory model MSD) and insert the adapter into an SD
Card reader.
Note: MicroSDHC Cards are not compatible with the OS-MINI22.
INSTALLATION OF MICROSD CARD AND BATTERY
DATA LOG FILES
Data is saved to the MicroSD Card in .csv format. This file format can be opened or imported by
spreadsheet software such as Microsoft Excel.
A new folder is created on the MicroSD Card for each day that data is logged.
A new log file is created every time logging is started. The start time is used as the file name.
MicroSD Card
Battery
(
use 1 x BR 1225 3V
)

UNRESTRICTED
SOFTWARE SETTINGS (FOR OS-MINIUSB)
SOFTWARE: OMEGACONFIG
System Requirements:
Windows (compatible with Windows Vista or newer)
USB 2.0 port
CD drive or Internet connection
Installation
NOTE: Do not connect the sensor until the software has been fully installed. The software will tell you when
to connect the sensor. This will ensure the USB driver for the sensor is installed properly.
1. Insert the provided CD or download OmegaConfig from www.omega.com.
2. The installer should run automatically from the CD (if not, browse to the appropriate drive and run
Setup.exe).
3. If you downloaded the software, unzip the files and run Setup.exe.
4. Follow the on-screen instructions.
Using the Software for the First Time
1. After the software has been installed, when prompted, connect the sensor to an available USB
2.0 port.
2. Start OmegaConfig using the desktop icon.
SOFTWARE FUNCTIONS
Temperature Units
Click °C or °F to switch between Celsius and Fahrenheit.
Graph
The graph is a scrolling chart of the measured temperature.
Unlocking the Software
The software settings are locked by default. To unlock the software, click the Unlock icon, enter the
password, then click the Unlock icon again.
The default password is 1234. This can be changed on the Lock/Unlock screen.
Settings
The sensor is fully configurable via the Settings menu.

UNRESTRICTED
Output Processing
The sensor has a response time of 125 ms. If this is too fast, or to minimize the effects of temperature
fluctuations or noise on the measurement, the averaging period can be set between 0 and 60 seconds.
Emissivity Setting
Enter the desired emissivity setting here. Emissivity can be set between 0.2 and 1.0.
For an accurate temperature reading, the sensor’s emissivity setting should match the actual emissivity of
the target surface.
Non-reflective non-metals, such as rubber, foods, thick plastics, organic materials and painted surfaces,
generally have a high emissivity, around 0.95. This is the default setting.
Bare, clean metal surfaces can have a very low emissivity, and are often difficult to measure accurately. If
possible, a measurable area of the surface should be painted or coated to reduce reflections and increase
the emissivity.
For more information about emissivity, contact Omega.
Reflected Energy Compensation
In most applications, the target surface has the same surroundings as the sensor (for example, it is in the
same room). In this case, Reflected Energy Compensation should remain disabled for an accurate
measurement.
However, if the sensor is positioned outside an oven or furnace, with the target surface inside, the reflection
of the hot furnace interior can affect the measurement. In this case, Reflected Energy Compensation should
be enabled, and set to the temperature inside the oven or furnace.
MODBUS OVER SERIAL LINE
INTERFACE
Baud rate 9600
Format 8 data, No parity, 1 stop
Reply delay (ms) 20
SUPPORTED FUNCTIONS
Read register 0x03, 0x04
Write single register 0x06
Write multiple register 0x10
Mask write register 0x17
The list below includes all available addresses:
R = Read, W = Write
Address
Length
(words)
Description
R/W
0x00
1
Sensor Type (16 for OS-MINIUSB, 17 for OS-MINIHUB)
R
0x01
1
Field of view
0 for 2:1; 1 for 20:1
R
0x02
2
Serial number
R
0x04
1
Modbus slave address
R/W
0x05
1
Reflected Energy Compensation 0 for Off;
1 for On
R/W