Omega OS-MINI User Manual

OS-MINI SERIES

Miniature Non-Contact Infrared

Temperature Sensors With

Separate Electronics Modules

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User’s Guide

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MADE IN UNITED KINGDOM

Servicing North America:

U.S.A.:

Omega Engineering, Inc., One Omega Drive, P.O. Box 4047

Stamford, CT 06907-0047 USA

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: [e-mail]

For Other Locations Visit omega.com/worldwide

omega.com [e-mail]

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.
WARNING: These products are not designed for use in, and should not be used for, human applications.

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The OS-Mini Series is a range of miniature non-contact infrared temperature sensors
with separate electronics modules.

All 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.

The optional touch screen interface provides temperature indication, alarms, sensor
configuration and data logging to MicroSD Card. The 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.

A choice 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.

SPECIFICATION

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, t

90

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 Aluminium

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)

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

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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

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-20

-LT

-MT

-HT

-XT

-CT

0 100

Fixed (e.g. -MT: 0°C @ 4 mA, 250°C @ 20 mA)

MA-R-D models: 4 to 20 mA output configurable within this range
C4-R-D models: Digital output, full temperature range

250 500 1000

MEASUREMENT TEMPERATURE RANGE (°C)

OUTPUT AND INTERFACE

MA 4 to 20 mA output, no touch screen
MA-R-D 4 to 20 mA output and two alarm relay outputs, with touch screen
C4 RS485 Modbus output, no touch screen
C4-R-D RS485 Modbus output and two alarm relay outputs, with touch screen

Diameter of target

spot measured versus

distance from sensing

head at 90% energy

Distance: Sensor to object (inches)

Distance: Sensor to object (mm)

11.9

45.2

78.6

0.5

1.8

3.1

0 19.7 39.4

0

11.9

0

500 1000

Spot Dia.

(inches)

Spot Dia.

(mm)

Spot Dia.

(inches)

Spot Dia.

(mm)

Distance: Sensor to object (inches)

Distance: Sensor to object (mm)

61.9

111.9

0.5

2.4

4.4

0 4 8

100 200

D:S 15:1D:S 2:1

212 152

Distance: Sensor to object (inches)

Distance: Sensor to object (mm)

11.9

36.9

61.9

0.5

1.5

2.5

0 19.7 39.4

0 500 1000

Spot Dia.

(inches)

Spot Dia.

(mm)

D:S 20:1

201

Spot Dia.

(inches)

Spot Dia.

(mm)

Distance: Sensor to object (inches)

Distance: Sensor to object (mm)

11.9

0.5

0

0

5.0

0.20

100

3.9

12.5

0.49

200

7.9

802

Distance: Sensor to object (inches)

Distance: Sensor to object (mm)

11.9

28.6

45.2

0.5

1.1

1.8

0 19.7 39.4

0 500 1000

Spot Dia.

(inches)

Spot Dia.

(mm)

D:S 30:1

302

FIELD OF VIEW

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.

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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

within the limits:

-20 to 1000 °C

C4-R-D

BRT

RS485
Modbus output and two
alarm relay outputs, with
touch screen

EMISSIVITY ADJUSTMENT (-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:

Set the left switch to the first digit after the decimal point (0.1).
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 and C4-R-D 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 colour 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” (72 mm) resistive touch TFT, 320 x 240 pixels, backlit

Temperature range, temperature units, emissivity setting,

Modbus address (-BRT models), date and time, data logging
Temperature Units
Temperature Resolution 0.1°

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

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USER INTERFACE

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.

Unltered Temp

The unprocessed measured temperature.
MicroSD Card status.

This icon is displayed when an SD card is inserted, and ashes 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.

Unltered Temp: The unprocessed measured temperature.

Average Temp: The Unltered Temperature averaged over the period
specied 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.

Reected Temp: The reected energy compensation temperature, as
specied in “Emissivity and Compensation”.