AST EL50 Manual de usuario

AST EL50

USER MANUAL

Accurate Sensors Technologies

Non-contact Infrared Pyrometers

We measure accurate temperature in extreme conditions

AST - Accurate Sensors Technologies

Misgav Industrial Park, Misgav 20173, Israel

Tel: +972-4-9990025, Fax: +972-4-9990031

Email: info@accuratesensors.com

Web: www.accuratesensors.com

Index

1. Chapter - 1

General information

2. Chapter - 2 ....................................................................................................................... 2

Introduction

2.1 Application, range and working principle

3. Chapter - 3 ....................................................................................................................... 3

Technical specification

4. Chapter - 4 ....................................................................................................................... 4

Setting at the instrument

4.1 Operation

4.2 Adjustment parameters

4.3 Connection diagram

4.4 Pin assignment

5. Chapter - 5 ....................................................................................................................... 7

Optics

5.1 Optical specification

5.2 Exchange of the Sensing Head

6. Chapter - 6 ....................................................................................................................... 8

Accessories

6.1 Electrical accessories

6.2 Mechanical accessories

7. Chapter - 7 ....................................................................................................................... 11

Software installation

7.1 Installation

7.2 Parameter in main screen

9. Chapter - 8 ....................................................................................................................... 18

Calculate spot size

10.Chapter - 9 ....................................................................................................................... 19

Serial communication protocol

....................................................................................................................... 1

We are pleased that you have chosen this high quality and highly efficient AST pyrometer for non-contact

temperature measurement.

Please read this manual carefully, step by step before performing any operation with the Pyrometer. It

contains all the necessary instructions for set up and operation of the pyrometer. When operating the instrument, it

is necessary to follow the general safety instructions.

1.1 Safety Measures

This section provides an overview about important safety regulations.

1.1.1 General

Each person working with the pyrometer must have read the user manual before operation. The Pyrometer

has only to be used for the purpose described in the manual.

1.1.2 Safety Precaution

The Pyrometer works only with a potential-free low voltage of range 24V DC. This voltage is not harmful for

the user.

1.1.3 Maintenance and use of Pyrometer

Pyrometer can be operated by the qualified person who has got instructions from the supervisor. It is

strongly prohibited to do technical modifications of the device without permission of the manufacturer.

1.1.4 Environmental Protection

The lens or its coating may contain harmful materials and hence it should not be disposed of with normal

waste.

1.1.5 Packaging and storage

Always use a shock-proof package for shipment of the pyrometer. It should be sealed to protect it against

humidity. Also protect the lens of the pyrometer with a cover. They should be stored at the temperature ranges from

-20° to +70° C.

1.1.6 Warranty

AST EL50 instruments have a warranty of two years from the invoice date. AST will replace defective parts,

which arises from design errors or manufacturing faults. In case, if pyrometer is opened, disassembled or modified

then the guarantees will loss.

AST does not accept liability for any damage or losses which might occur, including consequential damages

and financial losses, as a result of use of the equipment.

proprietary document to AST with permission for review and usage given only to the rightful owner of the

equipment with which this document is associated.

Chapter - 1

General Information

AST EL50 is specially designed highly accurate digital pyrometer in 4 wire technology with extended optical

head, inbuilt LCD & keypad for parameterization to provide high performance and low maintenance of non contact

temperature measurement in demanding industrial environment.

2.1 Application, Range and Working Principle

The AST EL50 pyrometers are especially designed for industrial purposes. They are suitable for high

temperature measurement ranging from 0°C to 800°C.

The AST EL50 are pyrometers with extended sensor head and equipped with a display which shows in

measuring mode the current temperature.The cable & optical head are unaffected by electromagnetically

interferences (e.g. induction) and can be used in ambient temperatures up to 70°C. The pyrometers are

equipped with a display which shows in measuring mode the current temperature. Additionally all parameters

can be read if they are changed via the integrated keys at the instrument. Via serial interface and the provided

software the temperature can be displayed and stored on a PC, parametrizing can also be done.

AST EL50 has response time of 20 msec. It has USB 2.0[RS-485/RS-232(Optional)].output Instrument can be

powered directly through USB without any external power supply. Emissivity, analog output sub range, response time

and Peak Picker, relay output, analog outputs, selection can be preset ex works or adjusted through available optional

software or via keypad.

The pyrometer temperature measurement method utilizes the fact that objects emit thermal radiation in an

amount that directly corresponds to their own temperature and surface emissivity.

The pyrometer sensor detects the amount of infrared radiation emitted by the measured object (target). The

infrared signal is analyzed and the temperature it represents is analyzed by built-in microprocessor.

The applications in which AST pyrometers can be used are:

ŸPlastic & rubber

ŸCeramic

ŸPaper

ŸTextile

ŸFluids

ŸOxide/Painted metal surface

ŸWood & glass industries

Chapter - 2

Introduction

Sensing Head

M20 x 1.0

Chapter - 3

Technical Specifications

Model AST EL50

Measured Temperatures Range

(Analog output sub range adjustable) 0 °C - 800 °C

Spectral Range 8.....14µm

Photodetector Type Thermopile

Distance to spot size ratio 2:1 or 15:1

Response Time 20msec adjustable upto 10s

Accuracy

Emmisivity

+/-1.5% of temperature reading or +2°C (Optical head should be

at constant ambient temperature)

0.1 …… 1 adjustable

Analog Output 4-20mA or 0-20mA or 0-10V or T/C K-type or J-type user selectable

Digital Output

Relay Output (Optional)

USB 2.0,[ RS - 485 / RS - 232 (Optional)]

1 Relay output with hysteresis 60 VDC/ 42 VACRMS, 0,4 A

Power Supply 24 V DC

0.1 K

Operating Temperature Range Electronic and optical head 0…..70 °C

Storage temperature

Resolution

-20 to +70 °C

Dimensions & weight

Protection class

112.5 x 82.5 x 33 (L x W x D), 600g

IP 65

Adjustable Parameters via Keypad /

software

Emissivity, Analog output, Address, Response time, Peak picker,

Analog output Sub Range.

Repeatability 0.1% of reading in °C +1°C

82.50

112.50 2 x 6 THRU Mounting Hole

Note : In case of T/C J/K type analog output target temperature should be greater than ambient temperature.

Chapter - 4

Setting at the instrument

User can power up the unit either by USB input or by using connection cable at 24V DC input. After power up

sensor starts an initializing routine for some seconds. After this the object temperature is shown in the display. User

has to remove the screw (mark USB in figure) to connect the unit with PC via USB cable.

4.1 Operation

The programming keys FUNC, UP and DOWN enable the user to set the device on-site. Normally, LCD shows

temperature or error. To view different parameter FUNC key is pressed repeatedly. To change values of parameters UP

& DOWN keys are used. After changing values in any parameter by UP & DOWN key finally FUNC key should be

pressed to save that value in device. If FUNC key is not pressed after changing parameter value than device will

automatically take the old value & device will start showing temperature. If any key is not pressed for more than 5 sec.

than device will automatically shows the temperature.

4.2 Adjustable parameters

Emissivity : It is the relationship between the emissions of a real object and the emission of a black body

radiation source at the same temperature. For a correct measurement it is necessary to

adjust emissivity. Emissivity depends on the surface condition of the material, the spectral

range of the pyrometer and the measuring temperature. Different material has different

emissivity ranging from 0.1 to 1.0.user can change emissivity by given keypad on the

instrument.

Set point : Instrument is equipped with a relay contact controlled by the measuring signal. The turn on

temperature of relay is adjusted within the measuring range. The relay contact is “OPEN”

below the adjusted value, it is “CLOSE” above it.

Hysteresis (Hyst.) : The relay contact close when temperature exceeds the set point. It opens only if the

temperature falls below a value which consists of set point and the adjusted hysteresis. It can

be adjusted from 2° to 20°C.

24V DC input, analog

& digital output cable

USB output

Sensor cable maximum

length 15 mtr.

Function key to select

different functions

Function keys for

parameter setting

LCD display for measuring

temperature and parameterization

Wall Mounting holes

Example : if set point value is 200°C and Hysteresis set to 10. Then relay operation as below mentioned:

1. Relay contact OPEN below 210°C temperature.

2. Relay contact CLOSE above 210°C temperature.

3. Once relay contact CLOSED than relay contact is OPEN's when temperature falls below 190°C.

Ana. Sub range LO : Analog sub-range is adjustable within the basic range, user can set lower analog sub-range

here.

Ana. sub range HI : User can set the analog sub-range higher value here. Minimum span between lower &

higher value is 51°C

Analog output : User can select the output from

Temp. Unit : User can select °C or °F unit.

Sensor address : For communicating with pyrometer via software users have to give a address. The address

may be 1 to 255.

Response time : The response time can be set from 20 msec to 10sec.

Picker : User can calculate a maximum “peak” temperature value from specified number stored real

temperature in the sensor memory. User can either on or off the picker.

Head temp. : It shows the temperature of head.

Internal temp. : It shows the internal temperature of pyrometer.

4.3 Connection diagram

4-20mA or 0-20mA or 0-10V or T/C K-type or J-type

Connection through USB cable

Accurate Sensors Technologies

AST

4.4 Pin assignment

Connector pin assignment:

Note : 1. For Analog output, DC supply (+24V DC) is must given to pyrometer first.

2. Pyrometer stabilization time is at least 15 minutes, when ambient temperature is changed.

Pin number Indication Descriptions

XGND RS-232 / RS-485 GND

YRx/D+ Rx(RS-232) / D+(RS-485)

ZTx/D- Tx(RS-232) / D-(RS-485)

Optional (RS-232 / RS-485) PCB Connection

Connector

Pin No. 1 Connector

Pin No. 7

USB Output

24V DC input analog

& digital output cable

Sensor cable

Pin No. Z

Pin No. Y

Pin No. X

Optional (RS-232 / RS-485)

Connection PCB

Connector

Pin No. 8 Connector

Pin No. 13

RL1-NO Relay terminal 1

6RL1-C Relay terminal 1

3Out mA(+) Analog output current (+)

20 V DC supply GND

1+24 V DC supply

5Out V/mV (+) Analog output voltage/T/C output (+)

4Out mA/V/mV (-) Analog output current/ /T/C output (-)voltage

Pin number Indication Colour Code

13 WWhite

10 GGreen

9RNot Connected

8OOrange - Earthing

12 BBrown

11 YYellow

Accurate Sensors Technologies

AST

The pyrometer measure temperature by receiving heat radiation, from the object, whose temperature has to be

measured. This heat radiation is passes through the lens to the sensor and is then converted to an electrical signal.

The farther the measured object is from the pyrometer, the larger the area that will be measured by the pyrometer.

Depending on customer need, the pyrometer is designed for different FOV. User has to select the FOV while ordering.

Contamination on lens will cause inaccurate temperature reading therefore air purge unit is used for sensor head.

Cleaning with dry cloth is sufficient for lens cleaning.

5.1 Optical specification

Chapter-5

Optics

*FOV mentioned on the pyrometer.

For example: If pyrometer FOV is 15:1, then spot size at 1500mm calculated as given below method except that

minium spot should be 6mm.

Installed Spot Size = Installed Working Distance

FOV

1500

== 100mm

6100 200 350 500

200 400 700 1000

2000

1000

FOV-2:1

614 27 47 67

200 400 700 1000

2000

133

FOV-15:1

5.2 Exchange of the Sensing Head

From factory side the sensing head has already been connected to the electronics and the calibration code has been

entered.

Entering of the Calibration Code

Every head has a specific calibration code, which is printed on the

head. For a correct temperature measurement and functionality of

the sensor this calibration code must be stored into the electronic box.

The calibration code consists of 4 blocks with 4 digit values.

Example:

For entering the code please press the Function Key and select PSW

option, then write 0011 at PSW by using UP & DOWN key and press the

Function Key to enter into calibration data of Sensing Head.

Now, the display shows 4 Digit of the first block (Block A) with UP and

DOWN key, value can be Change and press Function Key to save.

Switches to the next block and repeat same process for next Block.

3045

Block D

2085

Block C

1040

Block B

1040

Block A

Chapter - 6

Accessories

Power supply unit

(Reference no: 9000-02)

Temperature indicator

(Reference no: 9000-01)

6.1 Electrical Accessories

6.1.1 Power supply unit

6.1.2 Temperature display instrument

AST E 250/450 PL is powered by 24V DC (well stabilized ripple max

50mV).The input power supply is 110/230v AC check the polarity

before connecting the device.

To display the measured temperature 7 segment digital indicator is

used. Device has following specifications:

Power supply I/P : 85 to 265 V, AC/DC

Analog I/P : 4….20 mA

Retransmission : 4….20 mA

Power supply O/P : 24V, DC

Display : 4 Digits

Alarm : 2

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