Elgas EDT 101 Manual de usuario
1
Temperature transducer EDT 101
User manual
Rev. 6
December 2019
2
This document provides functional description, installation, configuration and operating
instructions for ELGAS EDT 101 temperature transducer with Modbus protocol. The
information in this document covers software revision 3.11.
Information in this document is subject to change without notice and does not represent a
commitment on the part of ELGAS, s.r.o. Improvements and/or changes in this manual or the
product may be made at any time. These changes will be made periodically to correct technical
inaccuracies or typographical errors.
3
Contents
1Introduction........................................................................................................................6
2Device overview..................................................................................................................7
2.1 Available versions................................................... Chyba! Záložka není definována.
2.2 Technical Description .................................................................................................7
2.3 Device specification....................................................................................................8
3Installation........................................................................................................................11
3.1 Mechanical Installation ............................................................................................11
3.2 Electrical installation ................................................................................................11
3.3 Cabling, grounding....................................................................................................12
3.4 Power Supply Requirements ....................................................................................13
4Modbus Communication Protocol ...................................................................................15
4.1 Modbus Protocol Overview......................................................................................15
4.1.1 Physical Communication Layer.............................................................................15
4.1.2 Transactions on Modbus networks ......................................................................15
4.2 Device Specific Features...........................................................................................16
4.2.1 Service Address.....................................................................................................16
4.2.2 Communication Buffer Length .............................................................................16
4.2.3 Response Time......................................................................................................16
4.3 Holding Registers Map..............................................................................................17
4.3.1 Holding Registers Map Overview .........................................................................17
4.3.2 Factory configuration section...............................................................................19
4.3.3 Service Configuration Section ..............................................................................20
4.3.4 User configuration section ...................................................................................20
4.3.5 Miscellaneous.......................................................................................................20
4.3.6 Measured variables ..............................................................................................20
4.3.7 Datalogger section................................................................................................22
4.3.8 Data types.............................................................................................................23
4.4 Discrete outputs map ...............................................................................................24
4.4.1 Overview of the discrete outputs map.................................................................24
4.4.2 Reset .....................................................................................................................24
4.4.3 Write EEPROM......................................................................................................24
4
4.4.4 Read EEPROM ...................................................................................................... 24
4.4.5 Stop measurement............................................................................................... 25
4.4.6 Start single measurement.................................................................................... 25
4.4.7 Start continuous measurement. .......................................................................... 25
4.4.8 Unlock user configuration section ....................................................................... 26
4.4.9 Unlock service configuration section................................................................... 26
4.4.10 Change password ............................................................................................. 26
4.5 Modbus function codes ........................................................................................... 28
4.5.1 Read multiple registers (03h)............................................................................... 28
4.5.2 Force single coil (05h) .......................................................................................... 29
4.5.3 Write multiple registers (10h).............................................................................. 30
4.5.4 Start measurement with mask (45h) ................................................................... 31
4.5.5 Synchronize datalogging (46h)............................................................................. 32
4.5.6 Erase data (47h) ................................................................................................... 33
4.5.7 Set slave address (48h) ........................................................................................ 34
4.6 Exception responses ................................................................................................ 36
5Related Publications......................................................................................................... 38
5
Abbreviations and terms
char
8-bit signed integer value
CRC
Cyclical Redundancy Check
dec
Decimal representation
EEPROM
Electrically erasable non-volatile memory
float
32-bit single precision floating point value
hex
Full scale
int
Hexadecimal representation
Modbus
16-bit signed integer value
MSB
The least significant byte
LSB
A vendor-neutral communication protocol intended for supervision and
control of automation equipment.
RS 485
The most significant byte
RTU
Standard for data transmission, where a balanced (differential)
transmission line is used in a multidrop configuration.
uchar
Remote terminal unit. One of two serial transmission modes of the Modbus
communication protocol.
uint
8-bit unsigned integer value
6
1 Introduction
Temperature transducer EDT 101 (hereinafter “transducer”) is a miniature precision device
intended for temperature measurement in applications which require a high precision and
ultra-low power consumption. The transducer has RS 485 digital interface, which makes it
ideal for use in modern digital systems.
The transducer is dedicated to connect with data loggers, gas-volume correction devices and
telemetric systems.
Regarding safety, the transducer is designed to comply with the EN 60079-11 as an intrinsically
safe device and is approved for potentially explosive atmospheres. The transducer is
manufactured and delivered in compliance with the following guidelines of the European
Parliament:
2014/34/EU relating to equipment and protective systems intended for use in potentially
explosive atmospheres
2014/30/EU relating to electromagnetic compatibility
Basic features
Ranges -25 .. +70°C or -40 .. +70°C
RS 485 digital interface, Modbus communication protocol
Ultra-low power consumption: 3 μA standby, 1 mA active, supply voltage from 2.8V
High accuracy: 0.2°C
Small size, rugged housing
Certified as explosion-proof with type of protection II1G Ex ia IIC T4 Ga
7
2 Device overview
2.1 Technical Description
Chyba! Nenalezen zdroj odkazů. shows functional diagram of the transducer. Temperature is
measured by platinum resistive sensor. The signal from the sensor is converted by a high-
resolution analog-to-digital converter into digital form and processed by the microcontroller.
Microcontroller digitally compensates the non-linearity of the sensor using calibration data.
The calibration data is stored in non-volatile EEPROM memory during transducer
manufacturing.
Temperature readout as well as all control functions are accessible via RS 485 interface. The
transducer is capable to measure the temperature on request or continuously in preset time
intervals and store values in its internal memory for later retrieval.
Analog-to-Digital
Converter
Voltage
Regulator
Microcontroller Driver / Receiver
RS485
EEPROM
Memory
Regulated
Power Supply
RS485
Bus
Power
Supply
Uref
Rn
Pt 1000
Uref
Rn
Pt 1000
Figure 1. Functional diagram of the transducer
Physically, the transducer consists of the temperature sensor mounted in stainless-steel stem
50 mm long and the cable. A cylindrical plastic case with electronics is integrated into the
cable.
200 64
17
5.7
50
Figure 2. Dimensional drawing of the transducer.
8
2.2 Device specification
Measurement ranges
Standard range: -25°C to +70°C
Extended range: -40°C to +70°C
Temperature sensor
Platinum resistive element Pt 1000 mounted in ANSI 316L stainless-steel stem, stem diameter:
5.7 mm, stem length: 50 mm standard
Measured media
Liquids and gases, chemically compatible with stainless-steel ANSI 316L
Accuracy
0.2°C within the full measurement range
Includes non-linearity, repeatability and long-term stability.
Electrical connection
Integral shielded cable 4 x 0.25 mm2length 2.6 m with external diameter between 5 to 7 mm.
Other lengths of cable on request. Cable shielding is not connected to the stainless-steel stem.
Power supply
The transducer requires external DC power supply. Transducer terminal voltage must be
between 2.8 to 5.0 V
Power consumption
Standby: 3 μA typical / 10 μA maximum
Measurement and communication: 0.8 mA typical / 4 mA maximum
Power consumption is not dependent on the supply voltage. Power consumption during the
communication depends on the bus impedance.
Start-up time
The transducer is ready to operate 20 ms after power supply is applied.
Communication interface
RS 485, 2-wire, half-duplex, minimum bus impedance 1.5 kΩ. Unterminated bus is
recommended for low-power consumption. Maximum wiring length is 100 m.
Communication protocol
9
Modbus RTU, speed 38400 bit/s, 1 start bit, 8 data bits, no parity, 1 stop bit. Standard functions
supported: Read holding registers (code 03h), Force single coil (code 05h) and Write holding
registers (code 10h). Non-standard functions with codes 45h, 46h, 47h, 48h are implemented.
Datalogging
The transducer is able to measure temprature automatically in regular intervals and store the
measured values in the memory to be retrieved from later on.
Measurement period: adjustable 125 ms to 512 s
Data memory capacity: 80 values
Time base accuracy: 100 ppm
Electric insulation
Resistance between the stem/cable shielding and signal or power supply wires is greater than
10 MΩ at 500 V AC.
Physical specifications
Dimensions: see chapter 2.1
Weight: 100 –150 g (depending on mechanical version)
Environmental specifications
Operating temperature: -40°C to +70°C as sandard
Storage temperature: -40°C to +85°C
Humidity: 0% to 95% relative, without condensation
Protection: IP 65
Vibrations: 10 g sinus 10-2000Hz, ČSN EN 60068-2-6 [3]
Electromagnetic compatibility
Complies with immunity requirements for industrial environments EN 61000-6-2 [2]
Explosion-proof design
10
Equipment with the “i” protection type (intrinsically safe equipment) in compliance with
EN 60079-0 [4] and EN 60079-11 [5]. The certificate registered under No. FTZÚ 18 ATEX 0142X
at the Physical-Technical Testing Institute Ostrava-Radvanice, notified body No. 1026.
Environment classification: Zone 1, 2 according to the EN 60079-14 [6]
Protection class: II1G Ex ia IIC T4 Ga
Safety descriptions:
Ui= 9.9 V
Ci = 2.65 μF
Li= 0 μH
Pi= 1.10 W for Ta<70°C
Tabla de contenidos
Manuales populares de Transductor de otras marcas
Mianyang Weibo Electronic
Mianyang Weibo Electronic WB Series Manual de usuario
ProMinent
ProMinent Dulcometer DMT Manual de usuario
MKS
MKS MicroPirani 925 Series Cómo utilizar
WIKA
WIKA WU-20 Manual de usuario
Alcatel Vacuum Technology
Alcatel Vacuum Technology BARATRON 622A Manual de usuario
Camille Bauer
Camille Bauer SIRAX CH-5610 Manual de usuario
