Projekt „ISSNBS“ Niš, November DAAD Deutscher Akademischer Austausch Dienst German Academic Exchange Service Facility Monitoring System with IEEE 1451 Interface Presented by: Marin Marinov, Todor Djamiykov, Georgi Nikolov, Dimitar Alexiev

Projekt „ISSNBS“ Niš, November DAAD Deutscher Akademischer Austausch Dienst German Academic Exchange Service 1. Introduction  Raising cost of energy in recent years.  Rapid growth and interest in building more sustainable and healthier buildings.  Interest in building facilities to be more energy efficient while also enhancing a facility’s indoor environmental quality (IEQ).

Projekt „ISSNBS“ Niš, November DAAD Deutscher Akademischer Austausch Dienst German Academic Exchange Service 1. Introduction  One of the major reasons for this shortcut occurs is that the quality, accuracy, and quantity of indoor environmental sensors that are typically used are not sufficient to successfully and cost effectively implement many of the energy efficiency approaches.  Even more often, information about the quality of the indoor environment is not sensed at all due to the cost of doing so, leading to situations where systems do not properly control, resulting in complaints, and subsequent disabling of the control approaches, and finally the loss of the expected energy savings.

Projekt „ISSNBS“ Niš, November DAAD Deutscher Akademischer Austausch Dienst German Academic Exchange Service 2. Requirements for a effective Facility Monitoring System  To enable effective energy savings applications such as demand controlled ventilation, a multi-parameter, multiple location, facility monitoring system should be implemented, which meets at the following requirements:  Facility Monitoring System Requirements: 1.Low first equipment and installation cost per parameter (for different locations), 2.Low maintenance and calibration costs, 3.Possibility for sensing a broad range of (indoor) environmental parameters & air contaminants, 4.Satisfactory accuracy and long term stability.

Projekt „ISSNBS“ Niš, November DAAD Deutscher Akademischer Austausch Dienst German Academic Exchange Service 3. Traditional Approaches to Sensing Air Parameters in a Facility  Indoor air parameters such as temperature, humidity, carbon dioxide and other parameters have traditionally been sensed by wiring individual air parameter sensors into a building management system (BMS).  This works fine for simple, inexpensive and reliable sensors such as temperature sensors. However, building monitoring requirements for indoor air parameters have increased so that many locations need to be monitored for other parameters such as:  relative humidity, dewpoint temperature,  carbon dioxide (CO2),  carbon monoxide (CO),  total volatile organic compounds (TVOCs),  odors, fine particles, etc.

Projekt „ISSNBS“ Niš, November DAAD Deutscher Akademischer Austausch Dienst German Academic Exchange Service 3. Traditional Approaches to Sensing Air Parameters in a Facility Problems with Traditional Sensor Approaches  High First Cost  Many sensors required for multiple parameter, multiple location sensing  First cost to sense many parameters quickly becomes too high  Commercial grade sensors often used, causing poor accuracy & reliability  High cost of installation & integration  A single hard wired Building Management System CO 2 or RH point can range from: € 500 to € 1000/pt.

Projekt „ISSNBS“ Niš, November DAAD Deutscher Akademischer Austausch Dienst German Academic Exchange Service 3. Traditional Approaches to Sensing Air Parameters in a Facility Problems with Traditional Sensor Approaches  High Operating Costs  Accuracy required often beyond sensor limits  Poor performance results = Lost energy savings  High maintenance cost  Every sensor needs periodic calibration (1x - 4x/yr)

Projekt „ISSNBS“ Niš, November DAAD Deutscher Akademischer Austausch Dienst German Academic Exchange Service 4. The IEEE 1451 Approach for Sensing Air Parameters IEEE 1451 Standard for Smart Transducer  The IEEE 1451 Standard provides a set of common interfaces for connecting sensors and actuators to existing instrumentation and control networks and lays a path for the sensor community to design systems for future growth.  It is intended to provide an easy upgrade path for connectivity of products from any manufacturer of transducers or networks.  The IEEE 1451 Standard can be basically viewed as a  software and  hardware oriented interfaces.

Projekt „ISSNBS“ Niš, November DAAD Deutscher Akademischer Austausch Dienst German Academic Exchange Service 4. The IEEE 1451 Approach for Sensing Air Parameters IEEE 1451 Standard for Smart Transducer  The software portion is an information model defining the behaviors of a smart transducer using object model approach and the path for network connectivity. This work has been completed and become the IEEE Standard.  The sensor usage crosses various industries, therefore the hardware portion of the IEEE 1451 Standard is divided into , , , etc.

Projekt „ISSNBS“ Niš, November DAAD Deutscher Akademischer Austausch Dienst German Academic Exchange Service TXdcr = Transducer (Sensor or Actuator) IEEE 1451 Standards - Another View Network-Capable Application Processor (NCAP) IEEE Common Object Model Any Network TxdcrA/D TEDS IEEE Digital, Point-to-Point Digital TII Interface Smart Transducer Interface Module (STIM) IEEE Distributed Multidrop Bus Txdcr Bus Interface Transducer Bus Interface Module (TBIM) IEEE Wireless Interface Wireless Transducer TxdcrA/D TEDS Mixed-Mode Transducer IEEE Analog + Digital TEDS Txdcr A/D TEDS IEEE P Common Function- ality & TEDS or 4 0

Projekt „ISSNBS“ Niš, November DAAD Deutscher Akademischer Austausch Dienst German Academic Exchange Service TEDS LabVIEW Library Broad-Based Industry Adoption 5. IEEE Mixed-Mode Transducer IEEE P Collaboration Backwards Compatibility Sensors Measurement Hardware Programming Software Communicate to End-Users System Integration Web Based Virtual TEDS database NI Plug & Play Sensor Partner Program Multi-Vendor Smart TEDS Sensors Development Kit TEDS LabVIEW Library Web Based Plug and Play Sensor Advisor NI Alliance Partners

Projekt „ISSNBS“ Niš, November DAAD Deutscher Akademischer Austausch Dienst German Academic Exchange Service 5. IEEE Mixed-Mode Transducer  The drive for transducers with built-in identification, manufacture data such as calibration, and extended functionality has increased sharply over the last years.  The transducer community, started the work on the IEEE standard to meet the demands and needs of the changing industry.

Projekt „ISSNBS“ Niš, November DAAD Deutscher Akademischer Austausch Dienst German Academic Exchange Service 5. IEEE Mixed-Mode Transducer  The main objectives of the proposed standard are to:  Enable plug and play at the transducer level by providing a common communication interface compatible with conventional transducers.  Enable and simplify the creation of smart transducers.  Facilitate the support of multiple networks.  Make a bridge between the conventional transducers and the networked transducers.

Projekt „ISSNBS“ Niš, November DAAD Deutscher Akademischer Austausch Dienst German Academic Exchange Service 5. IEEE Mixed-Mode Transducer Basic Architecture IEEE Mixed-Mode Communication Interface (MMI) and Transducer Electronic Data Sheet (TEDS)

Projekt „ISSNBS“ Niš, November DAAD Deutscher Akademischer Austausch Dienst German Academic Exchange Service 5. IEEE Mixed-Mode Transducer IEEE Transducer Electronic Data Sheet (TEDS) (Dot 4 TEDS)  UUID (Universal Unique Identifier)  Supplied by EEPROM (DS2433) manufacturer (6 bytes)  Basic TEDS (8 bytes)  Model Number (15 bits)  Version Letter (5 bits, A-Z)  Version Number (6 bits)  Manufacturer ID (14 bits)  Serial Number (6 bits)  Manufacturer’s TEDS  Sensor type and calibration parameters (16 bytes)

Projekt „ISSNBS“ Niš, November DAAD Deutscher Akademischer Austausch Dienst German Academic Exchange Service 6. IEEE Gas Sensors Implementation Basic Architecture

Projekt „ISSNBS“ Niš, November DAAD Deutscher Akademischer Austausch Dienst German Academic Exchange Service 6. IEEE Gas Sensors Implementation System overview  Prototype based on an 8-bit microcontroller (PIC16F87х) from Microchip  TEDS – 4k EEPROM (DS2433)  Main advantages :  Single power supply (+5 /12 V),  Reduced power consumption,  Low cost,  Self-calibration capability.

Projekt „ISSNBS“ Niš, November DAAD Deutscher Akademischer Austausch Dienst German Academic Exchange Service 6. IEEE Gas Sensors Implementation Plug-in Module as IEEE – Class 2 Multi-Wire Gas Sensor

Projekt „ISSNBS“ Niš, November DAAD Deutscher Akademischer Austausch Dienst German Academic Exchange Service 6. IEEE Gas Sensors Implementation Signal conditioner  The signal conditioning circuit (for the sensor resistance) is based on a  voltage divider connected to the ADC microcontroller input through a low-pass filter and  amplifier featuring a high input impedance.

Projekt „ISSNBS“ Niš, November DAAD Deutscher Akademischer Austausch Dienst German Academic Exchange Service 6. IEEE Gas Sensors Implementation Basic microcontroller module

Projekt „ISSNBS“ Niš, November DAAD Deutscher Akademischer Austausch Dienst German Academic Exchange Service 6. IEEE Gas Sensors Implementation Microcontroller module with differentt Plug-in modules

Projekt „ISSNBS“ Niš, November DAAD Deutscher Akademischer Austausch Dienst German Academic Exchange Service Conclusion  Detection of gases or vapors in air is becoming important mainly in the context of energy efficiency, safety and environment control.  In the last 10 years a great effort is applied to realize low-cost, compact instruments that can detect the presence of chemical compounds and pollutants.  Embedded with a microcontroller unit the smart sensor have much more built-in intelligence over the traditional sensors. So they can perform more intelligent functions such as:  Self-identification,  Self adaptation,  Self-calibration etc.

Projekt „ISSNBS“ Niš, November DAAD Deutscher Akademischer Austausch Dienst German Academic Exchange Service Conclusion  One of the most attractive advantages that a smart sensor offers is the networking capability defined by the IEEE 1451 smart transducer interface family of standards.  One of the basic aims of this standards is to support the implementation of plug and play functionality at the sensor/actuator level, standardizing data structures and communication.  The development of a gas sensor system with inter-changeable sensor heads which can be used with a variety of sensor technologies was presented.  By the implementation IEEE TEDS for automatic configuration of the sensor heads was used.

Projekt „ISSNBS“ Niš, November DAAD Deutscher Akademischer Austausch Dienst German Academic Exchange Service ACKNOWLEDGMENT The support of  Contract # 09NI NIS - TU Sofia and  AiF Contract # is acknowledged.