Vaisala AQT400 User Manual
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Vaisala AQT400 User Manual

Air quality transmitter
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M211930EN-A
User Guide
Air Quality Transmitter
AQT400

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Summary of Contents for Vaisala AQT400

  • Page 1 M211930EN-A User Guide Air Quality Transmitter AQT400...
  • Page 2 This product contains software developed sold or disclosed to a third party without by Vaisala or third parties. Use of the prior written permission of the copyright software is governed by license terms and holder. Translated manuals and translated...

  • Page 3: Table Of Contents

    Table of Contents Table of Contents About This Document..................5 1.1. Version Information....................5 1.2. Documentation Conventions................5 Product Overview....................7 2.1. Introduction to AQT400..................7 2.2. Safety........................8 2.2.1. ESD Protection....................9 2.3. Regulatory Compliances..................9 System Functional Description..............11 Installation......................13 4.1.
  • Page 4 AQT400 User Guide M211930EN-A Index..........................45 Technical Support......................47 Warranty...........................47 Recycling.......................... 47...
  • Page 5 List of Figures List of Figures Figure 1 Structure of AQT410 .....................8 Figure 2 Pin-out of M12 Connector...................14...
  • Page 6 AQT400 User Guide M211930EN-A List of Tables Table 1 Document Versions....................5 Table 2 List of parameters....................22 Table 3 CSV Output Format.....................25 Table 4 Modbus Function Codes..................25 Table 5 Modbus Register Addresses................26 Table 6 Troubleshooting AQT400...................31 Table 7 Measuring Specifications...................33 Table 8 Gas Measuring Specifications................33...

  • Page 7: About This Document

    Chapter 1 – About This Document 1. About This Document 1.1. Version Information This document provides information about the installation, operation, and maintenance of Vaisala Air Quality Transmitters AQT400. Table 1 Document Versions Document Code Date Description M211930EN October 2016 First version of this manual.
  • Page 8 AQT400 User Guide M211930EN-A Indicates that you need to take some notes during the task.

  • Page 9: Product Overview

    AQT400 is enclosed in an IP65-rated weatherproof casing and can be installed outdoors. The units are compact but robust with no moving parts and low power consumption. AQT400 can be used in conjunction with a PC, data logger, or other device. The following features and components are available in AQT410 and AQT420: •...

  • Page 10: Safety

    AQT400 User Guide M211930EN-A Figure 1 Structure of AQT410 M12 connector Sensor elements (four sensors per unit) Main electronics board Combined temperature and humidity sensor Radiation shield Integrated pressure sensor 2.2. Safety This product has been tested for safety. Note the following precautions: CAUTION! Do not exceed the specified input voltage range.

  • Page 11: Esd Protection

    Chapter 2 – Product Overview 2.2.1. ESD Protection Electrostatic Discharge (ESD) can damage electronic circuits. Vaisala products are adequately protected against ESD for their intended use. However, it is possible to damage the product by delivering electrostatic discharges when touching, removing, or inserting any objects in the equipment housing.
  • Page 12 AQT400 User Guide M211930EN-A...

  • Page 13: System Functional Description

    Chapter 3 – System Functional Description 3. System Functional Description The gas measuring technology in AQT400 is based on proprietary advanced algorithms and electrochemical technology. The sampled gas causes a reduction or oxidation reaction in an electrochemical cell. Both reactions create a weak electric current. The electric current is directly dependent on the volume of measured gas.
  • Page 14 AQT400 User Guide M211930EN-A...

  • Page 15: Installation

    To reduce the build-up of deposits, handle the unit with lint-free gloves and remove all grease from the surface after the installation Vaisala recommends to use the installation kit to install both models onto a mast or a wall. 1. Fix AQT400 to a mounting plate with three M3 screws.

  • Page 16: Connecting Cables

    Only use the recommended cable types and lengths. AQT400 uses 8 ... 30 V direct-current voltage. Use a power source that complies with this voltage. The power source must be able to supply at least 5 W, although AQT400 normally uses less power than that.

  • Page 17: Switching On Power Supply

    Chapter 4 – Installation RS-232 Serial Interface The RS-232 interface is used to control AQT400 either with a command line interface or with AQT Configuration Tool. Use the following settings: • 115200 bps • 8N1 (8 data bits, no parity, one stop bit) •...
  • Page 18 AQT400 User Guide M211930EN-A...

  • Page 19: Measurements

    5. Measurements 5.1. Stabilization Period When AQT400 is switched on, let the unit stabilize for at least 24 hours before using the measurement results. To ensure optimal measuring accuracy, Vaisala recommends a stabilization period of 48 hours. The units take measurements during the stabilization period, but they are marked as invalid.
  • Page 20 AQT400 User Guide M211930EN-A...

  • Page 21: Configuration And Operation

    Chapter 6 – Configuration and Operation 6. Configuration and Operation You can view the measuring data and change the settings of AQT400 through the RS-232 serial interface. Vaisala recommends to use a graphical user interface AQT Configuration Tool and a USB/RS-232 adapter.
  • Page 22 AQT400 User Guide M211930EN-A 3. To retrieve the measurements, select the display options: • To retrieve a single measurement, select Single. • To retrieve continuous measurements, select Continuous and define the interval in seconds. • Select the measurement units, pump mode, measurement mode (single or continuous) and measurement interval in seconds.

  • Page 23: Connecting To Management Console

    Chapter 6 – Configuration and Operation 8. To view the measurements in graphical form, click Graph. To view one measurement at a time or all measurements simultaneously, or to compare the measurements with one another, select the appropriate variables on the left-hand side of the window. To clear the latest measurements, click Clear.

  • Page 24: Using General Commands

    AQT400 User Guide M211930EN-A 6.4. Using General Commands Command Description Parameters date Prints current date and time. [date] sets a new date and time in ISO8601 format (for example, 2015-01-01T12:15:00) initconf Initializes the transmitter to default --really is a mandatory parameter settings.
  • Page 25 Modbus baud rate (4800 ... 115200 bps) rs485_mode Modbus in use (0 = ASCII CSV, 1 = Modbus ASCII, 2 = AQT interconnect, 3 = Vaisala WXT) co_zero CO zero correction (-10000 … 10000 ppb) co_span CO span correction (1 … 255 %) no2_zero zero correction (-10000 …...
  • Page 26 AQT400 User Guide M211930EN-A...

  • Page 27: Data Formats

    To use the RS-485 port in Modbus mode, set parameter rs485_mode to 1. The device complies with Modbus ASCII standard, but does not support Modbus RTU mode. For full specifications, see http://www.modbus.org/. AQT400 supports the following Modbus function codes: Table 4 Modbus Function Codes Command...

  • Page 28: Table 5 Modbus Register Addresses

    M211930EN-A Command Function Code Description regwrite 0x06 Writes single register The following register addresses are available in AQT400. Note that all registers may not be available on your device. Table 5 Modbus Register Addresses Register address Data Range Description 0x00 Read only, in ppb...
  • Page 29 Chapter 7 – Data Formats Register address Data Range Description 0x1B Read only, 0 or 1 Measurement validity 0 = not valid 1 = valid 0x1C Read only, 0 or 1 Temperature units 0 = ºC 1 = ºF 0x1D Read only, 0xFFFF Sensor configuration word 1 0x1E...
  • Page 30 AQT400 User Guide M211930EN-A...

  • Page 31: Maintenance

    8.2. Factory Calibration To measure the four gases, AQT400 includes four integrated sensor elements. The sensors have been calibrated at the factory and must be recalibrated every 12 ... 24 months, depending on the gas type. To have the sensors replaced and calibrated, contact Vaisala technical support.
  • Page 32 AQT400 User Guide M211930EN-A...

  • Page 33: Troubleshooting

    Chapter 9 – Troubleshooting 9. Troubleshooting Before you return a faulty product to Vaisala, do the following: • Check all cables and connectors for continuity, bad contacts, or corrosion. • If failure persists, contact Vaisala technical support. If you have to return the unit, contact Vaisala technical support.
  • Page 34 AQT400 User Guide M211930EN-A...

  • Page 35: Technical Data

    Chapter 10 – Technical Data 10. Technical Data 10.1. AQT410 Specifications Table 7 Measuring Specifications Property Description/Value -40 ℃ ... +85 ℃ (-40 ℉ ... 185 ℉) Temperature range 0.1 ℃ (℉) Temperature resolution ±0.3 ℃, repeatability ±0.1 ℃ Temperature accuracy Humidity range 0 ...

  • Page 36: Table 9 Electrical Specifications

    AQT400 User Guide M211930EN-A Table 9 Electrical Specifications Property Description/Value Operating voltage 8 ... 30 VDC Power consumption Typically 0.5 W, maximum 2 W Table 10 Environmental Specifications Property Description/Value -30 ℃ ... +50 ℃ (-22 ℉ ... 122 ℉) Operating environment 15 ...

  • Page 37: Aqt420 Specifications

    Chapter 10 – Technical Data 10.2. AQT420 Specifications Table 13 Measuring Specifications Property Description/Value -40 ℃ ... +85 ℃ (-40 ℉ ... 185 ℉) Temperature range 0.1 ℃ (℉) Temperature resolution ±0.3 ℃, repeatability ±0.1 ℃ Temperature accuracy Humidity range 0 ... 100 %RH (non-condensing) Humidity resolution 0.1 %RH Humidity accuracy...

  • Page 38: Table 15 Particle Measuring Specifications

    AQT400 User Guide M211930EN-A Table 15 Particle Measuring Specifications Property Description/Value Particle range 0.3 ... 20 μm (spherical equivalent) Measurement range PM2.5: 0 ... 2000 µg/m PM10: 0 ... 5000 µg/m Resolution 0.1 μg/m Response time <60 s Sampling interval 1 ... 1440 minutes...

  • Page 39: Table 19 Mechanical Specifications

    Chapter 10 – Technical Data Table 19 Mechanical Specifications Property Description/Value Dimensions (H × W × D) 185 × 128 × 128 mm (7.3 × 5.0 × 5.0 in) Weight 1.3 kg (2.8 lb) Enclosure material Anodized aluminium, stainless steel Power and data connector Standard 8-pin M12 male...
  • Page 40 AQT400 User Guide M211930EN-A...

  • Page 41: Appendix A: Performance Check

    Check AQT400 is designed for diffusion-based measurements. When doing a performance check, use applicable accessories and let the instrument stabilize first. Vaisala recommends using a special calibration adapter, which allows direct connection to the reference gas supply. 1. Let the instrument stabilize at least 36 hours in a stable environment.
  • Page 42 AQT400 User Guide M211930EN-A 3. Start the flow of gas to AQT400. Use half of maximum values (5 ppm for CO and 1 ppm for other gases) and keep relative humidity the same as with zero air (±5 %RH). • Direct method uses gas bottles with a known concentration (for example, 1 ppm or 5 ppm).
  • Page 43 7. Use the write --really command to save the new adjustments. 8. Use the show health command to check the health status of AQT400. The output is a percentage value (0 ... 100 %). If the health value is below 20, contact Vaisala technical...
  • Page 44 AQT400 User Guide M211930EN-A...

  • Page 45: Appendix B: Accessories

    Appendix B – Accessories Appendix B. Accessories For a list of accessories, contact Vaisala Technical Support at helpdesk@vaisala.com.
  • Page 46 AQT400 User Guide M211930EN-A...
  • Page 47 Index Index power supply..............15 problem report............31 accessories..............43 AQT Configuration Tool......... 19 safety................. 8, 9 serial interface calibration..............29 RS-232............14, 19, 21 compliance..............9 RS-485..............14 connector pin-out............ 14 settings..............19, 21 specifications AQT410..............33 data format AQT420..............35 ASCII mode............25 stabilization period..........17 Modbus mode............25 troubleshooting............31 ESD protection............
  • Page 48 AQT400 User Guide M211930EN-A...
  • Page 49 Technical Support Contact Vaisala technical support at helpdesk@vaisala.com. Provide at least the following supporting information: • Product name, model, and serial number • Name and location of the installation site • Name and contact information of a technical person who can provide further information on the problem For Vaisala Service Center contact information, see www.vaisala.com/servicecenters.
  • Page 50 AQT400 User Guide M211930EN-A...
  • Page 52 www.vaisala.com...

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