Instrumentation and Monitoring

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Instrumentation and Monitoring

• ES 96 Engineering Design
• 2/24/03
• Erin Aylward and Travis Beamish

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HOBO H8 Data Logger

• MODELS
• HOBO Temp
• HOBO Temp/External
• HOBO RH/Temp
• HOBO RH/Temp/Light/External (4)
• HOBO RH/Temp/2x External (3)

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Outline

• Data Logger (HOBO Unit) Specifications
• How to use the Logger (Boxcar Software)
• CO2 monitor
• Flow rate monitor
• Instrumentation Implementation

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Using Data Loggers - Overview

• Connect data logger to PC
• select sampling intervals and start time
• initiate the logger
• Disconnect logger and deploy
• logger makes measurements
• Reconnect logger to PC
• readout the data
• view data as a graph or table
• export data to spreadsheet or other software

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General Specifications

• Capacity 7943 measurements total
• User-selectable sampling interval
• 0.5 seconds to 9 hours
• External input models
• external temperature probes
• AC current (4-20 mA)
• Voltage DC (0 2.5V)
• CO2 meters give voltage output
• Programmable start time/date

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Temperature Measurement
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Relative Humidity

• Range 25 to 95 RH at 80F
• Accuracy 5
• Response time
• 10 min. typical in air

The HOBOs RH sensor will be damaged by
condensation. It must not be exposed to fog,
mist or other condensing conditions!
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Light Intensity

• Range 2 to 600 foot-candles (lumens/ft2)
• Accuracy 2 foot-candles, 20 of reading
• Angular response roughly cosine of the angle
  from directly above sensor
• Light wavelength response

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External Input

• Wide range of temperature sensors
• External temperature probe has lower time
  constant than temperature sensor in HOBO Unit
• 0-2.5 V DC input cable (CO2 Monitor)
• Input range 0 to 2.5 Volts DC
• Accuracy 10 mV 1 of reading
• Resolution 10 mV (8-bit)
• 10 mv ? 16 ppm

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Using the Launching and Readout Software
Info about logger current date and time previous
deployments
Description of loggers deployment is entered
here
Interval pulldown menu selects sampling rate
Memory selection
Delayed start option
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Enabling Measurement Channels
3. Click Apply to set channels
1. Relates to data memory size divided by number
of channels enabled
4. After returning to launch window, click the
Start button to launch logger with your settings
2. Must specify type of data for each external
jack for data to display correctly
5. Logger can then be disconnected from computer
and deployed
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Readout
Select Series to Show in View Dialogue Box
Data Plots are constructed of data Series chosen
to be viewed
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Graphing and Analysis in Boxcar

• Powerful and robust data analysis and graphing
  program
• Analysis functions can be used to extract key
  information from logged data.
• Min, max and average values per interval

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Exporting Data to Other Programs

• Microsoft Excel export (.XLS or .TXT format)
• Lotus 1-2-3 and custom export (.TXT format)
• International data format options

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Telaire 7001 Carbon Dioxide and Temp Monitor

• Capabilities
• Display CO2 readings and
• calculate outside air ventilation
• rates in cfm/person
• Monitoring allows us to
• Identify energy saving
• opportunities in over-ventilated
• spaces

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Specifications

• CO2 Measurement Range
• 0-4,000 ppm voltage output 0-10,000 ppm display
• CO2 Measurement Accuracy
• Max(50 ppm, 5 of reading)
• Temperature Range
• 32 to 104F
• Accuracy
• 2F

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Extech Heavy Duty Hot Wire Thermo-Anemometer
Flow Rate Measurements
http//www.qualityinstrumentsinc.com/products/exte
ch/407123.pdf
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Obtaining Additional Information

• HOBO Specs and Information
• http//www.onsetcomp.com/Whats_New/Press_Release_d
  ata_sheets/2560_H08PR.html
• Information on Boxcar Pro 4.3
• http//www.onsetcomp.com/Products/Product_Pages/Bo
  xCar_Pro_pages/4262_BCP40.html
• Boxcar Interactive Demo
• http//www.onsetcomp.com/Products/Product_Pages/Bo
  xCar_Pro_pages/5371_BCP4_Tour.html
• Telaire CO2 Meter
• http//www.telaire.com/telaire.htm
• Extech Flow Rate Meter
• http//www.qualityinstrumentsinc.com/products/exte
  ch/407123.pdf

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Implementation of Instrumentation
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Third Floor Layout

• Offices South Side

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Third Floor Layout

• Offices North Side

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Third Floor Layout

• Offices Core

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Third Floor Layout

• Seminar Room, Conference Room, Class Room

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Third Floor Layout

• Lounge

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Plan for HOBO units

• Narrow down number of floors
• 3rd floor
• one of top floors
• 5 rooms per floor
• one room (lounge) always monitored as control
• cycle through other offices/class rooms

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Plan for HOBO units

• Length of trials
• 6 days (Monday Saturday)
• start with 2-day trial
• Time between samples
• 15 minutes