TSI 7525 IAQ-Calc Indoor Air Quality Meter Owner’s Manual

TSI 7525 IAQ-Calc Indoor Air Quality Meter

Setting-up

Supplying Power to the Model 7525 IAQ-Calc™ Indoor Air Quality Meter
The Model 7525 can be powered in one of two ways: four size AA batteries or the optional AC adapter.

Installing the Batteries
Insert four AA batteries as indicated by the diagram located on the inside of the battery compartment. The Model 7525 is designed to operate with either alkaline or NiMH rechargeable batteries, although it will not recharge NiMH batteries. Battery life will be shorter if NiMH batteries are used. Carbon- zinc batteries are not recommended because of the danger of battery acid leakage.

Using the Optional AC Adapter
When using the AC adapter, the batteries (if installed) will be bypassed. Be sure to provide the correct voltage and frequency, which is marked on the back of the AC adapter. The AC adapter is not a battery charger.

Using the Probe
The sensing probe relies on the diffusion of air. For best results, try to keep the sensing probe surrounded by moving air. Do not breathe on the probe. Humans exhale CO2 levels exceeding 10,000 ppm and it may take time for the probe to re-stabilize. Use the probe holder to support the probe when in continuous data logging mode.

Connecting to a Computer
Use the USB Cable provided with the Model 7525 to connect the instrument to a computer. For more information on how to
download stored data see Chapter 3 section titled LogDat2™ Downloading Software.

C A U T I O N
This symbol is used to indicate that the data port of the Model 7525 IS NOT intended for connection to a public telecommunications network. Connect the USB data port only to another USB port.

Operation

Keypad Functions

ON/OFF Key| Press to turn the Model 7525 on and off. During the power-up sequence, the display will show the following: Model Number, Serial Number and Software Revision.
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Arrow ( ) Keys| Press to scroll through choices while setting a parameter. Pressing the keys simultaneously will lock the keypad to prevent unauthorized adjustments to the instruments. To unlock the keypad, press the keys simultaneously.
(Enter) Key| Press to accept a value or condition.
Arrow ( ) and Menu Soft Keys| Press arrow keys to change choices while setting a parameter. Press the Menu soft key to select the Menu selections, which are Display Setup, Settings, Barometric Pressure, Data Logging, Applications, and Calibration.

Common Terms
In this manual there are several terms that are used in different places. The following is a brief explanation of the meanings of those terms.

Sample| Consists of all of the measurement parameters stored at the same time.
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Test ID| A group of samples. The statistics (average, minimum, maximum, and count) are calculated for each test ID. The maximum number of test IDs is 100.
Time Constant| The time constant is an averaging period. It is used to dampen the display. If you are experiencing fluctuating flows, a longer time constant will slow down those fluctuations. The display will update every second, but the displayed reading will be the average over the last time constant period. For example, if the time constant is 10 seconds, the display will update every second, but the displayed reading will be the average from the last 10 seconds. This is also referred to as a “moving average”.
Logging Interval| The logging interval is a frequency period that the instrument will log readings. For example, if the logging interval is set to 30 minutes, each sample will be the average of the last 30 minutes.
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Menus

DISPLAY SETUP
The display setup menu is where you will setup the desired parameters to be displayed on the running screen. With a parameter highlighted you can then use the ON soft key to have it show up on the running screen or select the OFF soft key to turn off the parameter. Use the PRIMARY soft key to have a parameter show up on the running screen in a larger display. Only one parameter can be selected as a primary, and up to 2 secondary parameters can be selected atone time.

SETTINGS
Settings menu is where you can set the general settings. These include Language, Beeper, Select Units, Time Constant, Contrast, Set Time, Set Date, Time Format, Date Format, Number Format, Backlight and Auto Off. Use the soft keys to scroll through the settings for each option and use the key to accept settings.

BAROMETRIC PRESSURE
The barometric Pressure menu is where you set the barometric pressure, which can affect the CO2 measurement.

DATA LOGGING

Measurements
Measurements to be logged are independent of measurements on the display, and must therefore be selected under DATA LOGGING → Measurements.

Log Mode/Log Settings
You can set Log Mode to Manual, Auto-save, or Cont-key.

• Manual mode does not automatically save data, but instead prompts the user to save a sample.
• In Auto-save mode, the user manually takes samples that are automatically logged.
• In Cont-key mode, the user starts taking readings and logging by pressing the key. The instrument will continue taking measurements until the key is pressed again.
• Auto-save and Cont-Key modes have the following additional Log Settings:
  Mode| Log Settings
  ---|---
  Auto-save| Log Interval
  Cont-key| Log Interval
• Pressing the keys simultaneously will lock the keypad to prevent unauthorized adjustments to the instruments. To unlock the keypad, press the keys simultaneously.
  Delete Data
  Use this to delete all data, delete test or delete sample.
  % Memory
  This option displays the memory available. Delete All, under Delete Data, will clear memory and reset the memory available.

APPLICATIONS

You can choose % Outside Air in the Applications menu. After choosing this application, take measurements or enter data for each line.

LogDat2™ Downloading Software
The Model 7525 comes with special software called LogDat2™ Downloading Software, which is designed to provide you with maximum flexibility and power. To install this software on your computer, follow the instructions on the label of the LogDat2™ CD-ROM.

You can also download LogDat2™ software from the tsi.com website in the Service/Support page under Software. Once downloaded onto your PC, click the application file to begin installation. Follow the on-screen instructions to install the software. To download data from the Model 7525, connect the supplied computer interface USB cable to the Model 7525 and to a computer USB port. Then run the LogDat2™ downloading software. Within the LogDat2™ software, either select the tests to be downloaded or double-click on a test to open it.

Maintenance

The Model 7525 requires very little maintenance to keep it performing well.

Recalibration
To maintain a high degree of accuracy in your measurements, TSI® recommends that you return your Model 7525 to TSI® for annual recalibration. Please contact one of TSI’s offices or your local distributor to make service arrangements and to receive a Service Request number. To fill out an online “Service Request” form, visit TSI® Incorporated’s website at tsi.com/service.

U.S. & International
TSI Incorporated
500 Cardigan Road
Shoreview MN 55126-3996
Tel: 800-680-1220
651-490-2860 Fax: 651-490-3824
The Model 7525 can also be recalibrated in the field using the CALIBRATION menu. These field adjustments are intended to make minor changes in calibration to match a user’s calibration standards. The field adjustment IS NOT intended as a complete calibration capability. For complete, multiple- point calibration and certification, the instrument must be returned to the factory.

Cases
If the instrument case or storage case needs cleaning, wipe it off with a soft cloth and isopropyl alcohol or a mild detergent. Never immerse the Model 7525. If the enclosure of the Model 7525 or the AC adapter becomes broken, it must be replaced immediately to prevent access to hazardous voltage.

Storage
Remove the batteries when storing the unit for more than one month to prevent damage due to battery leakage.

Troubleshooting

Table 5-1 lists the symptoms, possible causes, and recommended solutions for common problems encountered with the Model 7525. If your symptom is not listed, or if none of the solutions solves your problem, please contact TSI®.
Table 5-1: Troubleshooting the Model 7525

Shade the probe while taking samples.
High CO2 levels| Breathing on probe| Shield probe from breath and allow instrument to re- stabilize.
No response to keypad| Keypad locked out| Unlock keypad by pressing keys simultaneously.
Instrument Error message appears| Memory is full| Download data if desired then

DELETE ALL memory.

Fault in instrument| Factory service required on instrument.

W A R N I N G !
Remove the probe from excessive temperature immediately: excessive heat can damage the sensor. Operating temperature limits can be found in Appendix A, Specifications.

Specifications

Specifications are subject to change without notice.
CO2:

• Range: 0 to 5000 ppm

• Accuracy1: ±3% of reading or ± 50 ppm, whichever is greater

• Resolution: 1 ppm

• Sensor type: Non-Dispersive Infrared (NDIR)
  Temperature:

• Range: 32 to 140F (0 to 60C)

• Accuracy2: ±1.0F (±0.6C)

• Resolution: 0.1F (0.1C)

• Response time: 30 seconds (90% of final value, air velocity at 2 m/s)

• Display units: F or C (user selectable)

• Type: Thermistor
  Humidity:

• Range: 5 to 95% RH

• Accuracy3: ±3% RH (includes ±1% hysteresis)

• Resolution: 0.1% RH

• Response time: 20 seconds (for 63% of final value)

• Sensor type: Thin-film capacitive
  Instrum ent Temperature Range:

• Operating (Electronics): 40 to 113°F (5 to 45°C)

• Storage: -4 to 140°F (-20 to 60°C)
  Instrument Operating Conditions:

• Altitude up to 4000 meters

• Relative humidity up to 80% RH, non-condensing

• Pollution degree 1 in accordance with IEC 664

• Transient over voltage category II
  Data Storage Capabilities:

• Range: 30,300 data points with key (3) measured parameters enabled
  Logging Interval:

• Intervals: 1 second up to 1 hour (user selectable)
  Time Constant:

• Intervals: User selectable
  External Meter Dimensions:

• 3.3 in. 7.0 in. 1.8 in. (8.4 cm 17.8 cm 4.4 cm)
  Meter Probe Dimensions:

• Probe Length: 7.0 in. (17.8 cm)
  Probe Diameter of Tip: 0.75 in. (1.9 mm)
  Meter Weight:

• Weight With Batteries: 0.6 lbs (0.27 kg)
  Power Requirements:

• Four AA-size batteries (included) or AC adapter (optional) 9 VDC, 300 mA, 4-18 watts (input voltage and frequency vary depending on which adapter is used)

1. Add ±0.2%/○F (±0.2%/○C) away from calibration temperature.
2. At 77°F (25°C). Add the uncertainty of ±0.2%/°F (±0.2%/°C) away from calibrated temperature
3. At 77°F (25°C). Add the uncertainty of ±0.03% RH/°F (±0.03% RH/°C) away from calibrated temperature.

TSI Incorporated – Visit our website www.tsi.com for more information.
UK Tel: +44 149 4 459200

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