IAQ-CALC Indoor Air Quality Meter Model #7545 Operation And Service Manual
- June 8, 2024
- IAQ-CALC
Table of Contents
IAQ-CALC Indoor Air Quality Meter Model #7545 Operation And Service Manual
Chapter 1 Unpacking and Parts Identification
Carefully unpack the instrument and accessories from the shipping container. Check the individual parts against the list of components below. If anything is missing or damaged, notify TSI immediately.
- Carrying case
- Instrument
- USB cable
- CD-ROM with downloading software
- Calibration collar
- AC adapter
Chapter 2 Setting-up
Supplying Power to the Model 7545 IAQ-Calc Indoor Air Quality Meter
The Model 7545 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 7545 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 7545 to connect the instrument to a computer for downloading stored data. For more information on how to download stored data see Chapter 3 section titled LogDat2™ Downloading Software.
Caution: This symbol is used to indicate that the data port of the Model 7545 is not intended for connection to a public telecommunications network. Connect the USB data port only to another USB port.
Chapter 3 Operation
Keypad Functions
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.
Menus
DISPLAY SETUP
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 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 at one 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 ‹ or › soft keys to scroll through the settings for each option and use the ↵ key to accept settings.
BAROMETRIC PRESSURE
Barometric Pressure menu is where you set the barometric pressure, which can affect the CO2 measurement.
ZERO CO
Zero CO menu item sets the baseline (zero) reading for the CO sensor. Only zero the CO sensor in fresh air, where no CO is present, or with the probe connected to zero gas.
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.
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Manual mode does not automatically save data, but instead prompts the user to save a sample.
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In Auto-save mode, the user manually takes samples that are automatically logged.
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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.
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Auto-save and Cont-Key modes have the following additional Log Settings:
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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 7545 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.
To download data from the Model 7545, connect the supplied computer interface USB cable to the Model 7545 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.
Chapter 4 Maintenance
The Model 7545 requires very little maintenance to keep it performing well.
Recalibration
To maintain a high degree of accuracy in your measurements, we recommend that you return your Model 7545 to TSI for annual recalibration. Please contact one of TSI’s offices or your local distributor to make service arrangements and to receive a Return Material Authorization (RMA) number. To fill out an online RMA form, visit TSI’s website at http://service.tsi.com.
U.S. & International
TSI Incorporated
500 Cardigan Road
Shoreview MN 55126-3996
Tel: 800-874-2811
651-490-2811
Fax: 651-490-3824
The Model 7545 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 7545. If the enclosure of the Model 7545 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.
Chapter 5 Troubleshooting
Table 5-1 lists the symptoms, possible causes, and recommended solutions for common problems encountered with the Model 7545. If your symptom is not listed, or if none of the solutions solves your problem, please contact TSI.
Table 5-1: Troubleshooting the Model 7545
Appendix A
Specifications
Specifications are subject to change without notice.
CO 2:
Range: 0 to 5000 ppm
Accuracy1 : ±3% of reading or ±50 ppm, whichever is greater
Resolution: 1 ppm
Sensor type: Non-Dispersive Infrared (NDIR)
CO Sensor:
Range: 0 to 500 ppm
Accuracy: ±3% of reading or ±3 ppm, whichever is greater [add ±0.28%/°F
(±0.5%/°C) away from calibration temperature] Resolution: 0.1 ppm
Response time: <60 seconds to 90% of final value.
Sensor type: Electro-chemical
Temperature:
Range: 32 to 140°F (0 to 60°C)
Accuracy2 : ±1.0°F (±0.6°C)
Resolution: 0.1°F (0.1°C)
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
Accuracy2 : ±3.0% RH (includes ±1% hysteresis)
Resolution: 0.1% RH
Response time: 20 seconds (for 63% of final value)
Sensor type: Thin-film capacitive
Instrument 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: 26,900 data points with key (4) measured parameters enabled
Logging Interval:
Intervals: 1 second up to 1 hour (user selectable)
Time Constant:
Intervals: 1 sec, 5 sec, 10 sec, 20 sec, 30 sec (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 cm)
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 uncertainty of ±0.2%/°F (±0.2%/°C) away from calibrated
temperature
3 At 77°F (25°C). Add uncertainty of ±0.03% RH/°F (±0.03% RH/°C) away from
calibrated temperature.
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