TSI/Alnor 7545 User manual

IAQ-CALC™

INDOOR AIR QUALITY METER

MODEL 7545

OPERATION AND SERVICE MANUAL

P/N 1980576, REVISION F

FEBRUARY 2016

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CONTENTS

CHAPTER 1 UNPACKING AND PARTS IDENTIFICATION ............ 1

CHAPTER 2 SETTING-UP ................................................................. 3

Supplying Power to the Model 7545 IAQ-CALC Indoor Air

Quality Meter .................................................................................. 3

Installing the Batteries ............................................................... 3

Using the Optional AC Adapter ................................................. 3

Using The Probe ............................................................................. 3

Connecting to a Computer .............................................................. 3

CHAPTER 3 OPERATION ................................................................. 5

Keypad Functions ........................................................................... 5

Common Terms .............................................................................. 5

Menus ............................................................................................. 6

DISPLAY SETUP ................................................................................. 6

SETTINGS ......................................................................................... 6

BAROMETRIC PRESSURE ................................................................... 6

ZERO CO .......................................................................................... 6

DATA LOGGING ................................................................................. 6

Measurements ........................................................................... 6

Log Mode/Log Settings ............................................................. 7

Delete Data ................................................................................ 7

% Memory ................................................................................. 7

APPLICATIONS .................................................................................. 7

CHAPTER 4 MAINTENANCE ............................................................ 9

Recalibration ................................................................................... 9

Cases .............................................................................................. 9

Storage ........................................................................................... 9

CHAPTER 5 TROUBLESHOOTING ................................................ 11

APPENDIX A SPECIFICATIONS ..................................................... 13

iii

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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.

1. Carrying case

2. Instrument

3. USB cable

4. CD-ROM with downloading software

5. Calibration collar

6. AC adapter

1

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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.

3

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ON/OFF Key

Press to turn the Model 7545 on and off. During the
power up sequence the display will show the
following: Model Number, Serial Number and
Software Revision.

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 ( or ) 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.

Sample

Consists of all of the measurement parameters
stored at the same time.

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”.

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.

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5

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.

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.

6 Chapter 3

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Log Mode/Log Settings

Mode

Log Settings

Auto-save

Log Interval

Cont-key

Log Interval

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:

 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.

Operation 7

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Symptom

Possible Causes

Corrective Action

No Display

Unit not turned on

Switch unit on.

Low or dead batteries

Replace batteries or
plug in AC adapter.

Dirty battery contacts

Clean the battery
contacts.

Humidity reading
near zero or not
believable

Probe exposed to
intense light

Shade the probe while
taking samples.

High CO2 levels

Breathing on probe

Shield probe from
breath and allow
instrument to re­stabilize.

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.

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

WARNING!

Remove the probe from excessive temperature immediately:
excessive heat can damage the sensor. Operating temperature limits
can be found in Appendix A, Specifications.

11

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Appendix A

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)

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

13

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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.

14 Appendix A

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