VELOCICALC AIRFLOW 9555 Quick Reference

A

Ventilation Test Instruments

9555 Menu Structure and Quick Reference

Application Note TSI-145

Pressure Ports

Battery Indicator

Additional Messages

Primary Parameter

ctivity Area

Secondary Parameters

Soft Key Indicators

Soft Keys

Keypad Functions

ON/OFF Key

Arrow (ST) Keys

 (Enter) Key

Arrow (gor h) and
Menu Soft Keys

Press to turn the A
display will show the following: Model Number, Serial Number, Software
Revision and Last Date Calibrated.

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

Press to accept a value or condition.

Press arrow keys to change choices while setting a parameter. Press the Menu
soft key to select the Menu selections, which are Display Setup, Pressure Zero,
Settings, Flow Setup, Actual/Std Set up, Data Logging, Applications, Calibra­tion and Printer.

IRFLOW 9555 on and off. During the power up sequence the

ST

ST keys simultaneously.

Next Test

Menu

Stats

Main Soft Keys

• Increments to the next available test ID.

• Accesses the main and sub-menus

• Displays the average, minimum, and

maximum readings of the current Test ID.

o Statistics can also be viewed from

the Data Logging menu.

Common Terms

Sample

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

Test ID

Time Constant

Logging Interval

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.

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”.

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.

Log Mode/Log Settings

You can set Log Mode to Manual, Auto-save, Cont-key, Cont-time, Program 1 or Program 2.

• 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 in-

strument will continue taking measurements until the  key is pressed again.

• In Cont-time mode, the user starts taking readings by pressing the  key. The instrument will

continue taking samples until a set period of time has passed.

• Auto-save, Cont-Key and Cont-time modes have the following additional Log Settings:

Log Settings

Mode

Auto-save Log Interval
Cont-key Log Interval
Cont-time Log Interval

Test Length

• Pressing the

ments to the instruments. To unlock the keypad, press the

ST keys simultaneously will lock the keypad to prevent unauthorized adjust-

ST keys simultaneously.

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