Met One Instruments GT-324 User manual

GT-324 Manual Page 1 GT-324-9800 Rev B
Met One Instruments, Inc
Corporate Sales & Service: 1600 NW Washington Blvd. Grants Pass, OR 97526
Tel [phone] Fax [phone]
www.metone.com [e-mail]
GT-324
MANUAL

GT-324 Manual Page 3 GT-324-9800 Rev B
Copyright Notice
GT-324 Manual
© Copyright 2018 Met One Instruments, Inc. All Rights Reserved Worldwide. No part of
this publication may be reproduced, transmitted, transcribed, stored in a retrieval
system, or translated into any other language in any form by any means without the
express written permission of Met One Instruments, Inc.
Technical Support
Should you require support, please consult your printed documentation to resolve your
problem. If you are still experiencing difficulty, you may contact a Technical Service
representative during normal business hours—7:00 a.m. to 4:00 p.m. Pacific Standard
Time, Monday through Friday.
Voice: [phone]
Fax: [phone]
E-Mail: [e-mail]
Mail: Technical Services Department
Met One Instruments, Inc.
1600 NW Washington Boulevard
Grants Pass, OR 97526
NOTICE
CAUTION—Use of controls or adjustments or performance of
procedures other than those specified herein may result in
hazardous radiation exposure.
WARNING—This product, when properly installed and operated, is
considered a Class I laser product. Class I products are not
considered to be hazardous.
There are no user serviceable parts located inside the cover of this device.
Do not attempt to remove the cover of this product. Failure to comply with this
instruction could cause accidental exposure to laser radiation.

GT-324 Manual Page 4 GT-324-9800 Rev B
Table of Contents
1. Introduction........................................................................................................... 5
2. Setup...................................................................................................................... 5
2.1. Unpacking..................................................................................................................................5
2.2. Layout........................................................................................................................................8
2.3. Default Settings .........................................................................................................................9
2.4. Initial Operation..........................................................................................................................9
3. User Interface ........................................................................................................ 9
4. Operation............................................................................................................... 9
4.1. Power Up...................................................................................................................................9
4.2. Sample Screen........................................................................................................................10
4.3. Sampling..................................................................................................................................11
5. Settings Menu...................................................................................................... 12
5.1. View Settings...........................................................................................................................12
5.2. Edit Settings.............................................................................................................................13
6. Serial Communications ...................................................................................... 15
6.1. Connection...............................................................................................................................15
6.2. Commands ..............................................................................................................................16
6.3. Real Time Output.....................................................................................................................17
6.4. Comma Separated Value (CSV) .............................................................................................17
7. Maintenance ........................................................................................................ 17
7.1. Charging the Battery................................................................................................................17
7.2. Service Schedule.....................................................................................................................18
7.3. Flash Upgrade.........................................................................................................................19
8. Troubleshooting.................................................................................................. 19
9. Specifications...................................................................................................... 20
Warranty / Service Information .................................................................................. 21

GT-324 Manual Page 5 GT-324-9800 Rev B
1. Introduction
The GT-324 is a small lightweight four channel hand held particle counter. Key features
include:
Simple user interface with multifunction rotary dial (rotate and press)
8 hours continuous operation
4 count channels. All channels are user selectable to 1 of 7 preset sizes:
(0.3m, 0.5m, 0.7m, 1.0m, 2.5m, 5.0m and 10m)
Concentration and total count modes
Fully integrated temperature/relative humidity sensor
Password protection for user settings
2. Setup
The following sections cover unpacking, layout and performing a test run to verify
operation.
2.1. Unpacking
When unpacking the GT-324 and accessories, inspect the carton for obvious damage.
If the carton is damaged notify the carrier. Unpack everything and make a visual
inspection of the contents. Standard items (included) are shown in
Figure 1 –Standard Accessories. Optional accessories are shown in
Figure 2 –Optional Accessories.
ATTENTION:
The included USB drivers must be installed before connecting the GT-324 USB port to
your computer. If the supplied drivers are not installed first, Windows may install
generic drivers that are not compatible with this product. See section 6.1.
To install USB drivers:
Insert the Comet CD. The install program should run automatically and display the
screen below. If an AutoPlay pop-up window appears, select “Run AutoRun.exe”.
Finally, select “USB Drivers” to start the install process.

GT-324 Manual Page 6 GT-324-9800 Rev B
Figure 1 –Standard Accessories
GT-324 Standard Accessories
GT-324
MOI P/N: GT-324
Battery Charger
MOI P/N: 390031
USB Cable
MOI P/N: 500787
GT-324 Manual
MOI P/N GT-324-
9800
Calibration
Certificate
MOI P/N:
GT-324-9600
Comet Software
CD
MOI P/N: 80248
Carrying Case
MOI P/N: 8517
Particle View
Software CD
MOI P/N Particle
View
Power Cord
MOI P/N: 400113
IsoKinetic Probe
MOI P/N 83117
Zero Filter
MOI P/N G3111

GT-324 Manual Page 7 GT-324-9800 Rev B
Figure 2 –Optional Accessories
GT-324 Optional Accessories
Flow Meter
MOI P/N: 9801

GT-324 Manual Page 8 GT-324-9800 Rev B
2.2. Layout
The following figure shows the layout of the GT-324 and provides a description of the
components.
Figure 3 –GT-324 Layout
Component
Description
Display
2X16 character LCD display
Keyboard
2 key membrane keypad
Rotary dial
Multifunction dial (rotate and press)
Charger Jack
Input jack for external battery charger. This jack charges the internal
batteries and provides continuous operating power for the unit.
Flow Adjust
Adjusts the sample flow rate
Inlet Nozzle
Sample nozzle
USB Port
USB communication port
Temp/RH
Sensor
Integrated sensor that measures ambient temperature and relative
humidity.
USB Port
Display
Charger Jack
Inlet Nozzle with
Isokinetic Probe
Keyboard
Rotary Dial
Flow Adjust
Temp/RH Sensor

GT-324 Manual Page 9 GT-324-9800 Rev B
2.3. Default Settings
The GT-324 comes with the user settings configured as follows.
Parameter
Value
Sizes
0.3, 0.5, 5.0, 10 m
Temperature
C
Sample Location
1
Sample Mode
Manual
Sample Time
60 seconds
Count Units
CF
2.4. Initial Operation
The battery should be charged for 2.5 hours prior to use. Refer to Section 7.1 of this
manual for battery charging information.
Complete the following steps to verify proper operation.
1. Press the Power key for 0.5 seconds or more to turn on power.
2. Observe the Startup screen for 3 seconds then the Sample screen (Section 4.2)
3. Press Start / Stop key. The GT-324 will sample for 1 minute and stop.
4. Observe the counts on the display
5. Rotate the Select dial to view other sizes
6. The unit is ready for use
3. User Interface
The GT-324 user interface is composed of a rotary dial, 2 button keypad and an LCD
display. The keypad and rotary dial are described in the following table.
4. Operation
The following sections cover the basic operation of GT-324.
4.1. Power Up
Press the Power key to power up the GT-324. The first screen shown is the Startup
Screen (Figure 4). The Startup Screen displays the product type and company website
for approximately 3 seconds before loading the Sample Screen.
GT-324
WWW.METONE.COM
Figure 4 –Startup Screen
Control
Description
Power Key
Power the unit on or off. For power on, press for 0.5 seconds or more.
Start / Stop Key
Sample Screen
START / STOP a sample event
Settings Menu
Return to Sample screen
Edit Settings
Cancel edit mode and return to the Settings Menu
Select Dial
Rotate the dial to scroll through selections or change values. Press the dial
to select item or value.

GT-324 Manual Page 10 GT-324-9800 Rev B
4.1.1. Auto Power Off
The GT-324 will power down after 5 minutes to preserve battery power providing the
unit is stopped (not counting) and there is no keyboard activity or serial
communications.
4.2. Sample Screen
The Sample Screen displays sizes, counts, count units, and time remaining. The time
remaining is displayed during sample events. The Sample Screen is shown in Figure 5
below.
0.3u 2,889 CF
0.5u 997 60
Figure 5 –Sample Screen
Channel 1 (0.3) is displayed on Sample Screen Line 1. Rotate the Select dial to
display channels 2-4, battery status, ambient temperature, and relative humidity on line
2 (Figure 6).
0.3u 2,889 CF
BATTERY = 100%
Figure 6 –Battery Status
4.2.1. Warnings / Errors
The GT-324 has internal diagnostics to monitor critical functions such as low battery,
system noise and an optical engine failure. Warnings / errors are displayed on Sample
Screen Line 2. When this occurs, simply rotate the Select dial to view any size on the
top line.
A low battery warning occurs when there is approximately 15 minutes of sampling
remaining before the unit stops sampling. A low battery condition is shown in Figure 7
below.
0.5u 6,735 CF
Low Battery!
Figure 7 –Low Battery
Excessive system noise can result in false counts and reduced accuracy. The GT-324
automatically monitors system noise and displays a warning when the noise level is
high. The primary cause of this condition is contamination in the optical engine. Figure
7 shows the Sample screen with a System Noise warning.
0.5u 6,735 CF
System Noise!
Figure 8 –System Noise
Count Units (Section 4.3.3)
Time Remaining

GT-324 Manual Page 11 GT-324-9800 Rev B
A sensor error is reported when the GT-324 detects a failure in the optical sensor.
Figure 9 shows a sensor error.
0.5u 6,735 CF
Sensor Error!
Figure 9 –Sensor Error
4.3. Sampling
The following sub-sections cover sample related functions.
4.3.1. Starting/Stopping
Press the START/STOP key to start or stop a sample from the Sample Screen.
Depending on the sample mode, the unit will either run a single sample or continuous
samples. Sample modes are discussed in Section 4.3.2.
4.3.2. Sample Mode
The sample mode controls single or continuous sampling. The Manual setting
configures the unit for a single sample. The Continuous setting configures the unit for
nonstop sampling.
4.3.3. Count Units
The GT-324 supports total counts (TC), particles per cubic foot (CF), particles per cubic
meter (M3) and particles per liter (/L). Concentration values (CF, /L, M3) are time
dependent. These values may fluctuate early in the sample; however, after several
seconds the measurement will stabilize. Longer samples (e.g. 60 seconds) will improve
concentration measurement accuracy.
4.3.4. Sample Time
Sample time determines the sample duration. Sample time is user settable from 3 to 60
seconds and is discussed in Sample Timing below.
4.3.5. Sample Timing
The following figures depict the sample timing sequence for both manual and
continuous sampling. Figure 10 shows the timing for manual sample mode. Figure 11
shows the timing for continuous sample mode. The Start section includes a 3 second
purge time.
Start Stop
Sample Time
Figure 10 –Manual Sample Mode
Start Stop
Sample Time
Sample Time
//
Figure 11 –Continuous Sample Mode