Rae PGM-7240 User manual

ppbRAE Plus
Parts per Billion VOC Monitor
PGM-7240
OPERATION AND MAINTENANCE
MANUAL
(Document No.: 025-4001)
June 2004, Rev C2 Addendum 1.0
RAE SYSTEMS INC.
1339 Moffett Park Drive
Sunnyvale, CA 94089

ii
4.5 Changing Alarm Limits 46
4.5.1 Changing Low Alarm Limit 48
4.5.2 Changing the STEL Limit 49
4.5.3 Changing the TWA Limit 50
4.6 Viewing or Changing the Datalog 51
4.6.1 Viewing Data (Datalog) 52
4.6.2 Clearing Data 54
4.6.3 Changing the Data Period 55
4.6.4 Changing the Average Type 56
4.7 Changing Monitor Setup 57
4.7.1 Changing Operation Mode 58
4.7.2 Changing Site ID 59
4.7.3 Changing User ID 60
4.7.4 Changing Alarm Mode 61
4.7.5 Changing the User Mode 62
4.7.6 Changing the Date 63
4.7.7 Changing the Time 64
4.7.8 Changing the Lamp 65
4.7.9 Changing the Units 66
4.7.10 Changing the Output 67
4.7.11 Changing the Pump Speed 68
4.7.12 Changing the DAC Range 69
4.8 Exit Programming Mode 70
Chapter 5 Computer Interface 71
5.1 Install ProRAE-Suite Software 72
5.2 Connecting ppbRAE to the PC 74
5.3 Starting ProRAE-Suite Software 75
5.4 Setup Communication Port 77
5.5 Processing the Configuration Data 78

OPERATION
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After the monitor is turned on, it runs through the start up
menu. Then the message “Ready..” is displayed (see figure
below). At this point, the user has two options: (1) step
through the operation menu (see below), or (2) take a
Press the [MODE] key to cycle through the main operation
menu. The PID sensor and pump are turned off during this
operation.
Main operation menu displays include:
“Ready…”
Avg reading
Peak reading
Run time
Current battery voltage and shut down voltage
Date, time, and temperature
Log on/off?
PC comm?
Ready…
measurement (see page 16).
Gas = [reference gas] (default is isobutylene)
Cancel background?
Figure 2-3. Survey mode "Ready..."
2.4.1 Survey Mode
Mode [Survey or Hygiene]

OPERATION
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The displays are arranged in a “round robin” order:
To choose a specific display, press the [MODE] key one or
more times until the desired display appears.
Ready
Mode
PC comm?
08/08/99
10:30
To get back to “Ready” mode from any of the above
displays, press the [MODE] key repeatedly until the
“Ready” message reappears.
T=xx°
Gas=
Cancel background?
Log on/off?
Peak
Avg
xxx ppm/ppb
xxx ppm/ppb
hh:mm
Run Time
Bat = x.x V
Figure 2-4. Survey Mode Flow Chart
Note:

OPERATION
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“Ready..” To choose a specific display, press the
[MODE] key one or more times until the desired
display appears.
There are two ways to start a measurement: (1)operating in
the Hygiene mode and (2) manually starting and stopping
measurement in the Survey mode. To start a measurement
in the Hygiene mode, please refer to Section 4.7.1 on
“Change Op mode.” To start a measurement in Survey
mode, the ppbRAE monitor must first be in the “Ready…”
mode. This is the mode that the monitor normally powers
up.
Measurement phases:
• Ready
• Start measurement
• Measurement display and datalogging
• Stop measurement
Ready:
The ppbRAE monitor is ready to start a sample.
Start Measurement:
Press the [Y/+] key to start the measurement cycle. Display
will say"Check", and check the lamp. If the lamp does not
show the site ID and then the gas selected for
measurement. The pump will start and the reading will be
displayed.
Measurement Display and Datalog :
Instantaneous readings of the gas concentration in parts per
billion (ppb) are updated every second. A flashing
superscript “L” is displayed when datalogging is on.
Datalog information is saved only after one full datalog
period iscompleted.
Taking a measurement:
turn on, "Can not turn on lamp, quit!, will display. Press any
key and try again. If lamp turns on, the display will

OPERATION OF ACCESSORIES
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To install the adapter, remove the cover of the battery
compartment. Remove the Ni-Cd or Ni-MH battery pack
from the battery compartment and replace with the alkaline
battery adapter. Replace the battery compartment cover.
The internal charging circuit is designed to prevent damage
to alkaline batteries and the charging circuit when alkaline
batteries are installed inside the monitor.
Note: The AA Alkaline battery adapter supplied by RAE
Systems Inc. is intrinsically safe!
3. External Filter
The external filter is made of PTFE (Teflon(tm)) membrane
with a 10-micron pore size to help mininize water from being
sucked into the sensor manifold, which would cause
extensive damage to the monitor. Itwill also prevent most
dust and other particles from entering the monitor and
prolong the operating life of the sensor.
To install the external filter, simply insert it to the front of the
inlet tube of the ppbRAE monitor.

OPERATION OF ACCESSORIES
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4. VOC Zeroing Tubes
VOC Zeroing Tubes (P/N 025-2000-010) are used for
filtering organic air contaminants that may affect the
zero calibration reading.
1) Connect the tube adapter to the Flex-I-Probe by inserting
the tip of the sample probe into the smaller end;
2) Break the two ends of a VOC zeroing tube using the side
hole of the tube adapter;
3) Insert one end (the arrow in the silk screen indicates the
right direction) of the open VOC zeroing tube into the bigger
end of the adapter;
4) Run the zeroing calibration procedure of the instrument to
zero the unit;
5) Discard the used VOC zeroing tube (single use only) and
put the tube adapter back to the VOC zeroing kit container.
Tube tip breaker Tube adapter
VOC Zeroing Tube Flex-i-Probe

PROGRAMMING
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4.1 Programming Mode
The programming mode allows users to change the setups in
the monitor, calibrate the monitor, modify the sensor
configuration and enter user information, etc. The
programming mode has four menu items. Each menu item
includes several sub-menus to perform additional
programming functions. Appendix A shows a more detailed
menu tree structure.
Table 4-1. Programming Menu
Calibrate/Select Gas?
Change Alarm Limits?
View or Change Datalog?
Change Monitor Setup?
Once inside the programming mode, the LCD will display
the first menu. Each subsequent menu item can be viewed
by pressing the [N/ ] repeatedly until the desired menu is
displayed. To enter the sub-menu of a particular menu,
press [Y/+] key, the sub-menu will be displayed.
Return to Operation mode: To exit the programming mode
and return to operation, press the [MODE] key once at any
of the programming menu displays.

PROGRAMMING
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This procedure determines the zero point of the sensor
calibration curve. To perform a zero air calibration, connect
the tube adapter, break off both ends of a VOC zeroing tube
and insert the tube into the adapter.
1. Press the [Y/+] key at the "Zero Cal?" prompt
to start the zero calibration
2. The display will read "zeroing in progress". It will
count down from 30 to 1 and then say, "please wait".
3. When the zero span is finished, the display will move
on to the span calibration.

PROGRAMMING
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4.4.2 Span Calibration
This procedure determines the second point of the sensor
calibration curve for the sensor. A cylinder of standard
reference gas (span gas) fitted with a 500 cc/min. flow-
limiting regulator or a flow-matching regulator is needed to
perform this procedure. Choose the 500 cc/min. regulator
only because the flow rate matches the flow rate of the
pump inside. Alternatively, the span gas can first be filled
into a Tedlar Bag. Connect the calibration adapter to the
inlet port of the ppbRAE Monitor, and connect the tube to
the regulator or Tedlar bag.
1. Before executing a span calibration, make sure the span
value has been set correctly (see next sub-menu).
2. Make sure the monitor is connected to one of the span
gas sources described above.
3. Press the [Y/+] key at the “Span Cal?” to start the
calibration. The display shows the gas name and the
span value of the corresponding gas.
4. The display shows: “Apply gas now!” Turn on the
valve of the span gas supply.
5. Display shows “wait.... 30” with a count down timer
showing the number of remaining seconds while the
monitor performs the calibration.
6. To abort the calibration, press any key during the count
down. The display shows “Aborted!” and return to
“Span Cal?” sub-menu.
7. When the count-down timer reaches 0, continue to
apply gas. The display will read "Please wait" - continue
apply gas. The display will show the calibrated value.