SKC 224-PCXR8 User manual

Operating Instructions
Universal Sample Pump
Cat. No. 224-PCXR8
SKC Inc.
863 Valley View Road
Eighty Four, PA 15330
Form 37713 Rev 1302

Table of Contents
Description..................................................................... 1
Performance Profile........................................................................................2
Operation........................................................................ 5
High Flow Applications ...................................................................................5
Low Flow Single-tube Applications...............................................................10
Low Flow Multiple-tube Applications ............................................................15
Maintenance................................................................. 20
Pump Inlet Filter ...........................................................................................20
Battery Pack Care ........................................................................................20
Installing the Battery Pack............................................................................21
Replacing Battery Pack ................................................................................21
Pump Service ...............................................................................................22
Warranty....................................................................... 22
Parts Descriptions....................................................... 24
Replacement Parts ...................................................... 26
Optional Accessories.................................................. 28
Indicates a warning or caution
Indicates a note or a premier feature of the pump

1
Description
The PCXR8 Universal Sample Pump is a constant flow air sampler suitable for a
broad range of applications. It is ideal for industrial hygiene studies as well as
environmental testing.
Low Flow Regulator
(beneath cap screw)
allows pump to be switched
from high to low flow.
Durable RFI-shielded Case
provides protection from radio
frequency interference
between 27 and 1000 MHz.
Rechargeable Battery
Built-in
Particulate Trap
in see-through
housing
protects pump.
Built-in Rotameter
provides a visible check
of relative flow rate during
sampling, from 0.5 to 5 L/min.
Accessory Mounting Screws
allow sampling accessories
such as impinger holders
to be secured to pump.
Recessed Flow Adjustment
adjusts flow rate between
1000 and 5000 ml/min.
Digital LCD
shows run time, set times,
battery check, and fault functions.
Touch Keypad
for programmable
functions.
On/Off Switch
Tamper-resistant Cover
prevents changes to settings.
PCXR8 Universal Sample Pump
Air Discharge Port
(beneath cap screw)

2
Performance Profile
Flow Range: 1000 to 5000 ml/min (UL Listed model)
(5 to 500 ml/min requires adjustable low flow holder)
Weight: 34 oz (964 gm)
Dimensions: 5.1 x 4.7 x 1.9 in (13 x 11.9 x 4.8 cm)
Compensation Range: 1000 to 2500 ml/min at 40 inches water back pressure
3000 ml/min at 35 inches water back pressure
4000 ml/min at 20 inches water back pressure
5000 ml/min at 10 inches water back pressure
Flow Control: Holds constant flow to ± 5% of the set point
Run Time: NiCad Battery: 8 hrs minimum at 4000 ml/min and 20 inches water back pressure;
dependent on media used. See Table 1 on page 4.
NiMH Battery: 12 hrs minimum at 4000 ml/min and 20 inches water back pressure;
dependent on media used. See Table 2 on page 4.
Battery Eliminator: Pump will provide extended runs.
Flow Indicator: Built-in rotameter with 250-ml division; scale marked at 1, 2, 3, 4, and 5 L/min
Power Supply: 6.0-V plug-in NiMH battery pack, rechargeable, 3.5-Ah capacity or
6.0-V plug-in NiCad battery pack, rechargeable, 2.0-Ah capacity
A battery eliminator is available (see Optional Accessories); use voids the UL List-
ing for intrinsic safety.
Charging Time: 6 to 8.5 hrs with PowerFlex charger
Intrinsic Safety: UL Listed for: Class I, Division 1 and 2, Groups A, B, C, D; Class II,
Division 1 and 2, Groups E, F, G; and Class III, Temperature Code T3C
ATEX-approved models available. Contact SKC.
Temperature: Operating: 32 to 113 F (0 to 45 C)
Storage: -4 to 113 F (-20 to 45 C)
Charging: 50 to 113 F (10 to 45 C)
Protect sample pump from weather when in use outdoors.
Operating Humidity: 0 to 95% non-condensing
Multiple-tube Sampling: Built-in constant pressure regulator allows user to take up to four simultaneous tube
samples at different flow rates up to 500 ml/min each using optional adjustable low
flow holder.
RFI/EMI Shielding: Complies with requirements of EN 55022, FCC Part 15 Class B, EN 50082-1;
frequency range of the radiated susceptibility test was 27 to 1000 MHz.
Compare the information in this table to pump compensation range to determine appropriate applications.
Typical Back Pressure of Sampling Media (inches water)
Flow Rate (L/min) 1.0 1.5 2.0 2.5 3.0
Filter/Pore Size (μm)
25-mm MCE, 0.8 6 9 12 15 18
25-mm MCE, 0.45 14 22 28 35 40
37-mm MCE, 0.8 23456
37-mm PVC, 5.0 11222.5
(varies with baery capacity
and level of discharge)

3
Flow Fault: If the pump is unable to compensate for longer than 15 seconds due to exces-
sive back pressure, the pump enters flow fault. During flow fault, the pump stops,
displays FLOW FAULT, pauses timing functions, and displays elapsed time or
pump time. Auto-restart is attempted up to 5 times.
Low Battery Fault: Pumps stops, displays LO BATT, pauses timing functions, and displays elapsed
time or pump time.
Battery Test: LCD shows battery condition prior to sampling.
Time Display: LCD displays up to 9999 minutes (6.8 days) at which point the display rolls over
to 0. Displays include sampler run time in minutes for sampling period elapsed
time, pump run time, or total elapsed time including delayed start
Timing Accuracy: ± 0.05% (± 45 seconds per day)
Timed Shutdown: Allows user to select minutes of operation before automatic shutdown.
Timed shutdown maximum setting is 9999 minutes (6.8 days).
Sampling Pause (Hold): Allows user to temporarily halt sampling without loss of timing data. Restart does not
require resetting time.
Delay On: Allows user to select minutes to delay test up to 9999 minutes (6.8 days)
Intermittent Sampling: Programmable to allow user to extend short-term samples over an extended period
of time to meet time-weighted average (TWA) requirements with a reduced number
of samples. Elapsed time maximum setting is 9999 minutes (6.8 days), at which time
the sample pump shuts down.
Tubing: Requires 1/4-inch ID tubing
CE marked UL Listed
ATEX-approved models available

4
Table 2. Pump Run Time in Hours with NiMH Battery
Following are typical run times achieved when using a fully charged nickel-metal
hydride (NiMH) battery pack. Data is sorted by type of sample media. All run times
are listed in hours. Results obtained using a new pump and new fully charged
battery. Pump performance may vary.
Note
Mixed Cellulose (MCE) filter, 0.8-μm pore size
Flow Rate (L/min)
Filter Diameter
37 mm 25 mm
2.0 37 33
2.5 34 26
3.0 31 21
3.5 29 18
4.0 25 15
4.5 20 14
Polyvinyl Chloride (PVC) filter, 5.0-μm pore size
Flow Rate (L/min)
Filter Diameter
37 mm 25 mm
2.0 47 41
2.5 38 33
3.0 35 30
3.5 26 27
4.0 22 25
4.5 21 23
Increases in back pressure during sampling due to buildup of sample
on the filter can decrease baery life.
Table 1. Pump Run Time in Hours with NiCad Battery
Following are typical run times achieved when using a fully charged nickel-
cadmium (NiCad) battery pack. Data is sorted by type of sample media. All run
times are listed in hours. Results obtained using a new pump and new fully
charged battery. Pump performance may vary.
** Filter back pressure exceeded pump capability during testing.
Increases in back pressure during sampling due to buildup of sample
on the filter can decrease baery life.
Note
Mixed Cellulose (MCE) filter, 0.8-μm pore size
Flow Rate (L/min)
Filter Diameter
37 mm 25 mm
2.0 24.1 16.3
2.5 21.4 14.5
3.0 19.1 11.0
3.5 17.8 10.7
4.0 15.4 **
4.5 14.6 **
Polyvinyl Chloride (PVC) filter, 5.0-μm pore size
Flow Rate (L/min)
Filter Diameter
37 mm 25 mm
2.0 31.6 21.7
2.5 27.7 24.0
3.0 27.0 18.6
3.5 22.8 16.4
4.0 19.4 16.2
4.5 19.0 14.6

5
Operation
High Flow Applications (1000 to 5000 ml/min)
Setup
Install battery (see Installing the Battery Pack on page 21). For optimum
charge, ensure pump is not running. Charge the battery by connecting the
charger plug to the sampler charging jack (Figure 1, #22). Ensure that the
battery is fully charged before sampling.
After charging the battery pack, it is good practice to run the pump for
approximately five minutes before calibrating. This ensures the battery is in more
steady-state conditions and improves the agreement in pre
and post-sampling calibrations.
Do not charge or operate pump from charger in hazardous
locations.
Use only an SKC-approved charger designated for this
model to ensure reliable performance. Failure to do so
voids any warranty.
Ensure proper orientation of charge cable before plugging
it into the charging jack. Improper orientation/contact will
short-circuit the battery and voids any warranty.
Short-circuiting the battery pack will render it immediately
inoperative.
Failure to follow warnings and cautions voids any warranty.
The battery pack may be kept on the SKC-approved charger
for an indefinite time.
1
Charger and battery
pack connected
13
AIRCHEK
SAMPLER
5
4
3
2
1
SAMPLE PERIOD Ñ MINUTES
START
HOLD
FLOW
AND
BATTERY
CHECK
DIGIT
SET
PUMP
RUN
TIME
DIGIT
SELECT
TOTAL
ELAPSED
TIME
SET-UP MODE
FLOW
ADJ
ON
AIRCHEK SAMPLER
MODEL 224-PCXR8
UL
¨
LISTED 124U
11
22
18
BACK
TOP
FRONT
12
8
7
6
5
4
3
2
20
20
19
2 Flow and battery check key
3 Start/hold key
4 Mode key
5 Set-up key
6 Digit set/pump run time key
7 Digit select/total elapsed
time key
8 On/off switch
11 Flow adjustment screw
12 Accessory mounting screws (2)
13 Intake/filter housing
18 Cap screw to regulator
19 Cap screw to air discharge port
20 Battery pack screws (2)
22 Charging jack
Figure 1
Front, back, and top views of PCXR8 Sampler
For additional drawings, see pages 25 and 27.

6
De-activating the Regulator
To ensure the pump is set for high flow,
remove the cap screw (Figure 1, #18)
covering the regulator valve and turn the
exposed screw clockwise until it stops.
(Do not overtighten.)
Replace the cap screw. The pump is
now set for high flow.
Setting or Verifying Flow Rate
Before use, allow pump to equilibrate after moving it from one temperature
extreme to another.
Ensure pump has run for
five minutes before pro-
ceeding with calibration.
Using 1/4-inch Tygon®
tubing, connect the sam-
pling medium to the pump
intake (Figure 1, #13).
Remove the tamper-resis-
tant cover. Start the pump
using the On/Off switch
(Figure 1, #8). Press Start/Hold
(Figure 1, #3). Press Flow and Battery Check (Figure 1, #2). Ad-
just the flow using the flow adjustment screw (Figure 1, #11) until
the built-in rotameter reads 2 L/min. The LCD should indicate
BATT OK in the upper left corner (if it doesn’t, recharge the bat-
tery). Press Flow and Battery Check to place the pump in Hold.
Connect a calibrator to the intake of the sampling medium.
Press Flow and Battery Check to start the pump, and set the flow
rate using the flow adjustment control (Figure 1, #11).
When the flow rate is set, press Flow and Battery Check to place
the pump in Hold. Disconnect the calibrator.
Replace the sampling medium used for calibration with an
unexposed medium for sample collection.
Calibration train with
filter cassette
2
3
Flow
adjustment
control
On/Off
switch
Tubing
Calibrator
Sample
media
For high flow,
turn valve screw clockwise.

7
Programming Delayed and Intermittent
Sampling
To enter Delayed Start Mode:
From Hold, press Set-up. Enter
the number of minutes delay (up
to 9999) before the sampling
period begins by pressing Digit
Select and Digit Set. Digit Select
advances the flashing digit and
Digit Set increases the value of the
flashing digit.
To enter Sample Period Mode:
Press Mode. Press Digit Select
and Digit Set to enter the sampling
time period in minutes (up to
9999). Note: The sample period is
the total period in which sampling
is performed and not the pump run
time.
To enter Pump Period Mode:
Press Mode. This is the actual
running time of the pump. Use
Digit Select and Digit Set to enter
the pump run time in minutes (up
to 9999).
Intermittent Sampling Options:
Option 1 - Sample Period and
Pump Period Both > 10 Minutes
Ensure the Sample Period and Pump Period are set to be greater
than 10 minutes. Set the Pump Period for less time than the
Sample Period to initiate intermittent sampling. The pump will
automatically calculate pump “off” time and run 10 equal cycles
of “on” and “off” over the sampling period beginning with the
first “on” time. Delayed start may be used with this option.
Option 2 - Sample Period and Pump Period Both < 10 Minutes
Ensure the Sample Period and Pump Period are set to be less than
10 minutes. The minimum “on” or “off” time setting is one minute.
4
PCXR8 Keypad
continued on page 8

8
Set the Pump Period for less time than the Sample Period to initiate
intermittent sampling. The pump will automatically cycle “on” and
“off” at one-minute intervals adjusting the final “on” or “off” time
to as many minutes as needed to reach the total programmed time.
If intermittent sampling is not desired, set the Sample Period to
equal the Pump Period.
Pressing Mode will scroll through the program sequence.
For intermittent sampling, the elapsed time maximum setting is
9999 minutes (6.8 days), at which time the sample pump will
shut down.
4
(cont’d)
Sampling
Before use, allow pump to equilibrate after moving
it from one temperature extreme to another.
Protect sample pump from weather when in use
outdoors.
Use of any device other than the approved bat-
tery pack to power the pump voids the UL List-
ing for intrinsic safety and any warranty.
For personal sampling, clip the sample
collection medium to the worker in the
breathing zone.
While the LCD displays HOLD, start
sampling by pressing Start/Hold. If a time delay has been
programmed, DELAYED START will flash on the LCD and
the amount of time remaining until sampling starts will appear.
SAMPLE RUNNING will display when the delay sequence has
ended. The LCD will automatically track sampling period time
elapsed.
At the end of the sampling period, press Start/Hold and record
the stop time.
Clip sample medium
to worker and pump to
belt.
continued on page 9
5

9
User Options During Sampling
Pause - Pause (shutdown) the pump by pressing Start/Hold. All
timing data will freeze. To resume sampling, press Start/Hold;
timing data will resume.
Flow or Battery Fault Shutdown - If the pump is unable to
compensate due to excessive back pressure or a low battery
condition exists the sampler will shut down. HOLD will display
on the LCD and timing functions will pause, but continue to display
total elapsed time or pump time when buttons are pressed. LO
BATT or FLOW FAULT will display on the LCD depending on
the cause of the shutdown. Fifteen seconds after flow fault shut
down, the pump will attempt to restart up to five times. To restart
from flow fault, correct the blockage and press Start/Hold. If LO
BATT is displayed, recharge the battery before sampling.
Display Times - Elapsed sampling period is continuously
displayed on the LCD. Press and hold Pump Run Time
(Figure 1, #6) to display pump run time. Press and hold
Total Elapsed Time (Figure 1, #7) to display total elapsed
time, including delayed start time.
Sampling with Impingers
When using impingers, place an in-line trap
between the pump and the impinger to protect
the sampler from liquid or vapors. The impinger
and trap can be mounted to the sampler using
the accessory mounting screws (Figure 1, #12)
or placed in a holster at the worker’s waist.
Failure to use the impinger trap voids any warranty.
Protect sample pump from weather when in use outdoors.
Use of any device other than the approved battery pack to power
the pump voids the UL Listing for intrinsic safety and any warranty.
Impinger holder on
pump with impinger
and trap
5
(cont’d)
Pressure Applications (Bag Sampling)
When using the pump for pressure
applications, such as bag sampling, thread the
exhaust port fitting supplied with the pump
into the air discharge port on top of the pump
(Figure 1, #19); hand tighten only. Using
PTFE tubing, connect the inlet of the sample
medium (e.g., sample bag) to the exhaust
port fitting on the pump. Turn on the pump
to collect the appropriate volume of air. Shut
off pump and close inlet on sample medium
to stop sampling.
Thread exhaust
port fitting into air
discharge port on
pump.

10
Low Flow Applications (5 to 500 ml/min)
Using Single Adjustable Low Flow Holder
Setup
Install battery (see Installing the Battery Pack on page 21). For optimum
charge, ensure pump is not running. Charge the battery by connecting the
charger plug to the sampler charging jack (Figure 1, #22). Ensure that the
battery is fully charged before sampling.
After charging the battery pack, it is good practice to run the pump for
approximately five minutes before calibrating. This ensures the battery is in
more steady-state conditions and improves the agreement in pre and post-
sampling calibrations.
Do not charge or operate pump from charger in hazardous
locations.
Use only an SKC-approved charger designated for this
model to ensure reliable performance. Failure to do so
voids any warranty.
Ensure proper orientation of charge cable before plugging
it into the charging jack. Improper orientation/contact will
short-circuit the battery and voids any warranty.
Short-circuiting the battery pack will render it immediately
inoperative.
Failure to follow warnings and cautions voids any war-
ranty.
The battery pack may be kept on the SKC-approved charger
for an indefinite time.
13
AIRCHEK
SAMPLER
5
4
3
2
1
SAMPLE PERIOD Ñ MINUTES
START
HOLD
FLOW
AND
BATTERY
CHECK
DIGIT
SET
PUMP
RUN
TIME
DIGIT
SELECT
TOTAL
ELAPSED
TIME
SET-UP MODE
FLOW
ADJ
ON
AIRCHEK SAMPLER
MODEL 224-PCXR8
UL
¨
LISTED 124U
11
22
18
TOP
FRONT
12
8
7
6
5
4
3
2
20
20
19
2 Flow and battery check key
3 Start/hold key
4 Mode key
5 Set-up key
6 Digit set/pump run time key
7 Digit select/total elapsed
time key
8 On/off switch
11 Flow adjustment screw
12 Accessory mounting screws (2)
13 Intake/filter housing
18 Cap screw to regulator
20 Battery pack screws (2)
22 Charging jack
Figure 1
Front, back, and top views of PCXR8 Sampler
For additional drawings, see pages 25 and 27.
1
Charger and battery
pack connected

11
Activating the Regulator
Remove the tamper-resistant cover.
Start the pump using the On/Off
switch (Figure 1, #8). Press Start/
Hold (Figure 1, #3). Press Flow and
Battery Check (Figure 1, #2). Adjust
the flow using the flow adjustment
screw (Figure 1, #11) until the built-
in rotameter reads 1.5 L/min. The
LCD should indicate BATT OK in
the upper left corner (if it doesn’t,
recharge the battery). Press Flow
and Battery Check to place the pump
in Hold.
Remove the cap screw covering the regulator valve
(Figure 1, #18) and turn the exposed screw four to five
turns counterclockwise.
Replace the cap screw. The pump is now set for low flow.
For low flow,
turn valve screw
counterclockwise.
2

12
Setting or Verifying Flow Rate
For a diagram of the pump, see Figure 1, page 5.
Before use, allow pump to equilibrate after moving it from one temperature
extreme to another.
Ensure pump has run for five minutes
before proceeding with calibration.
Connect a single adjustable low flow
holder (Figure 2) to the pump intake
(Figure 1, #13) using 1/4-inch Tygon
tubing.
Insert an opened sorbent tube (Figure 2, #3) into the rubber
sleeve (Figure 2, #2) of the low flow holder with the arrow on the
tube pointing toward the holder.
Connect a calibrator to the exposed end
of the sorbent tube.
Loosen the brass flow adjust screw on
the low flow holder. Activate the pump by
pressing Flow and Battery Check.
Adjust the flow rate by turning the flow adjust
screw (Figure 2, #1) on the holder until the
calibrator indicates the desired flow.
Do not adjust the flow on the pump. Adjust the flow only by using the
flow adjust screw on the low flow holder.
Calibration train with tube
in low flow holder
Figure 2
Single Adjustable
Low Flow Holder
with sample tube
1 Flow adjust screw
2 Rubber sleeve
3 Sorbent tube

Airflow



3
Turn screw on
low flow holder to
adjust flow.
Flow adjust
screw
continued on page 13

13
When the desired flow is set, place the pump in Hold by pressing
Flow and Battery Check. Disconnect the calibrator. Replace
the sorbent tube used for setting the flow with a new unexposed
sorbent tube for sample collection.
Place the appropriate size tube cover over the tube, and screw it
into place on the low flow holder.
Programming Delayed and Intermittent
Sampling
To enter Delayed Start Mode: From
Hold, press Set-up. Enter the number
of minutes delay (up to 9999) before
the sampling period begins by pressing
Digit Select and Digit Set. Digit Select
advances the flashing digit and Digit Set
increases the value of the flashing digit.
To enter Sample Period Mode: Press
Mode. Press Digit Select and Digit Set to
enter the sampling time period in minutes
(up to 9999). Note: The sample period
is the total period in which sampling is
performed and not the pump run time.
To enter Pump Period Mode: Press
Mode. This is the actual running time of
the pump. Use Digit Select and Digit Set
to enter the pump run time in minutes (up
to 9999).
Intermittent Sampling Options:
Option 1 - Sample Period and Pump Period Both > 10 Minutes
Ensure the Sample Period and Pump Period are set to be greater
than 10 minutes. Set the Pump Period for less time than the
Sample Period to initiate intermittent sampling. The pump will
automatically calculate pump “off” time and run 10 equal cycles
of “on” and “off” over the sampling period beginning with the
first “on” time. Delayed start may be used with this option.
Option 2 - Sample Period and Pump Period Both < 10 Minutes
Ensure the Sample Period and Pump Period are set to be less than
10 minutes. The minimum “on” or “off” time setting is one minute.
4
PCXR8 Keypad
3
(cont’d)
continued on page 14

14
Sampling
Before use, allow pump to equilibrate after
moving it from one temperature extreme to
another.
Protect sample pump from weather when in
use outdoors.
Use of any device other than the approved
battery pack to power the pump voids the UL
Listing for intrinsic safety and any warranty.
For personal sampling, clip the low flow
holder to the worker in the breathing zone.
While the LCD displays HOLD, start
sampling by pressing Start/Hold. If a time delay has been
programmed, DELAYED START will flash on the LCD and
the amount of time remaining until sampling starts will appear.
SAMPLE RUNNING will display when the delay sequence has
ended. The LCD will automatically track sampling period time
elapsed.
At the end of the sampling period, press Start/Hold and record
the stop time.
To return to high flow, remove the low flow holder and
deactivate the regulator (see page 6).
For user options during sampling, see page 9.
Clip holder to worker
and pump to belt.
5
Set the Pump Period for less time than the Sample Period to initiate
intermittent sampling. The pump will automatically cycle “on” and
“off” at one-minute intervals adjusting the final “on” or “off” time
to as many minutes as needed to reach the total programmed time.
If intermittent sampling is not desired, set the Sample Period to
equal the Pump Period.
Pressing Mode will scroll through the program sequence.
For intermittent sampling, the elapsed time maximum is 9999 minutes
(6.8 days), at which time the sample pump will shut down.
4
(cont’d)

15
Low Flow Applications (5 to 500 ml/min)
Using Multiple-tube Adjustable Low Flow Holder
Setup
For a diagram of the pump, see Figure 1, page 5.
Figure 3
Quad Adjustable Low Flow Holder
1 Anti-tamper cover
2 Flow adjust screws
3 Rubber sleeve
4 Sorbent sample tube
5 Protective cover
Top view of flow
adjust screws
1
Charger and battery
pack connected
Install battery (see Installing the Battery Pack on page 21). For op-
timum charge, ensure pump is not running. Charge the battery by
connecting the charger plug to the sampler charging jack (Figure
1, #22). Ensure that the battery is fully charged before sampling.
After charging the battery pack, it is good practice to run the pump for
approximately five minutes before calibrating. This ensures the battery is in
more steady-state conditions and improves the agreement in pre and post-
sampling calibrations.
Do not charge or operate pump from charger in
hazardous locations.
Use only an SKC-approved charger designat-
ed for this model to ensure reliable perfor-
mance. Failure to do so voids any warranty.
Ensure proper orientation of charge cable
before plugging it into the charging jack.
Improper orientation/contact will short-
circuit the battery and voids any warranty.
Short-circuiting the battery pack will
render it immediately inoperative.
Failure to follow warnings and cautions
voids any warranty.
The battery pack may be kept on the SKC-
approved charger for an indefinite time.
22
1
3
5
4

16
continued on page 17
Setting or Verifying Flow Rate
When performing multiple-tube sampling using an adjustable low flow
holder (dual, tri, or quad), ensure the regulator has been activated and the
pump flow rate is set at 1.5 L/min. The maximum flow rate through any one
tube is 500 ml/min*. Calculate the sum of all tube flow rates. If the sum is
≤1000 ml/min, proceed with calibration and sampling without any further
adjustment to pump flow rate. If the sum is > 1000 ml/min, set the pump
flow rate 15% higher than the sum of tube flow rates.
* Back pressure across some sample tubes can be higher than average. In these instances,
the maximum flow rate of 500 ml/min per tube may not be achieved.
Before use, allow pump to equilibrate after moving it from one temperature
extreme to another.
Ensure pump has run for five minutes before proceeding with
calibration.
Ensure the pump is set for low flow (see Activating the Regulator,
page 11).
Connect the adjustable low flow holder (Figure 3, page 15) to the
pump intake (Figure 1, #13) using 1/4-inch Tygon tubing.
Insert an opened sorbent tube into each rubber sleeve of the
low flow holder (Figure 3, #3 and 4) with the arrow on the tube
pointing toward the holder.
If sampling with fewer tubes than number of ports, insert unopened
sorbent tubes in the empty ports to seal them.
Note the flow rates specified by each sampling method and add
them together. If the sum is ≤1000 ml/min, proceed to the next
step. If the sum is > 1000 ml/min, multiply the total tube flow rate
by 1.15 and set the pump for that flow rate.
Connect a calibrator to the exposed end of a sorbent tube, loosen
the brass flow adjust screw on the low flow holder, and activate
the pump by pressing Flow and Battery Check.
Connect holder to
pump intake and tube
inlet to calibrator.
2

17
Turn the flow adjust screw (Figure 3, #2) for the appropriate port
of the low flow holder until the desired flow rate is achieved.
Turn clockwise to decrease the flow.
Do not adjust the flow on the pump. Adjust the flow only by
using the flow adjust screw on the low flow holder.
Do not exceed 500 ml/min flow rate per tube.
When the desired flow is set on the
initial tube, place the pump in Hold
by pressing Flow and Battery Check.
Remove the calibrator from the tube
and connect to the exposed end of
the next sorbent tube. Press Flow and
Battery Check and repeat the flow
adjustment process until all tubes are
flow calibrated. Changing the flow on
one tube will not affect the flow rate through the remaining tubes.
Do not exceed 500 ml/min flow rate per tube.
For tri and quad models, first rotate each anti-tamper cover
(Figures 3 and 4) to expose the flow adjust screws, then
adjust the appropriate screw until the calibrator indicates the
desired flow.
When the flow rate is set for each tube, press Flow and Battery
Check to place the pump in Hold and disconnect the calibrator.
Replace the sampling media used for calibration with unexposed
media for sample collection. Use a protective tube cover to
prevent tube breakage.
If sampling with fewer tubes than number of ports, insert unopened
sorbent tubes in the empty ports to seal them.
2
(cont’d)
Screw Screw
Figure 4
Cut-away of Tri/Quad Low
Flow Holder

18
Programming Delayed and Intermittent
Sampling
To enter Delayed Start Mode: From Hold, press Set-up. Enter
the number of minutes delay (up to 9999) before the sampling
period begins by pressing Digit Select and Digit Set. Digit
Select advances the flashing digit
and Digit Set increases the value
of the flashing digit.
To enter Sample Period Mode:
Press Mode. Press Digit Select
and Digit Set to enter the sampling
time period in minutes (up to
9999). Note: The sample period is
the total period in which sampling
is performed and not the pump run
time.
To enter Pump Period Mode:
Press Mode. This is the actual
running time of the pump. Use
Digit Select and Digit Set to enter
the pump run time in minutes (up
to 9999).
Intermittent Sampling Options:
Option 1 - Sample Period and
Pump Period Both > 10 Minutes
Ensure the Sample Period and
Pump Period are set to be greater
than 10 minutes. Set the Pump
Period for less time than the Sample Period to initiate intermit-
tent sampling. The pump will automatically calculate pump “off”
time and run 10 equal cycles of “on” and “off” over the sampling
period beginning with the first “on” time. Delayed start may be
used with this option.
Option 2 - Sample Period and Pump Period Both < 10 Minutes
Ensure the Sample Period and Pump Period are set to be less than
10 minutes. The minimum “on” or “off” time setting is one minute.
Set the Pump Period for less time than the Sample Period to initiate
intermittent sampling. The pump will automatically cycle “on” and
3
PCXR8 Keypad
continued on page 19