Particle Measuring Systems AirSentry II IMS User manual

AirSentry® II IMS
Calibration Quick Guide
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How to Calibrate Your AirSentry II IMS
Figure 1 AirSentry II Calibration Station
Calibration Station
The AirSentry II Calibration Station allows users to calibrate the AirSentry II IMS to a specific calibration
stream concentration. An internal pneumatic diagram of the calibration station is included on page 9 for
reference, if needed.
To set up the calibration station:
1. Place the calibration station in the area where the AirSentry II IMS analyzers will be calibrated.
2. Unscrew the two flathead screws on the oven cover.
Figure 2 Oven cover screws
3. Remove the cover to the oven.
4. Using the supplied 15/16” socket and nut driver, unscrew the Teflon® nut allowing access to the
span oven.

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5. Carefully insert the permeation tube into the span oven, making sure to avoid touching the active
permeation areas (any exposed Teflon tubing).
Figure 3 Permeation Devices
6. Re-install the Teflon nut to the span oven.
Note Be careful to not cross-thread this nut.
7. Replace the cover to the span oven and re-install the two flathead screws.
8. Connect the power and supply CDA to the CDA fitting.
9. Verify that the LED on the front of the unit is lit when power is applied.
Note Aer installing the permeation tube, allow 24 to 48 hours elapse time prior to calibrating an
AirSentry II IMS analyzer. This time allows for the permeation device to warm up and near its
expected permeation rate. Most permeation tubes will have reached equilibrium five to seven
days aer installation. An accurate calibration can be completed at the time; however the
results should not be significantly dierent than a quick calibration aer 48 hours.
Periodic Checks of Calibration
The AirSentry II Calibration Station is also intended for periodic checks of the calibration of the AirSentry II
IMS. Two concentration points are typically checked, including a zero calibration and a span calibration.
• A zero calibration checks the oset on a clean, pure zero gas stream (such as CDA).
• A span calibration checks the value of the calibration point at the middle of the analyzer range (span).

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As an example, a 0 - 50 ppbv Amines analyzer would be span calibrated at 25 ppbv. The span
calibration provides a correction factor to adjust the calibration curve appropriately.
Because most users are sampling in a wet environment (where the RH > 5%), a wet span calibration is most
appropriate. The wet span calibration is accomplished with the Calibration Station by using chemically
filtered ambient air for the dilution gas. The following table details the best method for zero and span
calibration.
Calibration Type Ammonia/Amines Acids
Zero Calibration Dry Dry
Zero Calibration Wet Wet
Table 1 Zero and Span Calibration
Rocker Buttons on the AirSentry II Calibration Station
The configuration of the rocker buttons on the le front panel of the calibration station determines the
calibration gas output. Based on the rocker button settings, the calibration station will output a dry zero
calibration stream, a wet zero calibration stream, or a wet span calibration stream to the zero/calibrate
fitting at the back of the calibration station.
A schematic of the internal components of the calibration station is located on page 9.
Figure 2. Calibration Station: Rocker buttons

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Top Rocker Button
Bottom Rocker Button Calibrate Zero
Run Wet Span Calibration Wet Zero Calibration
Standby Should NOT be used.
(This will send a dry stream at 3.2
L/min diluted with 100 cc/min of
calibrant gas.)
Dry Zero Calibration
Table 2 Description of Rocker Buttons
As an example, when the rocker buttons are in the STANDBY and ZERO positions, the output from the zero/
calibrate fitting will be a dry zero calibration stream. When the rocker buttons are in the RUN and CALIBRATE
positions, the output from the zero/calibrate fitting will be a wet span calibration stream. The wet span
calibration stream can be adjusted using the needle valve located at the back of the calibration station.
Note: To understand how to properly set the needle valve to achieve the proper flow for span calibration,
refer to the “Permeation Devices” section that follows.
Note To understand how to properly set the needle valve to achieve the proper flow for
span calibration, refer to the “Permeation Devices” section that follows.
Calibration Procedure
The following steps detail the calibration procedure to ensure an accurate and reliable monitoring
instrument. The AirSentry II IMS was designed so that it can be easily calibrated by disconnecting it from its
sampling location and moving it to the location of the calibration station. The AirSentry II IMS is then set on
top of or next to the calibration station allowing the various utilities to be shared between the instruments.
Aer verifying the utilities are connected in the appropriate locations, a zero and/or span calibration can be
performed.

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Figure 4 AirSentry II IMS - Pneumatic Setup (With Calibration Station)

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To perform a zero calibration:
1. Verify that all utilities are connected and working properly for both the calibration station and the
AirSentry II IMS.
Note The best way to set the CDA pressure to 5 psi is to connect the AirSentry II IMS via
the Service Soware. The Press CDA column, located on the Control tab, digitally
indicates the CDA pressure in kilopascals. Adjust the regulator until this value
reads 34.5 kPa (± 1.5 kPa), which is equivalent to 5 psi.
2. Verify that the AirSentry II IMS has a source of vacuum installed on the vacuum fitting (33kPa
(Absolute).
3. Verify that the calibration station ZERO/SPAN fitting is connected to the SAMPLE fitting on the
AirSentry II IMS. This ZERO/SPAN fitting should have a “T” to allow venting of the excess flow, so
that the IMS cell remains at atmospheric pressure. A 12” service loop of ¼” (quarter-inch) PFA tubing
should be connected on the “T” at the ZERO/SPAN fitting for exhaust purposes.
4. Verify that the calibration station SPAN VENT fitting is not blocked.
5. Place the rocker buttons in the correct configuration for the type of zero calibration required.
Note For a dry zero calibration, the rocker buttons should be in the STANDBY and ZERO
positions.
6. Allow the system to stabilize for 30 to 60 minutes.
7. Press the Zero button on the AirSentry II IMS. The instrument will now begin the zero calibration
process.
You are now ready to perform a span calibration (outlined in the next section).

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To perform a span calibration
8. Verify that a zero calibration has been performed prior to beginning a span calibration. If needed,
refer to the previous section.
9. Re-verify that all utilities are connected and working properly for both the calibration station and to
the AirSentry II IMS.
10. Verify that the AirSentry II IMS has a source of vacuum installed on the vacuum fitting (> 15 in. Hg is
required).
11. Verify that the calibration ZERO/SPAN fitting is connected to the SAMPLE fitting on the AirSentry II
IMS. This ZERO/SPAN fitting should have a “T” to allow venting of the excess flow.
12. Verify that the calibration station SPAN VENT fitting is not blocked.
13. Place the rocker buttons in the correct configuration for the span calibration. All span calibrations
are performed using a wet (humid) dilution stream, and therefore the rocker button positions for
span calibration are the same for all analyzers.
Note For span calibration, the rocker buttons on the calibration station should be in
the RUN and CALIBRATE positions.
15. Verify that the flow from the calibration station ZERO/SPAN fitting is the same as that which is
calculated for the permeation rate of the tube inside of the calibration oven. If not, adjust the needle
value to obtain the correct flow for a 25ppbv calibration.
16. Allow the system to stabilize for 30 to 60 minutes.
Note Particle Measuring Systems recommends that the AirSentry II IMS has a five (5)
minute sample interval during the span calibration process.
17. Press the SPAN button on the AirSentry II IMS. The instrument will now begin the span calibration
process.
18. When the calibration process has completed, disconnect the AirSentry II IMS and return it to the
point-of-use monitoring location.

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Preventive Maintenance – AirSentry II Calibration Station
Calibration Station Service & Parts
Description Time Interval Part Number Quantity
Calibration Station Pump
Diaphragm Kit
1 Year 1000006584 1 per calibration system
Acids Permeation Tube 1 Year 1000012381 1 per calibration system
Ammonia Permeation
Tube
1 Year 1000006760 1 per calibration system
Amines Permeation Tube 1 Year 1000006760 1 per calibration system
Chlorides Permeation
Tube
2 Years 1000006749 1 per Chlorides
calibration system
Acids or Chlorides
Ambient Air Chemical
Filter Replacement
12 Months 1000012380 1 per calibration system
Amines or Ammonia
Ambient Air Chemical
Filter Replacement
12 Months 1000012097 1 per calibration system
Internal Chemical Filter
for Dilution Flow
1 Year 1000007127 1 per calibration system
Table 3 Maintenance schedule and part numbers - AirSentry II calibration station
1. Or, replace acids ambient air chemical filter at every span calibration.
2. Or, replace amines ambient air chemical filter at every span calibration.
3. Label on the internal chemical filter for dilution flow will state a replacement interval of 6 months. However, for the calibration
station, the recommended replacement interval for this part is 12 months.

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Calibration Station
A pneumatic diagram is included here for troubleshooting the AirSentry II calibration station, if
needed. However, it is highly unlikely that you will need to remove the lid of the calibration station for
troubleshooting purposes.
Figure 5 AirSentry II Calibration Station - Pneumatic Diagram

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Flowrates — Calibration Station
Typical flowrates for the calibration station’s various analyzers are described in Table 4.
Flow Type How to Measure Ammonia and
Amines (cc/min)
Acids (cc/min)
Span Oven Flow
Place calibration station into ZERO and either
RUN or STANDBY.
Measure flow at cal vent port.
~ 100 ~ 100
Wet Calibration
Flow
Place calibration station into CALIBRATE and
RUN.
Measure flow at zero calibrate port.
Determined by
permeation rate
and molar volume
of air at elevation
Determined by
permeation rate
and molar volume
of air at elevation
Dry Calibration
Zero Flow
Place calibration station into ZERO and
STANDBY.
Measure flow at zero/calibrate port.
~ 3200 ~ 3200
Wet Calibration
Zero Flow
Place calibration station into ZERO and RUN.
Measure flow at zero/calibrate port.
Note This is essentially measuring
the flow of the pump within the
calibration station.
Should be
approximately
100 cc/min
less than the
measured Wet
Calibration flow.
Should be
approximately 100
cc/min less than
the measured Wet
Calibration flow.
Table 4 Flowrates for AirSentry II Calibration Station’s various analyzers