Adaptations of the Model 1130

1
Adaptations of the Model 1130 Model 1135 for
Polar Operation

• Frank Schaedlich

330 Nantucket Blvd. Toronto, Canada M1P 2P4
Rev 1.10 Nov 2003
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Operating in Polar Regions

• Operating these systems outdoors under some of
  the harshest conditions on the planet has
  presented some challenges !
• This is a summary of some of the conditions
  experienced by users and the solutions developed

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Internal Case Temperature

• Internal case temperature can sometimes drop to lt
  0 C
• Replace original 100 W case heater with new 200
  Watt unit
• Easy user retrofit (P/N 35-13833-200)
• Block case ventilation inlet
• Check, and, if necessary, block case ventilation
  outlet
• Do not block oven inlet or exhaust vents!

4
Exterior Vents

• Air leakage through exhaust vents
• Original oven and case exhaust vents were thin
  gauge aluminum
• Easy to damage while transporting
• Flapper could be deformed and possibly stick in
  the open position
• Ensure that flaps are free swinging and are
  operating properly
• Ensure that Model 1130 1135 are mounted
  perfectly upright!

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Freezing of Zero Air Components

• Either V1 and/or zero air delivery line (from V1
  to denuder) may freeze solid
• Requires a lot of moisture in the zero air for
  this to happen!
• Get air from driest available location
• Use dry outside air as source
• Purge zero canisters of moisture when moving them
  from temperate to arctic conditions

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Freezing of V1

• Also requires a lot of moisture in the air!
• Stand V1 off rear panel of case
• This is done on all current units
• Possible to do this modification in the field
• Replace V1 with larger orifice valve
• Factory retrofit
• Use new 200W case heater

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Freezing of Zero Air Line

• The only available solution here is to use dry
  outside air as zero air source
• Even if the internal line was moved, insulated,
  etc., the air would frost up somewhere inside
  external zero air components
• Must purge zero canisters of moisture when moving
  them from temperate to arctic conditions

8
Interior Moisture

• Water inside of unit due to the melting of
  ingested blowing snow
• Block case cooling inlets partially or entirely
• Check case exhaust vents for proper flapper seal
• Check door seal

9
External Inlet

• Impactor not being sufficiently heated
• Use new heated boot
• Accepts full 115 VAC line power
• Higher PID power limit
• May increase LEVL2 PL.1 power limit from default
  20 of up to 100, if required
• Use extra insulation around boot
• Boost setpoint temperature

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Denuder

• Denuder keep-warm does not maintain 50 C
• Set higher PID power limit
• Increase the LEVL2 PL.1 (keep warm) power limit
  from the default value of 5
• Check oven exhaust flap for proper operation

11
Door Seal

• Door is not sealing properly
• Use new CFlex sealing cord
• User installable TN-308
• Ensure that backing board is not warped

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Heated Transfer Line

• Heated Line does not maintain 50 C
• Nothing easy can done about this
• There is not enough power available to substitute
  a line with more than the standard 8 W/ft power
  rating
• However, this should not be a problem
• Sample line only contains elemental mercury
• Will always be well above the dew point of the
  ambient air
• No losses expected

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Summary

• There have been some unusual problems experienced
  with polar operation
• Most appear to have been resolved