Atec 8001, Руководство по эксплуатации и обслуживанию

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10 Atmospheric Technology
End Pressure
The final end pressure is the desired canister absolute pressure at the end of
sampling. This value is an absolute pressure that should be determined using the
atmospheric pressure at the sampling site or a pressure value that is 5 psi below the
pump pressure for the pressurized canister option. The end pressure must be at
least 2 psia below ambient pressure (or 5 psi below the pump pressure for
pressurized sampling) to insure that the canister is filled to the desired pressure at
the end of sampling. The sampler uses the specified end pressure to calculate the
necessary flow rate to fill the canister to this pressure.
Leak Rate Limit
The leak rate limit is the maximum increase in pressure that is allowed to pass a
canister during the manual leak check. This value is normally set to 0.1 psia/min.
Canister Volume
The nominal canister volume in liters is need to determine the flow rate.
Used Can Limit
The Model 8001 checks the pressure of each canister prior to sampling. The
pressure specified in the used can limit is used to determine if a used or leaking
canister has been installed. If the starting pressure is above this value, a used can
error status code will be set and sampling will be not proceed on this canister.
Purge Time
Purge time specifies the duration of purging before the start of sampling.
Data Write Interval
The Data Write Interval specifies the time interval for recording canister pressure
data. The minimum time interval is 5 minutes.