CM572 CM572-DP CM572-DP-XC ABB AC500 PLC communication module

CM572 CM572-DP CM572-DP-XC ABB AC500 PLC communication module

CM572 CM572-DP CM572-DP-XC ABB AC500 PLC communication module

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Information in this section enables the user to design the sample transport tubing

connected between the TCR Sample Probe and installed NGC. Minimizing

transport “l(fā)ag time” and maintaining a single vapor phase sample are important

factors to consider when selecting transport tubing.

Lag time is the time required to purge out one volume of transport tubing and the

volume of the sample conditioning system.

1.7.1 Tube Quality

Use only good quality clean stainless steel chromatographic grade transport

tubing for carrier, calibration gas and sample lines. Use of poor quality stainless

steel tubing gives unsatisfactory results.

Do not use any type of plastic, Teflon or Teflon lined braided

steel tubing.

Transport tubing must be chromatographically clean. Tubing should be free of

hydrocarbon contamination and particle free. During cutting, fitting and deburring,

the technician should insure that no particles are allowed to remain in the tubing.

1.7.2 Calculation

Sample transport lag time estimated calculations do not consider the volume of

the sample conditioning system. However, the following equation can be used as

a quick method to estimate lag time because normal transport tubing volume is

much greater than sample conditioning system tubing volume.

[ ]

Actual Sample Flow Rate (cc / min.)

(Volume cc per Foot of Tubing) (Feet of Tubing) Lag Time × =

For a detailed method of calculating lag time, see the next section, Calculating

Lag Time.

1.7.3 Analysis Time

If analysis results are used for process control or custody transfer, it is important

to minimize the amount of time that the sample spends in transit from the TCR

sample probe to NGC. To arrive at the total cycle time between representative

samples, sample transit time must be added to NGC cycle time.

1.7.4 Transit Volume

The total volume of sample gas in transit is calculated by multiplying volume per

foot of sample transport tubing by total length of tubing. To assist in making these

calculations, refer to Table 1–6 for internal volume of commonly used sample

transport tubing.