Biosystems PhD Ultra Manual de instrucciones descargar pdf (Pagina 23)

2.4.2.2 Protective “low flow” shut-downs

If a protective pump shut-down occurs, the following

steps should be taken before the instrument is put

back into use:

(1) Turn off the PhD Ultra detector and disconnect

the sample draw pump.

(2) Remove the sample draw assembly from the

area being monitored. Be careful to keep the

sample draw probe in a vertical position.

(3) Examine the sample draw probe and hose to

make sure no fluids remain trapped.

(4) Allow any trapped fluids to completely drain. (It

may be necessary to disconnect the hose or

sample draw probe before drainage can occur.)

(5) Replace the sample draw probe filters if

necessary.

(6) Re-attach the pump in fresh air and wait for

readings to stabilize.

(7) Resume sampling.

2.4.2.3 Resuming diffusion monitoring

In order to stop using the pump and resume

diffusion monitoring, simply disconnect the pump

assembly from the PhD Ultra. The audible and

visual alarms will be activated and the LCD will

display the message “Pump Disconnect”. Press the

mode button to acknowledge and resume normal

diffusion operation.

2.4.3 Sample probe assembly

The sample probe handle contains moisture barrier

and particulate filters designed to remove

contaminants that may cause harm to either the

continuous pump or the instrument. Never operate

the sample draw pump unless the hose and

probe assembly is attached!

Particulate contaminants are removed by means of

a cellulose filter similar to those used in filter

cigarettes. The hydrophobic filter includes a 0.1 µm

Teflon™ barrier which blocks the flow of moisture as

well as any remaining particulate contaminants.

Figure 2.4.3. PhD Ultra sample probe assembly

Sample probe filters should be replaced whenever

visibly discolored due to contamination, or when the

continuous pump “low flow” alarm indicates

blockage. A spare filter replacement kit (part

number 54-05-K0401) is included with every PhD

Ultra.

2.4.3.1 Changing sample probe filters

The threaded sample probe handle is unscrewed (as

shown in Figure 2.4.3.) to access the filters. The

particulate filter is held in place by means of a clear

filter bowl. To replace the particulate filter, remove

the old filter and bowl, insert a new filter into the

bowl, and slide the bowl back into place in the probe

handle. The hydrophobic barrier filter fits into a

socket in the rear section of the probe handle. (The

narrow end of the hydrophobic barrier filter is

inserted towards the rear of the handle.)

2.4.3.2 Changing sample probe tubes

The standard 11.5” long butyrate probe tube is held

in place by means of a hex-nut compression fitting

and compression sleeve. The standard probe tube

is designed to be easily interchangeable with other

custom length sections of 1/4” OD tubing, or probe

tubes made of other materials (such as stainless

steel).

Probe tubes are exchanged by loosening the hex-

nut compression fitting, removing the old tube,

sliding the compression sleeve into place around the

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Biosystems PhD Ultra Manual de instrucciones Pagina 23

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