Veeco MS40 Operation And Maintenance Manual page 134

Portable automatic leak detector

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7.4 RECORDER

This standard requires that the output of the gas analyzer being tested be

graphically presented by means of chart recorder. The recorder shall be an

instrument which traces a continuous line and which has a time constant

(63%) not greater than one second. The recorder shall be so buffered that

there is no interaction between the recorder and the meter or other output-

indicating device of the gas analyzer; i.e., so that the velocity of response

of neither generates sufficient electrical signal to affect the indication of

the other. If the recorder is connected in parallel with the output indicator,

this interaction will become negligible if each has an input resistance 1000

times that of their common voltage source, or if the recorder draws 1/1000

as much current as the indicator.

While some recorders have automatic decade-switching capabilities, it

will be assumed that this recorder can cover only a single linear range; it

is also assumed that the recorder displacement is proportional to the input

current. In those cases where the analyzer has an output meter, controls

shall be available which permit adjusting the zero of the recorder to the

zero of the meter, and full-scale deflection of the recorder to full-scale

deflection of the meter. This is necessary to permit direct correlation of

the meter and recorder indications and also to prevent possible injury to

one or more of these devices. However, in order to prevent complications

in the language of this standard, it will be assumed that the recorder is the

only output indicating device, and that controls for adjusting zero

indication and for attenuating output indication act directly on the

recorder.

Vacuum Instrument Corp.

2099 Ninth Avenue

Ronkonkoma, NY 11779

631.737.0900

1109-186-00 Rev. C

b-xii

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