Biosystems PhD Ultra Manual de usuario descargar pdf (Pagina 11)

it will automatically launch the IrDA

connection subroutine so that data in the

instrument may be downloaded to

BioTrak.

2.5 Turning the ToxiLtd off

To turn the ToxiLtd off, press and hold the

MODE button. After 5 seconds, the

instrument will light up all segments on the

display. After 3 more seconds, the display

will show “IrDA”. Continue to hold the

MODE button for an additional 15

seconds after “IrDA” is shown. The

following screen will be shown after the

instrument is shut down.

Note: Turning the ToxiLtd off will have

no effect on the operational life of the

instrument. The ToxiLtd will operate

for 24 months from the activation date,

unless the instrument has exceeded 20

hours in alarm, regardless of whether

the instrument is turned on or off.

2.6 Sampling

The ToxiLtd may be used in either

diffusion or sample-draw mode. In either

mode, the gas sample must enter the

sensor compartment for the instrument to

In diffusion mode, the atmosphere

reaches the sensor by diffusing through

the sensor port on the front of the

instrument. Normal air movements are

enough to carry the sample to the sensor.

The sensor reacts quickly to changes in

the concentration of the gas being

measured.

It is also possible to use the ToxiLtd to

sample remote locations with the hand-

aspirated sample-draw kit that is available

separately. During remote sampling, the

gas sample is drawn into the sensor

compartment through the probe assembly

and a length of tubing.

2.6.1 Sample draw kit usage

1. Connect the shorter piece of hose

from the squeeze bulb to the sample

draw adapter. Connect the longer end

of the hose to the sample probe.

2. Attach the sample draw adapter to the

ToxiLtd.

3. Cover the end of the sample draw

probe assembly with a finger, and

squeeze the aspirator bulb. If there

are no leaks in the sample draw kit

components, the bulb should stay

deflated for a few seconds.

4. Insert the end of the sample probe

into the location to be sampled.

5. Squeeze the aspirator bulb several

times to draw the sample from the

remote location to the sensor

compartment. Allow one squeeze of

the bulb for every one foot of sampling

hose for the sample to reach the

sensors. Then continue to squeeze

the bulb for an additional 45 seconds

or until readings stabilize.

6. Note the gas measurement readings.

CAUTION: Hand aspirated remote

sampling only provides continuous

gas readings for the area in which the

probe is located when the bulb is

being continuously squeezed.

Note: Each time a reading is desired, it

is necessary to squeeze the bulb a

sufficient number of times to bring a

fresh sample to the sensor

compartment and to then continue

squeezing the bulb for an additional 45

seconds or until readings stabilize.

3. Calibration

The ToxiLtd features fully automated

calibration functions. Instruments require

both fresh air/zero and span calibrations.

The MODE button is used to initiate the

automatic calibration sequence.

Calibration adjustments are made

automatically by the instrument.

3.1 Verification of accuracy

Sperian recommends regular verification

of accuracy for all of our gas detection

products in order to maximize worker

safety. For a discussion of Sperian’s

Calibration Recommendations, see

Appendix C.

3.1.1 Verifying toxic sensor

performance

Verification is a two-step procedure for

ToxiLtd instruments equipped with a toxic

gas sensor.

Step one is to take the ToxiLtd to an area

where the atmosphere is known to be

fresh and perform a fresh air/zero

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