Biosystems PhD Ultra Manual de usuario descargar pdf (Pagina 6)

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1. Overview

The Biosystems ToxiLtd hereafter referred

to as the ToxiLtd is a single sensor gas

detector that is designed to detect either

carbon monoxide (CO) or Hydrogen

Sulfide (H2S). The ToxiLtd’s sensor type

is shown on the front of the instrument

and is also shown on the display during

the startup sequence or during Gas

Indicator mode.

ToxiLtd gas detectors are disposable

instruments that are designed to operate

for 2 full years from the date of activation.

ToxiLtd models must be activated within 6

months of the manufacturing date. If the

instrument is not turned on by the “must

be activated by date”, the instrument will

activate itself and the 2-year countdown

will begin automatically.

Upon delivery, the screen of the ToxiLtd

will be blank except for the negated horn

icon.

If the “must be activated by date” has

passed and the instrument has activated

itself, the instrument will show three lines

on the screen with the negated horn icon.

Contact Sperian or your distributor if

three lines are displayed when you first

receive the detector.

The ToxiLtd is delivered with a pre-

installed lithium thionyl chloride (LiSOCl

2

)

battery capable of powering the

instrument for the full 2 years of the

instrument’s operating life unless the

instrument exceeds the allotted alarm

time. After the 2-year instrument life cycle

is up, the instrument will turn itself off.

1.1 Methods of sampling

The ToxiLtd may be used in diffusion

mode, or with the manual sample draw kit

that is available separately. In either

mode, the atmosphere must reach the

sensor for the instrument to register a

reading. 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. During remote

sampling, the gas sample is drawn into

the sensor compartment through the

probe assembly and a length of tubing.

See section 2.6 for more details on

sampling the atmosphere.

1.2 Sensors

The ToxiLtd uses an electrochemical toxic

gas sensor which has been designed to

minimize the effects of common

interfering gases. These sensors provide

accurate, dependable readings for gases

commonly encountered in industrial

applications.

1.2.1 Sensor ranges and resolutions.

Sensor Range Resolution

CO 0-1000 PPM 1 PPM

H

2

S 0 -200 PPM 1 PPM

1.2.2 F1: Missing sensor during

startup

If the ToxiLtd fails to detect the sensor

during startup, it will show “F 1” with the

caution symbol following the software

version screen at startup. This is covered

in greater detail in section 2.1.3.

1.3 Alarm logic

1.3.1 Gas alarms

When an alarm set point is exceeded a

loud audible alarm sounds, the bright red

LED alarm light flashes and the display

will indicate whether it is a warning alarm

or a more serious danger alarm. If the

ToxiLtd is equipped with the optional

vibrating alarm, it will also be activated

during an alarm condition. Instruments

have two ascending alarm set points.

The lower alarm set point is the warning

alarm, while the higher alarm set point is

the danger alarm.

Sensor Warning Alarm Danger Alarm

CO 35 PPM 100 PPM

H

2

S 10 PPM 20 PPM

Default Warning and Danger Alarm Settings

1 2 3 4 5 6 7 8 9 10 11 ... 19 20

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