Black & Decker MULTI-GAS DETECTORS Manual do Operador descarregar pdf (Página 26)

Page 15

CALIBRATION

GENERAL: The BW DEFENDER, designed for easy calibration, will automatically set

span and zero. The LCD advises you as each automatic function takes place and

when to apply calibration gas.

IMPORTANT: BW DEFENDERMUST BE CALIBRATED USING GAS CONTAINING

CONCENTRATIONS OF TEST GASES THAT ARE EQUAL TO THE

FOLLOWING PRESET VALUES: Hydrogen Sulfide - 25 ppm, Carbon

Monoxide - 100 ppm, Methane (EX) - 2.5% (50% LEL), and Oxygen

) - 20.9%.

NOTE 1: BW DEFENDER Quad Gas is available from BW Technologies. If

calibrating only 1, 2 or 3 sensors - the test gas concentrations must be

equal to the above for the target sensor(s).

RECOMMEND: Calibrate every month depending on use and sensor exposure to

poisons and contaminants.

WARNING: Do not calibrate a BW DEFENDER which is in Low Battery Alarm. Do not

remove the Battery from the detector during calibration. Doing so will cause all NEW

calibration information to be lost, leaving the old calibration settings.

1. Calibrate only in a clean, normal environment free of background gases.

2. Place a fully charged battery in the unit. Turn the BW DEFENDER on. Allow at

least two minutes for the sensors to stabilize.

3. To activate: Press and hold down both the and (ON and TAB) keys down

together until the word “CAL” appears on

screen (4 seconds). The BW DEFENDER will

beep and flash the alarm LEDs advising

calibration is being initiated. As well, the icons

for AUTO ZERO, AUTO SPAN and Gas Bottle

are displayed.

NOTE 2: If BW DEFENDER is password protected,

enter the password before “CAL” is displayed

(See “Password Protection”).

4. AUTO ZERO: One beep will announce AUTO

ZERO has begun. Gas specific LCDs will

display zeroes. The AUTO ZERO icon will flash

(approx. 5 seconds). The unit is now zeroed.

ALARM SETPOINTS

GENERAL: Each gas detected has two user-settable alarm points. Each setpoint can

be individually adjusted by the user. Each set of alarm setpoints control different as-

pects of the BW DEFENDER'S behavior, as described below. Alarm setpoints can be

password protected.

NOTE: An alarm level can be disabled by setting that alarm setpoint to zero.

TABLE 2: Alarm Setpoints Parameters and Factory Default Setpoints

Description of Sensor Alarm Setpoints

OXYGEN: The LOW alarm setpoint controls the one (1) Deficiency alarm, while the

high alarm setpoint controls the one (1) Enrichment alarm. If the oxygen level

drops below the LOW alarm setpoint, the unit will enter LOW alarm. If the oxy-

gen level rises above the HIGH alarm setpoint, the unit will enter HIGH alarm.

Caution 1: It is not possible to set both alarms as deficiency alarms, or both alarms

as enrichment alarms. Doing so will cause the unit to remain permanently in

alarm until the alarm levels are reset.

EXPLOSIVE (Combustibles): The two alarm setpoints for the explosive gas sensor

controls the level at which the unit enters LOW alarm and HIGH alarm.

TOXICS: For H

S and CO, the LOW alarm setpoints control both the instant LOW

alarm level and the TWA (time-weighted-average) alarm level. When the LOW

alarm setpoint is exceeded, the unit will enter LOW alarm. If the accumulated

TWA level should exceed the LOW alarm setpoint, the unit will enter HIGH

alarm.

Caution 2: The INSTANTANEOUS LOW alarm setpoint and the TWA alarm setpoint

are identical. It is not possible to set the LOW alarm at one level, and TWA

alarm at a different level. Setting the LOW alarm setpoint OFF will disable the

TWA alarm. The toxic INSTANTANEOUS HIGH alarm setpoint controls the

level at which the unit will enter HIGH alarm.

Gas Monitored

Symbol

Alarm Levels

(EX: Factory default setpoints

Low TWA High

Oxygen O

Deficiency

Enrichment

2&4-gas

Explosive Gases EX (10% LEL)

(20% LEL)

Carbon Monoxide CO (35 ppm) (35 ppm) (200 ppm)

4-gas

Hydrogen Sulfide H

S (10 ppm) (10 ppm) (15 ppm)

Model

23 12

Tab

1 2 ... 21 22 23 24 25 26 27 28 29 30 31 ... 39 40

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Black & Decker MULTI-GAS DETECTORS Manual do Operador Página 26

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