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Resumen del manual
Figure 2. BatteryInstallation If batteries are accidently installed in the wrong polarity, a positive temperature coefficient (PTC) thermistor will protect the instrument’s electronic circuity. The instrument will operate once batteries are properly installed and the PTC thermistor is allowed to cool. 3.2 Probe Installation The probe comes disassembled. To add the probe tip: a. Loosen but DO NOT REMOVE the Knurled Nut (03-2023) on the main part of the Probe Assembly (19-3076). b. Insert probe tube into Extended Adapter Block (19-3072). c. Hand tighten the Knurled Nut (03-2023) then add 1/4 turn to snug probe to the rest of the probe assembly. NOTE: In order to prevent the possibility of misplacing the Front (03-2024) and Back (03-2025) Ferrules, loosen but DO NOT REMOVE the Knurled Nut (03-2023) before inserting or removing the Probe Tube (19-3073). Install the probe by sliding the end of its tubing over the gas inlet port on the top right side of the instrument as shown in Figure 3. The tubing may be difficult to slide over the gas inlet port of the unit for the first time. This was done intentionally to allow for a snug fit. Use a little dish washing liquid diluted in water or heat the end of the tube in hot tap water to help it slide onto the port. Figure 3. Probe Installation 4 OPERATION To operate the Dioxor II, you simply . . . • Set its POWER switch to ON, • Wait for the instrument to warm up (approx. 1 minute), • Zero the display (if necessary), • Take a gas sample. Detailed operating procedures are presented below: 4.1 Power ON/OFF Turn on the instrument by sliding its POWER switch to ON. Observe that when power is first applied, all numerical LCD segments are tested for 5-15 seconds; after which, the LCD shows the detected SO2 level. (A minus sign may appear during power up as the sensor stabilizes.) Turn off the instrument by sliding the POWER switch to OFF. Important! When storing the instrument for extended periods of time, remove the batteries and ensure that the POWER switch is OFF. The OFF position places a short across the SO2 sensor, thus keeping the sensor from being destabilized while not in use. 4.2 Zeroing the Instrument After being turned on and warmed up for at least 1 minute, the instrument should indicate 000 ±5 ppm in fresh air. If the instrument needs to be zeroed, proceed as follows: 1. Ensure that the instrument is sampling air that is free of sulfur dioxide. NOTE: An indication that the instrument was not zeroed in fresh air is when a large negative SO2 display appears when the instrument is moved into another area. 2. Using a 1/8" flat-blade screwdriver, turn the ADJUST potentiometer until the LCD shows 0 ppm. The display shows negative numbers for zeroing purposes. An instrument can be considered zeroed with a display bounce of up to ±3 ppm. 4.3 Backlight ON/OFF The LCD can be read in low-light areas by setting the front panel LIGHT switch to ON. The backlight stays on until turned off, or until the POWER switch is set to OFF. 4.4 Using the Strap The instrument's elastic strap allows the unit to be either hand-held, or hung on nearby objects. By sliding your hand between the instrument and its elastic strap, you can hold onto the Dioxor II with a minimum of effort. The instrument's front panel slide switches can then be actuated by your thumb for one- handed operation. Or, by releasing the metal clip at the bottom of the instrument's case, you can hang the instrument by its strap on nearby objects such as nails, sheet metal, or valve handles. 4.5 Using the Probe A rigid stainless steel probe with handle, connected to a flexible hose with sample filter can be used to draw a gas sample into the instrument from the room, boilers, and other combustible furnaces. Both hose and probe are detachable from the instrument when sampling without the probe, or when sampling with a different probe is desired. Important: If condensation is observed within the hose, do not allow water level to build up to a point where it cuts off flow. 4.6 Interpreting the Display Gas Display The LCD shows SO2 levels in the range from 0 to 1999 ppm. The display on the right indicates an SO2 level of 025 ppm. Overrange When the gas sample exceeds 1999 ppm, a “1” is displayed on the LCD. To clear an overrange condition, leave the instrument turned on and sample fresh air until the LCD returns to displaying SO2. Low Battery Indications When the battery voltage becomes low, the “LO BAT” indicator appears. Although the instrument will continue to operate and give SO2 readings under these conditions, the batteries should be replaced as soon as possible. When the battery voltage becomes too low for the instrument to operate, a “-1” is displayed on the LCD. No SO2 readings are provided under these conditions. 4.7 Long-Term Storage When storing the Dioxor II for extended periods of time, set its POWER switch to OFF and remove the batteries. The POWER OFF position places a short across the SO2 sensor, thus keeping i...
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