Calibration Check Mode; Calibration Mode; Calibration Check & Calibration Modes - General Monitors 4802A Instruction Manual

Before using the 3-Liter Chamber, make sure the following are present:
1. 3-Liter Chamber
2. Dish
3. 250 micro-liter syringe
4. Correct volume of solvent/liquid for calibration and calibration checks.
• Orient the chamber so that the lid and sensor hole is on top.
• After injection onto the evaporation dish, the lid is fastened quickly to contain vapors
in the chamber.
• Placing the round General Monitors magnet onto the start switch locating post
operates the fan.
• Draw the correct amount of solvent or liquid into the syringe, according to the listing
in Section 6.6.
• Place the Model 4802A in the Calibration Check or Calibration Mode, following the
instructions listed in Sections 5.2 and 5.3.

6.2.7 Calibration Check Mode

1. When 0 is flashing on the display (Calibration Check Mode) inject the solvent/liquid
into the dish, reach underneath and behind the fan blades on the inside of the
chamber, locate the fan switch; turn it on and close the lid on the 3-Liter Calibration
Chamber.
2. As the sensor begins to respond to the combustible vapor in the chamber, the
concentration will begin flashing on the display.
3. The reading will stabilize after one or two minutes.
4. Remove the sensor from the chamber and allow it to see clean air. When the display
has stopped flashing and indicates a few % LEL and then zero (0), the Model 4802A
has returned to normal operation.

6.2.8 Calibration Mode:

1. When AC (Calibration Mode) appears on the display, inject the solvent/liquid into the
dish, reach underneath and behind the fan blades on the inside of the chamber,
locate the fan switch; turn it on and close the lid on the 3-Liter Calibration Chamber.
2. As the sensor begins to respond to the combustible vapor in the chamber, the
display will indicate CP (Calibration in Progress).
3. After one or two minutes the display will indicate CC (Calibration Complete).
4. Remove the sensor from the chamber and allow it to see clean air. When the display
indicates a few % LEL and then zero (0), the Model 4802A has returned to normal
operation.
6.2.9 Calibration Check & Calibration Modes
• Remove the Dish from the 3-Liter Chamber and clean thoroughly before using it
again.
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Model 4802A