Assessments - 1, GPA: 4
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Facilidade de uso
Please refer to the Material Safety Data Sheet in the Appendix to learn about potential hazards and corrective action in case of accident. To install the cell: 1. Turn the unit off by placing the power switch (on the rear panel of the analyzer) in the OFF position. 2. Disconnect the red and black leads from the terminal strip. Remove the spent cell by pulling up on it and twisting slightly. 3. Remove the new Micro-Fuel Cell from its protective bag. CAUTION: Do not scratch, puncture, or damage the sensing membrane of the Micro-Fuel Cell sensor. Damage to the membrane will require replacement of the sensor. 4. Attach the red lead of the new cell to terminal #1 and the black lead to terminal #2. 5. Replace the cell on the cell holder by pushing and twisting until it strikes bottom. TELEDYNE BROWN ENGINEERING Analytical Instruments 2.0 Installation & Operation 319R Setting Alarms The alarms can be adjusted over the full scale range, and they are set as a percent of full scale. Thus, an alarm set to indicate 192 on the display while on the 200 PPM O2 range will activate at 192 PPM O2 on the 200 PPM Orange and at 1920 Oon the 2000 Orange (96% of full scale). To 2 2 2 set the alarms: 1. Place the range switch located below the front panel display in the 2000 PPM range position (or highest range available). 2. Place the power switch in the ON position. 3. To set the high alarm, hold down the SET HI ALARM button while turning the potentiometer to the right of the button until the display reads the desired concentration. 4. To set the low alarm, hold down the SET LO ALARM button while turning the potentiometer to the right of the button until the display reads the desired concentration. 5. Remember, the System/Cell Failure alarm is factory set at 2% of full scale; should this alarm trigger, the LED to the left of the front panel display will blink. TELEDYNE BROWN ENGINEERING Analytical Instruments 319R Installation & Operation 2.0 Calibration To calibrate the 319R: 1. Place the power switch in the ON position. 2. Allow the LCD reading to stabilize. 3. Expose the sensor to ambient air (20.9%) or instrument grade air. If the analyzer goes overrange, the display will go blank and the LED to the left of the display will blink. Hold down the SPAN button until the LED stops blinking. 4. While holding down the SPAN AT 20.9% button, adjust the potentiometer to the right of the button until the display is stable and reads 20.9%. 5. Release the button. The unit is now calibrated. 6. The alarms will be disabled for about 25 seconds after the SPAN button is released. Disabling the alarms allows air to be purged from the sample system without tripping any alarm set below span, or 21%. NOTE: Do not attempt to adjust any alarm setpoints while the alarms are disabled during the 25-second period. TELEDYNE BROWN ENGINEERING Analytical Instruments 2.0 Installation & Operation 319R TELEDYNE BROWN ENGINEERING Analytical Instruments 319R Maintenance 3.0 Maintenance Replacing the Fuse If the unit will not turn on when plugged in and switched ON (via the power switch), or you suspect a blown fuse, replace the fuse using the following procedure: 1. Disconnect the AC power and place the power switch located on the rear panel in the OFF position. 2. The fuse is located next to the power cord receptacle in the upper left-hand corner of the rear panel. Remove the power cord from the receptacle. 3. Insert a small flat-blade screwdriver into the slot in the receptacle wall nearest the fuse and gently pry open the fuse receptacle. The fuse holder will slide out. The fuse in use is visible in the clip. To open the spare fuse compartment, push on one end until it slides out. 4. Remove the bad fuse and replace it with a 5X20 mm 1A, 250V fast acting fuse for AC units (TBE P/N F-1189 ), or 1/2A fast acting fuse for DC units (P/N F-51). Figure 5-1: Replacing the fuse (AC power). TELEDYNE BROWN ENGINEERING Analytical Instruments 3.0 Maintenance 319R 5. Replace the fuse holder into its receptacle, pushing in firmly until it clicks. In units with DC power, the fuse is located on the rear panel above the ON/OFF switch. Open the fuse holder by unscrewing and removing the knob marked FUSE. The fuse will be located inside the knob. Replacing the Sensor The characteristics of the Micro-Fuel Cell are similar to those of a mercury battery in that both provide an almost constant output through their useful life, and then fall off sharply towards zero at the end. If the sample being analyzed has a low oxygen concentration, cell failure will probably be indicated by the inability to properly calibrate the analyzer. You will find that very little adjustment of the span potentiometer will be required to keep the analyzer calibrated properly during the duration of a given cell’s useful life. If large or many turn adjustments (clockwise) are required to calibrate the instrument, or calibration cannot be achieved within the range of the control, the cell needs replacing. ...