Quest Technologies SafeLog 100 Operator's Manual
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3.5 Print Mode (Reset):3.5.1 Print:From the display with four dashes, pressing the PRINT key enters thePRINT mode. The display will show "PrLL" or "SEr" based upon whichcable, parallel or serial, is plugged into the unit. With "SEr" in the display,the unit will accept commands from a personal computer or QuestSuite™for Windows software. Serial communications are at a fixed rate of 9600baud. Pressing the enter key initiates printing.3.5.2 Reset:To reset the unit while in the PRINT mode, press the ▼ arrow key. Thedisplay shows "rSt" which allows resetting of the logged memory. Press andhold the enter key for a three second countdown to reset the loggingmemory. This will clear all recorded sessions but will not affect any usersetup options. After a complete reset, the unit automatically returns to thedisplay with four dashes.3.6 Run Mode:While four dashes are shown in the display, the unit automatically enters theRUN mode after thirty seconds or after pressing the enter key. The displaywill show the current gas level along with the RUN and LVL annunciators.In the RUN mode, pressing the arrow keys will display the following items:Level, STEL (Toxic), TWA (Toxic), Peak Level, LO Level (oxygen), PeakSTEL (Toxic), Average Level, Time, Temperature, and the chemicalsymbol corresponding to the installed sensor. Press the enter key to turn onthe backlight without changing the item in the display.Close the run mode by pressing and holding the on/off key while a threesecond close (CLS) countdown is shown in the display. This closes thesession. The next time the unit enters the run mode, it begins a new session.3.7 Zeroing:THE SENSOR'S SENSITIVITY CHANGES OVER TIME AND AFTERUSE, SO TO ADJUST FOR THIS, PERFORM THIS EXERCISE PRIORTO EVERY USE.Note: Fresh, uncontaminated air is necessary for this procedure. (Performaway from heavy traffic, excessive cigarette smoke, etc.) If such anatmosphere is difficult to reach, zero air cylinders are available.Zeroing the sensor adjusts for small baseline drifts which occur over time inelectrochemical sensors.Zero the unit by pressing the zero key from the display with four dashes oras one of the options available through the setup mode. The LVL andZERO annunciators appear along with the current gas level. The gas leveldisplayed should be stable before continuing. Press the enter key to zero theunit. If successfully zeroed, the display will show the current gas level aszero (except in the case of oxygen where the display will *show 20.9). Anunsuccessful zero results in an error message appearing in the display.If the level reading is high prior to attempting to initiate a zero, an erroroccurs. Typical causes include: the presence of gas, the sensor has recentlybeen put in the unit and has not had enough time to settle, or the sensor isold and can no longer be adjusted. Make certain that the environment isfree from toxic gases and the sensor has been under power long enough tohave settled. If the unit still can not successfully perform a zero, replace thesensor.3.8 Calibration:Note: You must zero your unit prior to calibration. Perform this operation ina non-hazardous area. (See Section 3.7 "Zeroing" on page 13).First check the calibration level. While in the SETUP mode, use the arrowkeys to move through the menu until the CAL and LVL annunciatorappears. Check the calibration level shown on the display against the levelprinted on the calibration gas cylinder. If they differ, change the calibrationlevel in the unit to match the calibration gas. (See Section 3.3.2 "CalibrationLevel" on page 11).Snap the unit's calibration cup over the top of the unit so that the cupchamber is over the sensor. See Figure 2. Calibration on page 15.Check the Minimum Flow Rate Table (Section 3.8.1 on page 16) for thespecific gas to be sure the regulator is adequate. Tightly screw the regulatoronto the calibration gas cylinder and check the hose's connection to theregulator to be sure it is secure. Firmly place the end of the hose onto thenozzle of the unit's calibration cup.Turn the knob on the regulator counter-clockwise as far as it will turn torelease the gas. |
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