REMOTE INTELLIGENT SENSOR - AREA MONITOR
Alarm Level 1 is displayed first and is identified by the number 1 which is shown in addition to the numerical set point value. Similarly, the Alarm level 2 set point which follows, is identified by a 2.
IMPORTANT: Be aware that if the RIS is switched off at SW1, the alarm set point(s) will be return to their default at system switch on. It will therefore be necessary to reestablish set points if they differ from the default values.
2.8.2.5Gas Curve. The gas curve for the system is displayed as a number. Systems are fitted with an alpha numeric display and the active gas curve shown directly (e.g., MDI or TDI etc.). Most systems have only one gas curve programmed in the soft- ware and that curve is permanently active.
2.8.2.6Multi Gas Curve Systems. In special ‘multicurve’ systems, a curve can be selected by:
1.Pressing TEST switch to enter the TEST Mode.
2.Wait until the display scrolls to the gas curve.
3.Press HOLD key to freeze the display.
4.Press DIGIT key to select the required curve.
5.Exit the test mode.
NOTE: The ‘default’ curve is MDI and is automatically selected at system power up.
2.8.2.7Light Levels Track 1 & 2. The next display in sequence, is track 1 light level value. This is a numerical value between, approximately, 200 and 254. Also displayed is a separate 1 (for track one). This is followed by the next display with a similar reading and a 2 (for track two).
The ‘correct’ value for both light levels is 220. However, variations occur normally because of small changes in the reflective property of the tape along its length. These variations do not normally exceed ±2 or 3. If the light level reading is 220 ±2 or 3, do not adjust. If it is approaching 200, or more than 235 it should it be reset to 220.
NOTE: The light level may vary slightly tape to tape. It is essential that checking and adjustment is only made with a tape in the gate and the gate closed. See Section
4.4for detailed instructions on adjustment.
2.8.2.8Flow Rate. While the light level test cycles are active, the pump is running and ‘sample Flow Rate’ can be checked. This is done by
Be aware that each system has its particular Flow Rate as shown in Table #1. After track 1 flow has been read, press the HOLD/RELEASE key to ‘release’ the display. Allow it to step to track 2 and press the key again to ‘hold’ that reading.
Flow to both tracks is supplied by one pump and switched to the active channel by solenoid valves. The flow measured at each track should therefore be similar. Adjustment to the pump flow is made with the potentiometer located on the main board as shown in Figure
2.8.2.9Date & Time. If the Optional Printer card is installed, the data displayed in the Test sequence automatically includes the date and time. The date and time are reset to zero, with any stored data point information, when the system is switched off at SW1. It is necessary to set the date & time when the system is installed, and if it is switched off subsequently.
'HOLD' Setting Date & Time. To set the date and time, ‘hold’ the display and use the digit and decade keys to select the required values. The decade that flashes after the display is ‘held’ is adjusted first in each case.
If the number required is stepped past, keep going until the desired number comes round again. Note that the date & time is not lost if the input supply fails, providing the
2.8.2.10Interruption of TEST Mode Cycle. If
5 minutes have elapsed since entering the Test Mode, the display will revert to “normal”. To complete the adjustments, press TEST Mode switch again to reenter the mode and carry on.
2.8.2.11Completion of Checks. Exit the TEST MODE by pressing the red TEST BUTTON again on the rear of the door.
NOTE: It is occasionally possible to initiate a display that contains both ‘normal’ and ‘test’ data simultaneously. If this occurs when exiting the TEST Mode, press red TEST MODE button to reenter the mode and then again to exit it cleanly.
When installing a new tape, press the red TAPE RESET button on the left of the tape gate to reset the system and the tape counter.
Close the door and tighten the securing screw fasteners. The display should now show: SYSTEM OK and a zero NUMERICAL ppm/ppb value (assuming monitored atmosphere is zero) alternat- ing with 99% which indicates the cassette life available. There should be no fault icons shown.
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