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REMOTE INTELLIGENT SENSOR - AREA MONITOR
Instruction 2772-0803 Page 2-5
If the ‘O’ ring is left on the purge spigot the
new cassette will not seat fully and faulty tape
handling will occur.
Push the new cassette firmly into position.
When doing so make sure that the tape enters the
open gate and does not catch on the side and break.
If the tape is not tight and in the correct
position to enter the gate, carefully tighten it by
turning the take up spool.
It is not necessary to touch the tape directly.
Touching the tape with bare fingers is undesirable
because of chemicals used to impregnate the tape.
When the cassette is in position, close the tape
gate and press the tape reset button to reset the
tape counter (to 99%) and initiate a new cycle.
NOTE: It is recommended that before
exiting TEST Mode, the System
Parameters are checked as described in
Section 2.8.2. The check takes a few
minutes and ensures that the system is in
optimum adjustment.
Exit the TEST Mode by pressing the red button
inside (on the door) again and close the door.
Tighten the door screws and take care not to over
tighten them. The above procedure is summarized
in the following:
Disable external alarms & warn staff.
Open door and enter TEST Mode.
Remove old cassette, check for retained ‘O’
ring.
Fit new cassette and close gate.
Press tape reset button & observe tape step.
Check system parameters.
Exit TEST Mode and close the door.
2.8.2 CHECK AND ADJUST SYSTEM
PARAMETERS. This procedure can be carried out
if a system fault is reported, as a routine check
after cassette replacement, or at any other time it
is necessary. The full sequence of data displayed in
the TEST Mode depends upon the options fitted to
the particular system. All tests are given below for
completeness.
The parameters that are normally checked at
cassette change are: V system voltage, mA the
current, Light Levels track 1 & 2, and Flow
Rate. The others are set values that do not change
unless the system is switched off.
Entering the TEST Mode. Open the RIS
door, having taken precautions against causing
unnecessary alarms, and enter the TEST Mode by
pressing the red button on the rear of the door.
Each of the TEST Mode displays remains for 3
seconds before stepping to the next parameter.
This cycling of data repeats continuously until
the HOLD/RELEASE key is pressed to hold a
displayed parameter; or the TEST Mode button is
again pressed to exit the mode; or five minutes
passes. After five minutes an automatic return to
the NORMAL mode occurs.
2.8.2.1 V, System Voltage. The first displayed data
is system voltage. This is the regulated voltage
derived from the nominal 12 VDC external supply at
the system interface. The displayed value should be
6.9 ± 0.1V.
If adjustment is required, first press the HOLD/
RELEASE key to hold the display. Adjust by turning
potentiometer VR1 located on the base board near
the system switch SW1 (NOTE: See Supplement A
for older version PCB's). When adjusting, do so
cautiously and allow time for the battery voltage to
settle to the new value. Recheck the voltage 10
minutes after adjustment.
2.8.2.2 mA, ‘Charger Current’. This display shows
the system current taken under the test conditions.
Pump current is not included because the pump is
not running during this part of the test cycle.
The displayed current, in mA, is the total of that
taken by the system, (excluding pump), and the
battery charging current. A ‘normal’ reading is about
60-90 mA. This assumes a well charged battery and
an average specification system.
Note that if the system voltage is lower than
6.9 V, the charge current will be proportionately
higher. A mA reading that is much higher than the
range shown above suggests a discharged or faulty
battery if the system volts are correct.
2.8.2.3 Alarm Set Point. The numerical value in
ppb, or ppm, (system dependent) is shown with the
‘flashing bells’ icon. If the set point has not been
changed, the default value will be active. Default
values are shwon in Table #1.
To change the set point value, ‘hold’ display with
the HOLD/RELEASE key. At this point the least
significant digit will flash and it can be changed as
required by pressing the DIGIT key. Each press steps
one digit more. Press firmly.
When the first digit is selected, step to the next
higher decade by pressing the DECADE key. Again
use the DIGIT key to select the required number, and
so on. On completion, press the HOLD/RELEASE key
to allow the sequence of test data to continue.
2.8.2.4 Alarm Level 1 and 2. When the Relay alarm
option is fitted, there are two Alarm Levels and each
may be user adjusted. Both Alarm Level set ponts
are displayed in sequence when the option is fitted.