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Figure 14 - Magnetic Reed Switch
Activation
In order to enter the main menu of the detector place the curved side of
the magnet on the side of the enclosure at the 10 o’clock position (see
Figure 15) where marked to actuate the magnetic reed switch or press the
Cal/Reset switch. Release the magnetic reed switch or Cal/Reset switch
after the timer has finished counting down from 10 to 0. In the main
menu, the options are displayed and prompted for selection by
displaying “YES?”. Momentarily activate the magnetic reed switch or
Cal/Reset switch when the desired option is prompted for selection. If
the magnetic reed switch or Cal/Reset switch is not activated the Toxic
Detector will scroll to the next option. When a selection has been made
the selection is acknowledged with a flashing “YES”. If none of the
three options are selected, the Toxic Detector returns to the normal
operation mode.
Summary of Main Menu
Enter Main Menu: 10 second timer count down
First Option: Calibrate Sensor, followed by the “YES?” prompt for selection
Second Option: Set Relay Option, followed by the “YES?” prompt for selection
Third Option: Review Settings, followed by the “YES?” prompt for selection
Exit: Return to normal (if no option is selected)
Enter the main menu and activate the magnetic reed switch/CAL/RESET button when prompted for
“Set Relay Options” with YES?. The selection is acknowledged with a fashing “YES”. The output current
will drop to 3.0mA and the micro-processor begins the relay setting procedure. Low alarm level, coil
energization and latching options are set for each relay in sequence.
Step 1. The low alarm level is set first. “Set Low” is scrolled across the screen followed by the alarm level
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setting which increases by increments of 5 (.5 % for the ST1400 O sensor) every 2 seconds. Actuate the
magnetic reed switch/CAL/RESET button when the desired level is displayed. The selection is acknowledged
by flashing the selected level on the alphanumeric display. The range for the low alarm is 5 to 100 (17 - 20.5%
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for the ST1400 O sensor). The value increases in increment of 5 (.5% for the ST1400 O sensor) from 5 (17%
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for the ST1400 O sensor) through to 100 (20.5% for the ST1400 O sensor) until an alarm level is selected or
a 5 minute timer expires in which case the unit returns to normal operation.
Step 2. The coil condition is set under NORMAL status (no alarm present). “Coil Status” is scrolled across
the alphanumeric display. The display then alternates between “Energized” and “De-Energized”, each time
prompting the user with “YES?” for selection. Activate the magnetic reed switch/CAL/RESET button when
the desired action is prompted. The selection is acknowledged by flashing “YES”.
Step 3. The relay latching action is set for ALARM status. “Latch Status” is scrolled on the alphanumeric
display. The display then alternates between “Latching” and “Non-Latching”, each time prompting the user
with “YES?” for selection. Activate the magnetic reed switch/CAL/RESET button when the desired action is
prompted. The selection is acknowledged by flashing “YES”. The alphanumeric display alternates between