NORMAL OPERATION
Touchpoint Pro
Pt. No. 2400M2566_1_EN
40
Operating Manual
The STEL function becomes active and starts monitoring the average gas level when the STEL alarm has been enabled and
the input module returns to its normal state. If the STEL alarm had already been enabled prior to TPPR being powered
down, then the STEL function becomes active when TPPR is powered up.
6.2.2
Assigning the STEL Alarm to an Output Relay
To assign an output relay to an input channel’s STEL alarm, navigate to the cause and effect (C&E) matrix for the required
relay and select Alarm 1 (AL1) for the input channel as shown in the figure below.
Threshold Alarm 1 and STEL share the output relay. If the channel is programmed for threshold levels then AL1 selection is
used for the first threshold alarm and STEL may not be assigned to a relay. Similarly, if the channel is programmed for
STEL, AL1 is reserved for STEL and may not be assigned to a threshold alarm.
This relay will also be assigned to the required inputs for Threshold alarm 1.
ID/Location
AL1
AL2
AL3
FLT
INH
WRN
Select All
133 – 1 mA Ch1
6.3
Rate Alarm
Rate Alarms can be setup to trigger when a gas concentration changes quickly. An alarm may be triggered by a rising or
falling gas level even though the gas has not reached a threshold level. The extent of change and the time period are
programmable.
6.4
Relay Activated Outputs
TPPR has the ability to automatically operate relay controlled outputs when an alarm is triggered. These outputs are
determined during commissioning and may be used to control any or all of these:
•
Light Stacks and Sirens
•
Automated Emergency Services alerts
•
Actuator controlled vents, valves and switches (i.e. power-breaking, purging, sprinkling or flooding)
•
Exit door release
•
Entry Barrier closing
6.5
Sensor Over Range Operation
TPPR can display a warning if an input signal exceeds the configured gas range. Two signals are provided:
•
Full Scale Exceeded
•
Over Range Warning
The Full Scale Exceeded warning is displayed, if enabled, when the gas reading exceeds the programmed range. The
warning is cleared automatically when the signal returns below 100% of the selected range.
The Over Range Warning is programmable. If enabled, the warning is displayed when the gas reading exceeds the
programmed level (default is 110% of the programmed range). This signal is normally set to latching.
The Over Range Warning has a higher priority than the Full Scale Exceeded warning. If the Over Range Warning is
asserted, the Full Scale Exceeded warning is cleared.
Select AL1 to assign this relay to the selected inputs STEL alarm. Note that this relay will
also be assigned to the selected inputs alarm 1 threshold.
