IOM FTI Iss.1
October 2018
Page 2 of 8
1
Specification & Operation
1.1
Introduction
The SprinklerSense FTI is designed specifically for use with Influx SPDB30 and SPDB90 type LPCB approved
flow switches. The unit is permanently wall mounted at an easily accessible height to provide a user interface to
access the self-test features of the flow switch and provide repeat relay contacts for both the Flow and Error
outputs.
Three LEDs are provided to indicate the current status of the flow switch, with a selectable buzzer which will
sound if an error or flow alarm is initiated. The integral display can then be used to show which error type has
been detected.
If there are no errors detected, Fire Safety personnel can use the key switch to start a flow switch check which
will test the function of the flow switch electronics and activate the Flow output. The function of the output
relay, site wiring, panel input and other devices that may be connected to the output can then be checked.
A PC app. can be used which allows further interrogation of the flow switch via a USB connection.
1.2
Construction & Specification
Housing:
2 Gang Faceplate (surface mounting rear box provided)
Operating Temperature Range: 2 to 68
C
Supply Voltage:
9 to 30V D.C.
Quiescent Current (maximum)
170mA @ 12V, 100mA @ 24V (includes flow switch and FTI)
Quiescent Current (average)
90mA @ 12V, 65mA @ 24V (includes flow switch and FTI)
Flow Switch Repeat Output:
1x SPCO Relay, 24V D.C., 500mA
Error Repeat Output:
1x SPCO Relay, 24V D.C., 500mA
1.3
Operation
The FTI is connected to the SprinklerSense flow switch via a serial communications link (wired). It continuously
requests status information from the sensor and reacts accordingly. In normal use, without flow or errors, the
green LED will flash slowly to indicate that the flow switch is functioning OK. If a sprinkler flow rate is
detected the red LED will flash quickly and if enabled the buzzer will sound. If an error is detected the yellow
LED will flash at a medium rate and the buzzer will sound (if enabled). For flow and error states, the appropriate
output relay will also switch.
System Errors
While the yellow LED is flashing, personnel with access to the key for the switch can if required, turn the key to
the TEST position which will allow the error type to be displayed. This action will also silence the buzzer for a
period of 2 hours. If the key is left in this position, the unit will timeout. The key will then have to be turned
back to ON before the display can be reactivated.
An error condition will be activated in the event of one of the following:
1)
A fault is detected with one or more of the sensor probes.
2)
A calibration error is detected outside of factory tolerances.
3)
The SPDB30/90 flow switch is not responding.
Note: For Power supply failure detection the Error output from the SPDB30/90 should be used.
The following conditions will also cause an error condition if enabled:
1)
The sensor cannot detect water in the pipe, Dry Pipe (enabled by default).
2)
A temperature of less than 2°C is detected in the pipe, Freeze Risk (enabled by default).
3)
A small but continuous flow is detected, Leak Flow (dis-enabled by default).
Note: Settings are stored in the flow switch.
