Spectrex 20/20U (UB) - UV Flame Detector - Manual (Page 18)

Spectrex Inc. - SharpEye™ UV Flame Detector Manual – TM 20/20UB Rev. E, August 2004
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4.3 Mode Selection
The detector has 2 DIPswitches, which enables the user to adapt the detector’s
operation to specific applications:
• Function switch (SW1)
• Alarm Delay Switch (SW2)
4.3.1 Function switch (SW1)
The user can select the desired mode of operation by means of this switch
according to Table 4.
Table 4. Function Switch SW1
SW ON Position OFF Position
1 Alarm Signal Latching enabled. Reset
of the Alarm signal is performed by
momentary disconnection of power
supply or manual BIT activation. Alarm Signal Latching disabled
(default).
2 Automatic & Manual BIT can be
performed (default). Only Manual BIT can be
performed.
3 Not Used
4 Accessory Relay used by the Warning
level. Accessory Relay used in parallel
to the Alarm Relay (default).
5 Not Used
6 Following a successful Manual BIT
sequence:
Alarm Relay is activated and the
4-20mA output turns to 20mA for
approximately 3 seconds (default). Following a successful Manual
BIT sequence
(1),(2) :
Alarm Relay is not activated
7 Following a successful Manual BIT
sequence
(2) :
Accessory Relay is activated and the
4-20mA output turns to 16mA for
approximately 3 seconds
(3) (default).
Following a successful Manual
BIT sequence
(2) :
Accessory Relay is not activated.
8 Accessory Relay used as EOL relay. Accessory Relay function in
accordance with the position of
SW1-4 (default).
Notes :
1 The BIT sequence may last up to 7 seconds. Verify that all eight (8) switches
are in the appropriate setting (ON/OFF), to achieve the required functional
mode of operation.
2 SW1-2, SW1-6, SW1-7 are function only for model 20/20UB. Model 20/20U
does include BIT.
3 If both SW1-6 and SW1-7 are at on position the 4-20mA output is 20mA
(Alarm Level) after successful manual BIT.