11
PRS-UM-BTN-EN-Rev02-02.2019
Alarm1, Alarm2 and Fault. Relays are not energised and only works as NO (Normally Open)
status. It is not possible to adjust relay activation method. Alarm1 relay will be activated when
alarm1 threshold level exceeded. If measurement level inceases Alarm2 relay activated
together with Alarm 1. Fault relay will be activated only on fault conditions. Alarm levels are
adjustable to predefined levels. Switches 6 and 7 should be used to change alarm levels.
Diagram 7: BTN Series detector alarm level adjustment switches
Alarm levels and related switch positions are given in table-3:
Switch 6
Switch 7
Alarm1
Alarm2
OFF
OFF
10
15
OFF
ON
10
20
ON
OFF
30
40
ON
ON
40
60
Table 1: BTN Series detector alarm levels
Oxygen Detectors:
For oxygen detectors the output values and meanings are different as oxygen is naturally
available in atmosphere. Alarm 1 is used to raise low level alarm and Alarm2 is used to raise
high level alarm for Oxygen. Alarm levels are also different as given in below table: Alarm
levels and related switch positions are given below:
Switch 6
Switch 7
Alarm1
Alarm2
OFF
OFF
18
23
ON
OFF
19
22
OFF
ON
18
22
ON
ON
19
23
Table 2: BTN Series Oxygen detector alarm level (% Volume) switch positions
Alarm level adjustment
switches
