36 900 Series V5.0: Installation Guide, April 1999
• The 10 Ohm source impedance is an approximate figure only and should be
replaced by the actual impedance, if known.
4. Multiply the total current with the total resistance and subtract the result from the loop
voltage. This gives the minimum voltage that a device in the worst possible position on
the loop can experience.
6.2.1. Standby current
LOOP x
Table 5: Device quiescent current
STANDBY CURRENT
Device Code Quantity Standby Current (A) Total (A)
Ionisation DI950 0.00028
DI970 0.00028
DI990 0.00075
Optical DP951 0.00034
DP971 0.00034
DP991 0.00065
Heat DT952 0.00025
DT953 0.00027
DT972 0.00025
DT992 0.00075
Multi-sensor DP951T 0.0005
DP991T 0.00075
Isolator IU950 0.00012
IU950D 0.000047
DB960 0.000047
DB961 0.000047
MCP DM960 0.00023
DM970 0.00023
DM990 0.00060
Loop powered beam detector FD950 (TX) 0.010
FD950 (RX) 0.006
Zone monitor II955 0.004
II955D 0.004
Loop powered sounder AS950 0.00014
Sounder circuit controller IO956 0.0019
IO956D 0.0019
1-Output IO955 0.0012
IO955D 0.00072
1-Channel I/O IO950 0.0012
IO950D 0.0012
3-Channel I/O IU922 0.0001
Mini switch monitor II950 0.001
Mini switch monitor with INT. II951 0.00025
Switch monitor II952 0.0012
II952D 0.00073
Switch monitor plus II953 0.0012
II953D 0.00073
TOTAL
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