Specifications
TM40/40U Rev. (Af), February 2019
55
•
Option 3
: Power, RS-485, 0
–
20mA (Source) and HART protocol, Fault Relay
(N.O.), Alarm Relay (N.O., N.C.).
•
Option 4
: Power, RS-485, Fault Relay (N.C.), Auxiliary Relay (N.O.), Alarm
Relay, (N.O.).
•
Option 5
: Power, RS-485, Fault Relay (N.O.), Auxiliary Relay (N.O.), Alarm
Relay, (N.O.).
A.3.2
Electrical Outputs
A.3.2.1
Dry Contact Relays
Table 20: Contact Ratings
Relay Name Type
Normal Position
Maximum Rating
Alarm
SPDT
N.O., N.C.
2A at 30DVC
Auxiliary
SPST
N.O.
2A at 30VDC
Fault
1 2
SPST
N.C. or N.O.
2A at 30VDC
1
The fault relay (in wiring options 1, 2, and 4) is normally energized closed during normal
operation of the detector. The relay is de-energized open in a fault condition or low voltage
situation.
2
In wiring options 3 and 5 the relay is normally energized open during normal operation of the
detector. The relay is de-energized close contact in a fault condition or low voltage situation.
A.3.2.2
0
–20mA Current Output
The 0
–
20mA can be Sink or Source according to the wiring option source (see
General Instructions for Electrical Wiring
on page 61). The maximum permitted
load resistance is 600Ω
.
Table 21: 20mA Current Output
State
Output
Fault
0 +1mA
BIT fault
2mA±10%
Normal
4mA±10%
Warning
16mA±5%
Alarm
20mA±5%
