I
NSTALLATION
748213-P Rosemount Analytical June 1997
2-13
Model 755R Oxygen Analyzer
When input signal moves upscale through this point, the
coil of ALARM 1 relay (K1) is energized, providing
continuity between the common and normally-closed
contacts of the relay.
ALARM 1 Setpoint
When input signal moves downscale through this point, the
coil of ALARM 1 relay (K1) is de-energized, providing
continuity between the common and normally-open
contacts of the relay.
ALARM 2 Setpoint
When input signal moves upscale through this point, the
coil of ALARM 2 relay (K2) is de-energized, providing
continuity between the common and normally-open
contacts of the relay.
When input signal moves upscale through this point, the
coil of ALARM 2 relay (K2) is energized, providing
continuity between the common and normally-closed
contacts of the relay.
A. Typical ALARM 1 Setting
DEADBAND SET FOR
20% OF FULLSCALE
DEADBAND SET FOR
10% OF FULLSCALE
B. Typical ALARM 2 Setting
INPUT SIGNAL
Percent of Fullscale
INPUT SIGNAL
Percent of Fullscale
40
30
20
55
50
45
F
IGURE
2-6. T
YPICAL
A
LARM
S
ETTINGS
F
IGURE
2-7. A
LARM
R
ELAY
A
SSEMBLY
S
CHEMATIC
D
IAGRAM
J5
1
2
4
6
+15V
-15V
Alarm
No. 1
Command
Alarm
No. 2
Command
CR1
K1
14
13
12
8
9
5
1
TB4
NO
COM
NC
Alarm
No. 1
Reset
CR2
K2
14
13
12
8
9
5
1
NO
COM
NC
Alarm
No. 2
Reset
2. CR! AND CR2 ARE ANY 600V, 1 AMP DIODE.
1. RELAYS SHOWN IN ENERGIZED POSITION.
NOTES:
