Specifications

20
BAA-3308-900R BAA-3308-550R
Construction:
Body.
Internals, Caps
316 stainless steel
(NACE MR-01-75)
Hardcoated Aluminum
(MIL-A-8625E, Type III, Class1)
Stainless steel Fasteners- Stainless steel
FKM (uorocarbon) O rings Seals- FKM (uorocarbon) O rings
25-130 psi (1.7-8.8 bar)
Pressures:
Working (Controlled)
pressure range-
15-120 psi (1- 8.2 bar)
5 psi (0.3 bar)
Maximum allowable
exhaust backpressure-
5 psi (0.3 bar)
See Charts A & B below Pilot trip/reset- See Charts A & B below
Consult Factory Flow: Consult Factory
Air - 40 to 50 micron ltration
recommended
Media:
Air - 40 to 50 micron ltration
recommended
1/4” NPT
1/8” NPT
Porting:
Valve Ports-
Pilot Ports-
1/4” NPT
1/8” NPT
Panel Mount (1”ø hole) Mounting & Installation: Panel Mount (1”ø hole)
Red (black character “R”)
Green (black character “G”)
Indicator colors:
Trip mode (depressurized)-
Working mode (pressurized)-
Red (black character “R”)
Green (black character “G”)
(Consult factoru for other color availibility)
Pressure Chart “A” (working range): Indicating Relay-Transmitting type
Indicating
Relay Valve
Inlet Pressure
BAA-3308-900R
PSIG — — 25 30 40 50 60 70 80 90 100 110 120 130
BAR — — 1.7 2.0 2.7 3.4 4.1 4.8 5.4 6.1 6.8 7.5 8.2 8.8
BAA-3308-550R
PSIG 15 20 — 30 40 50 60 70 80 90 100 110 120 —
BAR 1.0 1.4 — 2.0 2.7 3.4 4.1 4.8 5.4 6.1 6.8 7.5 8.2 —
Minimum
Reset- Pilot
Pressure
BAA-3308-900R
PSIG — — 25 30 37 45 54 63 72 77 85 92 100 110
BAR — — 1.7 2.0 2.5 3.1 3.7 4.3 4.9 5.2 5.8 6.3 6.8 7.5
BAA-3308-550R
PSIG 15 18 — 24 29 35 40 46 51 57 61 65 74 —
BAR 1.0 1.2 — 1.6 2.0 2.4 2.7 3.1 3.5 3.9 4.2 4.4 5.0 —
Pressure Chart “B” (shut-down range): Indicating Relay-Transmitting type
Indicating
Relay Valve
Inlet Pressure
BAA-3308-900R
PSIG — — 25 30 40 50 60 70 80 90 100 110 120 130
BAR — — 1.7 2.0 2.7 3.4 4.1 4.8 5.4 6.1 6.8 7.5 8.2 8.8
BAA-3308-550R
PSIG 15 20 — 30 40 50 60 70 80 90 100 110 120 —
BAR 1.0 1.4 — 2.0 2.7 3.4 4.1 4.8 5.4 6.1 6.8 7.5 8.2 —
Minimum Trip-
Pilot Pressure
BAA-3308-900R
PSIG — — 10 16 22 28 35 42 50 57 63 70 77 85
BAR — — 0.7 1.1 1.5 1.9 2.4 2.9 3.4 3.9 4.3 4.8 5.2 5.8
BAA-3308-550R
PSIG 1 4 — 10 15 21 26 32 37 44 47 53 59 —
BAR 0.07 0.3 — 0.7 1.0 1.4 1.8 2.2 2.5 3.0 3.2 3.6 4.0 —
DIRECTION OF
AC TUATION
(INDICATOR)
GREEN RED
PILOT EXHAUST
(SIGNAL)
Indicating Relays-Transmitting type
Main Supply Relay Valve
e.g. BAA-3309-900W See page 18.
to main
system
Sensor
Sensor
Sensor
Ø
.27
6.9
(3 MOUNTING
HOLES)
Ø
1.0
25.4
MIN PANEL HOLE
WRENCH FLAT
1.37
34.8
.50
12.7
.56
14.2
1.0
25.4
.50
12.7
MAX PANEL
THICKNESS
2.38
60.5
⅛” NPT PILOT EXHAUST PORT
¼” NPT (3 PORT)
2.0
50.8
1.38
35.1
6.21
157.7
1.08
27.4
Indicating Relay – Pilot Monitoring Valves
Series
B900 & B550 VALVES
STAINLESS STEEL
HARDCOATED ALUMINUM
CONSTRUCTION
Indicating Relay valves are used to monitor the pilot actuators
of the Main Supply Relay valves listed on pages 16-19. The
Indicating Relays have two functions. First, to indicate visually
on a panel that a circuit malfunction has occurred and sec-
ondly, to quickly cause operating pressure to exhaust from the
system through the Main Supply Relay valve, allowing a valve
operator or pneumatic system to shut-down. When placed in
series with other Indicating Relays, only the relay indicator of
the relay controlling the circuit for which a malfunction is
sensed will show red (R).
Three types of Indicating Relays are available:
First Out Indicator-Transmitting type (page 20)
First Out Indicator-Receiving type (page 21)
First Out Indicator-Bypass type (page 22)
Operation Mode A
Flow path is open between the Relay inlet and
“CYL” port whenever both the Relay inlet and
pilot pressure are within the working pres-
sure range in Chart A. In this condition the
Relay indicator is green (G). If the Relay inlet
pressure is lost while in this mode, the Relay
ow position and
indicator color will remain
unchanged.
Operation Mode B
Flow path is open between the Relay “CYL”
port and exhaust port whenever the Relay pilot
chamber backpressure does not exceed the
specications in Chart B. In this condition the
Relay indicator is red (R). The relay will auto-
matically reset to operation mode A when both
the Relay inlet and pilot pressure return to the
working range, as indicated in Chart A
FIRST OUT INDICATOR/INDICATING RELAY-TRANSMITTING TYPE
Transmitting Relay Circuit
(system in mode A - working range)
Dimensions are approximate.
Consult factory for actual
dimensions of specic valves.