Types 1098-EGR and 1098H-EGR
12
Table 6.
Auxiliary Pilot Selection (Fast Stroke Dual Pilot)
Table 7.
Working Monitor Performance
wide-Open Monitor (Figure 7)
Either the upstream or downstream regulator can be
the monitor regulator. During normal operation, the
monitoring regulator is standing wide open with the
reduction to distribution pressure being taken across
the working regulator. Only in case of open failure of
the working regulator does the wide open monitoring
regulator take control at its slightly higher setting.
Note that if using a downstream monitor setup, the
upstream worker regulator actuator must be rated to the
application’s full inlet pressure or be protected from it in
case it fails wide-open.
Regardless of which regulator is used as the monitor, it
should be equipped with a pilot supply regulator set to
5 psig / 0.34 bar plus the monitor minimum differential
presure above the working regulator pressure setting.
Since the pilot on the monitoring regulator is wide open
during normal operation, the pilot supply regulator
prevents differential check valve chatter on the
monitoring regulator pilot.
Adjustment Recommendations for
Monitor Applications
Low amplitude/high frequency monitor trim oscillations
can occur if the monitor regulator pressure setting is
adjusted too closely to the working regulator pressure
setting and/or if the monitor pilot supply regulator
pressure setting is adjusted too closely to the monitor
regulator pressure setting. The monitor pressure
setting should be adjusted so it is at minimum two
times the pilot proportional band pressure above
the working regulator pressure setting. These
adjustments must be made such that other governing
pressure limits, such as casing ratings, pilot maximum
differential pressures or regulatory limits, are
not exceeded.
Installation
1. For both the wide-open monitoring regulator
and the working regulator, perform the Standard
Single-Pilot Regulator Installation section through
step 7.
SIzE
CONSTRuCTION
ORIFICE
SPRINg RANgE
SPRINg
NuMBER
SPRINg
COlOR
MINIMuM PRESSuRE
AT wHICH AuxIlIARy
PIlOT CAN BE SET
In.
mm
psi
bar
3/4
NPT
Type Y600AM
1/4
6.4
4 to 8 in. w.c.
10 to 20 mbar
1B653827052
Red
1 in. w.c. / 2 mbar
Under working
pilot setpoint
7 to 16 in. w.c.
17 to 40 mbar
1B653927022
Unpainted
15 in. w.c. to 1.2 psi
37 mbar to 0.08 bar
1B537027052
Yellow
1.2 to 2.5
0.08 to 0.17
1B537127022
Green
6 in. w.c. / 14 mbar
Under working
pilot setpoint
2.5 to 4.5
0.17 to 0.31
1B537227022
Light Blue
4.5 to 7
0.31 to 0.48
1B537327052
Black
Type 627M
1/2
13
5 to 10
0.34 to 0.69
10B3076X012
Yellow
8 in. w.c. / 21 mbar
Under working
pilot setpoint
MONITORINg PIlOT INFORMATION
MINIMuM PRESSuRE AT wHICH
wORKINg MONITOR REgulATOR
CAN BE SET
Construction
Spring Range
Spring Part Number
psig
bar
Type 161AYW pilot and 150 psig /
10.3 bar maximum allowable pilot
inlet pressure
3 to 12 in. w.c.
11 to 25 in. w.c.
7 to 30 mbar
27 to 62 mbar
1B653927022
1B537027052
3 in. w.c. / 7 mbar over
normal distribution pressure
25 in. w.c. to 2.5 psi
2.5 to 4.5 psi
4.5 to 7 psi
62 mbar to 0.17 bar
0.17 to 0.31
0.31 to 0.4
1B537127022
1B537227022
1B537327052
14 in. w.c. / 34 mbar over
normal distribution pressure
Type 627-109 pilot and 1000 psi /
69 bar maximum allowable pilot
inlet pressure
5 to 20
15 to 40
35 to 80
0.34 to 1.4
1.0 to 2.8
2.4 to 5.5
10B3076X012
10B3077X012
10B3078X012
3.0 psig / 0.21 bar over
normal distribution pressure
70 to 150
130 to 200
4.8 to 10.3
9.0 to 13.8
10B3079X012
5.0 psig / 0.34 bar over
normal distribution pressure
