Groth 3011L - Manual (Page 7)

6
MODEL SELECTION AND PRESSURE SETTING
Model selection is based on a combination of set pressure and supply pressure as shown in Table 2.
The regulator may be set at the factory or on the tank or vessel when initially introducing blanketing gas. A pressure gauge
(or manometer) is required to indicate the tank pressure.
WARNING: When adjusting the regulator on the tank, always be sure that the sense line is open and unobstructed.
Monitor the tank pressure accurately.
Set pressure is adjusted by removing the spring chamber cap [3] and rotating the adjustment screw [11]. Back-off the hex jam nut
[27] and turn the screw clockwise (tighten) to increase set pressure. The model 3011L, 3011H & 3011HP regulators cover a range
of set pressures from 0.5" WC to 1.99 psig The model 3041L, 3041H & 3041HP regulators cover a range of set pressures from -
0.5" WC to - 1.99 psig Table 2 shows standard set pressure ranges.
The set pressure range with the original spring is stamped on the valve nameplate. The regulator will not function properly if the
setting is outside this range. If higher or lower settings are required, the necessary components can be obtained from Groth
Corporation. They must be installed according to instructions in the maintenance section of this manual.
TABLE 2 – SET PRESSURE RANGES
1/2" 3011 SERIES 1/2" 3041 SERIES
Supply Pressure psig / (barg) Supply Pressure psig / (barg)
Pressure
Setting
INWC
(mbarg)
5 to 50
(0.34 to
3.4)
>50 to
100
(3.4 to
6.9)
>100 to
150
(6.9 to
10.3)
>150 to
200
(10.3 to
13.8)
Vacuum
Setting
INWC
(mbarg)
5 to 50
(0.34 to
3.4)
>50 to
100
(3.4 to
6.9)
>100
to 150
(6.9 to
10.3)
>150 to
200
(10.3 to
13.8)
0.5 to <1.0
(1.2 to 2.5)
3011L
0.5 to <1.0
(1.2 to 2.5)
3041L
1.0 to <1.5
(2.5 to 3.7)
1.0 to <1.5
(2.5 to 3.7)
1.5 to <2.0
(3.7 to 5.0)
3011H
1.5 to <2.0
(3.7 to 5.0)
3041H
2.0 to 6.5
(5.0 to 16)
2.0 to 6.5
(5.0 to 16)
1" 3011 SERIES 1" 3041 SERIES
Supply Pressure psig / (barg) Supply Pressure psig / (barg)
Pressure
Setting
INWC
(mbarg)
5 to 50
(0.34 to
3.4)
>50 to
100
(3.4 to
6.9)
>100 to
150
(6.9 to
10.3)
>150 to
200
(10.3 to
13.8)
Vacuum
Setting
INWC
(mbarg)
5 to 50
(0.34 to
3.4)
>50 to
100
(3.4 to
6.9)
>100
to 150
(6.9 to
10.3)
>150 to
200
(10.3 to
13.8)
0.5 to <1.0
(1.2 to 2.5)
0.5 to <1.0
(1.2 to 2.5)
1.0 to <1.5
(2.5 to 3.7)
3011L
1.0 to <1.5
(2.5 to 3.7)
3041L
1.5 to <2.0
(3.7 to 5.0) 3011H
1.5 to <2.0
(3.7 to 5.0) 3041H
2.0 to <6.5
(5.0 to 16)
2.0 to <6.5
(5.0 to 16)
6.5 to <2
psig
(16 to 140)
3011HP
6.5 to <2
psig
(16 to 140)
3041HP