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Pressure switches (DG..t, DG..Ft, DG..st):
Adjust-
ing
type
range
1)
"WC
(mbar)
0.2–2.4
DG 6T
(0.5–6)
0.4–4
DG 10T
(1–10)
1–20
DG 50T
(2.5–50)
12–60
DG 150T
(30–150)
40–200
DG 500T
(100–
500)
Pressure switches with manual reset (DG..Ht,
DG..nt):
Adjust-
ing
type
range
1)
"WC
(mbar)
0.4–4
DG 10T
(1–10)
1–20
DG 50T
(2.5–50)
12–60
DG 150T
(30–150)
40–200
DG 500T
(100–
500)
1) Adjusting tolerance = ± 15% of the scale value.
2) Mean switching differential at min. and max. setting
"WC (mbar).
3) Connect the venting line to port 4. Connections, see
page 2 (3 Installation).
4) Difference between switching pressure and possible
reset.
Mean
switch-
ing
Max. inlet
differ-
pressure
ential
2)
psi (mbar)
"WC
(mbar)
With
venting
venting
line
3)
0.08–
8.5
0.12
(600)
(0.2–0.3)
0.1–0.16
8.5
(0.25–
(600)
0.4)
0.32–0.6
8.5
(0.8–1.5)
(600)
1.2–2
8.5
(3–5)
(600)
3.2–6.8
8.5
(8–17)
(600)
Reset
pres-
Max. inlet
sure
pressure
4)
"WC
psi (mbar)
(mbar)
With
venting
venting
line
3)
0.16–
8.5
0.4
(600)
(480)
(0.4–1)
0.4–0.8
8.5
(1–2)
(600)
(480)
2–6
8.5
(5–15)
(600)
(480)
6–10
8.5
(15–25)
(600)
(480)
6 PRessURe sWItCHes WItH MAn-
UAL Reset
➔ DG..NT locks off if the pressure drops to the value
set using the hand wheel.
➔ DG..HT locks off if the pressure rises to the value
set using the hand wheel.
1 Reset the pressure switch using the manual reset.
no
➔ Requirement for reset:
DG..NT: the pressure must have risen at least to the
line
set switching point plus the pressure differential be-
2.4
tween the switching pressure and possible lock-off.
(165)
DG..HT: the pressure must have dropped at least
to the set switching point minus the pressure differ-
7
ential between the switching pressure and possible
(480)
lock-off.
➔ For details of the pressure differential between the
7
(480)
switching pressure and possible reset, see table
7
on page 3 (5 Adjustment).
(480)
7 tIGHtness test
7
(480)
1 Shut off the downstream gas pipeline close to the
valve.
2 Open the valve and the gas supply.
➔ Check all used ports for tightness.
➔ N
= 13 psi (max. 29 psi) <15 minutes
2
no
N
line
3
7
8 MAIntenAnCe CYCLes
Check for external tightness at least once per annum,
7
at least twice per annum for operation with biogas.
7
9 ACCessoRIes
7
9.1 Blue pilot lamp for 110/120 V AC
110/120 V AC, I = 1.2 mA, Order No.: 74916121.
1
4
EN-4
2
2
4
3
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