Product Data

L404A,B PRESSURETROL® CONTROLLERS
Table 1. Models Available .
Model
Switching
Action on
Pressure
Rise to
Setpoint
Operating Ranges
a
Midscale Subtractive Differential
a
(Adjustable)
Maximum Surge
Pressure
psi kg/cm
2
kPa psi kg/cm
2
kPa psi kg/cm
2
kPa
L404A spst, breaks
circuit
0.5 to 5 0.035 to
0.35
3.4 to 35 Fixed (0.25 psi maximum @ 1.5 psi) 8.5 0.6 59
2 to 15
b
.14 to 1.0 14 to 103 2 to 6 0.14 to 0.41 14 to 4 50 3.5 345
5 to 50 .35 to 3.5 34 to 345 4 to 12 .28 to 0.82 127 to 83 85 6.0 586
10 to 150
.66 to 10.6 69 to 1034 8 to 16 0.56 to 1.10 55 to 110 225 15.8 1550
20 to 300
c
1.4 to 21.0 138 to 2068 15 to 40 1.04 to 2.76 103 to 276 500 35.2 3445
L404B
d
spst, makes
circuit
2 to 15
b
.14 to 1.1 14 to 103 2 to 6 0.14 to 0.41 14 to 41 50 3.5 345
5 to 50 .35 to 3.5 24 to 345 4 to 12 0.28 to 0.82 27 to 83 85 6.0 586
10 to 150
.66 to 10.6 69 to 1034 8 to 16 0.56 to 1.10 55 to 110 225 15.8 1550
20 to 300
c
1.4 to 21.0 138 to 2068 15 to 40 1.04 to 2.76 103 to 276 500 35.2 3445
a
Scaleplates are marked in both psi and kg/cm
2
.
b
L404A,B models are available with 1 to 6 psi midscale subtractive differential in 2 to 15 psi models.
c
Brass bellows replace stainless steel diaphragm. Not suitable for use with ammonia, oxygen, or other corrosive materials.
d
Also recommended for supervision of atomizing medium pressure (air or steam) in an oil burner system.
Table 2. Switch Contact Rating (in Amperes at 50/60 Hz).
Model Load 120 vac 240 Vac 120 Vdc 240 Vdc
L404A Full Load
Locked Rotor
Noninductive
8.0
48.0
10.0
5.1
30.5
5.0
2.4
24.0
5.0
1.2
12.0
2.0
Table 3. Conversion Table (psi to kg/cm
2
and kPa).
Operating Range Subtractive Differential
Equivalent Equivalent
Scale-Plate (psi) kg/cm
2
kPa Scale-Plate (psi) kg/cm2 kPa
0 to 15 0 to 10 0 to 103 – – –
2 to 15 0.14 to 1.0 14 to 103 1 to 6
2 to 6
0.77 to 4
0.14 to 0.4
7 to 41
14 to 41
5 to 50 0.3 to 3.5 35 to 345 4 to 12
5 to 14
0.3 to 0.8
0.4 to 1.0
28 to 83
41 to 97
5 to 150 0.3 to 10.3 34 to 1034 – – –
10 to 150 0.7 to 10.3 69 to 1034 8 to 16
10 to 22
0.6 to 1.1
0.7 to 1.5
55 to 110
69 to 152
20 to 360 1.4 to 20.7 138 to 2068 15 to 40 1.0 to 2.8 103 to 276
138 to 345
MERCURY NOTICE
If this control is replacing a control that contains
mercury in a sealed tube, do not place your old control
in the trash. Dispose of properly. This control also
contains mercury in a sealed tube. It must also be
disposed of properly when it is replaced.
Contact your local waste management authority for
instructions regarding recycling and the proper
disposal of an old control.
3 95C-10187B–1