VACUUM SWITCHES
MN / MA
INSTALLATION DRAWING
APPROX. DIMENSIONS IN
mm
inches
Set Screw Cover
2 nos. Mounting Holes, 5.5 dia.
Ø5 Hole (to be Always Open to Atmosphere)
34.5
25
0.98
123
4.84
85
3.35
55
2.17
Terminal Strip
3/8” Cable Entry
Vacuum Port 1/4” BSP Female
Differential Screw
VACUUM
SWITCH
(for MA series only)
1.36
PRESSURE CAPSULE DETAILS
No. Description
1. Disc
2. Diaphragm
3. Plunger (SS 316)
4. Junction Plate
5. Sealing 'O' ring (Teflon
6. Sealing diaphragms (Teflon
®
)
®
)
1
2
3
4
5
6
Note : wetted parts are mentioned in italics.
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268
Bulletin No. KA121024
VACUUM SWITCHES
MN / MA
GENERAL INFORMATION :
MN / MA series vacuum switches are housed in pressure
die cast aluminium powder coated enclosure and are
recommended for panel mounting or outdoor service
based on the type of enclosure opted for. The repeat
accuracy is better than 2% FSR. A 3/8” cable entry is
provided for cables and a terminal strip suitable for wired
ends is provided inside the enclosure. Pressure port is
1/4” BSPF standard.
±
FEATURES :
!
Compact
!
Separate chamber for working parts
!
Wide band adjustable differential in MA series.
!
Choice of wetted parts to suit working media
!
Electrical rating : 5A, 250VAC; 0.2A, 250 VDC
!
Pressure port : 1/4” BSPF
Some Applications : Used in grinding machines for
holding jobs, vacuum systems, blowers, pumps, etc.
MN
Range code
V00
100
(3.94)
100 - 500
(3.94 - 19.69)
Maximum Working
Pressure bar (psi)
12
(174.05)
MA
RANGE SELECTION TABLE
* Minimum differential increases with setpoint (Graphs available on request)
Typical values achieved at sea level, total vacuum that can be achieved varies mainly with altitude.†
760 - 100
(29.92 - 3.94)
†
Range vacuum (falling)
mm Hg (”Hg)
*Approximate Maximum
Differential (Fixed)
mm Hg (”Hg)
*Adjustable Differential
mm Hg (” Hg)
Eg. A fixed differential vacuum switch, high range from 760 mm Hg vac. To 100 mm Hg vac. in uncalibrated style, with brass
pressure housing, a Teflon diaphragm & a standard enclosure shall be specified by
Please specify full model number to avoid ambiguty. If only the first two groups are specified while ordering, uncalibrated switches with
standard wetted parts and enclosures will be supplied.
HOW TO ORDER MN / MA SERIES VACUUM SWITCHES
MN -
Fixed differential
Vacuum Switch
MA -
Adjustable diff.
Vacuum Switch
V00 - High range
vacuum Switch
C - Calibrated
U - Uncalibrated
A - Aluminium
B - Brass
S -SS 316
0 - Neoprene
1 - Teflon
0 - Standard (IP54)
1 - IP65 as per
IS 2147
Group 2
Range Code
Group 3
Range Scale
Group 4
Disc
Group 5
Diaphragm
Group 6
Enclosure
Group 1
Model
Group 1 Group 2
Group 3 Group 4 Group 5 Group 6
MN
V00
U
B
1
0
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Bulletin No. KA121024