PRESSURE SWITCHES

PRESSURE DIFFERENCE SWITCHES

VACUUM SWITCHES
From 1.5 mbar to 600 bar

MT High Range
Pressure Switches
CATALOGUE

Certificate No.: FM72815

Kaustubha Udyog AN ISO9001:2008 COMPANY
S. No. 36/1/1, Sinhgad Road, Vadgaon Khurd,
Near Lokmat Press, Pune 411 041 INDIA
Tel. : +91-(0) 20-24393577 / 24393877
Telefax : +91-(0) 20-24393577 / 25460486
Email : pressure@vsnl.com
Website : http://www.orion-instruments.com
BULLETIN NO. : KA170725
MT HIGH PRESSURE RANGES

PRESSURE CAPSULE DETAILS

No. Description
1. Pressure housing (SS 316)
2. Diaphragm (Teflon)
3. Plunger
4. Steel ring (SS 316)
5. 'O' ring (Teflon)
6. Disc

6
5
4
3
2
Note : wetted parts are mentioned in italics. 1 *Presure ports are brazed with flange

INSTALLATION DRAWING
MOUNTING HOLES, Ø7
2 NOS 130.0
98.0 (5.11)
(3.85)
(3.42)
87
(4.64)

(2.0)

(2.0)
118

51

51
(4.84)

(1.22)
31

31

48.0 Cable Entry 18

(1.88) 1/2" NPT or (0.70)
M20x1.5 149
(5.86)
mm
APPROX. DIMENSIONS IN
inches

BULLETIN NO. : KA170725

2 5
7
 HIGH PRESSURE RANGES MT
RANGE SELECTION TABLE

Range Code Range bar (psi) †Differential bar (psi) Maximum Working
Approximate Pressure bar (psi)
Maximum
for "A1"
microswitch
0.067 - 0.213 0.02 5
LP (0.97 - 3.09) (0.29) (72.52)

0.1 - 0.5 0.08 5

LP5 (1.45 - 7.25) (1.16) (72.52)

0.1 - 1.0 0.10 12

H01 (1.45 - 14.50) (1.45) (174.05)

0.1 - 1.5 0.12 12

H02 (1.45 - 21.76) (1.74) (174.05)

0.2 - 2.6 0.20 12

H03 (2.90 - 37.71) (2.90) (174.05)

0.2 - 3.6 0.20 12

H04 (2.90 - 52.21) (2.90) (174.05)

0.5 - 7.0 0.40 12

H07 (7.25 - 101.50) (5.80) (174.05)

0.5 - 10.0 0.40 25

H10 (7.25 - 145.38) (5.80) (362.6)

1.0 - 15.0 0.80 25

H15 (14.5 - 217.56) (11.60) (362.6)

5.0 - 25.0 0.80 35

H30 (72.52 - 362.6) (11.60) (507.63)

*Minimum differential increases with setpoint, values with neoprene diaphragm (Graphs available on request)
* Differentials of miroswitches A2 through A9 will vary. Differentials for A7 are typically twice that for A1 microswitch.
Please indicate specifically the differential value in enquiry/order, when it is critical in your application.

BULLETIN NO. : KA170725

5
7 3
 HOW TO ORDER INDUSTRIAL HIGH RANGE PRESSURE SWITCHES

Group 1
Non standard
Group 2
Model
Group 3
Cable Entry Size
Group 4
Switch Type
Group 5
Range Code
Group 6
Microswitch
Group 7
Pressure Port
Group 8
Diaphragm
MT
allocation (values in bar) Type Material / Size

Reserved for MT = 1= PF2 = LP = A1 = General S1 = 0=

BULLETIN NO. : KA170725

non-standard Industrial Al. head pressure switch, (0.067 - 0.213) purpose microswitch SS316 / ¼" BSP(F) Neoprene
options not pressure switch ½" NPT threads fixed differential rated at 15 A; 250 S2 =
LP5 = 1=
covered in with diecast 3= with scale in bar VAC
(0.1 - 0.5) SS316 / ¼” NPT(F) Teflon
catalogue. Will Aluminium Al. head A2 = Hermetically
PF3 =
be given by enclosure to M20 X 1.5 H01 = sealed for corrosive 2=
pressure switch,
manufacturer, IP66 as per threads (0.1 - 1.0) environments SS 316L
fixed differential
only after IS/IEC 60529
with scale in psi H02 A3 = gold plated 3=
agreement of
(0.1 - 1.5) contacts for low Hastelloy C
supply details PA2 =
voltage applications
with customer. pressure switch, H03 = 4=
adjustable (0.2 - 2.6) A4 = DPDT Monel
differential with configuration
H04 =
scale in bar
HIGH PRESSURE RANGES

(0.2 - 3.6) A5 = for high DC

4
PA3 = ratings
H07 =
pressure switch, A7 = 2SPDT
(0.5 - 7.0)
adjustable switching elements
differential with H10 =
scale in psi (0.5 - 10.0) A9 = General
purpose microswitch
H15 = rated at 5 A; 250
(1.0 - 15.0) VAC
H30 =
(5.0 - 25.0)

eg. Industrial switch with ½" NPT cable entry in aluminium housing as 1SPDT pressure switch, fix differential with scale having 0.1 bar to 1 bar pressure
range, with 15 Amp. microswitch, SS316 pressure housing with ¼” BSP port size & neoprene diaphragm shall be specified by
Group 1 Group 2 Group 3 Group 4 Group 5 Group 6 Group 7 Group 8
MT 1 PF2 H01 A1 S1 0
Please specify full model number to avoid ambiguity.

5
7
MD HIGH RANGE DP
Locking screws
for drift proof Separate
settings terminal block
for wiring

Large springs Robust

for easy setting microswitch
for reliable
switching
Unique scale
enhancement Bearing
mechanism for surface of
fine setting lever for
resolution smooth motion

Incast pin
Bell crank as a robust
lever for fulcrum
movement
transmission

Protective cap for

Extra large tamperproof settings
Captive cover screws
scale with
finer least
counts for
easier setting Environment
protected
switch with
IP66 protection
External
mounting holes
for easy
mounting/
dismantling
Choice of
conduit entries
for various
cable sizes

Approximate Weight : 2.500 Kg. Electrical Fig. 2

Connection :
Some Applications : Applications requiring high Z 2 3
static/system pressure but low pressure difference.

1
Bulletin No. KA121024
5
7 144
 HIGH RANGE DP MD

PRESSURE CAPSULE DETAILS

No. Description
1. Pressure Housing
2. Diaphragm
3. Plunger
3 1 4. O-Ring
5. Disc
2 4

Note : wetted parts are mentioned in italics.

INSTALLATION DRAWING
147.0
(5.78)
130.0
SET SCREW CAP (5.11)
112.5 62
(4.43) (2.44)
(0.78)
20

(2.79)
71

MOUNTING HOLES
(6.33)

2 Nos. Ø6.5
161

0.25
CABLE ENTRY

PRESSURE PORT
LOW PRESSURE PORT 1/4" BSP (F)
HIGH PRESSURE PORT
37
(1.45) 30
mm
(1.18) APPROX. DIMENSIONS IN
inches

Bulletin No. KA121024

145 5
7
MD HIGH RANGE DP

RANGE SELECTION TABLE

Range Code Range Differential* bar (psi) Maximum

bar (psi) Approximate Working Pressure
Maximum bar (psi)
for "A1"
microswitch
0.1 - 1.0 0.12 70
D01 (1.45 - 14.50) (1.74) (1015.26)

0.1 - 1.5 0.20 70

D02 (1.45 - 21.76) (2.90) (1015.26)

0.2 - 2.6 0.20 70

D03 (2.90 - 37.71) (2.90) (1015.26)

0.2 - 3.6 0.30 70

D04 (2.90 - 52.21) (4.35) (1015.26)

0.5 - 7.0 0.40 70

D07 (7.25 - 101.50) (5.80) (1015.26)

0.5 - 10.0 0.50 70

D10 (7.25 - 145.04) (7.25) (1015.26)

1.0 - 15.0 0.50 70

D15 (14.50 - 217.71) (7.25) (1015.26)

5.0 - 25.0 0.80 70

D30 (72.52 - 362.6) (11.60) (1015.26)

*Minimum differential increases with setpoint (Graphs available on request)

* Note :
Microswitches A2 through A9 can be supplied in some ranges and differentials will vary with microswitch used.
Please contact sales office for details. Please check availability of adjustable differential with sales office.

Bulletin No. KA121024

5
7 146
 HOW TO ORDER INDUSTRIAL HIGH RANGE DP SWITCHES

Group 1 Group 2 Group 3 Group 4 Group 5 Group 6 Group 7 Group 8

Non standard Model Cable Entry Size Switch Type Range Code Microswitch Pressure Port Diaphragm
allocation (values in bar) Type Material / Size

Reserved for MD = 1= DF1 = pressure D01 = A1 = A1 = 0=

non-standard Industrial ½ “ NPT threads difference switch, (0.1 - 1.0) General purpose Aluminium / Neoprene
options not pressure switch fixed differential microswitch ¼" BSP(F)
2= D02 1=
covered in with diecast without scale rated at
¾” NPT threads (0.1 - 1.5) A2 = Teflon
catalogue. Will Aluminium DF2 = pressure 15 A; 250 VAC
Aluminium /
be given by enclosure to 3= difference switch, D03 = *A2 = 2=
¼” NPT(F)
manufacturer, IP66 as per M20 X 1.5 fixed differential with (0.2 - 2.6) Hermetically SS316L
only after IS2147 threads scale in bar sealed for S1 =
agreement of D04 = SS316 /
DF3 = pressure (0.2 - 3.6) corrosive
supply details environments ¼" BSP(F)
with customer. difference switch,
D07 = S2 =
fixed differential with (0.5 - 7.0) *A3 = gold
scale in psi plated contacts SS316 /
D10 = for low voltage ¼” NPT(F)
*DA1 = pressure
difference switch, (0.5 - 10.0) applications

147
adjustable differential D15 = *A4 = DPDT
without scale (1.0 - 15.0) configuration
*DA2 = pressure D30 = *A5 = for high
difference switch, (5.0 - 25.0) DC ratings
adjustable differential
*A7 = 2SPDT
with scale in bar
switching
*DA3 = pressure elements
difference switch, For additional
adjustable differential Please refer page no. 230
wetted parts
with scale in psi for more microswitch please refer
*Available with A9 options
Please refer page no.
Pressure Capsule
(in group 6) only * Please refer note under 226 & 227 for more Details on
Range Selection Table pressure port options Page 145

eg. A high range pressure difference weatherproof switch, with ½" NPT cable entry in aluminium housing as 1SPDT pressure switch, fixed differential without scale, having 0.1 bar to 1 bar
pressure range, with 15 Amp. microswitch, SS316 pressure housing with ¼” BSP port size & neoprene diaphragm shall be specified by
HIGH RANGE DP

Group 1 Group 2 Group 3 Group 4 Group 5 Group 6 Group 7 Group 8

MD 1 DF1 D01 A1 S1 0
Please specify full model number to avoid ambiguity.

Bulletin No. KA121024

5
7
MD
MZ TEMPERATURE SWITCHES

Transparent tough Internal setscrew

polycarbonate cover to avoid
for visibility easy access
to setpoint

Separate Large spring

terminal block for ease of
for wiring setpoint

IP66 enclosure
for excellent
ingress protection

Sealing facility
Cable gland as a to avoid
standard accessory tampering of
working switch

Non corroding
exteriors for a
long life
of the switch

Brass bulb
for sensing
temperature

Approximate Weight : 0.700 Kg. Electrical Connection :

Fig. 2
Some Applications :
To detect limiting temperature levels in Z 2 3
non-hazardous areas.
1

Bulletin No. KA121024

5
7 222
 TEMPERATURE SWITCHES MZ

INSTALLATION DRAWING

95.0
3.74
115.0 85.0
4.53 3.35

Cover Locking
Screw
4 Nos.
125.0
4.92
40.0
1.58

5.5
Cable Entry
(0.37)

Slot Width (0.22)

Ø9.5

2 Nos. for Mounting

50.0
1/2" NPT(M)
1.97
Options Available 51.0
S.S. Capillary Tube 2.0 Mtr. Lg. 100.0 2.01
3.94

mm
APPROX. DIMENSIONS IN
inches

Bulletin No. KA121024

223 5
7
MZ TEMPERATURE SWITCHES

RANGE SELECTION TABLE

Range Code Range oC Differential* oC ( oF) Maximum

( oF) Approximate Working Temperature
o
Maximum C
for "A1" ( oF)
microswitch
25 - 90 15 150
T1H (77 - 194) (59) (302)

70 - 150 20 200
T2H (158 - 302) (68) (392)

120 - 215 30 300

T3H (248 - 419) (86) (572)

* Approximate differential at midrange for A1 microswitch. Differentials increase with setpoint.

Diffferentials vary with microswitch combinations. Please consult sales office for details

Bulletin No. KA121024

5
7 224
 HOW TO ORDER PROCESS TEMPERATURE SWITCHES

Group 1 Group 2 Group 3 Group 4 Group 5 Group 6 Group 7 Group 8

Non standard Gas Group Cable Entry Size Switch Type Range Code Microswitch Temp. Bulb Capillary
allocation Classification (values in Type Material / Size Material / Size
Deg. Cen.)
Reserved for MZ = 3= TF1 = T1H = A1 = General B1 = Brass / 2=
Non-standard Process M20 X 1.5 Temperature 25 - 90 purpose microswitch Dia. 9.5 mm, 123 SS316 /
Options not temperature threads Switch fixed rated at 15 A; 250 mm length, with 3/8" 2.0 meter
T2H =
covered in switch with tough differential VAC BSP (M) thermowell
70 - 150
Catalogue. Will transparent without scale connection
A7 = 2SPDT
Be given by polycarbonate T3H =
TF2 = switching elements B2 = Brass /
Manufacturer, Enclosure to 120 - 215
Temperature A8 = General Dia. 9.5 mm, 123
Only after IP66 as per
Switch fixed purpose microswitch mm length, with 3/8"
Agreement of IS2147
differential with rated at 5A; 250 VAC NPT (M) thermowell
Supply details
scale in oC connection
With customer. A9 = General
purpose microswitch B3 = Brass /
rated at 5A; 250 VAC Dia. 9.5 mm, 123
mm length, with 1/2"
NPT (M) thermowell

225
connection

E.g. A Process Temperature switch, with M20x1.5 cable entry as 1 SPDT, fixed differential with scale, having 25°C to 90°C temperature range, with
15 Amp. microswitch, with Brass 9.5 mm diameter bulb, having length 123 mm with 3/8”BSP(M),with 2.0 meter SS316 capillary length shall be
specified by
TEMPERATURE SWITCHES

Group 1 Group 2 Group 3 Group 4 Group 5 Group 6 Group 7 Group 8

MZ 3 TF2 T1H A1 B1 2
Please specify full model number to avoid ambiguity.

Bulletin No. KA121024

5
7
MZ
MZ HIGH RANGE PRESSURE SWITCHES

Transparent tough Internal setscrew

polycarbonate cover to avoid
for visibility easy access
to setpoint

Large spring
for ease of
Separate setpoint
terminal block
for wiring
IP66 enclosure
for excellent
ingress protection

Sealing facility
to avoid
tampering of
working switch

Cable gland as a
standard accessory

Non corroding exteriors SS316 & teflon as wetted parts

for a long life of the switch to switch a wide variety of media

Approximate Weight : 0.550 Kg. Electrical Connection :

Fig. 2
Some Applications :
Used in humid or slightly corrosive atmosphere like Z 2 3
jet dyeing machines, etc.
1

Bulletin No. KA121024

186
 HIGH RANGE PRESSURE SWITCHES MZ

PRESSURE CAPSULE DETAILS

No. Description
6 1. Pressure Housing (SS316)
5 2. Diaphragm (Teflon®)
4 3. Plunger
3 4. Steel Ring (SS316)
2 5. O-Ring (Teflon®)
6. Disc
1
Note : wetted parts are mentioned in italics.

INSTALLATION DRAWING 93
(3.66)
114
85
(4.48)
(3.34)

Cover Locking Screw

(3.26)

4 Nos.
83
(4.88)
124

(0.98)

5.5
25

Cable Entry (0.22)

Mounting Bracket 41
(1.61)
Pressure Port 50
50
1/4" BSPF Std. (1.97)
(1.97) mm
(Options Avail.) APPROX. DIMENSIONS IN
inches

Bulletin No. KA121024

187 5
7
MZ HIGH RANGE PRESSURE SWITCHES

RANGE SELECTION TABLE

Range Code Range bar (psi) Differential* bar (psi) Maximum Working
Approximate Pressure bar (psi)
Maximum
for "A8"
microswitch
0.067 - 0.213 0.05 5
LP† (0.97 - 3.09) (0.72) (72.52)

0.1 - 0.5 0.10 5

LP5
(1.45 - 7.25) (1.45) (72.52)

0.1 - 1.0 0.10 12

H01
(1.45 - 14.50) (1.45) (174.05)

0.1 - 1.5 0.20 12

H02
(1.45 - 21.76) (2.90) (174.05)

0.2 - 2.6 0.20 12

H03
(2.90 - 37.71) (2.90) (174.05)

0.2 - 3.6 0.20 12

H04
(2.90 - 52.21) (2.90) (174.05)

0.5 - 7.0 0.40 12

H07
(7.25 - 101.50) (5.80) (174.05)

0.5 - 10.0 0.60 25

H10
(7.25 - 145.04) (8.70) (362.6)

1.0 - 15.0 0.60 25

H15
(14.50 - 217.56) (8.70) (362.6)

5.0 - 25.0 0.80 35

H30
(72.52 - 362.6) (11.60) (507.63)

*Minimum differential increases with setpoint (Graphs available on request), results for neoprene diaphragm.
†Range not available in SS316 L diaphragm.

Bulletin No. KA121024

188
 HOW TO ORDER PROCESS HIGH RANGE PRESSURE SWITCHES

Group 1 Group 2 Group 3 Group 4 Group 5 Group 6 Group 7 Group 8

Non standard Model Cable Entry Size Switch Type Range Code Microswitch Pressure Port Diaphragm
allocation (values in bar) Type Material / Size

Reserved for MZ = 3= PF2 = LP = A8 = S1 = 0=

non-standard Process M20 X 1.5 pressure switch, (0.067 - 0.213) General purpose SS316 / ¼" BSP(F) Neoprene
options not pressure switch cable gland fixed differential microswitch S2 =
LP5 = 1=
covered in with tough with scale in bar rated at
(0.1 - 0.5) SS316 / ¼” NPT(F) Teflon
catalogue. Will transparent 5 A; 250 VAC
PF3 =
be given by polycarbonate H01 = 2=
pressure switch, A7 =
manufacturer, enclosure to (0.1 - 1.0) SS 316L
fixed differential 2SPDT
only after IP66 as per
with scale in psi H02 microswitches 4=
agreement of IS2147
(0.1 - 1.5) Monel
supply details *PA2 = A9 =
with customer. pressure switch, H03 = General purpose
adjustable (0.2 - 2.6) microswitch
differential with rated @ 5A,
H04 =
scale in bar 250 VAC
(0.2 - 3.6)
*PA3 =

189
H07 =
pressure switch,
(0.5 - 7.0)
adjustable
differential with H10 =
scale in psi (0.5 - 10.0)
*Available only with H15 =
option A9 in Group 6
(1.0 - 15.0)
H30 =
(5.0 - 25.0)

Please refer page no.

* Please refer note under 226 & 227 for more
Range Selection Table pressure port options

eg. A process pressure switch with fixed differential having 0.1 bar to 1 bar pressure range, with 5 Amp. microswitch, SS316 pressure housing with ¼” BSP
port size & neoprene diaphragm shall be specified by
HIGH RANGE PRESSURE SWITCHES

Group 1 Group 2 Group 3 Group 4 Group 5 Group 6 Group 7 Group 8

MZ 3 PF2 H01 A8 S1 0
Please specify full model number to avoid ambiguity.

Bulletin No. KA121024

5
7
MZ
MD HIGH PROOF HIGH RANGE PRESSURE SWITCHES
Large springs
for easy setting
Locking screws
Separate
for drift proof
terminal block
settings
for wiring

Robust
microswitch
Unique scale for reliable
enhancement switching
mechanism for
fine setting Bearing
resolution surface of
lever for
smooth motion
Bell crank
lever for Incast pin
movement as a robust
transmission fulcrum

Protective cap for

tamperproof settings
Extra large
scale with Captive cover screws
finer least
counts for
easier setting Environment
protected
switch with
IP66 protection

External
mounting holes
for easy
mounting/
dismantling
Choice of
conduit entries
for various
cable sizes

Approximate Weight : 1.200 Kg. Electrical Fig. 2

Connection :
Some Applications : High pressure gas handling systems, Z 2 3
in non-hazardous areas where the maximum pressure is
high and tripping value is low.
1
Bulletin No. KA121024
5
7 100
 HIGH PROOF HIGH RANGE PRESSURE SWITCHES MD

PRESSURE CAPSULE DETAILS

5
4 No. Description
1. Pressure Housing
3
2. Plunger
2 3. Diaphragm (Teflon®)
1 4. Steel Ring (SS316 as per pr. hsg. material)
5. O-Ring (Teflon®)
Note : wetted parts are mentioned in italics.

INSTALLATION DRAWING
147
(5.78)
Set Screw Cap 112.5 62
(4.43) (2.44)
(3.07)
78
(4.18)
106.2

(0.78)
20

(2.79)
71

(4.48)
114

Mounting Holes
2nos, Ø6.5
(0.25)

Cable Entry
Pressure Port
30
37 1/4" BSP(F)
(1.18)
(1.45)
mm
APPROX. DIMENSIONS IN
inches

Bulletin No. KA121024

101 5
7
MD HIGH PROOF HIGH RANGE PRESSURE SWITCHES

RANGE SELECTION TABLE

Range Code Range bar (psi) Differential* bar (psi) Maximum Working
Approximate Pressure bar (psi)
Maximum
for "A1"
microswitch
0.067 - 0.213 0.04 70
PP (0.97 - 3.09) (0.58) (1015.27)

0.1 - 0.5 0.15 70

PP5 (1.45 - 7.25) (2.176) (1015.27)

0.1 - 1.0 0.20 70

P01 (1.45 - 14.50) (2.90) (1015.27)

0.1 - 1.5 0.20 70

P02 (1.45 - 21.76) (2.90) (1015.27)

0.2 - 2.6 0.30 70

P03 (2.90 - 37.71) (4.35) (1015.27)

0.2 - 3.6 0.40 70

P04 (2.90 - 52.21) (5.80) (1015.27)

0.5 - 7.0 0.60 70

P07 (7.25 - 101.50) (8.70) (1015.27)

0.5 - 10.0 0.80 70

P10 (7.25 - 145.04) (11.60) (1015.27)

1.0 - 15.0 1.50 70

P15 (14.5 - 217.6) (23.21) (1015.27)

5.0 - 25.0 2.00 70

P30 (72.52 - 362.5) (29.00) (1015.27)

*Minimum differential increases with setpoint, values with neoprene diaphragm (Graphs available on request)

* Note :
Microswitches A2 through A9 can be supplied in some ranges and differentials will vary with microswitch used.
Please contact sales office for details. Please check availability of adjustable differential with sales office.

Bulletin No. KA121024

5
7 102
 HOW TO ORDER INDUSTRIAL HIGH PROOF HIGH RANGE PRESSURE SWITCHES

Group 1 Group 2 Group 3 Group 4 Group 5 Group 6 Group 7 Group 8

Non standard Model Cable Entry Size Switch Type Range Code Microswitch Pressure Port Diaphragm
allocation (values in bar) Type Material / Size

Reserved for MD = 1= PF1 = pressure PP = A1 = General S1 = 0=

non-standard Industrial ½ “ NPT threads switch, fixed (0.067 - 0.213) purpose microswitch SS316 / ¼" BSP(F) Neoprene
options not pressure switch differential without rated at 15 A; 250 S2 =
2= PP5= 1=
covered in with diecast scale VAC
¾” NPT threads (0.1 - 0.5) SS316 / ¼” NPT(F) Teflon
catalogue. Will Aluminium PF2 = pressure *A2 = Hermetically
be given by enclosure to 3= switch, fixed P01 = sealed for corrosive 2=
manufacturer, IP66 as per M20 X 1.5 differential with scale (0.1 - 1.0) environments SS 316L
only after IS2147 threads in bar P02 *A3 = gold plated
agreement of
PF3 = pressure (0.1 - 1.5) contacts for low
supply details
switch, fixed voltage applications
with customer. P03 =
differential with scale (0.2 - 2.6) *A4 = DPDT
in psi configuration
P04 =
*PA1 = pressure (0.2 - 3.6) *A5 = for high DC
switch, adjustable ratings

103
differential without P07 =
scale (0.5 - 7.0) *A7 = 2SPDT
switching elements
*PA2 = pressure P10 =
switch, adjustable (0.5 - 10.0) *A9 = General
differential with scale purpose microswitch
P15 = rated at 5 A; 250
in bar
(1.0 - 15.0) VAC
*PA3 = pressure
switch, adjustable P30 =
differential with scale (5.0 - 25.0)
Please refer page no. 230
in psi for more microswitch
*Available with A9 options
Please refer page no.
(in group 6) only * Please refer note under 226 & 227 for more
Range Selection Table pressure port options

eg. A high proof high range weatherproof switch with ½" NPT cable entry in aluminium housing as 1SPDT pressure switch, fixed differential without scale, having 0.1 bar to 1 bar pressure
HIGH PROOF HIGH RANGE PRESSURE SWITCHES

range, with 15 Amp. microswitch, SS316 pressure housing with ¼” BSP port size & neoprene diaphragm shall be specified by
Group 1 Group 2 Group 3 Group 4 Group 5 Group 6 Group 7 Group 8
MD 1 PF1 P01 A1 S1 0
Please specify full model number to avoid ambiguity.

Bulletin No. KA121024

5
7
MD
 PRESSURE SWITCHES
PRESSURE DIFFERENCE SWITCHES
VACUUM SWITCHES
From 1.5 mbar to 600 bar

MT Low Range
Pressure Switches
CATALOGUE

Certificate No.: FM72815

Kaustubha Udyog AN ISO9001:2008 COMPANY
S. No. 36/1/1, Sinhgad Road, Vadgaon Khurd,
Near Lokmat Press, Pune 411 041 INDIA
Tel. : +91-(0) 20-24393577 / 24393877
Telefax : +91-(0) 20-24393577 / 25460486
Email : pressure@vsnl.com
Website : http://www.orion-instruments.com
BULLETIN NO. : KA160822
MT LOW RANGE PRESSURE SWITCHES

PRESSURE CAPSULE DETAILS

No. Description
11 1. Pressure port (S.S.)
9 2. Support spring (S.S.)
10
3. Bottom flange (S.S.)
8 4. Support plate (Aluminium)
5. Diaphragm (Neoprene)
7
6. Gasket (Teflon)
7. Top plate (Aluminium)
8. Top flange (S.S.)
6
9. Plunger
10. Top flange screw (S.S.)
5
2 11. Sealing 'O' ring (Nitrile)
4
3
1
Note : wetted parts are mentioned in italics. *Presure ports are brazed with flange

INSTALLATION DRAWING 158

Mounting Holes, Ø7 (6.27)
130.0
98.0 2 NOS (5.11)
(3.85) 18
(0.70)
(3.42)
87

(2.0)
51
(2.0)

(1.22)
51

(1.22)

31
31
(4.64)
118

65 1/4" BSP(M)
(2.55) Mounting Nut
Ø130
(5.11)
Pressure port
mm
1/4" BSP(F) APPROX. DIMENSIONS IN
inches

BULLETIN NO. : KA160822

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 LOW RANGE PRESSURE SWITCHES MT
RANGE SELECTION TABLE

Range Code Range Differential* mbar ("wc) Maximum Working

mbar ("wc) Approximate Pressure bar (psi)
Maximum
for "A1"
microswitch
1.5 - 15.0 3 2
L02 (0.602 - 6.021) (1.204) (29.00)

5.0 - 25.0 5 2
L03 (2.007 - 10.037) (2.007) (29.00)

10.0 - 50.0 5 2
L05 (4.015 - 20.073) (2.007) (29.00)

10.0 - 100.0 10 2
L10 (4.015 - 40.146) (4.015) (29.00)

10.0 - 150.0 10 2
L15 (4.015 - 60.22) (4.015) (29.00)

20.0 - 250.0 15 2
L25 (8.029 - 100.36) (6.021) (29.00)

50.0 - 350.0 25 2
L35 (20.073 - 140.52) (10.036) (29.00)

*Minimum differential increases with setpoint, values with neoprene diaphragm (Graphs available on request)
* Differentials of miroswitches A2 through A9 will vary. Differentials for A7 are typically twice that for A1 microswitch.
Please indicate specifically the differential value in enquiry/order, when it is critical in your application.

BULLETIN NO. : KA160822

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 HOW TO ORDER INDUSTRIAL LOW RANGE PRESSURE SWITCHES

Group 1
Non standard
Group 2
Model
Group 3
Cable Entry Size
Group 4
Switch Type
Group 5
Range Code
Group 6
Microswitch
Group 7
Pressure Port
Group 8
Diaphragm
MT
allocation (values in mbar) Type Material / Size

Reserved for MT = 1= PF1 = pressure L02 = A1 = General M1 = 0=

BULLETIN NO. : KA160822

non-standard Industrial Al. head switch, fixed (1.5 - 15) purpose microswitch M.S. powder coated / Neoprene
options not pressure switch ½" NPT threads differential without rated at 15 A; 250 ¼" BSP(F)
L03 = 1=
covered in with diecast 3= scale VAC
(5 - 25) M2 = Teflon
catalogue. Will Aluminium Al. head PF2 = pressure *A2 = Hermetically M.S. powder coated /
be given by enclosure to M20 X 1.5 switch, fixed L05 = sealed for corrosive 2=
¼” NPT(F)
manufacturer, IP66 as per threads differential with scale (10 - 50) environments SS316L
only after IS/IEC 60529 in mbar S1 =
L10 = *A3 = gold plated
agreement of SS316 /
PF3 = pressure (10 - 100) contacts for low
supply details ¼" BSP(F)
with customer. switch, fixed L15 = voltage applications
differential with scale S2 =
(10 - 150) *A4 = DPDT
in "wc SS316 /
L25 = configuration ¼” NPT(F)
*PA1 = pressure (20 - 250) *A5 = for high DC

4
switch, adjustable
L35 = ratings
differential without
scale (50 - 350) *A7 = 2SPDT
*PA2 = pressure switching elements
switch, adjustable *A9 = General
LOW RANGE PRESSURE SWITCHES

differential with scale purpose microswitch

in mbar rated at 5 A; 250
*PA3 = pressure VAC
switch, adjustable
differential with scale
in "wc
*Available with A9
(in group 6) only

eg. A low range weatherproof switch, with ½" NPT cable entry in aluminium housing as 1SPDT pressure switch, fixed differential without scale, having 5
mbar to 25 mbar pressure range, with 15 Amp. microswitch, SS316 pressure housing with ¼” BSP port size & neoprene diaphragm shall be specified by
Group 1 Group 2 Group 3 Group 4 Group 5 Group 6 Group 7 Group 8
MT 1 PF1 L03 A1 S1 0
Please specify full model number to avoid ambiguity.

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