PRODUCTS

PRESSURE SWITCHES TYPE B

FUNCTION

Indfos B series Pressure Switches are produced using technology provided by Dresser Industries USA, (ASHCROFT Division). These are sturdy, robust and precise devices, for use in process industries.

Available in various ranges covering pressure from 2.5 mm H2O to 210 Kg/cm2. B-Series switches utilise a diaphragm sealed piston sensor. This rugged sensor provides set point repeatability of ± 0.5%. Diaphragms are available in Buna-N, Viton, Teflon, Kapton, Stainless steel & Monel construction making the switch suitable for virtually any process fluid. Enclosures are available in weather proof (IP 66) and explosion proof (II A, B & C) versions and are die cast aluminium as a standard. A wide variety of 1 SPDT or 2 SPDT micro switches including hermetically sealed micro switches are available to meet different requirements of electrical ratings and environmental conditions.

B Series switches find applications in :

>>    Off Shore Oil Rigs
>>    Chemical & Petrochemical Plants
>>    Power Plants
>>    Steel Mills
>>    Pulp & Paper Mills
>>    Water & Sewage Treatment Plants
>>    Other Corrosive/Explosive Environments
>>    Nuclear Power Plants



SPECIFICATIONS

Enclosure
:
 Die Cast Aluminium (Weather proof or Explosion proof)
Sesing Element
:
 Diaphragm Sealed Piston (Buna-N, Viton, Teflon, Kapton, SS-316 or Monel)
Max Ambient Temp
:
 -30°C to 65°C
Switch Type
:
 1 SPDT / 2 SPDT
Mounting
:
 Surface/ Panel/ Direct
Process Connection
:
 1/4" NPT(F)
     
     
     
     
ORDERING TABLE  
A
B
4
B
2
0
C
B
D
X
P
K
E
600 PSI

 A.
ENCLOSURE
 B4
Die Cast Aluminium Weather Proof IP66 Enclosure 3/4" NPT (F) Cable Entry.
 B7
Die cast Aluminium Explosion Proof (Group IIA/IIB ) Enclosure 3/4" NPT(F) Dual Cable Entry.
 B7(IIC)
Die Cast Aluminium Explosion Proof (Group II C) Enclosure 3/4" NPT(F) Dual Cable Entry.

 










 C.
ACTUATOR SEAL (1)
CODE
DIAPHRAGM
MATERIAL
MAX
TEMP
°C
RANGE
VAC &
mm H2O
0-110
kg/cm2
210
kg/cm2
  B
  BUNA-N
65
•
•
•
  V
  VITON
150
•
•
•
  T
  TEFLON
65(1)
•
•
•
  S
  SS-316
150
 •(2) 
•
  
(1) Max temp. can be increased to 150°C by using
option XTV.
(2) Not available for vaccum ranges.
 B.
SWITCH TYPE
TYPE
RATING
CODE
1 SPDT
2 SPDT
Narrow dead band
 15 A 250 VAC
 0.4 A 120 VDC
20
61
General purpose
 15 A 250 VAC
 0.25 A 250 VDC
24
64
Heavy duty DC
 10 A 125 VDC
25
66
Environment proof
 15 A 250 VAC
 0.4 A 1125 VDC
26
62
Gold plated contacts
 1 A 125/250 VAC
31
70
Hermetically sealed
 5 A 250 VAC
 5 A 30 VDC
32
68
Hermetically sealed narrow deadband
 5 A 125/250 VAC
22
67
Hermetically Sealed Gold plated contacts
 1 A 125/250 VAC
42
71
Variable dead band
 15 A 250 VAC
50
-
Amonia Service
 5 A, 125/250 VAC
21
65
High temperature 300°F(150°C)
 15 A, 125/250 VAC
27
63
  E.   ADJUSTABLE RANGE
PROOF PRESS
  VACUUM 
  (-) 760-0 mm Hg   16 kg/cm2
  COMPOUND  
  (-) 375-(+) 375 mm H2O   1.4 kg/cm2 (3)
  (-) 760-(+) 760 mm H2O   1.4 kg/cm2 (3)
  (-) 1-(+) 1kg/cm2   16 kg/cm2
  (-) 1-(+) 2 kg/cm2   16 kg/cm2
  (-) 1-(+) 4 kg/cm2   16 kg/cm2
  WATER COLUMN
  2.5 - 25 mm H2O   1.4 kg/cm2 (3)
  5 - 50 mm H2O   1.4 kg/cm2 (3)
  12.5 - 250 mm H2O   1.4 kg/cm2 (3)
  37.5 - 750 mm H2O   1.4 kg/cm2 (3)
  75 - 1500 mm H2O   1.4 kg/cm2 (3)
  125 - 2500 mm H2O   1.4 kg/cm2 (3)
  187.5 - 3750 mm H2   1.4 kg/cm2 (3)
  PRESSURE
  0.1 - 1.0 kg/cm2
  33 kg/cm2
  0.2 - 2.0 kg/cm2   33 kg/cm2
  0.2 - 4.0 kg/cm2   33 kg/cm2
  0.35 - 7.0 kg/cm2   65 kg/cm2
  0.7 - 14.0 kg/cm2   65 kg/cm2
  1.4 - 28.0 kg/cm2   165 kg/cm2
  2.1 - 42.0 kg/cm2   165 kg/cm2
  3.5 - 70.0 kg/cm2   800 kg/cm2 (4)
  5.5 - 110.0 kg/cm2   800 kg/cm2 (4)
  7.0 - 140.0 kg/cm2   800 kg/cm2
  10.5 - 210.0 kg/cm2   800 kg/cm2
  D. OPTIONS
Use Table from Detailed Catalogue

(3) Max proof pressure is 11.2 kg/cm2 in case of
option XHX.
(4) Max proof pressure is 165 kg/cm2 in case of S.S.
diaphragm.
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