PRODUCTS

DIFFERENTIAL PRESSURE SWITCHES TYPE D

FUNCTION

Indfos D Series Differential 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 differential pressures from 25 mm to 42 kg/cm2 ranges, these switches utilize a dual diaphragm sealed piston sensor which is capable of withstanding extremely high static pressures and at the same time provides set point repeatability of ±1%. 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 microswitches including hermetically sealed microswitches are available to meet different requirements of electrical ratings and environmental conditions.

D 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
:
 Dia 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
Process Connection
:
 1/4" NPT(F)
     
     
     
     
ORDERING TABLE  
A
D
4
B
2
0
C
D
D
X
P
K
E
600 PSI




 A.
ENCLOSURE
 D4
Die Cast Aluminium Weather Proof IP66 Enclosure 3/4" NPT (F) Cable Entry.
 D7
Die cast Aluminium Explosion Proof (Group IIA/IIB ) Enclosure 3/4" NPT(F) Dual Cable Entry.
 D7(IIC)
Die Cast Aluminium Explosion Proof (Group II C) Enclosure 3/4" NPT(F) Dual Cable Entry.


 C.
ACTUATOR SEAL
CODE
DIAPHRAGM
MATERIAL
MAX
TEMP
°C
RANGE
mmH2O
kg/cm2
  B
  BUNA-N
65
•
•
  V
  VITON
150
•
•
  T
  TEFLON
65(1)
•
•
  S
  SS-316
150
•(2)
•(3)
(1) Max temp. can be increased to 150°C by using option XTV.
(2) With teflon gasket for sealing.
(3) Upto 7 kg/cm2 range.
 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
MAX. STATIC PR.
  LOW PRESSURE
  25 - 250 mm H2O   3800mm H2O (4)
  75 - 750 mm H2O   3800mm H2O (4)
  150 - 1500 mm H2O   3800mm H2O (4)
  250-2500 mm H2O   3800mm H2O (4)
  375 - 3750 mm H2O   3800mm H2O (4)
  HIGH PRESSURE
  0.1 - 1 kg/cm2
  33 kg/cm2
  0.2 - 2 kg/cm2   33 kg/cm2
  0.4 - 4 kg/cm2   33 kg/cm2
  0.7 - 7 kg/cm2   65 kg/cm2
  1.4 - 14 kg/cm2   65 kg/cm2
  2.8 - 28 kg/cm2   65 kg/cm2
  4.2 - 42 kg/cm2   130 kg/cm2


 
(4) Max Proof Pressure is 1.4 kg/cm2 Order Option XhX for 2.8 kg/cm2 max. static pressure and 11.2 kg/cm2 proof pressure.

  D. OPTIONS
Use Table from Detailed Catalogue

 
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