DS Hydraulic Diaphragm Pressure Switches
Product Information:
The DS Hydraulic Diaphragm Pressure Switches are a type of
process pressure switch with an IP66 rated enclosure. They are
designed for use in hydraulic systems and can handle pressure
ranges from 1 bar to 400 bar (14.50 psi to 5801.52 psi). The
switches feature a pressure capsule with wetted parts made of
stainless steel (SS) and a backup ring made of SS316. They come
with different range codes and microswitch types, allowing for
customization based on specific requirements.
Product Usage Instructions:
- Ensure that the pressure switch is compatible with the
hydraulic system being used. - Select the appropriate range code based on the desired pressure
range. Refer to the Range Selection Table in the user manual for
guidance. - Determine the required microswitch type based on the
application’s needs. Refer to Group 6 in the “How to Order” section
of the user manual for available options. - Choose the desired pressure port material and size. Refer to
Group 7 in the “How to Order” section of the user manual for
available options. - Install the pressure switch using the provided installation
drawing. Ensure that all components, such as the pressure port,
plunger, housing plate, and diaphragm, are properly assembled
according to the diagram. - Connect the pressure switch to the hydraulic system using
appropriate fittings and seals. - If using an adjustable differential pressure switch, set the
desired differential value using the provided scale in either bar
or psi, depending on the selected model. - Verify that the pressure switch is functioning correctly by
applying pressure within the specified range. Observe the
microswitch’s actuation and deactuation points, ensuring they meet
the operational requirements. - If actuation and deactuation at the same point is critical,
consider using a separate DPDT relay with a separate power supply
for its coil. This can help achieve the desired functionality. - If any further assistance is needed regarding the pressure
switch’s differential values or any other technical details,
contact the sales office for accurate information.
DS HYDRAULIC DIAPHRAGM
PRESSURE SWITCHES
Bulletin No. KA220802
Pressure Ranges from 1 bar to 400 bar
56
DS HYDRAULIC DIAPHRAGM PRESSURE SWITCHES
PRESSURE CAPSULE DETAILS
3 5 6
Note : wetted parts are mentioned in italics.
INSTALLATION DRAWING
Ø142 (5.59)
No. Description 1. Pressure Port (SS)
2. Plunger (SS)
3. Housing Plate (SS)
4. Diaphragm (SS)
5. O-Ring (PTFE®)
2
6. Backup Ring (SS316)
(Options Available)
4 1
*Pressure ports are brazed with flange
Pressure Port 1/4″ BSP(F) Std. (Options Avail.)
126 (4.96) 145
(5.71)
Mounting Holes 2 Nos. Ø7.0
0.27
75
57
APPROX. DIMENSIONS IN
mm inches
Bulletin No. KA220802
DS HYDRAULIC DIAPHRAGM PRESSURE SWITCHES
RANGE SELECTION TABLE
Range Code H1T
Range bar (psi)
1 – 10 (14.50 – 145.04)
Differential* bar (psi)
Approximate Maximum for “A8″
microswitch
1 (14.50)
Maximum Working Pressure
bar (psi) 150
(2175.51)
H2T
2 – 20 (29.00 – 290.07)
2 (29.00)
200 (2900.76)
H4T
5 – 40 (72.52 – 580.15)
5 (72.52)
200 (2900.76)
H1H
10 – 100 (146.04 – 1450.38)
12 (174.05)
200 (2900.76)
H2H
10 – 200 (145.03 – 2900.76)
24 (348.09)
400 (5801.52)
H4H
40 – 400 (580.15 – 5801.52)
70 (1015.27)
500 (7251.88)
Note:
1. The minimum differential increases with the setpoint. The differential values mentioned in the above table are approximate maximum for FSR. The differential value will vary according to the pressure range selected and microswitch type. For actual values of differential please contact sales office.
2. When using 2SPDT switching arrangement, both microswitches may not actuate and/or deactuate at the same point. A small stage gap, normally upto +/- 5% FSR (depending on range code) may be observed. The On-Off differential (hysterisis) typically tends to be atleast double of those published for 1SPDT pressure switches.
If actuation and/or deactuation at same point is critical part of operation, then it can be achieved by using a separate DPDT relay. This relay will need a separate power supply for it’s coil.
Bulletin No. KA220802
58
HYDRAULIC DIAPHRAGM PRESSURE DS SWITCHES
HOW TO ORDER PROCESS HYDRAULIC DIAPHRAGM PRESSURE SWITCHES
Group 1
Non standard allocation
Reserved for non-standard options not covered in catalogue. Will be given by manufacturer, only after agreement of supply details with customer.
Group 2 Model
DS = Process pressure switch with IP66 rated enclosure as per IS/IEC 60529
Group 3
Cable Entry Size and Material of Enclosure
Group 4 Switch Type
1 = Al. enclosure ½” NPT threads
2 = Al. enclosure ¾” NPT threads
3 = Al. enclosure M20 X 1.5 threads
7 = SS enclosure, ½” NPT threads
8 = SS enclosure, ¾” NPT threads
9 = SS enclosure, M20 X 1.5 threads
PF2 = pressure switch, fixed differential with scale in bar
PF3 = pressure switch, fixed differential with scale in psi
*PA2 = pressure switch, adjustable differential with scale in bar
*PA3 = pressure switch, adjustable differential with scale in psi
Group 5 Range Code (values in bar)
H1T = (0.5 – 10) H2T = (2 – 20) H4T = (5 – 40) H1H = (10 – 100) H2H = (7 – 200) H4H = (40 – 400)
Group 6
Microswitch Type
Group 7
Pressure Port Material / Size
Group 8 Diaphragm
A1 = General purpose microswitch, rated at 15 A; 250 VAC
*A6 = Adjustable deadband
*A7 = 2SPDT switching elements
S1 =
2 =
SS316 / ¼” BSP(F) SS316
S2 =
3 =
SS316 / ¼” NPT(F) Hastelloy C
4 = Monel
*A9 = General purpose microswitch
*B7 = 2SPDT Switching Elements
*B9 = 2SPDT Switching Elements
for adjustable
differential
59
57 Bulletin No. KA220802
*Available with A6, A9 & B9 (in group 6) only
* For detailed specifications of microswitches, please refer table on page no. 294 &295
Please refer page no. 290 & 291 for more pressure port options
eg. A industrial pressure switch with fixed differential having 5 bar to 40 bar pressure range, with 5 Amp. m icroswitch, SS316 pressure housing with ¼” BSP port size & neoprene diaphragm shall be specified by
Group 1
Group 2
Group 3
DS
3
Please specify full model number to avoid ambiguity.
Group 4 PF2
Group 5 H1T
Group 6 A1
Group 7 S1
Group 8 2
