LOW RANGE PRESSURE
DIFFERENCE SWITCHES
FC/FE
KA231020 FC and FE Low Range Pressure Difference Switches
PRESSURE CAPSULE DETAILS
Note : wetted parts are mentioned in italics.
| No. | Description |
| 1 | High pressure port (S.S.)* |
| 2 | Support spring (S.S.) |
| 3 | Bottom flange (S.S.) |
| 4 | Support plate (Aluminium) |
| 5 | Diaphragm ( Neoprene) |
| 6 | Gasket (Nitrile) |
| 7 | Top plate (Aluminium) |
| 8 | Top flange (M.S.)* |
| 9 | Transfer pin (Aluminium) |
| 10 | ‘O’ ring (Nitrile) |
| 11 | Sealing diaphragm (Nitrile) |
| 12 | Top flange screw (S.S.) |
| 13 | Sealing ‘O’ ring (Nitrile) |
| 14 | Low pressure port (S.S.)* |
* Pressure ports are welded with flange
INSTALLATION DRAWING
RANGE SELECTION TABLE
| Range Code | Range mbar (“wc) | Differential* mbar (” wc) | Maximum Working Pressure bar (psi) |
| Approximate Maximum for “A1” microswitch | |||
| L02 | 1.5 to 15 (0.60 to 6.030) |
3.0 (1.205) |
2.0 (29.00) |
| L03 | 5 to 25 (2.009 to 10.047) |
5.0 (2.009) |
2.0 (29.00) |
| L05 | 10 to 50 (4.018 to 20.093) |
5.0 (2.009) |
2.0 (29.00) |
| L10 | 10 to 100 (4.018 to 40.180) |
5.0 (2.009) |
2.0 (29.00) |
| L15 | 10 to 150 (4.015 to 60.280) |
10.0 (4.018) |
2.0 (29.00) |
| L25 | 20 to 250 (8.037 to 100.466) |
10.0 (4.018) |
2.0 (29.00) |
| L35 | 50 to 350 (20.093 to 140.650) |
35.0 (14.065) |
2.0 (29.00) |
Note:
- 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.
- 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.
HOW TO ORDER FLAMEPROOF LOW RANGE PRESSURE DIFFERENCE SWITCHES
| Group 1 | Group 2 | Group 3 | Group 4 | Group 5 | Group 6 | Group 7 | Group 8 | ||||||||
| Non standard allocation |
Model | Cable Entry Size | Switch Type | Range Code (values in mbar) |
Microswitch Type |
Pressure Port Material / Size |
Diaphragm | ||||||||
 A prefix “N” isused in the model code in case of any non standard options / accessories that are provided with the switches. Will be given by manufacturer, only after agreement of supply details with customer. Bulletin No. KA231020 The prefix is subject to change as per specific requirement. |
FC = IP66 Flameproof pressure switch, ATEx, IECEx & PESO approved FE = IP66 Flameproof pressure switch, PESO approved |
1 = Al. head ½” NPT threads 2 = Al. head ¾” NPT threads 3 = Al. head M20 x 1.5 threads *4 = Grey CI head ½” NPT threads *5 = Grey CI head ¾” NPT threads *6 = Grey CI head M20 x 1.5 threads 7 = SS head ½” NPT threads 8 = SS head ¾” NPT threads 9 = SS head M20 x 1.5 threads *Not available in FE models |
D1 = pressure difference switch, fixed differential without scale D2 = pressure difference switch, fixed differential with scale in mbar D3 = pressure difference switch, fixed differential with scale in “wc For adjustable differential please select microswitches A6 or C6 in group 6 |
L02 = (1.5 – 15) L03 = (5 – 25) L05 = (10 – 50) L10 = (10 – 100) L15 = (10 – 150) L25 = (20 – 250) L35 = (50 – 350) |
A1 = General purpose microswitch rated at 15 A; 250 VAC *A6 = elements with adjustable deadband *A7 = 2SPDT switching elements A8 = General purpose microswitch rated at 5 A, 250 VAC; 5 A, 28 VDC *B7 = 2SPDT Switching Elements C6 = 1SPDT Adjustable Differentia Please refer to page nos. 120 & 121 for options and specifications of microswitches * Please contact sales office for additional information |
S1 = SS316 / ¼” BSP(F) S2 = SS316 / ¼” NPT(F) |
0 = Neoprene 1 = PTFE |
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Approx. switch weight in Kgs
|
For additional wetted parts please contact Sales Office |
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eg. A flameproof switch for gas group IIC, with ½” NPT cable entry in aluminium housing as 1SPDT pressure switch, 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 |
|
FC | 1 | D1 | L03 | A1 | S1 | 0 |
Please specify full model number to avoid ambiguity. If only the first two groups are specified while ordering, uncalibrated switches with standard wetted parts and enclosures will be supplied.
Bulletin No. KA231020
Documents / Resources
 |
Orion INSTRUMENTS KA231020 FC and FE Low Range Pressure Difference Switches [pdf] Owner's Manual KA231020, KA231020 FC and FE Low Range Pressure Difference Switches, FC and FE Low Range Pressure Difference Switches, FE Low Range Pressure Difference Switches, Low Range Pressure Difference Switches, Pressure Difference Switches, Difference Switches, Switches |