Orion MD/MT Hydraulic Diaphragm Switch Instructions
PRESSURE CAPSULE DETAILS
Note: wetted parts are mentioned in italics.
No Description
- Pressure Housing (SS316)
- O-Ring ® (PTFE )
- Diaphragm ® (PTFE )
- Plunger
- Cushioning Pad (Options Available
INSTALLATION DRAWING
RANGE SELECTION TABLE
| Range Code | Range bar (psi) | Differential* bar (psi) | Maximum Working Pressure bar (psi) |
| Approximate Maximum for “A8” microswitch | |||
| H1T | 0.5 – 10 | 1 | 150 |
| (7.25 – 145.04) | (14.50) | (2175.51) | |
| H2T | 2 – 20 | 2 | 200 |
| (29.00 – 290.07) | (29.00) | (2900.76) | |
| H4T | 5 – 40 | 5 | 200 |
| (72.52 – 580.15) | (72.52) | (2900.76) | |
| H1H | 10 – 100 | 12 | 200 |
| (146.04 – 1450.38) | (174.05) | (2900.76) | |
| H2H | 7 – 200 | 24 | 400 |
| (101.52 – 2900.76) | (348.09) | (5801.52) | |
| H4H | 40 – 400 | 50 | 500 |
| (580.15 – 5801.52) | (725) | (7251.88) | |
| H7H | 70 – 700 | 70 | 800 |
| (1015.26 – 10152.64) | (1015.26) | (11603) | |
| H1K | 100 – 1000 | 100 | 1100 |
| (1450.37 – 14503.77) | (1450.37 ) | (15954.15) |
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.
Note: Welded diaphragm also available as shown
| Group 1 | Group 2 | Group 3 | Group 4 | Group 5 | Group 6 | Group 7 | Group 8 |
| Non standard allocation | Gas Group Classification | Cable Entry Size | Switch Type | Range Code (values in bar) | Microswitch Type | Pressure Port Material / Size | Diaphragm |
| Reserved for non-standard options not covered in catalogue. Will be given by manufacturer, only after agreement of supply details with customer. | MD =Industrial pressure switch with IP66 rated enclosure as per IS/IEC 60529MT =Industrial pressure switch with IP66 rated enclosure as per IS/IEC 60529 | 1 = Al. enclosure½” NPT threads*2 = Al. enclosure¾” NPT threads3 = Al. enclosure M20 X 1.5 threads7 = SS enclosure,½” NPT threads*8 = SS enclosure,¾” NPT threads9 = SS enclosure, M20 X 1.5 threads *Not available for MT modelFor dual cable entry contact Sales Office | PF1 = pressure switch, fixed differential without scalePF2 = pressure switch, fixed differential with scale in barPF3 = pressure switch, fixed differential with scale in psi*PA1 = pressure switch, adjustable differential without scale*PA2 = pressure switch, adjustable differential with scale in bar*PA3 = pressure switch, adjustable differential with scale in psi*Available with A6,A7, A9 & B9(in group 6) only | H1T = (0.5 – 10)H2T = (2 – 20)H4T = (5 – 40)H1H = (10 – 100)H2H = (7 – 200)H4H = (40 – 400)H7H = (70 – 700)H1K =100 – 1000) | A1 = General purpose microswitch, rated at 15 A; 250 VAC*A6 = Adjustable deadband*A7 = 2SPDTswitching elements*A8 = General purpose microswitch*A9 = General purpose microswitch*B7 = 2SPDTSwitching Elements*B9 = 2SPDTSwitching Elements for adjustable differential * For detailed specifications of microswitches, please refer note under Range Selection Table | S1 =SS316 / ¼” BSP(F)S2 =SS316 / ¼” NPT(F)S3 = (welded diaphragm) SS316 / 1” BSP(M)S4 =SS316 / ½” NPT(F)S5 = SS316 / ½” NPT(M)H1 =Hastelloy C / ¼” BSP(F)H2 =Hastelloy C / ¼” NPT(F)N1 =Monel / ¼” BSP(F)N2 =Monel / ¼” NPT(F) More options available.Please contact sales office. | 0 =Neoprene1 = PTFE2 =SS 316L3 =Hastelloy C4 =Monel |
eg. A hydraulic diaphragm pressure switch, with ½” NPT cable entry in aluminium housing as 1SPDT pressure switch, fixed differential without scale, having 5 bar to 40 bar pressure range, with 15 Amp. microswitch, SS316 pressure housing with ¼” BSP port size shall be specified by
| Group 1 | Group 2 | Group 3 | Group 4 | Group 5 | Group 6 | Group 7 | Group 8 |
 | MD | 1 | PF1 | H4T | A1 | S1 | 2 |
