Orion Instruments MD-MT Pressure Switches Pressure Difference Switches Vacuum Switches Instructions
- October 30, 2023
- Orion Instruments
Table of Contents
Orion Instruments MD-MT Pressure Switches Pressure Difference Switches Vacuum Switches
MD
PRESSURE CAPSULE DETAILS
No. Description
- Pressure Housing (SS)
- Diaphragm ® (SS or PTFE )
- Plunger (SS)
- O-Ring (Viton)
- Disc (Al)
Note : wetted parts are mentioned in italics.
INSTALLATION DRAWING
MT
PRESSURE CAPSULE DETAILS
No. Description
- Pressure Housing (SS)
- Diaphragm ( ® PTFE )
- Plunger (SS)
- O-Ring (Viton)
- Disc (Al)
*Pressure ports are brazed with flange
Note : wetted parts are mentioned in italics
NSTALLATION DRAWING
RANGE SELECTION TABLE
Range Code| Range bar (psi)| *Differential bar (psi)|
Maximum Working Pressure bar (psi)
---|---|---|---
Approximate Maximum for “A1” micro switch**
D01| 0.1 – 1.0 (1.45 – 14.50)| 0.12 (1.74)| 70 (1015.26)
D02| 0.2 – 1.5 (2.90 – 21.76)| 0.20 (2.90)| 70 (1015.26)
D03| 0.2 – 2.6 (2.90 – 37.71)| 0.20 (2.90)| 70 (1015.26)
D04| 0.2 – 3.6 (2.90 – 52.21)| 0.40 (5.80)| 70 (1015.26)
D07| 0.5 – 7.0 (7.25 – 101.50)| 0.80 (11.60)| 70 (1015.26)
D010| 0.5 – 10.0 (7.25 – 145.04)| 1.00 (14.50)| 70 (1015.26)
D015| 1.0 – 15.0 (14.50 – 217.71)| 1.50 (21.75)| 70 (1015.26)
D30| 5.0 – 25.0 (72.52 – 362.6)| 2.00 (29.00)| 70 (1015.26)
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 deactivate at the same point. A small stage gap, normally upto +/- 5% FSR (depending on range code) may be observed. The On-Off differential (hysteresis) typically tends to be at least double of those published for 1SPDT pressure switches.
If actuation and/or deactivation 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 INDUSTRIAL HIGH RANGE DP 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 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 60529
MT = Industrial pressure switch with IP66 rated enclosure as per IS/IEC 60529
| 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
| DF1 = pressure difference switch, fixed differential without scale
DF2 = pressure difference switch, fixed differential with scale in bar
DF3 = pressure difference switch, fixed differential with scale in psi
*DA1 = pressure difference switch, adjustable differential without scale
*DA2 = pressure difference switch, adjustable differential with scale in bar
*DA3 = pressure difference switch, adjustable differential with scale in psi
| D01 = (0.1 – 1.0)
D02 (0.1 – 1.5)
D03 = (0.2 – 2.6)
D04 = (0.2 – 3.6)
D07 = (0.5 – 7.0)
D10 = (0.5 – 10.0)
D15 = (1.0 – 15.0)
D30 = (5.0 – 25.0)
| A1 = General purpose microswitch, rated at 15 A; 250 VAC
*A6 = Adjustable deadband
*A7 = 2SPDT switching elements
*A8 = General purpose microswitch
*A9 = General purpose microswitch
*B7 = 2SPDT Switching Elements
*B9 = 2SPDT Switching Elements for adjustable differential
| S1 = SS316 / ¼” BSP(F)
S2 = SS316 / ¼” NPT(F)
H1 = Hastelloy C / ¼” BSP(F)
H2 = Hastelloy C / ¼” NPT(F)
N1 = Monel / ¼” BSP(F)
N2 = Monel / ¼” NPT(F)
| 0 = Neoprene
1 = PTFE 2 = SS 316L
3 = Hastelloy C
4 = Monel
Not available for MT model For dual cable entry contact Sales Office| Available with A6, A9 & B9 (in group 6) only| * For detailed specifications of microswitches, please refer note under Range Selection Table| For additional wetted parts please contact sales office
eg. A high range pressure difference industrial switch, with ½” NPT cable entry in aluminum housing as 1SPDT pressure switch, fixed differential without scale, 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
---|---|---|---|---|---|---|---
▢
| MD| 1| DF1| D01| A1| S1| 0
Please specify full model number to avoid ambiguity.