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Float Operated Liquid Level Switch
Mobrey M-Switch
Float Operated Liquid Level Switch
- Reliably detects the liquid level to give a voltage free contact operation for alarm signalling or as a part of a pump control system
- Small in-tank dimensions, suitable for use where space in a vessel is limited
- Available for side mounting with either a flanged of 2-in. threaded connection
- Tough industrial build quality with 316 Stainless steel construction throughout
- European directive compliance
- ATEX and IECEx flameproof models (Ex d)
Specifications
| Attribute | Value |
| Device Type | Level Alarm Switch |
| Mounting Type | Side Mount |
| Switch Output | SPDT |
| Body Material | Stainless Steel |
| Minimum Operating Temperature | 0°C |
| Maximum Operating Temperature | +130°C |
| Maximum Current | 15 A ac, 250 mA dc |
| Maximum Pressure | 19bar |
| Gasket Material | Non Asbestos Carbon Fibre |
M-Switch Specifications
| General | |
| Product | M-Switch Float Operated Liquid Level Switch |
| Minimum liquid specific gravity | 0.75 |
| Differential | 1 in. (25mm) |
| Length into tank | 6 in. (153mm) |
| Float diameter | Ø1.9 in. (Ø48 mm) |
| Maximum float swing | 4.4 in. (112 mm) |
| Switching function (See Figure 1) | SPCO (Single-Pole-Change-Over) relay |
| Construction materials | |
| Wetside material | 316 Stainless steel |
| Body material | 316 Stainless steel |
| End cover material | 316 Stainless steel |
| Gasket | Non-asbestos for Mobrey 'A' flange |
| Ethylene propylene for Mobrey 'D' flange | |
| Electrical | |
| Conduit entry | M20 for flanged and BSPT threaded versions |
| 1/2-in. NPT for NPT threaded versions | |
| Maximum voltage and current | See Table 3 for the maximum voltage and current |
|
The microswitch contacts are gold-plated and are suitable for use in low-power circuits. Switching high-power circuits can permanently damage the gold-plating. Not suitable for the direct starting of large motors. |
|
| Environment | |
| Operating temperature | 32 to 266°F (0 to 130°C) |
| Ambient temperature | 32 to 140°F (0 to 60°C) |
| Operating pressure | See Table 2 for the maximum pressure ratings |
| Approvals | |
| Enclosure ratings |
Weatherproof M-Switch: IP66/67 (NEMA 4) |
|
Flameproof M-Switch: ATEX: II 1/2G Ex d IIC T6 Ga/Gb IECEx: Ex d IIC T6 Ga/Gb IP66/IP67 (NEMA 4) |
|
| Marine | Germanisher Lloyd |
Table 2. Maximum pressure ratings
| Mounting Arrangement |
Maximum P @ Troom | |||
| Weatherproof | Flameproof | |||
| Mobrey 'A' flange | 275 psi | 19 bar | 362 psi | 25 bar |
| Mobrey 'D' flange | 43 psi | 3 bar | Not applicable | |
| 2-in. BSPT threaded | 275 psi | 19 bar | 720 psi | 49.6 bar |
| 2-in. NPT threaded | 275 psi | 19 bar | 720 psi | 49.6 bar |
Table 3. Maximum voltage and current
| Maximum voltage and current |
AC | DC (Resistive) |
DC |
| Max. voltage (V) | 250 | 250 | 250 |
| Max. current (A) | 15 | 0.25 | 15 |
Table 4. Mobrey flange dimensions(1)
| Mobrey Flange | A | B | C | D(2) |
| Mobrey 'A' Flange | 3.6 (92) | 0.55 (14) | 3.6 (92) | 2.6 (66) |
| Mobrey 'D' Flange | 3.6 (92) | 0.35 (9) | 3.3 (83) | 2.0 (50) |
(1) Dimensions are in inches (mm)
(2) Mounting hole diameter D to be ±0.4 in. (1 mm).
Mobrey Side Mount (A Flange) St/St Level Switch SPDT Output Exd
Excl. VAT: £519.22
Incl. VAT: £623.06
