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 (Conductive)
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).