LEVEL SWITCHES TOP MOUNTING

Top Mounting Level Switch provided with 1 displacer hung on a metallic rope and 1 Electric Switch Assembly , designs up to ANSI 600 raiting.
It is provided with 1 displacer and 1 output, electric or pneumatic.
• The output trips when liquid rises (or falls) up to displacer and resets when falls (or rises) of 65 ±15mm (differential not changeable).
• Output: electric (1 or 2 microswitches SPDT with simultaneous action; within Ø155×200mm housing).
• Use: Alarm for Max or Min level, control of loading pump, etc.

Top Mounting Level Switch provided with 1 displacer hung on a metallic rope and 1 Pneumatic Switch Assembly, designs up to ANSI 600 raiting.
It is provided with 1 displacer and 1 output, electric or pneumatic.
• The output trips when liquid rises (or falls) up to displacer and resets when falls (or rises) of 65 ±15mm (differential not changeable).
• Output: pneumatic (1 valve ON-OFF, in Ø125×180mm housing).
• Use: Alarm for Max or Min level, control of loading pump, etc.

Top Mounting Level Switch provided with 2 displacer hung on a metallic rope and 1 or 2 Electric Switch Assembly , designs up to ANSI 600 raiting.
It is provided with 2 displacers and 1 output, electric or pneumatic.
• The output trips when liquid rises up to the displacer A, and resets when falls up to the displacer B (or on the contrary).
• The differential can be decided by the same installer: he will fix the displacer A at the trip height, and B at the reset height; in this way the gap between the two displacers corresponds to the wished differential.
The minimum differential is 160mm, with the 2 blocks placed under B.
• Output: electric (1 or 2 micros SPDT with simultaneous action : 110; in Ø155×200mm housing).
• Use: Loading of vessel, to stop a loading pump when level rises up to the displacer A, and to start it again when level falls to the displacer B.

Top Mounting Level Switch provided with 2 displacer hung on a metallic rope and 1 Pneumatic Switch Assembly, designs up to ANSI 600 raiting.
It is provided with 2 displacers and 1 output, electric or pneumatic.
• The output trips when liquid rises up to the displacer A, and resets when falls up to the displacer B (or on the contrary).
• The differential can be decided by the same installer: he will fix the displacer A at the trip height, and B at the reset height; in this way the gap between the two displacers corresponds to the wished differential.
The minimum differential is 160mm, with the 2 blocks placed under B.
• Output: pneumatic (1 valve ON-OFF, in Ø125×180mm housing).
• Use: Loading of vessel, to stop a loading pump when level rises up to the displacer A, and to start it again when level falls to the displacer B.

DF2B EExd Version

It is provided with 2 displacers and 2 electric outputs.
• The output 1 is activated by displacer A placed at L1, while the output 2 is activatd by displacer B placed at L2. The two trips are indipendent and depend only on the heights at which the displacers are fixed. Each of them resets with differential of 65 ±15mm.
DF2B operates as if it were composed by two DF1.
• Each output: 1 or 2 micros SPDT with simultaneous action within Ø155×200mm housing.
• Use: Alarm for Max or Min level. It operates as composed by two DF1.

Top Mounting Level Switch provided with 3 displacer hung on a metallic rope and 2 or 3 Electric Switch Assembly , designs up to ANSI 600 raiting.

The output 1 is activated by the displacer A placed at L1 (can be used as Max level alarm); the output 2 is activated by the displacer B placed at L2 125 (trip) and by the displacer C placed at L3 (reset). It can be used to control the loading/unloading pump.
In Ø155×200mm housing. It operates as if it were composed by one DF1 + one DF2A.

In Ø155×200mm housing.

It operates as if it were composed by a DF2A + a DF1.

Economic Top Mounting Level Switch provided with 1 displacer hung on a metallic rope and 1 Electric Switch Assembly , designs up to ANSI 600 raiting.

The DFCE Switches are mounted on top of vessel. The inside level of liquid is checked by the float integral with a vertical rope; when level rises up to the preset height, the float makes the output device trip (trip on rise); when level comes down again and exceeds the preset height, the float makes the output device come back to the initial position (reset on fall); between the set and reset heights there is always a gap, named differential, of 30 ±10mm. The output device is a composed by an electric microswitch, is snap action and is placed in the housing. The inverse function is available too : Trip on fall and Reset on rise; it can be reversed by Domizi Srl or by the same installer : it is sufficient to place the pneumatic switch on the contrary within the housing. Finish : first coat in epoxy resin and outer coat in green polyurethane resin, suitable for marine and tropical climates.
The Level Switches meet the ATEX standard.
Applications. They are fit for small and large dimensions vessels and for almost every kind of industrial liquids, where assure safety operations. Fit for pressures up to 1 Bar, and for liquids with specific gravity from 500kg/m³ up.
Connection to vessel. Top mounting by threaded body ¾” GAS-M (25mm threaded height). It can be in carbon steel, or stainless steel AISI 304 or 316. To fix the instrument, the vessel should have a handhole allowing to introduce the displacer and the rope, and to screw them onto the rod. Rope. In stainless steel AISI 316 and flexible; its length L defines the trip point of the Switch, and can be chosen 1m to 10m. The displacer Ø76×125mm in stainless steel AISI 316 can be fixed on the rope at the desired height, thanks to an adjustable block : in this way it is the user himself to decide the trip point.
Housing. It is in Aluminium casting. Size Ø155×200mm, EEx dc IIC T6 flame-proof, with 1 or 2 microswitches SPDT with simultaneous action.

Economic Top Mounting Level Switch provided with 1 displacer hung on a metallic rope and 1 Pneumatic Switch Assembly , designs up to ANSI 600 raiting.

The DFCG Switches are mounted on top of vessel. The inside level of liquid is checked by the float integral with a vertical rope; when level rises up to the preset height, the float makes the output device trip (trip on rise); when level comes down again and exceeds the preset height, the float makes the output device come back to the initial position (reset on fall); between the set and reset heights there is always a gap, named differential, of 30 ±10mm. The output device is a composed by a pneuamtic switch, is snap action and is placed in the housing. The inverse function is available too : Trip on fall and Reset on rise; it can be reversed by Domizi Srl or by the same installer : it is sufficient to fix the pneumatic valve on the contrary in the housing, as per the Instruction Manual attached to Switch. Finish : first coat in epoxy resin and outer coat in green polyurethane resin, suitable for marine and tropical climates.
The Level Switches meet the ATEX standard.
Applications. They are fit for small and large dimensions vessels and for almost every kind of industrial liquids, and specially for chemical industry (components of paints, solvents, trichloroethylene, etc), where assure safety operations. Fit for pressures up to 1 Bar, and for liquids with specific gravity from 500kg/m³ up.
Connection to vessel. Top mounting by threaded body ¾” GAS-M (25mm threaded height). It can be in carbon steel, or stainless steel AISI 304 or 316. To fix the instrument, the vessel should have a handhole allowing to introduce the displacer and the rope, and to screw them into the rod.
Rope. In stainless steel AISI 316 and flexible; its length L defines the trip point of the Switch, and can be chosen 1m to 10m. The displacer Ø76×125mm in stainless steel AISI 316 can be fixed on the rope at the desired height, thanks to an adjustable block : in this way it is the user himself to decide the trip point.
Housing. It is in Aluminium casting. Size Ø125×180mm, water-proof, with 1 pneumatic valve On/Off/Vent (usage pressure : 1÷5,5Bar / 15÷80psi), with 3 threaded holes ¼” NPT-F for input and output pipes of compressed air, as well as for vent recovery pipe. It can be provided with 2 manometers Ø40mm having 1/8” NPT-M connection.

Top Mounting Level Switch provided with 1 displacer integral with a vertical rod and 1 Pneumatic Switch Assembly , designs up to ANSI 300 raiting.

The DFK switches are mounted on top of vessel. The inside level of liquid is checked by the float integral with a vertical rod; when level rises up to the preset height, the float makes the output device trip (trip on rise); when level comes down again and exceeds the preset height, the float makes the output device come back to the initial position (reset on fall); between the set and reset heights there is always a gap, named differential. The inverse function is available too : Trip on fall and Reset on rise. The output device can be electric or pneumatic, is snap action and is placed in the housing.
Applications. They are fit for small and large dimensions vessels and for industrial fluids/liquids such as chemical, petrochemical, solvents, etc. For liquids with specific gravity from 500kg/m³ up. The Level Switches meet the ATEX standard.
Connection to vessel. Top mounting by flange with rating ANSI 150, 300, 600 300 psi. Flange is per ANSI or UNI/DIN standards, in carbon steel ASTM 105N, stainles steel AISI 304, or stainless steel AISI 316 : page 32-33. Housing (page 34-35).
Material : Aluminium cast, in electric or pneumatic version :
• 1 or 2 microswitches SPDT, simultaneous action (page 9); size : Ø155×200mm, flame-proof EEx dc IIC T6; 1 hole for electric connection : ¾ ” NPT-F threaded (or ½” NPT-F) housing-holder height: 80mm for temperatures of –20/+180°C 145mm for higher or lower temperatures.
• 1 pneumatic valve On/Off/Vent; Ø125×180mm, water-proof; 3 holes for air connection ¼” NPT-F : inlet, outlet and vent; housing-holder height : 70mm for temperatures of –20/+180°C 130mm for higher or lower temperatures. Rod. It defines the height at which the Switch trips; its length L changes on the basis of customer’s needs, with a maximum of 50-60cm. The rod, float, and other inner parts are in stainless steel AISI 316.
Differential. The Switch trips when level rises up to X point and resets when gos down to Y point, as per the side sketch; usually between X and Y there is a differential of 30÷65mm about : it changes on basis of the specific gravity of liquid. Also the inverse function is available: Trip on fall and Reset on rise.
Upon request, special versions can be produced too.