| DIMENSIONS |
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| DF755EX | |
DF755 and DF757 |
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1/2 NPT | |||
(140 mm) | For Electrical | ||
(194 mm) | |||
| Connection | ||
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| 1/2 NPT |
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(156 mm) |
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| Plug |
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1 NPT | 1/2 NPT | 1/4 in. (6 mm) | 1 NPT | |
For Electrical | ||||
(standard) | Tube Fitting | |||
Connection | (standard) | |||
| (DF756 only) | |||
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(143 mm)
TYPICAL APPLICATIONS
| Raw Water Tank |
| Clear Water Tank | OPL Series |
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| Transfer |
| SWICHGAGE® |
Supply | DF#1 | DF#5 |
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Pump | Injection Pump | |||
Pump | DF#2 |
| DF#6 |
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| DF#3 | Filter | DF#7 |
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| DF#4 |
| DF#8 |
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Typical Water Flood Control System
The diagram above displays eight DF Series switches installed on a Raw Water tank and a Clear Water tank. When raw water rises to predetermined level, DF#1 stops the supply pump. As tank level falls below the predetermined level, DF#2 starts the supply pump. If the tank level continues to fall, DF#3 initiates shutdown of the sup- ply pump. DF#4 stops transfer pump before raw water tank is com- pletely pumped out.
When clear water reaches the predetermined level, DF#5 stops the
transfer pump. As tank level falls to predetermined low level, DF#6 starts the transfer pump. If the tank level continues to fall due to the failure of the filters section, DF#7 initiates shutdown of the transfer pump. (DF755 located at this level will also operate backwash equipment). DF#8 stops injection pump before tank pumps com- pletely out.
An OPL Series pressure SWICHGAGE® stops injection pump when pressure reaches predetermined high or low pressure.
Tank with Low Pressure
Gas Blanket (DF755EX)
The DF755EX (below) is shown installed on a crude oil tank where a low pressure gas blanket is used to prevent evaporation loss. It is mounted directly to the side of the tank or on riser pipe 4 to 7 in. (102 to 178 mm) below level to be controlled. Pump automatically stops or starts when liquid reaches predetermined high or low level.
Fuel Tank
Gas Blanket
Gas Liquid
Typical Tank Mounting Methods (DF755)
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| Bull Plug Installation |
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| Drain Cock | ||||||
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Directly | Riser Pipe | Tank Wall Mounting | |
On Tank | Method | ||
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