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Level Control Equipment - Capacitance Level Control |
| Capacitance Level Control Equipment |
The LK371 is a digital indicating instrument which displays the tank level, it provides integral level switches and current output for panel, surface or rail mounting with LC-display for digital and quasi analogue demonstration.
Max 4 relays in pairs can be used as relay modules to switch various equipment. the modules can be retrofitted. LK371 is an indicating instrument and hence cannot be adjusted.
The indication is individually graduated between -9999 and 9999. The decimal point can be shifted. The indicated unit can be chosed individually. You can add a label with the units to cover.
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| Technical Specification |
The Four Basic Electrode Types.
LKFCP2- Insulated rod for conducting liquids such as water etc., Max Length = 3metres
LKFCP3- Concentric tube with bare inner electrode for non-conducting liquids such as
oil etc., Max Length = 3 metres
LKFCP4- Concentric tube with insulated electrode for conducting liquids with inner electrode insulated. Max length = 3 metres
LKFCP201- Insulated cable electrode and weight for conducting liquids. Max length 10 metres
The Electrodes
Electrodes are supplied to specified length, which must not be altered without reference to Landon Kingsway.
Electrode has been carefully packed. If damage is discovered please report it to us right away. Handle the electrode with care paying particular attention not to damage the plastic sheath of insulated electrodes. Do not bend.
A stainless steel bracket is available to mount the electrode onto a flat surface. See Drawing No. 2657.
In turbulent conditions a metal bracket connected to earth may be used to steady the electrode (see drawing no. 2657). Alternatively, we can supply a plastic still well.
LK 371A with 4 volt free relays for pump control/alarms
230vac/24vdc Supply 1 x 4-20mA output
Digital Display
Analogue Display
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| Capacitance Probes |
The Probe in the system represents a capacitor and the small change in its capacitance with varying level is used to produce a milliamp output, which is proportional to level. This is registered in the ‘LK371’ control unit.
A capacitor consists of two metal plates insulated from each other and spaced apart.
The insulating material between the plates is called the dielectric, even if this is just air or vacuum.
The electrical capacitance C of a capacitor is the amount of electric charge it can store and this depends on three factors.
The value of the Dielectric Constant K of the insulation
between plates.
The area of the plates A
The distances between the plates d
And the relationship is expressed by C=K A/d.
The greater the value of K and A, the greater the capacitance.
The greater the value of d the smaller the capacitance.
For accurate and stable results, the greatest capacitance change possible is required.
Non electrically conducting products such as oil, diesel fuel, hydrocarbon etc., rely on the dielectric constant, and the higher the value of K, the greater the capacitance change.
Electrically conducting products such as water and many acids rely on the area of the plates. To prevent the capacitor plates being short-circuited, a fully insulated electrode must be used.
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| Technical Specification |
Concentric tube electrode in 316 Stainless Steel 25mm Boss 1mtr
Concentric tube electrode in 316 Stainless Steel 25mm Boss 2mtr
Concentric tube electrode in 316 Stainless Steel 25mm Boss 3mtr
Concentric tube electrode in 316 Stainless Steel 25mm Boss 4mtr |
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