Omega Vehicle Security LVP-51 Series - Manual (Page 6)

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SAFETY PRECAUTION (capacitance) Step Three
Make a Fail‐Safe System: Design a fail‐safe system that accommodates the possibility of switch and/or power
failure. OMEGA ENGINEERING recommends the use of redundant backup systems and alarms in addition to
the primary system. Adding a redundant high level float switch to the system is a cost effective means to
prevent costly tank overflows.
The LVP‐51‐R switch has a single relay. The normally open (NO) or normally closed (NC) operation is user
selected based on the desired system control. Always design a fail‐safe system that accommodates for the
possibility of functional and/or power failure to the instrument. The "normal" relay state is where the relay
coil is de‐energized and the relay indicator is OFF. Therefore, if power is cut OFF to the switch it will de‐
energize the relay. Make sure that the de‐energized state is the safe state in your system design. As such, if
switch power is lost, a pump will turn OFF if it is connected to the normally open side of the relay.
Technology: The non‐intrusive RF capacitance switch detects the presence of liquid or air by measuring the
conductive or dielectric values which are present in all materials. An electrical capacitor is formed between
the level switch and the outer tank wall. As liquid rises and falls against the inner wall, the capacitance effect is
greatly increased and the 60VA SPST relay changes state.
The sensor’s operation may vary based on the dielectric properties of various application liquids. Liquids
with a dielectric constant less than 20 may not be detected by an LVP‐51‐R sensor.
Table of Common Dielectric Constants: NOTE: Liquids with a conductivity value > 100 µS/cm are fine if
coating is not an issue. Liquids with a dielectric constant less than 20 will not be detected by an LVP‐51‐R level
switch, depending on conditions.
Acetone ..................... 21
Acetoaldehyde ....... 22.2
Acetyl methyl hexyl
ketone ........................ 28
Alcohol ........... 16 to 31
Ammonia ........ 15 to 25
Acetic acid .... 4.1 to 6.2
Butyl chloride .......... 9.6
Barium chloride 9 to 11
Benzene ................... 2.3
Benzine .................... 2.3
Barium nitrate .......... 5.6
Bromine ................... 3.1
Chlorobenzene . 4.7 to 6
Chlorotoluene .......... 4.7
Chloroform .... 4.5 to 5.0
Chlorine, liquid ....... 2.0
Carbon tetrachloride 2.2
Cyan ........................ 2.6
Cyclohexane methanol
.................................. 3.7
D.I. Water ................. 20
Ethyl toluene ........... 2.2
Ethyl alcohol ............ 23
Ethylene glycol ........ 37
Ethylene oxide .......... 14
Ethylene dichloride
.......................... 11 to 17
Ethylene chloride .. 10.5
Ethyl acetate ............ 6.4
Ethyl salicylate ........ 8.6
Ethyl stearate .......... 2.9
Ethyl silicote ........... 4.1
Formic acid .............. 59
Ferric oleate ............ 2.6
Freon ....................... 2.2
Glycerine .................. 47
Glycol ....................... 30
Glycol nitrite ............ 27
Gasoline ........... 2 to 2.2
Hydrochloric acid ... 4.6
Isobutyric acid ........ 2.7
Isobutyl methyl ketone
................................... 13
Jet fuel ..................... 1.7
Lead carbonate ......... 18
Lead nitrate ............... 38
Methyl salicylate ..... 9.0
Methanol ................... 33
Methyl alcohol . 33 to 38
Margarine, liquid
........................2.8 to 3.2
Methyl acetate ......... 7.3
N-butyl formate ....... 2.4
Nitrobenzene ... 26 to 35
Nitrotoluene ............. 25
Naphthalene .. 2.3 to 2.5
Oils, vegetable 2.5 to 3.5
Oils, mineral .. 2.3 to 2.4
Oils, petroleum
........................ 1.8 to 2.2
Oleic acid ................ 2.5
Propane, liquid
........................ 1.8 to 1.9
Potassium nitrate
........................ 5.0 to 5.9
Potassium chloride .. 5.0
Stearic acid .............. 2.3
Toluene .................... 2.4
Trichloroethylene .... 3.4
Trichloroacetic acid 4.5
Terephthalic acid
........................ 1.5 to 1.7
Thinner .................... 3.7
Urea ......................... 3.5
Vinyl chloride .. 2.8 to 6
Vinyl alcohol 1.8 to 2.0
Water, 20°C ............. 80
Water, 100°C ........... 48
Components: The LVP‐51‐R is offered in three different models. Depending on the model purchased, you may
or may not have been shipped all the components shown below.
 LVP‐51‐R
o LVP‐51‐R – PSO body with PP cable
 Quick Start Guide